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CN111211806B - Method for avoiding unknown inter-system communication interference - Google Patents

Method for avoiding unknown inter-system communication interference Download PDF

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CN111211806B
CN111211806B CN202010028339.8A CN202010028339A CN111211806B CN 111211806 B CN111211806 B CN 111211806B CN 202010028339 A CN202010028339 A CN 202010028339A CN 111211806 B CN111211806 B CN 111211806B
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interference
information
user
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uplink
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CN111211806A (en
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张艳秋
冯伟
王珏
曹娟
杨永杰
路易
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Nantong Research Institute for Advanced Communication Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract

The invention discloses an avoidance method for unknown inter-system communication interference, which belongs to the technical field of communication and realizes avoidance of interference through the following steps; step one, user equipment accesses a base station; the base station periodically stops data transmission and measures interference information to obtain real-time interference information, wherein the interference information comprises interference intensity and interference direction; and step three, comparing the real-time interference information with preset information and user information, and executing an anti-interference strategy according to a comparison result. The invention has the advantages that: by measuring the interference situation at regular time, other auxiliary equipment is not needed; and the interference avoidance strategy is self-adaptively adjusted by a mode of acquiring and judging the interference information at regular time, so that the self-adaptive dynamic interference avoidance with pertinence and flexibility can be realized.

Description

Method for avoiding unknown inter-system communication interference
Technical Field
The invention relates to the field of communication, in particular to an avoidance method for unknown different-system communication interference.
Background
The sea area communication system is often a private network (hereinafter referred to as private network) designed for the requirement of specific sea area operation activities. Due to industry barriers and the like, different private networks in the prior art lack unified specifications, for example, antenna designs of different systems do not have unified standards, and the like, which causes that a sea area communication system often faces different system interferences from a ground private network or other sea networks, and seriously affects the communication quality of the system. Therefore, an effective interference avoidance method and system are particularly important for sea communication. The interference avoidance method commonly used in communication is as follows:
1. interference coordination: the basic idea is that the scheduling and allocation of resources are coordinated among cells according to certain rules and methods, so as to avoid and reduce the same frequency interference among the cells.
2. Interference randomization: the colored interference signals of the adjacent regions with the same frequency are converted into random interference by a scrambling or interweaving method, so that the narrow-band colored interference is equivalent to white noise interference.
3. Interference suppression: the method is divided into two types of interference suppression of a transmitting end and interference suppression of a receiving end. The interference suppression of the receiving end is to suppress the interference of the adjacent regions by a method of joint detection or joint processing on the basis of the known interference signal characteristics. The interference suppression of the sending end is to achieve the purpose of interference suppression of the interfered user by the combined signal sending on the basis of the known channel characteristics of the interfered user.
4. Spread spectrum communication is anti-interference: the transmitting end uses pseudo-random code to carry out spread spectrum modulation, and the receiving end uses related de-spreading technology, thereby reducing the requirement of the system on the signal-to-noise ratio (SNR).
The methods 1 to 3 are mostly used for known adjacent cell interference, the suppression effect on the interference of an unknown different system is not obvious, the spectrum utilization rate of the 4 th method is low, and the four interference avoidance methods cannot be adaptively adjusted according to the interference condition, and are lack of pertinence and flexibility.
Disclosure of Invention
The technical problem to be solved by the invention is how to realize self-adaptive dynamic interference avoidance according to the interference condition in the communication process of an unknown system, and aiming at the technical problem to be solved, a method for avoiding the communication interference of the unknown different system is provided.
In order to achieve the purpose, the invention provides the following technical scheme: an avoidance method aiming at unknown different system communication interference realizes avoidance of interference through the following steps;
step one, user equipment accesses a base station;
the base station periodically stops data transmission and measures interference information to obtain real-time interference information, wherein the interference information comprises interference intensity and interference direction;
step three, comparing the real-time interference information with preset information and the incoming wave direction of the user and executing an anti-interference strategy according to the comparison result; the anti-interference strategy is set to keep the original communication mode for communication when the system has no interference; when the system has interference and the uplink interference is not in the same direction as the user, the base station side adopts a self-adaptive antenna beam forming mode to carry out communication; and when the system has interference and the uplink interference is in the same direction as or downlink interference of the user, the communication is carried out by adopting a spread spectrum communication mode.
Further, the comparing process of the real-time interference information and the preset information in the third step is to compare the interference strength with a preset threshold, if the real-time interference information is greater than the threshold, the comparing result is that interference exists, and if the real-time interference information is less than the threshold, the comparing result is that interference does not exist, and the comparing result includes an uplink process and a downlink process.
Further, the process of comparing the real-time interference information with the desired user is to compare the uplink interference direction with the incoming wave direction of the user, if the uplink interference direction and the incoming wave direction are the same, the comparison result is that the uplink interference is in the same direction as the user, and if the uplink interference direction and the incoming wave direction are different, the comparison result is that the uplink interference is in the different direction from the user.
Further, in the third step, the process of performing communication through the adaptive antenna beam forming manner is to implement spatial filtering through an adaptive weighted value, enhance the desired signal in the non-interference direction, and suppress the interference signal.
Further, the spread spectrum communication method includes despreading at a receiving end by using a despreading method, recovering a useful wideband information signal into a narrowband signal, and spreading an undesired signal into a wideband signal.
Compared with the prior art, the invention has the beneficial effects that:
the invention measures the interference condition at regular time without other auxiliary equipment; and the interference avoidance strategy is self-adaptively adjusted by a mode of acquiring and judging the interference information at regular time, so that the self-adaptive dynamic interference avoidance with pertinence and flexibility can be realized.
Drawings
FIG. 1 is a flow chart of the base station side uplink processing in the present invention;
fig. 2 is a flow chart of uplink processing at the ue side in the present invention;
FIG. 3 is a flow chart of the downlink processing at the base station side in the present invention;
fig. 4 is a downlink processing flow of the ue side in the present invention;
fig. 5 is a graph comparing the performance of the prior art uplink system and the uplink system in the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 5, the present embodiment discloses a method for avoiding unknown inter-system communication interference, and a method for avoiding unknown inter-system communication interference, which implements interference avoidance by the following steps;
step one, user equipment accesses a base station;
the base station periodically stops data transmission and measures interference information to obtain real-time interference information, wherein the interference information comprises interference intensity and interference direction;
comparing the real-time interference information with preset information and user information and executing an anti-interference strategy according to a comparison result; the anti-interference strategy is set to keep the original communication mode for communication when the system has no interference; when the system has interference and the uplink interference is not in the same direction as the user, the base station side adopts a self-adaptive antenna beam forming mode to carry out communication; and when the system has interference and the uplink interference is in the same direction as the expected user or the downlink interference, the communication is carried out by adopting a spread spectrum communication mode.
More specifically, the comparison process of the real-time interference information and the preset information in the third step is to compare the interference strength with a preset threshold, if the real-time interference information is greater than the threshold, the comparison result is that interference exists, if the real-time interference information is less than the threshold, the comparison result is that interference does not exist, and the comparison result includes an uplink process and a downlink process.
More specifically, the process of comparing the real-time interference information with the user is to compare the uplink interference direction with the user direction, if the uplink interference direction is the same as the user direction, the comparison result is that the uplink interference is in the same direction as the user, and if the uplink interference direction is different from the user direction, the comparison result is that the uplink interference is in the different direction from the user.
More specifically, in the third step, the process of performing communication through the adaptive antenna beam forming manner is to implement spatial filtering through an adaptive weighted value, enhance the desired signal in the non-interference direction, and suppress the interference signal.
More specifically, the spread spectrum communication method includes despreading at a receiving end by using a despreading method, recovering a useful wideband information signal into a narrowband signal, and spreading an undesired signal into a wideband signal.
In this embodiment, specific method and processes of the uplink process and the downlink process are described in detail.
In the uplink communication, after the user equipment accesses a cell, a base station transmits a spreading code to the user equipment; the base station periodically measures interference information and issues uplink interference mark information; the user equipment reports the position information after receiving the interference information; the base station adaptively selects the spread spectrum or adjusts the antenna receiving directional diagram to avoid the interference according to the position information of the user equipment, and the method can adaptively adjust the interference avoiding method according to the interference condition borne by the system, thereby improving the overall performance of the system.
Specifically, taking TD-LTE system as an example, a processing procedure at the base station side is shown in fig. 1, a processing procedure at the user equipment side is shown in fig. 2, and the whole processing procedure includes the following steps:
step 1, user equipment UE accesses a base station.
Step 2, the base station issues a spreading code a uniquely corresponding to each user in the cell1m,a2m,...,aNmTo the corresponding user equipment UEm；
And step 3, the base station periodically stops data transmission and measures interference information, for example, the stopping period can adopt intervals of 60s, 90s, 120s and the like, wherein the measured interference information comprises interference strength and interference direction.
Step 4, judging the received interference power, if the received interference power is larger than a threshold value PAThen the flag F will be disturbedmDevice 1Then, the data is sent to the user equipment, and the step 5 is carried out; otherwise, the flag F will be disturbedmSetting 0 and sending to the user equipment, and entering step 9; wherein, PAThe value of (A) can be-100 dBm, -95dBm, etc., FmIs flag information for identifying the presence or absence of interference.
And 5, estimating the interference direction by the base station side according to the incoming wave Direction (DOA), wherein a multiple signal classification (MUSIC) algorithm, a signal parameter Estimation (ESPRIT) algorithm based on a rotation invariant technology and the like can be specifically adopted.
Step 6, reporting the position information of the user equipment through an assisted global navigation satellite system (A-GNSS);
step 7, the base station judges the direction of the interference and the user equipment, if the included angle of the direction is less than 3 degrees, the spread spectrum mark C is markedm Setting 1 and then sending to the user equipment, and entering step 10; otherwise, entering step 8; wherein, the spread spectrum flag CmTo identify whether spread spectrum processing is employed.
Step 8, performing adaptive antenna beam forming based on a beam forming (ESB) algorithm of a characteristic space, and adjusting null alignment interference of a base station antenna directional diagram, namely adjusting the alignment direction of the lowest antenna gain position;
step 9, the base station marks the spread spectrum CmSetting 0 and then sending to the user equipment;
step 10, the user equipment processes each code word q, bit block
Figure BDA0002363291030000041
(wherein
Figure BDA0002363291030000042
Representing the number of bits in the codeword q on the physical channel transmitted in one subframe) to generate a block of scrambled bits
Figure BDA0002363291030000043
Step 11, scrambling code bit block
Figure BDA0002363291030000044
Modulating to generateA block of complex valued modulation symbols
Figure BDA0002363291030000051
If FmStep 12a is entered if 1, otherwise step 12b is entered;
step 12a, modulating the symbol block with complex value
Figure BDA0002363291030000052
Spread spectrum processing is carried out to obtain a spread spectrum sequence
Figure BDA0002363291030000053
Step 12b, modulating the complex value of the code word q into a symbol
Figure BDA0002363291030000054
Is divided into
Figure BDA0002363291030000055
Subsets, each subset corresponding to a single-carrier frequency division multiple access (SC-FDMA) symbol. The transmission precoding is as follows:
Figure BDA0002363291030000056
obtaining a complex-valued symbol block
Figure BDA0002363291030000057
Variables of
Figure BDA0002363291030000058
Wherein
Figure BDA0002363291030000059
The number of resource blocks in a Physical Uplink Shared Channel (PUSCH) bandwidth is represented, and the following requirements are met:
Figure BDA00023632910300000510
wherein alpha is2,α3,α5Is a set of non-negative integer values;
step 13, the complex value symbol block
Figure BDA00023632910300000511
Or a spreading sequence
Figure BDA00023632910300000512
Multiplied by an amplitude factor betaPUSCHThen from z (0) or a1md(q)(0) Starting to be mapped to physical resource blocks allocated to the PUSCH in sequence;
step 14, generating an SC-FDMA signal and sending data at an antenna port;
and step 15, the base station side receives and demodulates the uplink information.
In the downlink communication, after the user equipment accesses a cell, a base station transmits a spreading code to the user equipment; the user equipment periodically measures interference information and reports the interference information to the base station; the base station adaptively adjusts the data processing method for downlink transmission according to the interference condition, and the method can effectively and adaptively avoid the narrow-band interference of different systems and reduce the requirement on the signal-to-noise ratio of a communication system.
In order to achieve the above object, the downlink interference avoidance strategy and system provided by the present invention, taking TD-LTE as an example, a processing procedure at a base station side is shown in fig. 3, and a processing procedure at a user equipment side is shown in fig. 4, and the method includes the following steps:
step 1, corresponding user equipment accesses a cell;
step 2, the base station issues a spreading code a uniquely corresponding to each user in the cell1m,a2m,...,aNmTo the corresponding user equipment UEm；
Step 3, the base station and all the user equipment in the cell periodically stop data transmission, and the user equipment measures interference information;
step 4, judging the interference power received by the user equipment, if the interference power is larger than the threshold value PAThen the flag F will be disturbedm1, reporting to a base station; otherwise, the flag F will be disturbedmAfter setting 0, reporting to the base station; wherein, PAThe value of (A) can be-100 dBm, -95dBm, etc., FmIs flag information for identifying the presence or absence of interference.
Step 5, the base station side carries out the bit block of each code word q
Figure BDA0002363291030000061
(wherein
Figure BDA0002363291030000062
Representing the number of bits in the codeword q on the physical channel transmitted in one subframe) to generate a block of scrambled bits
Figure BDA0002363291030000063
Step 6, the base station side pairs the scrambling code bit block
Figure BDA0002363291030000064
Modulating to generate a complex-valued modulation symbol block
Figure BDA0002363291030000065
If FmIf not, entering step 7, otherwise, entering step 8;
step 7, modulating the symbol block to complex value
Figure BDA0002363291030000066
Spread spectrum processing is carried out to obtain a spread spectrum sequence
Figure BDA0002363291030000067
Step 8, modulating the complex value of the code word q into a symbol
Figure BDA0002363291030000068
Or a spreading sequence
Figure BDA0002363291030000069
Mapping to layer x (i) ═ x(0)(i) ... x(υ-1)(i)]T,
Figure BDA00023632910300000610
Where v is the number of layers,
Figure BDA00023632910300000611
is the number of modulation symbols per layer;
step 9, output x (i) of layer mapping is set to [ x ═ x(0)(i) ... x(υ-1)(i)]TPrecoding processing is performed to generate vector blocks y (i) [ < y > ] mapped to the resources of each antenna port(0)(i) ... y(P-1)(i)]T，
Figure BDA00023632910300000612
Wherein y is(p)(i) Represents the signal on antenna port p;
step 10, complex symbol block for each antenna port used for physical channel transmission
Figure BDA00023632910300000613
Will be from y(p)(0) Starting to map resources;
step 11, generating Orthogonal Frequency Division Multiplexing (OFDM) symbols and transmitting data at each antenna port.
Fig. 5 is a Bit Error Rate (BER) simulation comparison diagram of a conventional communication mode and the adaptive dynamic interference avoidance system proposed in the present patent when the system is in different SNRs in uplink communication, and it can be seen from the simulation result that the bit error rate of the adaptive interference avoidance system proposed in the present application is significantly reduced when the signal-to-noise ratio is low.
The system applying the method of the invention can measure the interference situation at regular time without other auxiliary equipment; the interference avoiding strategy is adaptively adjusted in a mode of acquiring and judging interference information at fixed time; and the specific strategy is to adopt the original common communication mode when the system has no interference; when the system has interference and the uplink interference is not in the same direction as the user: the base station side adopts a self-adaptive antenna beam forming technology, realizes spatial filtering through a self-adaptive weighted value, enhances an expected signal in a non-interference direction and simultaneously suppresses an interference signal; when the system has interference and the uplink interference is in the same direction as the user or the downlink interference: the spread spectrum communication mode is adopted, the occupied bandwidth of the useful information is relatively wide during space transmission, and a receiving end adopts related detection to despread, so that the useful broadband information signal is restored into a narrow-band signal, and an undesired signal is spread into a broadband signal. Therefore, for various interference signals, due to the non-correlation of the interference signals at the receiving end, only very weak components exist in the despread narrowband signals, and the signal-to-noise ratio is very high, so that the interference resistance is strong.
It is feasible that in other embodiments of the present invention, a single adaptive antenna beam forming technique or a spread spectrum technique may be used to avoid interference. However, the single adaptive antenna beam forming technology has no improvement effect on the co-directional situation of interference and a desired signal, and the single spread spectrum technology has low spectrum utilization rate.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims (3)

1. An avoidance method aiming at unknown communication interference of different systems is characterized in that the interference is avoided through the following steps;
step one, user equipment accesses a base station;
the base station periodically stops data transmission and measures interference information to obtain real-time interference information, wherein the interference information comprises interference intensity and interference direction;
comparing the real-time interference information with preset information and a user position and executing an anti-interference strategy according to a comparison result; the anti-interference strategy is set to keep the original communication mode for communication when the system has no interference; when the system has interference and the uplink interference is not in the same direction as the incoming wave direction of the user, the base station side adopts a self-adaptive antenna beam forming mode to carry out communication; when the system has interference and the uplink interference is in the same direction as the incoming wave direction of the user or the downlink interference exists, communication is carried out in a spread spectrum communication mode;
the comparison process of the real-time interference information and the preset information in the third step is that the interference strength is compared with a preset threshold value, if the real-time interference information is larger than the threshold value, the comparison result is that interference exists, if the real-time interference information is smaller than the threshold value, the comparison result is that no interference exists, and the comparison result comprises an uplink process and a downlink process;
in the third step, the process of comparing the real-time interference information with the incoming wave direction of the user is to compare the uplink interference direction with the incoming wave direction of the user, if the uplink interference direction and the incoming wave direction of the user are the same, the comparison result is that the uplink interference is in the same direction as the user, and if the uplink interference direction and the incoming wave direction of the user are different, the comparison result is that the uplink interference is in the different direction from the user.
2. An avoidance method for unknown inter-system communication interference according to claim 1, wherein the process of communicating through adaptive antenna beam forming in step three is to implement spatial filtering through adaptive weighting values, enhance the desired signal in the non-interference direction and suppress the interference signal.
3. An avoidance method for unknown inter-system communication interference according to claim 1, wherein the spread spectrum communication method comprises despreading at a receiving end by using a despreading method, recovering a useful wideband information signal to a narrowband signal, and spreading an undesired signal to a wideband signal.
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