CN105391481B - A kind of coding/decoding method for low complex degree in extensive antenna system - Google Patents
A kind of coding/decoding method for low complex degree in extensive antenna system Download PDFInfo
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- CN105391481B CN105391481B CN201510705308.0A CN201510705308A CN105391481B CN 105391481 B CN105391481 B CN 105391481B CN 201510705308 A CN201510705308 A CN 201510705308A CN 105391481 B CN105391481 B CN 105391481B
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
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Abstract
The invention discloses a kind of coding/decoding methods for low complex degree in extensive antenna system：One, designs send and receive signal；Two, decode input signal matrix X:1. estimating channel according to the training matrix Φ of transmission and corresponding reception signal Y0, estimate channel H, obtain estimation channel2. the information x of k-th of user in first of base station of data decoding solutionlkStep is：1st step：It enablesThen have2nd step：In mimo systems, when M is much larger than LK and M very big, haveIt enablesThen G approximate representations are3rd step：For the data information x of k-th of user in first given of base stationlk, coding/decoding method is4th step：The 1st to 3 step is decoded using the data of step 2, solves the data information of all users
Description
Technical field
The invention belongs to wireless communication technology field, more particularly to the extensive antenna skill of multiple cell multi-user that wirelessly communicates
A kind of application of art field, in particular to coding/decoding method of low complex degree in extensive antenna system.
Background technology
With the high speed development of wireless communication technique, traditional MIMO technology cannot meet people to transmitting without line number
According to requirement.Therefore, multi-user's multiple-input and multiple-output (MU-MIMO) wireless communication system has obtained widely applying, because it
It can ensure the rate and accuracy rate of wireless data transmission while the multiple users of multiple cells communicate simultaneously.However, MU-
Mimo wireless communication system is compared to traditional mimo system, and there is the randomness of channel state information and inter-cell users
Interference the problems such as.
Extensive antenna system (Massive MIMO) can just be such that system holds by directly increasing the number of antennas of base station
Amount increases, and when the number of antennas of base station is continuously increased very big, the channel between different user and base station tends to be orthogonal,
At this moment usually seriously affecting the interference of the minizone of entire communication system performance can ignore.Therefore, in extensive day
In linear system system, when the number of antennas of base station is very big, the interference of inter-cell user can be ignored, using a kind of more succinct direct
Coding/decoding method carries out data decoding, the purpose for reducing decoding complex degree may be implemented, and do not influence the performance of system.
Invention content
For the high deficiency of existing coding/decoding method complexity, the present invention proposes a kind of big for uplink multiple cell multi-user
The coding/decoding method of low complex degree in scale antenna system.
The present invention adopts the following technical scheme that：
A kind of coding/decoding method for low complex degree in extensive antenna system carries out as follows：
One, designs send and receive signal equation
It is assumed that system has L cell, for each cell there are one base station and K user, each base station is furnished with M root antennas, and
There are co-channel interferences between cell.It is assumed that k-th of user of first of cell first sends the training sequence that length is τ, i.e. Φlk=
(φlk,1,φlk,2,…,φlk,τ), wherein φlk,1,φlk,2,…,φlk,τ, k=1,2 ..., K are k-th of use of first of cell
Family respectively the 1,2nd ..., the training symbol that the τ moment sends.It enablesFor K × τ matrixes, Φ=(Φ1,
Φ2,…,ΦL)tFor the training matrix of LK × τ, subscript t indicates the transposition (the same below) of vector or matrix.Then sending length is
Τ1Information sequence, form input signal matrix X.Wherein X=[X1 … Xl … XL]t, Xl=[xl1 xl2 … xlK]tFor
The signal transmitted by user in first of base station, and each component xlk(1≤l≤L, 1≤k≤K) is independently derived from some
QAM (quadrature amplitude modulation signal).Assuming that reception signal corresponding with Φ and X is respectively in the 1st base station：
Wherein, H=[H1,…,Hl,…,HL], HlIndicate the user in first of base station to the 1st antenna for base station channel
Gain, it is clear that HlFor the matrix of M × K.B=diag [B1,…,Bl,…,BL], wherein BlFor the diagonal matrix of K × K, l is indicated
The weak factor of large scale of user in a base station to the 1st antenna for base station.In the present invention, Φ=[I is enabledK IK … IK]t,
Include L I in ΦK, each IKIndicate K ranks unit matrix (the same below), ρ0And ρ1It is signal-to-noise ratio, W0And W1Indicate Gauss white noise
Sound.
In order to reduce the decoding complex degree of system, the present invention proposes a kind of to input on the basis of estimating channel information H
The method that signal matrix X carries out low complex degree decoding.It is described in detail below：
Two, decode input signal matrix X
1. estimating channel
According to the training matrix Φ of transmission and corresponding reception signal Y0, estimate channel H with MMSE methods of estimation, can must estimate
Count channel
2. data decode
To solve the information x of kth (1≤k≤K) a user in a base station l (1≤l≤L)lkFor.The specific steps are：
Wherein, ()HThe complex-conjugate matrix (the same below) of representing matrix.
3rd step：For the data information x of kth (1≤k≤K) a user in given a base station l (1≤l≤L)lk,
Its coding/decoding method is
4th step：Utilize decoded 1st to 3 step of 2 data of above-mentioned steps, you can solve the data information of all users Complete the decoding to input signal matrix X.
For coding/decoding method proposed by the present invention compared with existing MMSE coding/decoding methods, system performance is close, but the present invention
Method decoding complex degree it is relatively low.
Description of the drawings
Fig. 1 is the analogous diagram about error rate of system under conditions of embodiment 1.
Specific implementation mode
It elaborates below in conjunction with the accompanying drawings to the preferred embodiment of the present invention.
Embodiment 1
Assuming that antenna number is M=128, L=3 cell, each cell has K=3 user, sends the training of τ=3 first
Then sequence retransmits T1=1 information sequence.B takes random diagonal matrix, and (first element is 1 on diagonal line, remaining element
For be arranged in order according to descending order 0 to 1 between random number).As follows：
One, designs send and receive signal equation
It is assumed that system has 3 cells, there are one base station and 3 users, each base stations to be furnished with 128 antennas for each cell,
And there are co-channel interferences between cell.It is assumed that k-th of user of first of cell first sends the training sequence that length is τ=3, so
It is Τ to send length afterwards1=1 information sequence forms input signal matrix X, and meets X=[X1 X2 X3]t, Xl=[xl1 xl2
xl3]t, wherein xlk(l=1,2,3, k=1,2,3) is taken from standard 4-QAM, transmitted by k-th of user in first of base station
Signal.Assuming that reception signal corresponding with Φ and X is respectively in the 1st base station：
Wherein, H=[H1 H2 H3], and H1, H2And H3It is 128 × 3 channel matrix.In the present invention, B takes random right
Angular moment battle array, enables Φl=I3(l=1,2,3), then training matrix Φ=[Φ1 Φ2 Φ3]t, dimension is 9 × 3, ρ0And ρ1It is letter
It makes an uproar and compares, W0And W1Indicate white Gaussian noise.
Two, decode input signal matrix X
1. estimating channel
According to the training matrix Φ of transmission and corresponding reception signal Y0, estimate channel H with MMSE methods of estimation, can must estimate
Count channel
2. data decode
To solve the information x of the 1st user in the 1st base station11For.The specific steps are：
3rd step：For the data information x of the 1st user in the 1st given base station11, coding/decoding method is
4th step：Utilize decoded 1st to 3 step of 2 data of above-mentioned steps, you can solve the data information of all users Complete the decoding to input signal matrix X.
As shown in Figure 1, being under conditions of above-described embodiment 1, about the analogous diagram of system average error rate, wherein " most
Small mean square error coding/decoding method-X1" indicate to decode the information x of 3 users of the 1st cell with general MMSE method11, x12With
x13Obtained average error rate curve, " coding/decoding method-X proposed by the present invention1" indicate to be decoded with method proposed by the present invention
The information x of 3 users of the 1st cell11, x12And x13Obtained average error rate curve.From figure 1 it appears that this hair
For the coding/decoding method of bright proposition compared with general MMSE coding/decoding methods, system performance is close, but method solution proposed by the present invention
Code complexity is relatively low.
The theoretical foundation of the design method is described below：
1. channel model
Remember that true channel is H, then for input signal matrix X, the signal model that the 1st base station receives can be denoted as：
Wherein, H indicates that the random matrix of M × LK, its each element are that mean value is 0, and the multiple Gauss that variance is 1 is random
Variable, and two-by-two independently of each other；Input signal matrix X is LK × T1Matrix, and send signal be all equably to be derived from certain
One standard QAM；B is diagonal matrix, is represented by B=diag [B1,…,Bl,…,BL], element B on diagonal linelFor pair of K × K
Angular moment battle array, indicate a base station l (1≤l≤L) in user to the 1st antenna for base station the weak factor of large scale；ρ0And ρ1It is
Signal-to-noise ratio；W0And W1It is M × τ and M × T respectively1Noise matrix, its each element be all mean value be 0, variance be 1 multiple height
This stochastic variable, and two-by-two independently of each other；Receiving terminal receives M × τ and M × T1Receipt signal matrix Y0And Y1。
2. decoding principle
For above system model, can be obtained by MMSE methods of estimation
Then Y1It is represented by
By approximate ML coding/decoding methods, can obtain
In mimo systems, when M is much larger than LK and M very big, haveThen have
Substitute into above-mentioned formula (1), (2), (3), then G can be further simplified as
Therefore, for the data information x of kth (1≤k≤K) a user in given a base station l (1≤l≤L)lk,
Need to only it consider when decoding and xlkRelated function item, then its coding/decoding method be
3. the advantages of directly decoding method
The complexity of general MMSE decodings is linear, and decoding complex degree is relatively low, but for extensive antenna
System, when antenna for base station number is continuously increased, GMMSEThe calculation amount of operator can be also continuously increased.The present invention is utilized extensive
In antenna system when number of antennas is very big, the channel of each user tends to orthogonal basic principle, it is proposed that a kind of directly to solve
The coding/decoding method of each user data information of code.Compared with general MMSE coding/decoding methods, coding/decoding method proposed by the present invention exists
While guarantee system decoding performance, but also the decoding complex degree of data greatly reduces.
Those skilled in the art are it should be appreciated that above example is only used for illustrating the present invention, and is not intended as pair
The restriction of the present invention, as long as within the scope of the invention, the variation to above example, deformation will all be fallen in protection model of the invention
It encloses.
Claims (1)
1. a kind of coding/decoding method for low complex degree in extensive antenna system carries out as follows：
One, designs send and receive signal
It is assumed that system has L cell, for each cell there are one base station and K user, each base station is furnished with M root antennas, and cell
Between there are co-channel interferences；It is assumed that k-th of user of first of cell first sends the training sequence that length is τ, i.e. Φlk=
(φlk,1,φlk,2,…,φlk,τ), wherein φlk,1,φlk,2,…,φlk,τ, k=1,2 ..., K are k-th of first of cell
User respectively the 1,2nd ..., the training symbol that the τ moment sends；It enablesFor K × τ matrixes, Φ=
(Φ1,Φ2,…,ΦL)tFor the training matrix of LK × τ, t indicates the transposition of vector or matrix；Then it is Τ to send length1Letter
Sequence is ceased, input signal matrix X is formed；Wherein X=[X1 … Xl … XL]t, Xl=[xl1 xl2 … xlK]tFor first of base
The signal transmitted by user in standing, and each component xlk, 1≤l≤L, 1≤k≤K is independently derived from some QAM；It is false
If reception signal corresponding with Φ and X is respectively in the 1st base station：
Wherein, H=[H1,…,Hl,…,HL], HlIndicate the user in first of base station to the 1st antenna for base station channel gain,
HlFor the matrix of M × K；B=diag [B1,…,Bl,…,BL], wherein BlFor the diagonal matrix of K × K, indicate in first of base station
User to the 1st antenna for base station the weak factor of large scale；In the present invention, Φ=[I is enabledK IK … IK]t, include in Φ
L IK, each IKIndicate K rank unit matrix；ρ0And ρ1It is signal-to-noise ratio；W0And W1Indicate white Gaussian noise；
Two, decode input signal matrix X
1. estimating channel
According to the training matrix Φ of transmission and corresponding reception signal Y0, estimate channel H, obtain estimation channel
Wherein it is the matrix of M × LK；It enablesFor the matrix of M × K；
2. data decode
Solve l, 1≤l≤L, the kth in a base station, 1≤k≤K, the information x of a userlkStep is：
1st step：It enablesThen have
Wherein, ()HThe complex-conjugate matrix of representing matrix；
2nd step：In mimo systems, when M is much larger than LK and M very big, there is order
Bl=diag [βl1 … βlk … βlK], then G approximate representations are
3rd step：For given l, 1≤l≤L, the kth in a base station, 1≤k≤K, the data information x of a userlk, decoding
Method is
4th step：Using decoded 1st to 3 step of step 2 data, the data information of all users is solved1≤l≤L,1≤k≤
K completes the decoding to input signal matrix X.
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| US7940864B2 (en) * | 2008-04-28 | 2011-05-10 | Newport Media, Inc. | Channel estimation for high doppler mobile environments |
| CN102291166A (en) * | 2011-07-13 | 2011-12-21 | 中国科学技术大学 | Precoding method for minimum mean square error in multi-user multi-input multi-output system |
| CN102882655A (en) * | 2012-10-29 | 2013-01-16 | 北京邮电大学 | Base station and user combined transmission method of multi-antenna system based on network code |
| CN103117839A (en) * | 2013-03-14 | 2013-05-22 | 中国科学技术大学 | Pre-coding method under non-accurate channel information of multi-user multiple-input-multiple-output system |
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