CN106160827B

CN106160827B - Multi-user information processing method and device

Info

Publication number: CN106160827B
Application number: CN201510192110.7A
Authority: CN
Inventors: 袁志锋; 戴建强; 胡留军; 郁光辉
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2015-04-21
Filing date: 2015-04-21
Publication date: 2020-12-25
Anticipated expiration: 2035-04-21
Also published as: WO2016169414A1; CN106160827A

Abstract

The invention discloses a multi-user information processing method and a multi-user information processing device, which are used for improving the system performance. The method comprises the following steps: dividing user information into i groups, wherein each group comprises user information of n users, i is a positive integer, n is a positive integer and is more than or equal to 2, and respectively mixing the user information of the n users in the i groups to obtain i mixed symbols; and respectively expanding the i mixed symbols by adopting i sequences with the length of K to obtain i symbol sequences with the length of K, wherein K is a positive integer. The apparatus includes a mixing module and an expansion module. By adopting the method and the device of the embodiment of the invention, the system obtains diversity gain, and the terminal obtains better SIC robustness; in addition, the system can be scheduled in full bandwidth, and is simple and convenient.

Description

Multi-user information processing method and device

Technical Field

The present invention relates to the field of communications, and in particular, to a method and an apparatus for processing multi-user information.

Background

Designing a multi-user wireless communication scheme requires taking into full account the propagation characteristics of the wireless channel and the interference between signals, which is the most important factor for obtaining high system performance. For example, in a multi-user synchronous CDMA (code division multiple access) system, user information is separated by spreading codes, each digitally modulated data symbol is first spread by a spreading sequence with a length of K, each modulated data symbol is spread into a symbol sequence with a length of K, and then all the spread symbol sequences can be transmitted on the same time-frequency resource. The longer the spreading sequence length, the easier it IS to ensure low correlation between spreading sequences, e.g., IS-95 uses 64-bit Walsh codes and CDMA2000 uses longer spreading codes to achieve greater system capacity. Finally, the CDMA receiver receives a composite signal in which all the spread signals are superimposed, and uses the interference from other users as additive noise, and uses its own spread sequence to separate its own information from the composite signal by means of multi-user detection technique. When the number of users exceeds 100% load, its performance drops sharply.

Similar to the orthogonal multiplexing method of synchronous CDMA, the multi-user information may also be broadcast by multiplexing methods such as FDM (frequency division multiplexing), OFDM (orthogonal frequency division multiplexing), and the like. Here, broadcasting refers to that a transmitter superimposes modulation symbols of different user information and simultaneously transmits the superimposed modulation symbols to a plurality of receivers, and different users extract their own information from a received composite signal. While another non-orthogonal multiplexing mode exists, the NOMA (non-orthogonal multiple access) technology can meet the requirement of higher system throughput. The NOMA technique uses superposition coding on the transmitting side and interference cancellation on the receiving side. The superposition coding directly superposes modulation symbols of multiple UEs (user equipments or terminals) in the power domain. The UE receives a superimposed symbol obtained by superimposing user symbols, and the user information is interfered with each other during demodulation, and usually the receiving end needs to perform Successive Interference Cancellation (SIC) separation information.

Classical literature has demonstrated that the multi-user information capacity limit can be reached using non-orthogonal multiple access multiplexing in combination with the code block level SIC technique. However, the code block-level SIC may cause high implementation complexity, power consumption, and delay, which are sometimes unacceptable for the terminal, so the terminal urgently needs a simple symbol-level SIC (which is simple to implement but has a lossy performance without reconstructing a user symbol), and if the terminal is an AWGN (Additive White Gaussian Noise) channel, the performance can be basically guaranteed by making the symbol-level SIC during demodulation.

Under an actual mobile fading channel, when a transmission symbol is located at a deep fading channel, the possibility that these single symbols after deep fading are decoded by a receiving end is very high, and there is also a great risk of error propagation when the superimposed symbols after deep fading are used as symbol-level SIC, thereby causing the degradation of access performance. If a good narrowband scheduling scheme is adopted to overcome the disadvantage, the overhead of narrowband scheduling is large.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a multi-user information processing method and device, and improve the system performance.

In order to solve the above technical problem, the present invention provides a multi-user information processing method, including:

dividing user information into i groups, wherein each group comprises user information of n users, i is a positive integer, n is a positive integer and is more than or equal to 2, and respectively mixing the user information of the n users in the i groups to obtain i mixed symbols;

and respectively expanding the i mixed symbols by adopting i sequences with the length of K to obtain i symbol sequences with the length of K, wherein K is a positive integer.

Further, the method further comprises: and forming a transmitting signal by the obtained i symbol sequences with the length of K, and sending the transmitting signal to a plurality of users in the i group.

Further, the method further comprises: and combining the i symbol sequences with the length of K to obtain combined symbol sequences.

Further, the method further comprises: and forming a transmitting signal by the combined symbol sequence and sending the transmitting signal to a plurality of users.

Further, the mixing the user information of the n users in the i group respectively includes:

modulating and mixing user information of n users in each group; or

Mixing the user information of the n users in each group before modulation; or

And carrying out logic operation on the user information of the n users in each group before modulation, and mixing after modulation.

Further, the mixing the user information of the n users in each group after modulation includes: and modulating the user information of the n users in each group to obtain n user modulation symbols, and adding the n user modulation symbols.

Further, the mixing the user information of the n users in each group before modulation includes: and mixing the user information of the n users in each group in a bit combination mode before modulation.

Further, the logic operation of the user information of the n users in each group before modulation and the mixing after modulation includes: after carrying out logic operation on part of bit information of n users in each group, modulating to obtain n user modulation symbols, adding the n user modulation symbols, and obtaining a constellation diagram consisting of all possible constellation points of a mixed symbol after adding, wherein the constellation diagram has a gray mapping attribute.

Further, the performing logic operation on the partial bit information of the n users in each group includes: and when n is 2, performing exclusive-or operation on the bit information of the first user and the partial bit information of the second user in each group, wherein the operation result is used as one part of the new bit information of the second user, and the partial bit information of the second user which is not subjected to logic operation is used as the other part of the new bit information of the second user.

Further, the i K long sequences satisfy one or more of the following conditions:

the i K long sequences comprise real sequences and/or complex sequences;

the i K long sequences are the same or different;

the i K long sequences are mutually orthogonal sequences or non-orthogonal sequences.

Further, the forming the sequence of symbols into a transmission signal includes:

and mapping the symbol sequence to time-frequency resources, wherein the time-frequency resources comprise a plurality of frequency domain resources corresponding to the same time domain resource, or the same frequency domain resource corresponding to a plurality of different time domain resources, or a plurality of frequency domain resources corresponding to a plurality of different time domain resources.

Further, when the time frequency resource includes a plurality of frequency domain resources corresponding to the same time domain resource, the symbol sequence is placed in a continuous bandwidth on a frequency domain, or is placed in a dispersed manner in the whole frequency band.

In order to solve the above technical problem, the present invention further provides a multi-user information processing apparatus, including a mixing module and an extension module, wherein:

the mixing module is used for dividing the user information into i groups, each group comprises the user information of n users, i is a positive integer, n is a positive integer and is not less than 2, and the user information of the n users in the i groups is mixed to obtain i mixed symbols;

the spreading module is configured to spread the i mixed symbols by using i K-long sequences, so as to obtain i K-long symbol sequences, where K is a positive integer.

Further, the device further comprises a transmitting module, configured to form a transmitting signal from the obtained i symbol sequences with the length of K, and send the transmitting signal to a plurality of users in the i group.

Further, the apparatus further includes a combining module, configured to combine the i symbol sequences with the length of K to obtain a combined symbol sequence.

Further, the apparatus further includes a transmitting module, configured to form a transmitting signal from the combined symbol sequence, and send the transmitting signal to a plurality of users.

Further, the mixing module performs mixing processing on the user information of n users in the i group respectively, including:

the mixing module mixes the modulated user information of the n users in each group; or

The mixing module mixes the user information of the n users in each group before modulation; or

And the mixing module performs logic operation on the user information of the n users in each group before modulation, and then mixes the user information after modulation.

Further, the mixing module mixes the modulated user information of the n users in each group, including: the mixing module modulates the user information of n users in each group to obtain n user modulation symbols, and adds the n user modulation symbols.

Further, the mixing module mixes the user information of the n users in each group before modulation, including: and the mixing module mixes the user information of the n users in each group in a bit combination mode before modulation.

Further, the mixing module performs logic operation on the user information of the n users in each group before modulation, and then performs mixing after modulation, including: the mixing module carries out logical operation on part of bit information of n users in each group, obtains n user modulation symbols through modulation, adds the n user modulation symbols, and a constellation diagram formed by all possible constellation points of the mixed symbols obtained through addition has gray mapping attribute.

Further, the mixing module performs logic operation on the partial bit information of the n users in each group, including: and when n is 2, the mixing module performs exclusive-or operation on the bit information of the first user and the partial bit information of the second user in each group, the operation result is used as one part of the new bit information of the second user, and the partial bit information of the second user which is not subjected to logic operation is used as the other part of the new bit information of the second user.

the i K long sequences comprise real sequences and/or complex sequences;

the i K long sequences are the same or different;

Further, the sending module forms the symbol sequence into a transmission signal, including:

the sending module maps the symbol sequence to time-frequency resources, where the time-frequency resources include multiple frequency-domain resources corresponding to the same time-domain resource, or the same frequency-domain resources corresponding to multiple different time-domain resources, or multiple frequency-domain resources corresponding to multiple different time-domain resources.

Further, when the time-frequency resource includes a plurality of frequency-domain resources corresponding to the same time-domain resource, the sending module places the symbol sequence in a continuous bandwidth in a frequency domain, or in a dispersed manner in the whole frequency band.

The embodiment of the invention obtains the time-frequency domain diversity gain by expanding the mixed symbol, so as to at least solve the problems that when the mixed symbol is sent in a downlink, under an actual fading channel, a single symbol after deep attenuation is very likely to be decoded and mistakenly by a receiving end, and a sum symbol after deep attenuation has a very large error propagation risk when being subjected to symbol level SIC, so that the access performance is reduced. In summary, the advantages of the embodiments of the present invention include: the system obtains diversity gain, and the terminal obtains better SIC robustness; the system can be scheduled with full bandwidth, and is simple and convenient.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a flow chart of example 1 of the present invention;

FIG. 2 is a schematic structural diagram of an apparatus according to embodiment 2 of the present invention;

FIG. 3 is a diagram of the process of multi-user information processing at the transmitter in application example 1;

fig. 4 is a schematic diagram of application example 1 in which QPSK symbols and 16QAM symbols are directly superimposed;

fig. 5 is a diagram of a spreading process using example 1 hybrid symbols;

FIG. 6 is a diagram of the process of multi-user information at the transmitter in application example 2;

FIG. 7 is a diagram of an application example 2-bit information combination;

fig. 8 shows the process of applying example 3 to multi-user information at the transmitter.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. Also, the steps illustrated in the flowcharts of the figures may be performed in a computer system such as a set of computer-executable instructions, and while a logical order is illustrated in the flowcharts, in some cases, the steps illustrated or described may be performed in an order different than here.

Example 1

The present embodiment describes a multi-user information processing method, as shown in fig. 1, including:

step 110, dividing user information into i groups, each group containing user information of n users, wherein i is a positive integer (i.e. i is greater than or equal to 1), n is a positive integer and is greater than or equal to 2, and respectively mixing the user information of the n users in the i groups to obtain i mixed symbols;

optionally, the above-mentioned mixing processing of the user information of n users in the i group may adopt one of the following manners:

in the first mode, the user information of n users in each group is modulated and then mixed;

specifically, the user information of n users in each group is modulated to obtain n user modulation symbols, and the n user modulation symbols are added.

Mixing the user information of the n users in each group before modulation;

specifically, the user information of n users in each group is mixed by means of bit combination before modulation. And the constellation diagram formed by all possible constellation points of the mixed symbol obtained after the addition has a Gray mapping attribute.

And thirdly, performing logic operation on the user information of the n users in each group before modulation, and mixing the user information after modulation.

Specifically, after performing logical operation on part of bit information of n users in each group, n user modulation symbols are obtained through modulation, the n user modulation symbols are added, and a constellation diagram formed by all possible constellation points of a mixed symbol obtained through addition has a gray mapping attribute.

For example, when n is 2, the bit information of the first user and the partial bit information of the second user in each group are subjected to exclusive or operation, the operation result is used as one part of the new second user bit information, and the partial bit information of the second user which is not subjected to logic operation is used as the other part of the new second user bit information.

The mixed symbol obtained in this step contains information of a plurality of users, and the information of other users is interference information relative to the information of the user.

And step 120, adopting i sequences with the length of K to respectively expand the i mixed symbols to obtain i symbol sequences with the length of K, wherein K is a positive integer.

Optionally, the i K long sequences satisfy one or more of the following conditions: the i K long sequences comprise real sequences and/or complex sequences; the i K long sequences are the same or different; the i K long sequences are mutually orthogonal sequences or non-orthogonal sequences. Where i ≠ K or i ≠ K.

After the mixed symbol is spread by the K long sequence, the obtained spread symbol is a K long symbol sequence, and the information of a plurality of users is spread into the K symbols.

In one embodiment, when i is 1, i.e. only one group, the method further comprises

Step 130: and forming a transmitting signal by the obtained i symbol sequences with the length of K, and sending the transmitting signal to a plurality of users in the i group.

In another embodiment, when i > 1, i.e. there are more than two groups, the method further comprises:

step 130', merging the i symbol sequences with the length of K to obtain merged symbol sequences;

when transmission is needed, the method can further comprise the following steps: and 140, forming a transmitting signal by the combined symbol sequence, and sending the transmitting signal to a plurality of users.

In the transmitting step (step 130 or step 140), the symbol sequence is mapped to a time-frequency resource, where the time-frequency resource includes multiple frequency-domain resources corresponding to a same time-domain resource, or a same frequency-domain resource corresponding to multiple different time-domain resources, or multiple frequency-domain resources corresponding to multiple different time-domain resources. When the time-frequency resource includes a plurality of frequency-domain resources corresponding to the same time-domain resource, the symbol sequence may be placed in a continuous bandwidth in a frequency domain, or may be placed in a distributed manner in the entire frequency band. That is, information of multiple users can be sent in a wider time domain resource or a wider frequency domain resource.

In the hybrid symbol spreading and transmitting method provided by the embodiment of the present invention, a hybrid symbol is spread by a sequence with a length of K to obtain a spread symbol, the spread symbols are combined to obtain a combined symbol, and the combined symbol is formed into a transmit signal. By adopting the embodiment of the invention, the system can obtain diversity gain, the terminal can obtain better SIC robustness, and in addition, the system can be scheduled in full bandwidth, thus being simple and convenient.

Example 2

This embodiment describes a multi-user information processing apparatus for implementing the method of embodiment 1, as shown in fig. 2, including a mixing module and an extension module, wherein:

When there are only 1 group, in an embodiment, the apparatus further includes a transmitting module, configured to form a transmission signal with the obtained i symbol sequences with the length of K, and send the transmission signal to a plurality of users in the i group.

When there are more than 2 groups, in another embodiment, the apparatus further includes a combining module, configured to combine the i symbol sequences with the length of K to obtain a combined symbol sequence.

Optionally, the apparatus further includes a transmitting module, configured to form a transmission signal from the combined symbol sequence, and send the transmission signal to a plurality of users.

The mixing module performs mixing processing on the user information of n users in the i group respectively, and may adopt one of the following modes:

the mixing module mixes the modulated user information of the n users in each group;

the mixing module mixes the user information of the n users in each group before modulation;

See example 1 for details of how to mix.

The above-mentioned sending module forms the symbol sequence into a transmission signal, including: the sending module maps the symbol sequence to time-frequency resources, where the time-frequency resources include multiple frequency-domain resources corresponding to the same time-domain resource, or the same frequency-domain resources corresponding to multiple different time-domain resources, or multiple frequency-domain resources corresponding to multiple different time-domain resources. Optionally, when the time-frequency resource includes a plurality of frequency-domain resources corresponding to the same time-domain resource, the sending module places the symbol sequence in a continuous bandwidth in a frequency domain, or in a distributed manner in the entire frequency band.

To emphasize the characteristics of the present invention, the following preferred exemplary application examples further illustrate the embodiments of the present invention. The UEs within different groups in the example herein are individually numbered, e.g., UE1 in the first group and UE1 in the fourth group are different UEs in fig. 3, as are UE2 in the first group and UE2 in the fourth group.

Application example 1

And respectively expanding the 4 mixed symbols by adopting 4 sequences to obtain 4 groups of expanded symbols, combining the 4 groups of expanded symbols to obtain combined symbols, forming a transmission signal by the transmitter from the combined symbols, and transmitting the transmission signal to a receiver. Fig. 3 shows the processing of multi-user information at the transmitter.

As shown in fig. 3, all user information in each group is coded and modulated, and a certain power is allocated to generate a user modulation symbol with a certain power, a mixed symbol is obtained after mixing, a spread symbol is obtained after spreading the mixed symbol, a combined symbol is obtained after combining the spread symbols, and the combined symbol forms a transmission signal to be transmitted. Each group includes two or more pieces of user information, and this example is only described as an example in which one group includes two pieces of user information. The number of sets may be one or more, and in this example, the number of sets is 4. The method comprises the following steps:

step 1, 1 bit information of the first group of UE is coded, modulated and allocated with certain power to obtain a user modulation symbol S11 with certain power. The 2 bit information of the first group of UE is coded, modulated and allocated with certain power to obtain a user modulation symbol S12 with certain power.

And 2, mixing S11 and S12 to obtain a mixed symbol. The S11 and S12 hybrid can be directly obtained by adding two symbols, denoted as S11+ S12. Fig. 4 is a diagram showing direct addition of one QPSK (quadrature phase shift keying) symbol and one 16QAM (quadrature amplitude modulation) symbol. The data shown in black in the figure are illustrated by randomly taking two specific cases, the first: the QPSK symbol at "01" and the 16QAM symbol at "1111" are directly added to obtain a symbol at "011111". And the second method comprises the following steps: the QPSK symbol at "11" and the 16QAM symbol at "0111" are directly added to obtain a symbol at "110111".

And 3, spreading the mixed symbols, wherein the spreading can be direct sequence spreading, frequency hopping spreading or time domain spreading.

Direct sequence spreading can be achieved as follows: after 4 mixed symbols are obtained, the spreading sequences used by the 4 groups of mixed symbols are 4 long sequences in a preset 4 × 4 spreading sequence set, where a 4 long sequence means that the sequence is composed of 4 symbols, the spreading sequence set may be, for example, a 4 × 4 hadamard matrix, where 1 row or one column may be used as one sequence, and each sequence has a length of 4. Each group uses 1 of the 4-long spreading sequences, each of which is different.

The purpose of adopting the spreading sequence to spread the mixed symbols is to enable the spread symbols to be spread more widely on time-frequency resources. The length K of the spreading sequence is not required. The spreading sequence may be a real sequence or a complex sequence, i sequences in the spreading sequence set may be the same or different, and if i sequences in the spreading sequence set are different, the i sequences may be mutually orthogonal sequences or non-orthogonal sequences.

The spreading sequence may spread one modulation symbol into a 4-long symbol sequence. As shown in fig. 5, each group of mixed symbols is spread with one sequence to generate a spread symbol sequence. For example, a spreading sequence { C11, C12, C13, C14} combines a set of symbols { S }_H1Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C11, C12, C13, C14} { S_H1Get another 4 long extended symbol sequence { C11S }_H1，C12*S_H1，C13*S_H1，C14*S_H1}. After the hybrid symbol is spread, the information or power of the hybrid symbol is divided into 4 symbols, or the hybrid symbol is carried on a 4-long spreading sequence.

The 4 groups of mixed symbols are all spread to obtain spread symbols, a spreading sequence { C21, C22, C23, C24} is used to spread a group of mixed symbols { S }_H2Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C21, C22, C23, C24} { S_H2Get another 4 long extended symbol sequence { C21S }_H2，C22*S_H2，C23*S_H2，C24*S_H2}; a spreading sequence { C31, C32, C33, C34} combines a set of mixed symbols { S_H3Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C31, C32, C33, C34} { S_H3Get another 4 long extended symbol sequence { C31S }_H3，C32*S_H3，C33*S_H3，C34*S_H3}; a spreading sequence { C41, C42, C43, C44} combines a set of mixed symbols { S_H4Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C41, C42, C43, C44} { S_H4Get another 4 long extended symbol sequence { C41S }_H4，C42*S_H4，C43*S_H4，C44*S_H4}。

And 4, combining the expanded symbol sequences to obtain a combined symbol sequence. Said combining comprises correspondingly adding 4 groups of the extended symbol sequences, i.e. the combined symbol comprises information of 4 groups of mixed symbolsMay be expressed as { C11S }_H1+C21*S_H2+C31*S_H3+C41*S_H4，C12*S_H1+C22*S_H2+C32*S_H3+C42*S_H4，C13*S_H1+C23*S_H2+C33*S_H3+C43*S_H4，C14*S_H1+C24*S_H2+C34*S_H3+C44*S_H4}。

And step 5, finally, the transmitter (such as a base station) forms a transmission signal by the combined symbol sequence and sends the transmission signal to a plurality of UE. And mapping the combined symbols to time-frequency resources, where the time-frequency resources include multiple frequency-domain resources (e.g., multiple frequency points at the same time) corresponding to the same time-domain resource, or the same frequency-domain resources (e.g., the same frequency points at multiple times) corresponding to multiple different time-domain resources, or multiple frequency-domain resources (e.g., multiple frequency points at multiple times) corresponding to multiple different time-domain resources. If the frequency domain resources correspond to the same time domain resource, the combined symbol can be placed in the frequency domain in a continuous bandwidth manner, or can be placed in a whole frequency band in a dispersed manner. When the information of 4 groups of mixed symbols is transmitted on the same time-frequency resource, a better effect can be obtained if i sequences in a spreading sequence set used for direct sequence spreading are orthogonal sequences.

Application example 2

And respectively expanding the 4 mixed symbols by adopting 4 sequences to obtain 4 groups of expanded symbols, combining the 4 groups of expanded symbols to obtain combined symbols, forming a transmission signal by the transmitter from the combined symbols, and transmitting the transmission signal to a receiver. Fig. 6 shows the processing of the multi-user information at the transmitter.

As shown in fig. 6, all user information in each group is encoded to obtain codeword bits, bit information of all users in each group is combined, then a certain power is allocated and modulated to obtain a mixed symbol, the mixed symbol is spread to obtain a spread symbol, the spread symbols are combined to obtain a combined symbol, and the combined symbol forms a transmission signal to be transmitted. Each group includes two or more pieces of user information, and this example is only described as an example in which one group includes two pieces of user information. The number of sets may be one or more, and in this example, the number of sets is 4. The method comprises the following steps:

step 1, coding the 1 bit information of the first group of UE to obtain the code word bit b₅b₄The 2 bit information of the first group of UE is coded to obtain the code word bit b₃b₂b₁b₀Combining the bit information of two users, or combining the bit information of two users together to form a group of bits b₅b₄b₃b₂b₁b₀. And allocating certain power and modulating to obtain a mixed symbol. The hybrid symbol in this example is a modulation symbol after combination of multi-user bit information. The number of codeword bits for UE1 and the number of codeword bits for UE2 are merely examples in this example.

Unlike application example 1, the information of the users in the group is not directly additively mixed together by modulation symbols, but is mixed together by means of bit combination. For example, two groups of bits are combined to form one group of high order bits and the other group of low order bits, for example, two bits of UE1 codeword bits and 4 bits of UE2 codeword bits are combined to form one group of 6 bits, where the codeword bits of UE1 are high order bits and the codeword bits of UE2 are low order bits.

Fig. 7 is a schematic diagram showing a group of two bits and a group of 4 bits combined and modulated. The data shown in black in the figure are illustrated by randomly taking two specific cases, the first: UE1 bit information "01" and UE2 bit information "0111" are merged to obtain a group of bits "010111"; and the second method comprises the following steps: the UE1 bit information "11" and the UE2 bit information "0111" are merged to obtain a group of bits "110111". The constellation diagram formed by all possible constellation points of the mixed symbol has gray mapping property by mapping and modulating the bit group '010111' and the bit group '110111' on the constellation diagram respectively, and so on.

And 2, expanding the mixed symbols, wherein direct sequence expansion is taken as an example for explanation in the example. After the 4 groups of mixed symbols are obtained, the spreading sequences used by the 4 groups of mixed symbols are 4 long sequences in a preset 4 × 4 spreading sequence set, where a 4 long sequence means that the sequence is composed of 4 symbols, the spreading sequence set may be, for example, a 4 × 4 hadamard matrix, where 1 row or one column may be used as one sequence, and each sequence has a length of 4. Each group uses 1 of the 4-long spreading sequences, each of which is different.

The length K of the spreading sequence is not required. The spreading sequence may be a real sequence or a complex sequence, i sequences in the spreading sequence set may be the same or different, and if i sequences in the spreading sequence set are different, the i sequences may be mutually orthogonal sequences or non-orthogonal sequences.

The spreading sequence may spread one modulation symbol into a 4-long symbol sequence. And each group of mixed symbols is subjected to expansion processing by using a sequence to generate an expanded symbol sequence. For example, a spreading sequence { C11, C12, C13, C14} combines a set of symbols { S }_H1Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C11, C12, C13, C14} { S_H1Get another 4 long extended symbol sequence { C11S }_H1，C12*S_H1，C13*S_H1，C14*S_H1}. After the hybrid symbol is spread, the information or power of the hybrid symbol is divided into 4 symbols, or the hybrid symbol is carried on a 4-long spreading sequence.

The 4 groups of mixed symbols are all spread to obtain spread symbols, a spreading sequence { C21, C22, C23, C24} is used to spread a group of mixed symbols { S }_H2Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C21, C22, C23, C24} { S_H2Get another 4 long extended symbol sequence { C21S }_H2，C22*S_H2，C23*S_H2，C24*S_H2}; a spreading sequence { C31, C32, C33, C34} combines a set of mixed symbols { S_H3Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C31, C32, C33, C34} { S_H3Get another 4 long extended symbol sequence { C31S }_H3，C32*S_H3，C33*S_H3，C34*S_H3}; a spreading sequence { C41, C42, C43, C44} combines a set of mixed symbols { S_H4Extension, mix symbols and one4 long spreading sequences, i.e. { C41, C42, C43, C44} { S }_H4Get another 4 long extended symbol sequence { C41S }_H4，C42*S_H4，C43*S_H4，C44*S_H4}。

And 3, combining the expanded symbol sequences to obtain a combined symbol sequence. The merging includes a corresponding addition of 4 groups of the extended symbol sequences, i.e. the merged symbol contains information of 4 groups of mixed symbols, which may be denoted as { C11 × S }_H1+C21*S_H2+C31*S_H3+C41*S_H4，C12*S_H1+C22*S_H2+C32*S_H3+C42*S_H4，C13*S_H1+C23*S_H2+C33*S_H3+C43*S_H4，C14*S_H1+C24*S_H2+C34*S_H3+C44*S_H4}。

And 4, finally, the transmitter forms a transmitting signal by the combined symbol sequence and sends the transmitting signal to a plurality of UE. And mapping the combined symbols to time-frequency resources, where the time-frequency resources include multiple frequency-domain resources (e.g., multiple frequency points at the same time) corresponding to the same time-domain resource, or the same frequency-domain resources (e.g., the same frequency points at multiple times) corresponding to multiple different time-domain resources, or multiple frequency-domain resources (e.g., multiple frequency points at multiple times) corresponding to multiple different time-domain resources. If the frequency domain resources correspond to the same time domain resource, the combined symbol can be placed in the frequency domain in a continuous bandwidth manner, or can be placed in a whole frequency band in a dispersed manner. When the information of 4 groups of mixed symbols is transmitted on the same time-frequency resource, a better effect can be obtained if i sequences in a spreading sequence set used for direct sequence spreading are orthogonal sequences.

Application example 3

And respectively expanding the 4 mixed symbols by adopting 4 sequences to obtain 4 groups of expanded symbols, combining the 4 groups of expanded symbols to obtain combined symbols, forming a transmission signal by the transmitter from the combined symbols, and transmitting the transmission signal to a receiver. Fig. 8 shows the processing of multi-user information at the transmitter.

As shown in fig. 8, all the user information in each group is encoded to obtain codeword bits, the codeword bits are subjected to bit xor operation before modulation, a certain power is distributed and modulated to obtain mixed symbols, the mixed symbols are expanded to obtain expanded symbols, the expanded symbols are combined to obtain combined symbols, and the combined symbols form a transmission signal to be transmitted. Each group includes two or more pieces of user information, and this example is only described as an example in which one group includes two pieces of user information. The number of sets may be one or more, and in this example, the number of sets is 4. The method comprises the following steps:

step 1, coding the 1 bit information of the first group of UE to obtain the code word bit b₅b₄The 2 bit information of the first group of UE is coded to obtain the code word bit b₃b₂b₁b₀，b₅b₄Is directly modulated to obtain a modulation symbol with a certain power, and b₃b₂b₁b₀Obtaining new information bit B by bit operation with the first group information bit₃B₂B₁B₀Then, the modulation symbol with certain power is obtained by modulating, and the modulation can be according to the modulation method adopted by the existing standard, for example: BPSK, QPSK, QAM.

In which the new information bits are composed of two parts, one part being b₃b₂b₁b₀2 bits and b₅b₄The two are calculated, and the other part is obtained by keeping the bits except the specific bit unchanged. I.e. new information bit B₃B₂B₁B₀First two digits of B₃B₂The first two bits b of the first group of information code word bits₅b₄And a specific 2 bits b of the second set of information codeword bits₃b₂XOR, the last two bits from b₃b₂b₁b₀Bit b other than the above specific bit₁b₀Is obtained by keeping the same. Besides the way of obtaining new user information by logical operation, other logical operation ways can be adopted as long as the obtained constellation diagram formed by all possible constellation points of the mixed symbol has gray mapping attribute.

Different from the application example 1, the information of the users in the group is not directly added and mixed together by the modulation symbols, but is mixed together by modifying the bit information of the UE2 by bit operation and then modulating and adding. A good property similar to the hybrid symbol in application example 2 can be achieved by this simple process, i.e. the constellation diagram made up of all possible constellation points has gray mapping properties.

And 2, expanding the mixed symbols, wherein direct sequence expansion is taken as an example for explanation in the example. After the 4 groups of mixed symbols are obtained, the spreading sequences used by the 4 groups of mixed symbols are 4 long sequences in a preset 4 × 4 spreading sequence set, where a 4 long sequence means that the sequence is composed of 4 symbols, the spreading sequence set may be, for example, a 4 × 4 hadamard matrix, where 1 row or one column may be used as one sequence, and each sequence has a length of 4. Each group uses 1 of 4 long spreading sequences, each of which is different.

All the 4 groups of mixed symbols are expanded to obtain expanded symbols, and one expansion is carried outThe spreading sequence { C21, C22, C23, C24} combines a set of mixed symbols { S_H2Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C21, C22, C23, C24} { S_H2Get another 4 long extended symbol sequence { C21S }_H2，C22*S_H2，C23*S_H2，C24*S_H2}; a spreading sequence { C31, C32, C33, C34} combines a set of mixed symbols { S_H3Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C31, C32, C33, C34} { S_H3Get another 4 long extended symbol sequence { C31S }_H3，C32*S_H3，C33*S_H3，C34*S_H3}; a spreading sequence { C41, C42, C43, C44} combines a set of mixed symbols { S_H4Spreading, multiplying the mixed symbol with a 4-long spreading sequence, i.e., { C41, C42, C43, C44} { S_H4Get another 4 long extended symbol sequence { C41S }_H4，C42*S_H4，C43*S_H4，C44*S_H4}。

And 3, combining the expanded symbol sequences to obtain a combined symbol sequence. The merging includes the corresponding addition of 4 groups of the extended symbol sequences, i.e. the merged symbol contains the information of 4 groups of the hybrid symbols, which can be expressed as { C11 × S_H1+C21*S_H2+C31*S_H3+C41*S_H4，C12*S_H1+C22*S_H2+C32*S_H3+C42*S_H4，C13*S_H1+C23*S_H2+C33*S_H3+C43*S_H4，C14*S_H1+C24*S_H2+C34*S_H3+C44*S_H4}。

It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module.

Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A multi-user information processing method, comprising:

respectively expanding the i mixed symbols by adopting i sequences with the length of K to obtain i symbol sequences with the length of K, wherein K is a positive integer; the mixing processing of the user information of the n users in the i group respectively includes: carrying out logic operation on the user information of the n users in each group before modulation, and mixing after modulation;

wherein, the logic operation is performed on the user information of n users in each group before modulation, and the user information is mixed after modulation, and the method comprises the following steps: after carrying out logic operation on part of bit information of n users in each group, modulating to obtain n user modulation symbols, adding the n user modulation symbols, and obtaining a constellation diagram consisting of all possible constellation points of a mixed symbol after adding, wherein the constellation diagram has a gray mapping attribute.

2. The method of claim 1, further comprising: and forming a transmitting signal by the obtained i symbol sequences with the length of K, and sending the transmitting signal to a plurality of users in the i group.

3. The method of claim 1, further comprising: and combining the i symbol sequences with the length of K to obtain combined symbol sequences.

4. The method of claim 3, further comprising: and forming a transmitting signal by the combined symbol sequence and sending the transmitting signal to a plurality of users.

5. The method of claim 1, wherein the performing logic operation on the partial bit information of the n users in each group comprises: and when n is 2, performing exclusive-or operation on the bit information of the first user and the partial bit information of the second user in each group, wherein the operation result is used as one part of the new bit information of the second user, and the partial bit information of the second user which is not subjected to logic operation is used as the other part of the new bit information of the second user.

6. The method according to any one of claims 1-5, wherein the i K long sequences satisfy one or more of the following conditions:

the i K long sequences comprise real sequences and/or complex sequences;

the i K long sequences are the same or different;

7. The method of claim 2 or 4, wherein said forming a sequence of symbols into a transmitted signal comprises:

8. The method of claim 7, wherein the time-frequency resource comprises a plurality of frequency-domain resources corresponding to a same time-domain resource, and wherein the symbol sequence is placed in a continuous bandwidth in a frequency domain or dispersed in an entire frequency band.

9. A multi-user information processing apparatus comprising a mixing module and an expansion module, wherein:

the expansion module is used for respectively expanding the i mixed symbols by adopting i sequences with the length of K to obtain i symbol sequences with the length of K, wherein K is a positive integer; the mixing processing of the user information of the n users in the i group respectively includes: carrying out logic operation on the user information of the n users in each group before modulation, and mixing after modulation;

10. The apparatus of claim 9, further comprising a transmitting module configured to form the i K long symbol sequences into a transmission signal, and send the transmission signal to a plurality of users in the i group.

11. The apparatus of claim 9, further comprising a combining module configured to combine the i K-long symbol sequences to obtain a combined symbol sequence.

12. The apparatus of claim 11, further comprising a transmitting module configured to form the combined symbol sequence into a transmission signal for transmission to a plurality of users.

13. The apparatus of claim 9, wherein the mixing module logically operates the partial bit information of the n users in each group, and comprises: and when n is 2, the mixing module performs exclusive-or operation on the bit information of the first user and the partial bit information of the second user in each group, the operation result is used as one part of the new bit information of the second user, and the partial bit information of the second user which is not subjected to logic operation is used as the other part of the new bit information of the second user.

14. The apparatus of any one of claims 9-13, wherein the i K long sequences satisfy one or more of the following conditions:

the i K long sequences comprise real sequences and/or complex sequences;

the i K long sequences are the same or different;

15. The apparatus of claim 10 or 12, wherein the means for transmitting forms the sequence of symbols into a transmission signal comprising:

16. The apparatus of claim 15, wherein the sending module places the symbol sequence in a contiguous bandwidth in a frequency domain or dispersed throughout a frequency band when the time-frequency resources include multiple frequency-domain resources corresponding to a same time-domain resource.