CN111726191A - Signal processing method, signal processing device and computer readable storage medium - Google Patents
Signal processing method, signal processing device and computer readable storage medium Download PDFInfo
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Abstract
The embodiment of the application discloses a signal processing method, a signal processing device and a computer readable storage medium, wherein the method comprises at least one of the following steps: the sending end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine a signal transmission parameter and/or send a signal; the sending end sends at least one of the security level index and the security level parameter information to the receiving end to determine a signal sending parameter and/or sends a signal; and the transmitting end determines the transmitting signal parameters according to at least one of the security level index, the security level parameter information and the channel information and/or transmits signals. The determined transmission signal power leakage is minimized; interference signals are concentrated in an angle area with higher signal leakage power, and interference of adjacent areas is avoided; and random interference of multiple dimensions is transmitted in a signal leakage area to resist the existence of multi-eavesdropping, so that the security threat of a multi-eavesdropper on a wireless system is effectively reduced.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a signal processing method and apparatus, and a computer-readable storage medium.
Background
In a wireless communication system, due to the openness and broadcast of a wireless channel, physical layer security has become a weak link for security maintenance of the wireless communication system. Meanwhile, most of the traditional security technologies are based on the cryptology theory, and the problems of low key distribution rate, long system delay and the like when a large number of users are faced exist. With the frequent eavesdropping of events in recent years, how to maintain the physical layer security has become an important research direction.
In a wireless system such as LTE (Long Term Evolution) which is currently in use, a base station is equipped with multiple antennas, and a beam forming technique is adopted in a downlink direction in which the base station communicates with a device. For multi-antenna systems, the academia has proposed signal transmission methods for eavesdroppers using beamforming, including artificial interference techniques.
The artificial interference technology is that in a multi-antenna system, random interference signals which are orthogonal to secret signals in space and do not contain useful information are designed, and the secret signals are transmitted at the same time in the same frequency, so that potential eavesdroppers are interfered, interference on a legal receiver is avoided, and the channel advantage of a legal receiving end is established to improve the achievable safety rate of the system. The jamming technique is one of effective methods for maintaining security of a wireless physical layer in case of eavesdropper channel information.
However, the current multi-antenna secure transmission technology based on artificial interference still has the following problems:
1. most researches only consider the condition of a single eavesdropper, the number of the eavesdroppers is uncertain in the practical problem, and a plurality of eavesdroppers can also carry out cooperative eavesdropping so as to improve the eavesdropping effect;
2. the main lobe of the traditional secret signal adopts a maximum ratio combining and transmitting scheme, the distribution of the main lobe signal in the direction of a non-receiver is not limited, and the problem of main lobe signal leakage exists;
3. under the condition that a large-scale multi-antenna system faces practical deployment, research aiming at design and method in the large-scale multi-antenna system is insufficient at present.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a signal processing method, a signal processing apparatus, and a computer-readable storage medium, so as to solve the problem of low security capacity when there are multiple eavesdroppers in a multi-antenna system in the conventional jamming technology.
The technical scheme adopted by the embodiment of the application for solving the technical problems is as follows:
according to an aspect of the embodiments of the present application, there is provided a signal processing method, the method including:
the sending end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine a signal transmission parameter and/or send a signal;
the sending end sends at least one of the security level index and the security level parameter information to the receiving end to determine a signal sending parameter and/or sends a signal;
and the transmitting end determines the transmitting signal parameters according to at least one of the security level index, the security level parameter information and the channel information and/or transmits signals.
According to another aspect of the embodiments of the present application, there is provided a signal processing apparatus, which includes a memory, a processor, and a signal processing program stored in the memory and executable on the processor, and when executed by the processor, the signal processing program implements the steps of the signal processing method described above.
According to another aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored thereon a signal processing program, which when executed by a processor, implements the steps of the signal processing method described above.
The signal processing method, the signal processing device and the computer readable storage medium of the embodiment of the application perform signal transmission by determining the transmission signal parameters and utilizing the determined transmission signal parameters; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in the angle area with higher signal leakage power, and the adjacent cell interference caused by omnidirectional occurrence is avoided; and random interference of multiple dimensions is transmitted in a signal leakage area to resist the existence of multi-eavesdropping, so that the security threat of a multi-eavesdropper on a wireless system is effectively reduced.
Drawings
Fig. 1 is a schematic flow chart of a signal processing method according to an embodiment of the present application;
fig. 2 is a schematic diagram of directional structures of a first beamforming vector and a second beamforming vector according to an embodiment of the present application;
fig. 3 is a schematic diagram showing the influence of the number of independent interferers on the system capacity under different numbers of eavesdroppers in the case that the eavesdroppers process the received signals independently;
FIG. 4 is a diagram illustrating the effect of the number of eavesdroppers on the security capacity of the system under different numbers of interferences in the case where the eavesdroppers process the received signals together;
FIG. 5 is a schematic diagram of the convergence rate of the algorithm for calculating the second beamforming parameter;
fig. 6 is a schematic structural diagram of a signal processing apparatus according to an embodiment of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer and clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Example 1:
as shown in fig. 1, an embodiment of the present application provides a signal processing method, where the method includes:
step S11, the sending end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine the parameters of the transmitted signal, and/or sends the signal;
step S12, the sending end sends at least one of the security level index and the security level parameter information to the receiving end to determine the signal sending parameter, and/or sends the signal;
step S13, the sending end determines the parameters of the transmitted signal according to at least one of the security level index, the security level parameter information, and the channel information, and/or sends the signal.
In one embodiment, the transmission signal parameters include at least one of:
the size of the range of the emission interference angle, the number of interference beam forming vectors and the number of antennas required by emission.
In an embodiment, the determining, by the sending end, a transmission signal parameter by receiving at least one of a security level index, security level parameter information, and channel information fed back by a receiving end includes at least one of:
the sending end selects t security level indexes from the information fed back by the receiving end to determine the parameters of the transmitted signals;
the transmitting end determines transmitting signal parameters according to the security level indexes fed back by the plurality of receiving ends;
wherein t is a positive integer greater than or equal to 1.
In one embodiment, the method for determining the transmission signal parameter by the transmitting end selects a security level index from the information fed back by the receiving end, and includes at least one of the following steps:
the receiving end transmits N security level indexes to the transmitting end; the sending end selects t security level indexes from the N security level indexes fed back by the receiving end; wherein N is a positive integer greater than or equal to 1, t is a positive integer greater than or equal to 1, and t < ═ N.
In an embodiment, after the sending end receives at least one of the security level index, the security level parameter information, and the channel information fed back by the receiving end, the method further includes:
under the condition that the security level index fed back by the receiving end does not have the level index supported by the sending end, feeding back service termination information to the receiving end; or sending or feeding back parameters corresponding to the security level close to the security level of the receiving end to determine and send the transmission signal; and/or, notifying a current security level index to the receiving end; or determining the transmitting signal according to the parameter corresponding to the default security level and transmitting the transmitting signal.
In one embodiment, the determining, by the sending end, the parameters of the transmitted signal according to the security level indexes fed back by the multiple receiving ends includes at least one of:
the sending end transmits the grade index vectors to the plurality of receiving ends;
and the sending end receives the required grade index information fed back by the plurality of receiving ends, and selects one or more receiving ends and/or the safety grade index corresponding to the receiving ends.
In one embodiment, the receiving, by the sending end, required level index information fed back by the multiple receiving ends, and then further includes:
under the condition that the resources of the transmitting terminal are saturated, the transmitting terminal feeds back service termination information to the plurality of receiving terminals; or,
and only the part serving a plurality of receiving ends transmits signals based on the safety level information fed back by the receiving ends and/or the supportable safety level capability of the transmitting ends.
In one embodiment, the sending end sends at least one of a security level index and security level parameter information to the receiving end to determine a transmission signal parameter, and the sending end includes at least one of:
the receiving end feeds back channel information obtained through channel estimation to the transmitting end;
the receiving end feeds back one or more grade indexes selected based on the current service type to the transmitting end;
and the receiving end feeds back required grade index information determined based on the current service type to the transmitting end.
In one embodiment, the receiving end feeds back to the transmitting end one or more rank indexes selected based on the current traffic type, including at least one of:
the transmitting terminal transmits N level index vectors to the receiving terminal;
and the receiving end selects one or more grade indexes in the N grade index vectors according to the service types, wherein N is a positive integer greater than or equal to 1.
In one embodiment, the method further comprises:
under the condition that the grade index required by the service type does not exist in the N grade index vectors, the receiving end feeds back service termination information to the transmitting end; or sending or feeding back parameters corresponding to the security level close to the security level of the receiving end to determine and send the transmission signal; and/or, notifying a current security level index to the receiving end; or determining the transmitting signal according to the parameter corresponding to the default security level and transmitting the transmitting signal.
To better illustrate the inventive concepts of the present application, the following description is made in conjunction with single-user, multi-user, and so on:
example 2:
the embodiment of the present application provides a signal processing method, and under the condition of a single user, the method includes:
the transmitting end and the receiving end are preset with the same security level parameter table, and the security level parameter table comprises a level index and a signal processing parameter.
The level index is used for representing and searching values of a group of signal processing parameters; the signal processing parameters at least comprise the size of the transmission interference angle range, the number of interference beam forming vectors, the number of antennas required for transmission and the like.
Specifically, the value of the size of the transmission interference angle range is recorded as Δ, the value of the number of interference beam forming vectors is recorded as M, the value of the number of antennas required for transmission is recorded as N, and the values of a group of signal processing parameters need to satisfy:
where Δ θ is the angular sampling interval.
It should be noted that, the size of the transmission interference angle range is used to determine the angle range of the transmission interference; the number of the interference beam forming vectors is used for determining the interference dimension, and the increase of the interference dimension can improve the achievable safety rate of the system under the condition that multiple eavesdroppers exist.
Particularly, values of the size of the emission interference angle range and the number of interference beam forming vectors may include zero; the size of the transmission interference angle range and the number of interference beam forming vectors are zero or partially zero, which represents the situation that only the transmission signal does not transmit interference.
The transmitting end transmits at least one of: 1) a signal containing reference information and rank index vector information determined based on own antenna configuration; 2) and only signals containing the grade index vector information determined based on the self antenna configuration and downlink pilot signals.
The self antenna configuration of the transmitting terminal at least comprises the number of antennas; the transmitting terminal judges whether each level index in the security level parameter list is supported or not based on the number of the antennas of the transmitting terminal; the level index vector is composed of all level indexes supported by the transmitting end.
Specifically, under the condition of a single user, if the number of antennas at the transmitting end is greater than or equal to the value of the number of antennas required for transmission in the signal processing parameters represented by one level index, the transmitting end supports the level index.
The receiving end receives the signal transmitted by the transmitting end, and the receiving end comprises at least one of the following components: 1) a signal including reference information and rank index vector information determined by a transmitting end based on an antenna configuration; 2) only signals of grade index vector information determined by the transmitting terminal based on the antenna configuration and downlink pilot signals are included.
The receiving end feeds back downlink channel information obtained through channel estimation and a grade index selected based on the current service type to the transmitting end; and when the grade index vector does not have the grade index meeting the current service type requirement of the receiving end, the receiving end feeds back service termination information to the transmitting end.
The downlink channel information comprises a downlink channel gain vector obtained by a receiving end after receiving a downlink pilot signal transmitted by the transmitting end and performing channel estimation, and an azimuth angle range where the receiving end is located; and recording the azimuth angle range of the receiving end as a first angle range.
In this embodiment, the level index selected by the receiving end is a level index in a level index vector provided by the receiving end according to the current service type, and is fed back to the transmitting end.
And the transmitting end receives the downlink channel information fed back by the receiving end and the selected one grade index and determines the signal processing parameters according to the selected one grade index of the receiving end.
Specifically, the transmitting end determines a signal processing parameter according to a level index selected by the receiving end, that is, the values of the size of the transmission interference angle range corresponding to the level index, the number of interference beam forming vectors, and the like are determined by searching a security level parameter table.
And the transmitting terminal calculates and obtains a first beam forming parameter and a second beam forming parameter according to the signal processing parameter and the downlink channel information.
In this embodiment, the transmitting end calculates a first beamforming parameter according to the downlink channel information.
Specifically, a first beam forming parameter is calculated according to a linear constraint minimization variance criterion, wherein the total power of signals in a second angle range is minimized by taking the fact that the power of signals received by a receiving end is greater than or equal to a first power threshold as linear constraint; the first beamforming parameter is an optimal beamforming vector under a linear constraint minimization of variance criterion.
Wherein, the first power threshold is a receiving power threshold determined according to the QoS requirement of a receiving end; the second angular range is an angular range of signal leakage, obtained by removing the first angular range from the set of angles [0, π ].
Specifically, the first beam parameter is obtained by the following calculation: calculating a numerical integral
Calculating the first beamforming vector
Wherein, wbA first beamforming parameter; a (theta) is a guide vector of the form of [1, e ]-jπcos(θ),...,e-jπ(N-1)cos(θ)](ii) a Ω is a second angular range; h isbIs a first channel parameter; gamma rayBIs a first power threshold.
In this embodiment, the calculating, by the transmitting end, the second beamforming parameter according to the signal processing parameter may include all or one of the following cases:
the first condition is as follows: when the values of the transmission interference angle range and the number of the interference beam forming vectors contained in the signal processing parameters are zero or both zero, the second beam forming parameter is set to be zero, namely, only signals are transmitted;
case two: when the values of the transmission interference angle range and the number of interference beam forming vectors contained in the signal processing parameter are not zero, calculating a second beam forming parameter, specifically:
and the transmitting end determines the angle range of the transmission interference according to the size of the angle range of the transmission interference in the signal processing parameters, and records the angle range of the transmission interference as a third angle range.
Specifically, let the first angular range be [ θ ]l,θh]The magnitude of the transmission interference angle range is Δ, from which it follows that the third angle range can be expressed as [ θ [ ]l-Δ/2,θh+Δ/2]。
It should be noted that, the leakage power of the signal decreases with the deviation from the first angle range, so that the interference is transmitted only in the area with larger signal leakage power at the two sides of the first angle range, i.e. the third angle range, instead of the omni-directional transmission, thereby reducing the interference to the simultaneous frequency users and ensuring a certain multiplexing capability.
And recording the number of interference beam forming vectors in the signal processing parameters as M, and dividing a third angle range into M angle intervals.
Specifically, in the M angle intervals, any two angle intervals are not intersected with each other, and a set of all the angle intervals is a third angle range, which can be represented as follows:
ΩAN,i∩ΩAN,j,i1j,i,j＝1,2,...,M
wherein, M angle intervals are respectively omegaAN,j,j＝1,2,...,M。
In particular, for convenience of description, the jth angle section Ω will be excluded in the third angle rangeAN,jThe angular range of the latter is noted
Can be expressed as:
in this embodiment, the calculating M interference beamforming vectors included in the second beamforming parameter includes:
taking the jth interference beam forming vector as an example, the following conditions should be satisfied:
the first condition is as follows: the maximum value of the signal leakage power to interference power ratio in the third angular range is minimized.
Specifically, for any angle θ belonging to the third angle range, the ratio of the signal leakage power to the interference power can be expressed as
The minimum maximum problem can be expressed as
And a second condition: and the jth interference beam forming vector has no interference to the receiving end, namely the interference power received by the receiving end is ensured to be less than or equal to a second power threshold.
Specifically, the interference power received by the receiving end can be expressed asIn order to satisfy that the jth interference beam forming vector does not interfere with the receiving end, that is, to ensure that the interference power received by the receiving end is less than or equal to the second power threshold, the following formula is obtained:
wherein, wa,jJ is 1, 2.. M is the jth interference beam forming vector, hbH is a second power threshold, preferably zero, for the first channel parameter. In this embodiment, the second power threshold is chosen to be zero, i.e. the constraint may be expressed as
And (3) carrying out a third condition: the j interference beam forming vector ensures that the interference power of each angle in the j angle interval is greater than the average interference power of other angle intervals, and comprises the following steps:
specifically, the interference power of each angle in the jth angle interval can be expressed as
The average interference power of other angle intervals can be expressed as
Wherein the other angle interval is to eliminate the jth angle interval omega from the third angle rangeAN,jThe angular range of the latter, i.e.
In order to satisfy that the interference power of each angle in the jth angle interval is greater than the average interference power of other angle intervals, the following power inequality constraint is satisfied:
in particular, the corresponding angle interval ΩAN,jThe power of each angle is more than or equal to other emission interference angles
T (T is more than or equal to 1) times of the average power, and the following formula is obtained:
in this embodiment, T is taken as M-1.
And a fourth condition: the total power of the first beam forming parameter and the second beam forming parameter should be less than or equal to a third power threshold, that is, the following inequality constraint is satisfied:
wherein the power of the first beamforming parameter is | | wb||2(ii) a The second beam forming parameter has a power of
PtIs a third power threshold.
In this embodiment, the M interference beamforming vectors in the second beamforming parameter have the same interference power, and the inequality constraint may be expressed as:
in addition, w isa,jUnder the condition of meeting the requirement of covering enough interference power in the corresponding angle interval, the w is ensured in the third angle rangea,jIn that
There is a certain power distribution. The second beamforming parameters, i.e., the M interference beamforming vectors, have M-dimensional random interference at each angle within the third angular range.
Specifically, the jth interference beamforming vector is solved, that is:
introducing a relaxation variable l and at omegaAN、ΩAN,jThe interval is uniformly sampled at the sampling interval by taking delta theta as an angle, and the number of sampling points is Lj、NjThe above problems are translated into:
wherein,
the optimization problem is solved by using an Internal Convex Approximation (ICA) iteration method according to a first-order convex condition
Converting the non-convex strip into a convex condition:
wherein R is a real part, wa,j,l-1The result of step l-1. Substituting the formula into the optimization problem to obtain the convex problem of the iteration of the step l-1:
θp∈ΩAN,j,p＝1,2,...,Nj
θi∈ΩAN,i＝1,2,...,Lj
in the l +1 th iteration, wa,j,l-1Updated as the result w of the iteration of the first stepa,j。
Substituting the initial value into the internal convex approximation method to carry out iterative solution until the result is converged or the maximum iteration number is reached, and obtaining the jth interference beam forming vector wa,j。
And respectively calculating M interference beam forming vectors by adopting an internal convex approximation iteration method to obtain a second beam forming parameter.
And the transmitting terminal processes the signal to be transmitted by adopting the first and second beam forming parameters to obtain a processed transmitting signal.
In the scheme, the first beam forming parameter performs weighting processing on a transmission signal to obtain a first weighted signal; the transmitting terminal generates M groups of random sequences, and the M groups of random sequences are weighted respectively by using M interference beam forming vectors contained in the second beam forming parameters to obtain second weighted signals; and superposing the first weighted signal and the second weighted signal to obtain a processed transmitting signal.
Specifically, the processed transmission signal can be expressed as:
wherein x is the processed transmission signal; w is abFor the first beam-forming parameter(s),
is wbThe conjugate vector of (a); w is aa,jJ is 1, 2.. M is M interference beamforming vectors constituting the second beamforming parameters,
is wa,jThe conjugate vector of (a); n isa,jJ is 1, 2.
Example 3:
the embodiment of the present application provides a signal processing method, and under the condition of a single user, the method includes:
the transmitting end and the receiving end are preset with the same security level parameter table, and the security level parameter table comprises a level index and a signal processing parameter.
The level index is used for representing and searching values of a group of signal processing parameters; the signal processing parameters at least comprise the size of the transmission interference angle range, the number of interference beam forming vectors, the number of antennas required for transmission and the like.
The receiving end determines and sends the required grade index information to the transmitting end based on the current service type.
Wherein, the required grade index information at least comprises one or more grade indexes meeting the current service requirement; when a plurality of level indexes are included, the plurality of level indexes may be arranged in a corresponding priority order, or priorities corresponding to the plurality of level indexes may be included in the level index information.
The transmitting end receives the grade index information required by the receiving end, selects a grade index based on the antenna configuration of the transmitting end, and transmits signals to the receiving end, wherein the grade index comprises at least one of the following components: 1) a signal containing a level index information and a reference information selected by the transmitting terminal; 2) a downlink pilot signal. And under the condition of not supporting the grade index, feeding back service termination information to the receiving end.
Specifically, the selecting, by the transmitting end, the rank index based on the antenna configuration of the transmitting end includes: the transmitting terminal judges whether one or more grade indexes contained in the grade index information required by the receiving terminal are supported; then, among the supported level indexes, one having the highest priority is selected.
In the case of a single user, the transmitting end supporting a certain level index means that the number of antennas of the transmitting end is greater than or equal to the value of the number of antennas required for transmission in the signal processing parameters represented by the level index.
In particular, in case of not supporting the rank index, service termination information is fed back to the receiving end. After receiving the service termination information, the receiving end can make a request to other transmitting ends.
The receiving end receives the signal transmitted by the transmitting end, and the receiving end comprises at least one of the following components: 1) a signal containing a level index information and a reference information selected by the transmitting terminal; 2) a downlink pilot signal.
The receiving end feeds back downlink channel information obtained through channel estimation to the transmitting end.
The downlink channel information includes a downlink channel gain vector and an azimuth angle range of the receiving end.
And the transmitting end receives the downlink channel information fed back by the receiving end and determines a signal processing parameter according to the selected one grade index.
Specifically, the transmitting end determines a signal processing parameter according to the selected level index, that is, the values of the size of the transmission interference angle range corresponding to the level index, the number of interference beam forming vectors, and the like are determined by searching the security level parameter table.
And the transmitting terminal calculates and obtains a first beam forming parameter and a second beam forming parameter according to the signal processing parameter and the downlink channel information. Specifically, as shown in the first embodiment.
And the transmitting terminal processes the signal to be transmitted by adopting the first and second beam forming parameters to obtain a processed transmitting signal. Specifically, as shown in the first embodiment.
Example 4:
the embodiment of the present application provides a signal processing method, and under the condition of a single user, the method includes:
the receiving end determines the transmission parameter information according to the current service type and transmits the required transmission parameter information to the transmitting end.
Wherein the transmission parameter information at least comprises one or more groups of transmission parameters; the transmission parameters at least comprise the size of the transmission interference angle range, the number of interference beam forming vectors, the number of antennas required for transmission and the like. When multiple sets of transmission parameters are included, the transmission parameters may be arranged according to the priority order of the transmission parameters, or the transmission parameter information includes the priority corresponding to the transmission parameters.
The transmitting terminal receives the information of the transmitting parameters needed by the receiving terminal, selects a group of transmitting parameters based on the antenna configuration of the transmitting terminal and transmits signals to the receiving terminal, wherein the transmitting terminal comprises at least one of the following components: 1) a signal containing a set of transmission parameter information and reference information selected by the transmitting end; 2) a downlink pilot signal.
And the receiving end feeds back service termination information to the receiving end under the condition of no supporting transmission parameters.
Specifically, the selecting, by the transmitting end, a set of transmission parameters based on the antenna configuration of the transmitting end includes: the transmitting terminal judges whether one or more groups of transmitting parameters contained in the transmitting parameter information are supported; then, among the one or more sets of supported transmission parameters, the set of transmission parameters with the highest priority is selected.
In the case of a single user, the fact that the transmitting end supports a certain group of transmission parameters means that the number of antennas of the transmitting end is greater than or equal to the value of the number of antennas required for transmission included in the group of transmission parameters.
In particular, service termination information is fed back to the receiving end without supporting transmission parameters. After the receiving end receives the service termination information, it can request communication from other transmitting ends.
The receiving end receives the signal transmitted by the transmitting end, and the receiving end comprises at least one of the following components: 1) a signal containing a set of transmission parameter information and reference information selected by the transmitting end; 2) a downlink pilot signal.
The receiving end feeds back downlink channel information obtained through channel estimation to the transmitting end.
The downlink channel information at least includes a downlink channel gain vector, an azimuth angle range of the receiving end, and the like.
And the transmitting end receives the downlink channel information fed back by the receiving end, and calculates and obtains a first beam forming parameter and a second beam forming parameter according to the downlink channel information and the transmitting parameters required by the receiving end. Specifically, as shown in the first embodiment.
And the transmitting terminal processes the signal to be transmitted by adopting the first and second beam forming parameters to obtain a processed transmitting signal. Specifically, as shown in the first embodiment.
Example 5:
the embodiment of the present application provides a signal processing method, and under the condition of a single user, the method includes:
the transmitting end transmits at least one of: 1) a signal including reference information and self antenna configuration information; 2) only signals containing self antenna configuration information and downlink pilot signals.
The self antenna configuration information at least includes the number of antennas at the transmitting end, and the like.
The receiving end receives the signal transmitted by the transmitting end, and the receiving end comprises at least one of the following components: 1) a signal comprising reference information and transmitting end antenna configuration information; 2) only signals containing the antenna configuration information of the transmitting terminal and downlink pilot signals.
And the receiving end determines a group of required transmitting parameters according to the transmitting end antenna configuration information and the current service type, and feeds back the group of transmitting parameters and downlink channel information obtained through channel estimation to the transmitting end.
The transmitting parameters at least comprise the size of a transmitting interference angle range, the number of interference beam forming vectors and the like; the downlink channel information at least comprises a downlink channel gain vector, an azimuth angle range of the receiving end and the like.
The transmitting end receives the downlink channel information fed back by the receiving end and the transmitting parameters required by the receiving end, and calculates and obtains a first beam forming parameter and a second beam forming parameter. Specifically, as shown in the first embodiment.
And the transmitting terminal processes the signal to be transmitted by adopting the first and second beam forming parameters to obtain a processed transmitting signal. Specifically, as shown in the first embodiment.
Example 6:
the embodiment of the application provides a signal processing method, and under the condition of multiple users, the method comprises the following steps:
the transmitting end and the receiving ends are preset with the same safety level parameter table, and the safety level parameter table comprises a level index and a signal processing parameter.
The level index is used for representing and searching values of a group of signal processing parameters; the signal processing parameters at least comprise the size of the transmission interference angle range, the number of interference beam forming vectors, the number of antennas required for transmission and the like.
The transmitting end transmits at least one of: 1) a signal containing reference information and rank index vector information determined based on own antenna configuration; 2) and only signals containing the grade index vector information determined based on the self antenna configuration and downlink pilot signals.
The self antenna configuration of the transmitting terminal at least comprises the number of antennas; the transmitting terminal judges whether each level index in the security level parameter list is supported or not based on the number of the antennas of the transmitting terminal; the level index vector is composed of all level indexes supported by the transmitting end.
A plurality of receiving terminals receive the signals transmitted by the transmitting terminal, and the receiving terminals include at least one of the following: 1) a signal including reference information and rank index vector information determined based on a transmitting-end antenna configuration; 2) and only signals containing rank index vector information determined based on the antenna configuration at the transmitting end and downlink pilot signals.
And the plurality of receiving ends feed back downlink channel information obtained through channel estimation and required grade index information determined based on current service type selection to the transmitting end.
Wherein, the downlink channel information at least comprises a downlink channel gain vector, an azimuth angle range of the receiving end and the like; the grade index information at least comprises one or more grade indexes in a grade index vector provided by a selective transmitting terminal according to the current service type. When a plurality of level indexes are included, the plurality of level indexes may be arranged in a corresponding priority order, or priorities corresponding to the plurality of level indexes may be included in the level index information.
It should be noted here that one or more level indexes determined by multiple users according to respective current service types may be identical, partially identical, or completely different.
The transmitting end receives the downlink channel information fed back by the receiving ends and the required grade index information, and selects the accessible receiving end and a corresponding grade index.
It should be noted that, in the case of multiple users, the transmitting end needs to jointly schedule multiple receiving ends, select an accessible receiving end and a corresponding rank index.
Specifically, the transmitting end selects a plurality of receiving ends using different spatial domain resources as the accessible receiving end according to the downlink channel information fed back by the plurality of receiving ends and the required level index information. Wherein, the accessible receiving ends using different airspace resources all need to satisfy: for an accessible receiving end, one or more level indexes exist in the required level index information determined by the receiving end, and the transmitting parameters represented by the level indexes and the azimuth angle range of the receiving end meet the condition that the azimuth angle range of the receiving end is not overlapped with the azimuth angle ranges of other receiving ends; the angular range of the transmission interference of the receiving end is not overlapped with the azimuth angle range of other receiving ends. For an accessible receiving end, if a plurality of level indexes satisfying the above condition exist in the required level index information determined by the receiving end, one of the level indexes having the highest priority is selected.
For multiple accessible receiving ends using different spatial domain resources, identical, partially identical, or completely different time, frequency, or code domain resources may be used.
In addition, for users occupying the same spatial domain resource, the transmitting end may reallocate part of the same or completely different time domain, frequency domain or code domain resources, and the following embodiments are as described in example five. Under the condition that the resources of a transmitting terminal are saturated, the transmitting terminal feeds back service termination information to a receiving terminal; the receiving end can request communication from other transmitting ends after receiving the service termination information.
And the transmitting terminal determines signal processing parameters according to the corresponding grade indexes of the access receiving terminals respectively, and calculates and obtains first beam forming parameters and second beam forming parameters of the access receiving terminals according to the signal processing parameters and the downlink channel information. Specifically, as shown in the first embodiment.
And the transmitting terminal processes the signal to be transmitted by adopting the first and second beam forming parameters to obtain a processed transmitting signal. Specifically, as shown in the first embodiment.
Example 7:
the embodiment of the application provides a signal processing method, and under the condition of multiple users, the method comprises the following steps:
the transmitting end transmits at least one of: 1) a signal including reference information and self antenna configuration information; 2) only signals containing self antenna configuration information and downlink pilot signals.
Wherein, the self antenna configuration information of the transmitting terminal at least comprises the number of antennas.
A plurality of receiving terminals receive the signals transmitted by the transmitting terminal, and the receiving terminals include at least one of the following: 1) a signal comprising reference information and transmitting end antenna configuration information; 2) only signals containing the antenna configuration information of the transmitting terminal and downlink pilot signals.
And the plurality of receiving ends feed back downlink channel information obtained by the receiving ends through channel estimation and required transmitting parameter information determined based on current service type selection to the transmitting end.
Wherein, the downlink channel information at least comprises a downlink channel gain vector and an azimuth angle range of the receiving end; the transmission parameter information is as shown in example three.
It should be noted that one or more sets of transmission parameters determined by multiple users according to respective current service types may be identical, partially identical or completely different.
The transmitting end receives the downlink channel information fed back by the receiving ends and the required transmitting parameter information, and selects the accessible receiving end and a corresponding group of transmitting parameters.
It should be noted that, in the case of multiple users, the transmitting end needs to jointly schedule multiple receiving ends, select an accessible receiving end and a corresponding set of transmission parameters.
Specifically, the transmitting end selects a plurality of receiving ends using different spatial domain resources as the accessible receiving end according to the downlink channel information fed back by the plurality of receiving ends and the required transmission parameter information. Wherein, the accessible receiving ends using different airspace resources all need to satisfy: for an accessible receiving end, one or more groups of transmitting parameters exist in the required transmitting parameter information determined by the receiving end, and the azimuth angle range of the transmitting parameters and the receiving end meets the condition that the azimuth angle range of the receiving end is not overlapped with the azimuth angle ranges of other receiving ends; the angular range of the transmission interference of the receiving end is not overlapped with the azimuth angle range of other receiving ends. For an accessible receiving end, if multiple groups of transmission parameters meeting the above conditions exist in the required transmission parameter information determined by the receiving end, one group of multiple groups of transmission parameters with the highest priority is selected.
For multiple accessible receiving ends using different spatial domain resources, identical, partially identical, or completely different time, frequency, or code domain resources may be used.
In addition, for users occupying the same spatial domain resource, the transmitting end may reallocate part of the same or completely different time domain, frequency domain or code domain resources, and the following implementation is as described in example six. Under the condition that the resources of a transmitting terminal are saturated, the transmitting terminal feeds back service termination information to a receiving terminal; the receiving end can request communication from other transmitting ends after receiving the service termination information.
And the transmitting terminal calculates and obtains a first beam forming parameter and a second beam forming parameter of each access receiving terminal according to a group of transmitting parameters corresponding to each access receiving terminal and the downlink channel information. Specifically, as shown in the first embodiment.
And the transmitting terminal processes the signal to be transmitted by adopting the first and second beam forming parameters to obtain a processed transmitting signal. Specifically, as shown in the first embodiment.
Example 8:
in embodiments 2 to 5, in the case of a single user, the manner of obtaining the size of the angle range of the transmission interference, the number of interference beam forming vectors, and the like includes one of the following: 1) determining according to feedback information of a receiving end; 2) the transmitting terminal is self-configured. When the transmitting end configures the parameters by itself, the angle range which needs to meet the transmitting interference and the azimuth angle range of the receiving end do not overlap with each other.
Example 9
In embodiments 6 to 7, in the case of multiple users, the manners of obtaining the size of the angle range of the transmission interference, the number of interference beam forming vectors, and the like include one of the following: 1) determining according to feedback information of a receiving end; 2) the transmitting terminal is self-configured. When the transmitting end configures the parameters by itself, it is required to satisfy that the angle range of the transmission interference of each receiving end and the angle range of the azimuth angle of each receiving end do not overlap each other for multiple users with the same or completely same time domain, frequency domain or code domain.
Example 10
For embodiments 2-9, wherein the transmitting end may be one of a base station side equipped with multiple antennas or a user side equipped with multiple antennas; the receiving end may be one of a base station side or a user side.
The following description will be made with reference to fig. 2 to 5 to illustrate the transmission signal processing procedure of the transmitting end:
it is assumed that the security level parameter table preset by the transmitting end and the receiving end is shown in the following table:
| hierarchical index | Size of emission interference angle range | Number of interference beamforming vectors | Number of antennas required for |
| 5 | 60° | 10 | 128 |
| 4 | 50° | 8 | 64 |
| 3 | 40° | 6 | 64 |
| 2 | 30° | 4 | 48 |
| 1 | 0° | 0 | 48 |
In the table, the level index 1 indicates the size of the transmission interference angle range, the number of interference beam forming vectors is zero, and the transmission signal does not transmit interference.
Assuming that the number of antennas N required by the transmitting end is 64, the determinable rank index vector is [1, 2, 3, 4] according to the parameters in the above table. And transmitting the downlink pilot signal with the grade index vector of [1, 2, 3, 4] to a receiving end. It should be noted that the transmitting end transmits at least one of the following: 1) a signal containing reference information and rank index vector information determined based on own antenna configuration; 2) and only signals containing the grade index vector information determined based on the self antenna configuration and downlink pilot signals.
After the receiving end receives the downlink pilot signal transmitted by the transmitting end to carry out channel estimation, the gain vector of the downlink channel is hbAssuming that the first angular range is [ theta ]l,θh]＝[87.5°,92.5°]. The current service has higher requirement on security, and a grade index vector [1, 2, 3, 4] is selected]Level index 3 in (1) is a security level.
The rank index selected by the receiving end is 3, and the size Δ of the transmission interference angle range is 40 ° and the number M of interference beam forming vectors is 6 by looking up the table.
And the transmitting terminal calculates a first beam forming parameter according to the downlink channel information and calculates a second beam forming parameter according to the transmitting signal parameter. Wherein the first power threshold may be set to γBThe second angle range may be set to [0,87.5 ° ] q, 30dBm]∪[92.5°,180°]The third angle range is [67.5 degrees ], 112.5 degrees °]The third power threshold is Pt＝35dBm。
And finally, the transmitting end processes the transmitting signal according to the first beam forming parameter and the second beam forming parameter to obtain the processed transmitting signal.
Fig. 2 is a schematic diagram of the directional structures of the first beamforming vector and the second beamforming vector, in which the solid line is the power distribution of the signal, and the six dotted lines are the power distributions of six independent interferers, respectively. As can be seen, the first beamforming vector concentrates the signal power in the first angular range, minimizing the signal leakage power in the second angular range; the six interference beams included in the second beam forming vector respectively correspond to one sub-angle interval, and certain power distribution is kept in other angle intervals.
It should be emphasized here that the division of the third angle interval makes the interference power concentrate on the angle area with larger signal leakage, rather than transmit the interference omnidirectionally, so that the embodiment can be applied to the multi-cell scenario, and reduces the interference to the neighboring cell; the case where the number of interference beamforming vectors M >1 makes the system resistant to multiple eavesdroppers.
The following section analyzes the ability of this embodiment to combat multiple eavesdroppers.
Fig. 3 is a schematic diagram showing the influence of the number of independent interferers on the system capacity in the case where an eavesdropper handles a received signal alone.
Specifically, the signal received by the legal receiving end is
The eavesdropper receives as the signal
Wherein, ybReceiving signals for a legal receiving end; y ise,kReceiving signals for an illegal eavesdropper, wherein K is the total number of the illegal eavesdroppers; n isbAdditive Gaussian interference is generated for a legal receiving end; n ise,kK is 1,2, and K is additive gaussian interference at the receiving end of the kth illegal eavesdropper; h is0Is a channel parameter vector between a base station and a legal receiving end; h iskK is a channel parameter vector from the base station to the kth eavesdropper.
Therefore, the receiving signal-to-noise ratio of a legal receiving end and each eavesdropper and the safety capacity of the system can be respectively calculated, and the safety capacity can be expressed as
Wherein, the SINRBFor receiving signal-to-noise ratio and SINR of legal receiving ende,kThe received signal-to-noise ratio of the kth eavesdropper.
As can be seen from fig. 3, the security rate of the system decreases with the increase of eavesdroppers, but by comparing the change of the security rate under different M, it can be seen that, in the presence of multiple interferences (M ═ 6, 8), the decrease of the security rate is very slow, and the system has certain capability of resisting multiple eavesdroppers; on the other hand, comparing M to 6 and 8 shows that the increase in the number of interferers can further increase the security rate of the system and enhance the ability to fight against multiple eavesdroppers.
Fig. 4 is a schematic diagram illustrating the influence of the number of eavesdroppers on the security capacity of the system under different interference numbers in the case where multiple eavesdroppers process the received signals together.
Specifically, the eavesdropper processes the received signal jointly with the MMSE receiver, and the received signal can be expressed as:
yE＝hEs+nE
＝hEs+Hnna+n
in particular, yE＝[yE,1,yE,2,...,yE,K]TArtificial interference vector na＝[na,1,na,2,...,na,M]TInterference vector n ═ ne,1,ne,2,...,ne,K]T。nE＝Hnna+ n is the received equivalent interference. h isEAnd HnRespectively, the equivalent channels of the signal and the artificial interference are respectively in the form of:
the MMSE receiver can be expressed as:
therefore, for an eavesdropper colluding to process the signal, the received signal is:
wherein,
is a covariance matrix of equivalent interference. The SINR (Signal to interference plus Noise Ratio) of an eavesdropper can be expressed as
Thus, the performance behavior of multiple eavesdroppers when jointly processing the received signals with an MMSE receiver is analyzed.
As can be seen from fig. 4, in the system where the united eavesdropper exists, the achievable security rate is significantly higher in both cases of M4 and 8 than in the case of M0; further, the more the number of existing interferences, the slower the rate at which the system security rate decreases as K increases; when K is larger, the interference number obviously improves the system safety rate. This makes it possible to obtain the number of interference beamforming vectors that is resistant to a joint eavesdropper.
Fig. 5 is a schematic diagram of the convergence rate of the algorithm for calculating the second beamforming parameter, and it can be seen that the algorithm converges very fast, and can converge to the final value in about three steps.
According to the signal processing method, the transmitting signal parameters are determined, and the determined transmitting signal parameters are used for signal transmission; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in the angle area with higher signal leakage power, and the adjacent cell interference caused by omnidirectional occurrence is avoided; and random interference of multiple dimensions is transmitted in a signal leakage area to resist the existence of multi-eavesdropping, so that the security threat of a multi-eavesdropper on a wireless system is effectively reduced.
Example 11
As shown in fig. 6, an embodiment of the present application provides a signal processing apparatus, including: a memory 21, a processor 22 and a signal processing program stored on the memory 21 and operable on the processor 22, the signal processing program being used to implement the steps of the signal processing method according to embodiment 1 when executed by the processor 22.
It should be noted that the signal processing apparatus in this embodiment has the same concept as the method in embodiment 1, and specific implementation processes thereof are detailed in the method embodiment, and technical features in the method embodiment are all correspondingly applicable in this embodiment, which is not described herein again.
The signal processing device of the embodiment of the application determines the transmission signal parameters and utilizes the determined transmission signal parameters to send signals; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in the angle area with higher signal leakage power, and the adjacent cell interference caused by omnidirectional occurrence is avoided; and random interference of multiple dimensions is transmitted in a signal leakage area to resist the existence of multi-eavesdropping, so that the security threat of a multi-eavesdropper on a wireless system is effectively reduced.
Example 12
The embodiment of the present application provides a computer-readable storage medium, on which a signal processing program is stored, and the signal processing program is used for implementing the steps of the signal processing method described in embodiment 1 when being executed by a processor.
It should be noted that the computer-readable storage medium of this embodiment belongs to the same concept as the method of embodiment 1, and specific implementation processes thereof are detailed in the method embodiment, and technical features in the method embodiment are all correspondingly applicable in this embodiment, which is not described herein again.
The computer-readable storage medium of the embodiment of the application, by determining the transmission signal parameter, performs signal transmission by using the determined transmission signal parameter; the power leakage of the processed transmitting signal outside the angle range of the receiving end is minimized; the interference signals are concentrated in the angle area with higher signal leakage power, and the adjacent cell interference caused by omnidirectional occurrence is avoided; and random interference of multiple dimensions is transmitted in a signal leakage area to resist the existence of multi-eavesdropping, so that the security threat of a multi-eavesdropper on a wireless system is effectively reduced.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). The term computer storage media includes volatile and nonvolatile, removable and non-removable media implemented in any method or technology for storage of information such as computer readable instructions, data structures, program modules or other data, as is well known to those of ordinary skill in the art. Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disks (DVD) or other optical disk storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other medium which can be used to store the desired information and which can accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules or other data in a modulated data signal such as a carrier wave or other transport mechanism and includes any information delivery media as known to those skilled in the art.
The preferred embodiments of the present application have been described above with reference to the accompanying drawings, and are not intended to limit the scope of the claims of the application accordingly. Any modifications, equivalents and improvements which may occur to those skilled in the art without departing from the scope and spirit of the present application are intended to be within the scope of the claims of the present application.
Claims (12)
1. A method of signal processing, the method comprising at least one of:
the sending end receives at least one of the security level index, the security level parameter information and the channel information fed back by the receiving end to determine a signal transmission parameter and/or send a signal;
the sending end sends at least one of the security level index and the security level parameter information to the receiving end to determine a signal sending parameter and/or sends a signal;
and the transmitting end determines the transmitting signal parameters according to at least one of the security level index, the security level parameter information and the channel information and/or transmits signals.
2. The method of claim 1, wherein the transmitted signal parameters comprise at least one of:
the size of the range of the emission interference angle, the number of interference beam forming vectors and the number of antennas required by emission.
3. The method of claim 1, wherein the transmitting end receives at least one of the security level index, the security level parameter information, and the channel information fed back by the receiving end to determine the transmission signal parameter, and comprises at least one of:
the sending end selects t security level indexes from the information fed back by the receiving end to determine the parameters of the transmitted signals;
the transmitting end determines transmitting signal parameters according to the security level indexes fed back by the plurality of receiving ends;
wherein t is a positive integer greater than or equal to 1.
4. The method of claim 3, wherein the sending end selects a security level index from the information fed back from the receiving end to determine the parameters of the transmitted signal, and the security level index comprises at least one of:
the receiving end transmits N security level indexes to the transmitting end; the sending end selects t security level indexes from the N security level indexes fed back by the receiving end; wherein N is a positive integer greater than or equal to 1, t is a positive integer greater than or equal to 1, and t < ═ N.
5. The method of claim 1, wherein after the transmitting end receives at least one of the security level index, the security level parameter information, and the channel information fed back by the receiving end, the method further comprises:
under the condition that the security level index fed back by the receiving end does not have the level index supported by the sending end, feeding back service termination information to the receiving end; or sending or feeding back parameters corresponding to the security level close to the security level of the receiving end to determine and send the transmission signal; and/or, notifying a current security level index to the receiving end; or determining the transmitting signal according to the parameter corresponding to the default security level and transmitting the transmitting signal.
6. The method of claim 3, wherein the transmitting end determines the transmission signal parameters according to the security level indexes fed back by the plurality of receiving ends, and the determining comprises at least one of:
the sending end transmits the grade index vectors to the plurality of receiving ends;
and the sending end receives the required grade index information fed back by the plurality of receiving ends, and selects one or more receiving ends and/or the safety grade index corresponding to the receiving ends.
7. The method of claim 6, wherein the transmitting end receives the required level index information fed back by the plurality of receiving ends, and thereafter further comprises:
under the condition that the resources of the transmitting terminal are saturated, the transmitting terminal feeds back service termination information to the plurality of receiving terminals; or,
and only the part serving a plurality of receiving ends transmits signals based on the safety level information fed back by the receiving ends and/or the supportable safety level capability of the transmitting ends.
8. The method of claim 1, wherein the sending end sends at least one of a security level index and security level parameter information to the receiving end to determine the transmission signal parameter, and the method comprises at least one of:
the receiving end feeds back channel information obtained through channel estimation to the transmitting end;
the receiving end feeds back one or more grade indexes selected based on the current service type to the transmitting end;
and the receiving end feeds back required grade index information determined based on the current service type to the transmitting end.
9. The method of claim 8, wherein the receiving end feeds back one or more level indexes selected based on a current traffic type to the transmitting end, and wherein the level indexes comprise at least one of:
the transmitting terminal transmits N level index vectors to the receiving terminal;
and the receiving end selects one or more grade indexes in the N grade index vectors according to the service types, wherein N is a positive integer greater than or equal to 1.
10. The method according to claim 8 or 9, characterized in that the method further comprises:
under the condition that the grade index required by the service type does not exist in the N grade index vectors, the receiving end feeds back service termination information to the transmitting end; or sending or feeding back parameters corresponding to the security level close to the security level of the receiving end to determine and send the transmission signal; and/or, notifying a current security level index to the receiving end; or determining the transmitting signal according to the parameter corresponding to the default security level and transmitting the transmitting signal.
11. A signal processing apparatus, characterized in that the signal processing apparatus comprises a memory, a processor and a signal processing program stored on the memory and executable on the processor, the signal processing program, when executed by the processor, implementing the steps of the signal processing method according to any one of claims 1 to 10.
12. A computer-readable storage medium, having stored thereon a signal processing program which, when executed by a processor, implements the steps of the signal processing method according to any one of claims 1 to 10.
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