CN105827293B - A kind of linear force zero method for precoding of multi-user's generalized spatial modulation system - Google Patents
A kind of linear force zero method for precoding of multi-user's generalized spatial modulation system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0857—Joint weighting using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
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Abstract
The invention discloses a kind of linear force zero method for precoding of multi-user's generalized spatial modulation system, and this approach includes the following steps：Multi-user's generalized spatial modulation system is established, link transmitting terminal antenna is grouped, every group of transmission antenna serves a receiving terminal using generalized space modulation；To the channel gain matrix and transmission signal matrix progress dimensionality reduction in system, equivalent channel gain matrix and equivalent transmission signal matrix are obtained；Force zero precoding processing is carried out for the transmission signal matrix of transmitting terminal using the dimensionality reduction matrix, and carries out the transmission of signal using the equivalent channel gain matrix, to eliminate inter-user interference and interchannel interference simultaneously.The method of the present invention can effectively improve the error performance of system and the capacity of system.
Description
Technical field
The present invention relates to wireless communication fields, and in particular to a kind of linear force zero of multi-user's generalized spatial modulation system prelists
Code method.
Background technology
Space-modulation technique sends information by activating an antenna to be transmitted into row information in link transmitting terminal, by part and reflects
It is mapped on traditional digital modulation planisphere, remainder is mapped in the space dimension of antenna serial number generation, is efficiently solved
The problem of interchannel interference.Generalized space modulation technique can make link transmitting terminal activate two or more antennas, relieve
Spatial modulation link transmitting terminal antenna number must be the limitation of 2 power, while increase diversity gain, effectively improve
Spectrum efficiency, but it inevitably introduces channel disturbance.Force zero precoding technique is widely used in multiuser MIMO system
In system, it effectively eliminates the interference in lower link, improves power system capacity.
In the prior art, J.Wu et al. has studied the multi-user MIMO system precoding in conjunction with spatial modulation, passes through block pair
Angle pre-encode operation, the system equivalence are multiple parallel Single User MIMO systems, are eliminated in channel using spatial modulation
Portion interferes, and finally uses gradient descent algorithm, the power allocation factor of each user is updated, until error rate of system drops to most
It is low, obtain closed solutions.
After block diagonalization precoding processing, letter is eliminated by spatial modulation to multi-user MIMO system by J.Wu et al.
It is interfered between road, but this method is only applicable to Multi-User Dimension modulating system, i.e., only activation is sent in Single User MIMO system
Hold an antenna when special circumstances, for multi-user's generalized spatial modulation system, due to there are two or two with
On active antenna number, so interchannel interference still remains.If force zero precoding technique is directly applied to multi-user's broad sense
Spatial modulation system, since generalized inverse is not present in full rank, channel gain matrix to channel gain matrix, so multi-user's broad sense is empty
Between modulating system can not be directly using force zero method for precoding to eliminate interchannel interference.
Invention content
In order to solve the problems, such as that traditional force zero method for precoding can not be applied to multi-user's generalized spatial modulation system at present,
The present invention proposes a kind of linear force zero method for precoding applied to link under multi-user's generalized spatial modulation system.
The linear force zero method for precoding of a kind of multi-user's generalized spatial modulation system proposed by the present invention includes the following steps：
Multi-user's generalized spatial modulation system is established, link transmitting terminal antenna is grouped, every group of transmission antenna uses
A receiving terminal is served in generalized space modulation；
To the channel gain matrix and transmission signal matrix progress dimensionality reduction in multi-user's generalized spatial modulation system, obtain
To equivalent channel gain matrix and equivalent transmission signal matrix；
The equivalent transmission of multi-user's generalized spatial modulation system link transmitting terminal is believed using the dimensionality reduction matrix
Number matrix carries out force zero precoding processing, and using the transmission of equivalent channel gain matrix progress signal, to eliminate simultaneously
Inter-user interference and interchannel interference.
Linear force zero method for precoding proposed by the present invention applied to link under multi-user's generalized spatial modulation system leads to
It crosses to be grouped link transmitting terminal antenna and multi-user's generalized spatial modulation system is decomposed into many independent single user generalized spaces
Modulating system, it is assumed that reception antenna number and the activation antenna number of corresponding transmission antenna group of user under the same conditions, according to
Generalized space modulation generates dimensionality reduction matrix to reduce channel gain matrix and send signal matrix the characteristics of there are quiescent antennas
Dimension, obtained equivalent channel gain matrix and the equivalent signal matrix that sends believe the transmission information and channel status of active antenna
Breath extracts, and finally eliminates interference using the force zero method for precoding of channel reverse.The present invention passes through pre- in transmitting terminal application
Encoder matrix is handled sending signal matrix, and since inter-user interference and interchannel interference are eliminated, receiving terminal is using most
Will be more accurate for the detection of antenna serial number and transmission symbol when maximum-likelihood detection method or maximum merging are than detection method, institute
It can be all further enhanced with the error performance of system and power system capacity, wherein maximum merges passes through detection than detection method
Position judgment transmission antenna serial number where energy maximum symbol simultaneously rules out and corresponding sends bit；Maximum likelihood detection method
Antenna serial number can be detected simultaneously and sends symbol, it is found out by the method for exhaustion and receives the immediate bit information of signal, from Fig. 4
In it can be seen that it is maximum merge can obtain better error performance than detection method.
Description of the drawings
Fig. 1 is the stream that the present invention is applied to the linear force zero method for precoding of link under multi-user's generalized spatial modulation system
Cheng Tu.
Fig. 2 is the structure diagram for multi-user's generalized spatial modulation system that the present invention uses.
Fig. 3 is the rate capability analogous diagram using the method for the present invention.
Fig. 4 is the error performance analogous diagram using the method for the present invention.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
The present invention proposes a kind of linear force zero precoding side applied to link under multi-user's generalized spatial modulation system
Method is applied to multi-user's generalized spatial modulation system shown in Fig. 2.As shown in Figure 1, described be applied to multi-user's generalized space tune
The linear force zero method for precoding of link includes the following steps under system processed：
Step S1：Multi-user's generalized spatial modulation system is established, it will be in link under multi-user's generalized spatial modulation system
Transmitting terminal antenna is grouped, and every group of transmission antenna serves a specific user, i.e. receiving terminal using generalized space modulation；
For multi-user's generalized spatial modulation system, it is assumed that transmitting terminal known channel state information considers hair
Sending end base station possesses NtRoot transmission antenna, while K user is serviced, as shown in Figure 2.Assuming that user i ∈ 1 ..., and K } there is MiRoot day
Line, then reception antenna sum beIn multi-user's generalized spatial modulation system, Nr≤Nt.By NtRoot sends day
Line is divided into K groups, and every group of antenna serves a specific user using generalized space modulation, and the system equivalence is in multiple single users
Generalized spatial modulation system, it is assumed that each transmission antenna group possesses Nt/ K root antennas, i-th group of transmission antenna serve user i, use
The reception antenna number at family end is identical as activation antenna number in corresponding transmitting terminal antenna sets, activates antenna to exist in one group of transmission antenna
The symbolic information sent on each time slot is identical.
For above-mentioned multi-user's generalized spatial modulation system, the reception signal of receiving terminal is expressed as：Y=fHPx+n, f
For power confinement factor, H indicates Rayleigh flat fading channel gain matrix,It is the pre-coding matrix of transmitting terminal, x
It indicates to send signal, n indicates additive white Gaussian noise.
It is described to receive that signal is deployable to be：
Rayleigh flat fading channel H can be indicated with the form of block matrix：
SubmatrixRepresent the channel gain matrix between n-th group transmission antenna and user i；Indicate the reception signal of user i；x(i)It is the symbolic vector that i-th group of transmission antenna is sent,Wherein, Nu (i)
The active antenna number in i-th group of transmission antenna is represented,It indicates
The signal that jth root active antenna is sent out from i-th group of transmission antenna, sqIndicate q-th of symbol in M-QAM planispheres；Indicate the additive white Gaussian noise vector of user i.It enablesIndicate the transmission symbolic vector of base station,
MeetPTIt is the total emission power of base station, E [] expressions are averaged, | | | | Eucliden models are sought in expression
Number；The general power limitation of transmitting terminal can be expressed as：Tr(PPH)≤PT, Tr () expression ask mark to operate.
Step S2：According to the characteristic that generalized space is modulated, the channel in multi-user's generalized spatial modulation system is increased
Beneficial matrix and transmission signal matrix carry out dimensionality reduction, obtain equivalent channel gain matrix and equivalent transmission signal matrix；
In multi-user's generalized spatial modulation system, due to only having active antenna into row information transmission without being activated
Antenna is kept silent, so corresponding in the row and the signal x that is sent where corresponding to quiescent antenna in channel gain matrix H
Row where quiescent antenna is all null vector.For this feature, we will establish respectively reduces channel gain matrix H and transmission
The dimensionality reduction matrix of signal matrix x dimensionWithAssuming that the active antenna number in i-th group of transmission antenna
MiWith the reception antenna number N of i-th of useru (i)It is identical, i.e. Mi=Nu (i), consider to work as first not prelisting to sending signal
When code processing, the reception signal of receiving terminal is：
Wherein,The channel state information matrix row corresponding to jth root active antenna in i-th group of transmission antenna are represented,
Quiescent antenna is transmitted without information, and when the channel information for only considering activation antenna and when sending information, receiving signal can be into
One step is written as：
Then equivalent channel gain matrix and equivalent transmission signal matrix are respectively：
Thus P is obtained1Form be in l (lj, i) and row, theThe element of row is 1, remaining element is 0,
It is denoted asOther positions are 0, wherein l (lj, i) and represent jth root in i-th group of transmission antenna
The serial number of active antenna, Nu (k)Represent the active antenna number in kth group transmission antenna；It can obtain simultaneously：Other positions are 0, take pre-coding matrix P=P1P2P3, whereinAs
When force zero pre-coding matrix, the purpose for making channel gain matrix H and sending signal matrix x dimensionality reductions can be met.
Step S3：The equivalent transmission signal matrix of multi-user's generalized spatial modulation system link transmitting terminal is carried out
Force zero precoding processing, and using the transmission of equivalent channel gain matrix progress signal, so as to eliminate user simultaneously
Between interfere and interchannel interference.
In the step, it is P=P to take pre-coding matrix1P2P3,When, the reception signal of user can indicate
For：Wherein, it enablesExpression transmission channel etc.
Imitate channel gain matrix.For eliminate multi-user between and interchannel interference, using the equivalent channel gain matrixAnd
Using the force zero method for precoding of channel reverse, at this moment：It follows that using multi-user's generalized space
When modulating system force zero linear pre-coding method, the pre-coding matrix of base station transmitting terminal is expressed as：
Total transmission power of link transmitting terminal is PT, therefore the general power of link transmitting terminal is limited to Tr(PPH)=PT, can
It is to obtain power confinement factor：
Then the reception signal of u roots reception antenna is：
It is further described with reference to Fig. 2-4 pairs of effects of the invention.Referring in Fig. 3-4 use multi-user of the present invention
The rate and error performance analogous diagram of the linear force zero method for precoding of generalized spatial modulation system and multi-user shown in Fig. 2
Generalized spatial modulation system structure chart.The simulated environment of Fig. 3-4 is：Channel in multi-user's generalized spatial modulation system is flat
Ruili fading channel, noise are zero-mean additive white Gaussian noise, and number of users K=6, each group of antenna is all using 4-QAM broad sense
Modulating method, Nt/ M=7, activation antenna number are Nu (i)=2.In Fig. 3-4, MU-GSM and MU-GSM-ZF indicate do not have respectively
Using multi-user's generalized spatial modulation system of the linear force zero method for precoding of multi-user's generalized spatial modulation system and using more
Multi-user's generalized spatial modulation system of the linear force zero method for precoding of user's generalized spatial modulation system；MU-GSM-MRC and
MU-GSM-ML indicates to merge than multi-user's generalized spatial modulation system of detection method and using maximum likelihood using maximum respectively
Multi-user's generalized spatial modulation system of detection method；MU-GSM-ZF-MRC indicate to merge than detection method using maximum and
Using multi-user's generalized spatial modulation system of the linear force zero method for precoding of multi-user's generalized spatial modulation system；MU-GSM-
ZF-ML is indicated using maximum likelihood detection method and is applied the linear force zero method for precoding of multi-user's generalized spatial modulation system
Multi-user's generalized spatial modulation system, from Fig. 3-4 it is apparent that in same signal-to-noise ratio section, the present invention carries
The multi-user's generalized space modulation linearity force zero precoding gone out can make the rate of system and error performance be significantly improved, and
Better error performance can be obtained when merging than detection method using maximum compared to using maximum likelihood detection method.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
It describes in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the guarantor of the present invention
Within the scope of shield.
Claims (7)
1. a kind of linear force zero method for precoding of multi-user's generalized spatial modulation system, which is characterized in that the method includes with
Lower step：
Multi-user's generalized spatial modulation system is established, link transmitting terminal antenna is grouped, every group of transmission antenna uses broad sense
Spatial modulation serves a receiving terminal；
To the channel gain matrix and transmission signal matrix progress dimensionality reduction in multi-user's generalized spatial modulation system, obtain
Imitate channel gain matrix and equivalent transmission signal matrix, and corresponding dimensionality reduction matrix；
Using the dimensionality reduction matrix for multi-user's generalized spatial modulation system link transmitting terminal transmission signal matrix into
Row force zero precoding processing, and the transmission of signal is carried out using the equivalent channel gain matrix, it is done between user with eliminating simultaneously
It disturbs and interchannel interference；
In the channel gain matrix in multi-user's generalized spatial modulation system and send signal matrix progress dimensionality reduction
The step of in：
The row that correspond to according in multi-user's generalized spatial modulation system, in channel gain matrix where quiescent antenna and send letter
Row where corresponding to quiescent antenna in number is null vector, and structure is to channel gain matrix and sends signal matrix progress dimensionality reduction
Dimensionality reduction matrix P1And P3, dimensionality reduction matrix P1In l (lj, i) and rowThe element of row is 1, remaining element is 0, drop
Tie up matrix P3 Row l (lj, i) row element be 1, remaining element be 0, wherein l (lj, i) and represent i-th group
The serial number of jth root active antenna, N in transmission antennau (k)Represent the active antenna number in kth group transmission antenna, i=1 ..., K, K
For receiving terminal number, j=1 ..., Nu (i)。
2. according to the method described in claim 1, it is characterized in that, in multi-user's generalized spatial modulation system, receiving terminal
Reception antenna number it is identical as the activation antenna number in corresponding transmitting terminal antenna sets.
3. according to the method described in claim 1, it is characterized in that, in multi-user's generalized spatial modulation system, every group of hair
The symbolic information that the activation antenna of antennas is sent over each slot is identical.
4. according to the method described in claim 1, it is characterized in that, described for multi-user's generalized spatial modulation system
The transmission signal matrix of link transmitting terminal carried out in the step of force zero precoding processing, using pre-coding matrix P for equivalent hair
Signal matrix is sent to carry out force zero precoding processing, wherein pre-coding matrix It indicates
Equivalent channel gain matrix, H indicate Rayleigh flat fading channel gain matrix.
5. according to the method described in claim 4, it is characterized in that, for multi-user's generalized spatial modulation system link
The equivalent transmission signal matrix of transmitting terminal carries out force zero precoding processing, and carries out signal using the equivalent channel gain matrix
Transmission after, the reception signal of u root reception antennas is expressed as：
yu=fHPx+n,
Wherein, f is power confinement factor, and x indicates to send signal matrix, and n indicates additive white Gaussian noise.
6. according to the method described in claim 5, it is characterized in that, the power confinement factor f is expressed as：Wherein, PTFor total transmission power of transmitting terminal, Tr () expressions ask mark to operate.
7. according to the method described in claim 1, it is characterized in that, the receiving terminal merged than detection method using maximum or
Maximum likelihood detection method carries out signal detection.
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| CN105959045B (en) * | 2016-04-25 | 2019-10-18 | 郑州大学 | A kind of multi-user's generalized spatial modulation system phase adjustment linear pre-coding method |
| RU2720178C1 (en) * | 2017-01-26 | 2020-04-27 | Хуавэй Текнолоджиз Ко., Лтд. | Method of returning channel state information, a terminal device and a network device |
| CN108736932B (en) * | 2017-04-21 | 2020-08-07 | 展讯通信（上海）有限公司 | Linear decoding method and device, computer readable medium and terminal |
| CN111988069B (en) * | 2020-07-16 | 2021-11-26 | 东南大学 | Large-scale MIMO generalized eigenvector structure precoding solving method and device |
| CN111901023A (en) * | 2020-07-28 | 2020-11-06 | 电子科技大学 | Signal transmitting and receiving method in wireless communication system |
| CN112615653A (en) * | 2020-12-03 | 2021-04-06 | 国网河南省电力公司经济技术研究院 | Method for large-scale MU-MIMO combined optimization of system antenna number and transmission power |
| CN113225117A (en) * | 2021-04-27 | 2021-08-06 | 电子科技大学 | Multi-user Massive MIMO system signal transmitting and receiving method |
| CN116938290B (en) * | 2023-06-21 | 2024-05-31 | 西安工业大学 | MISO magnetic communication transmission method based on precoding in transmitting coil array |
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