CN113489510B - Large-scale MU-MIMO system DBP architecture signal detection method based on user grouping - Google Patents

Large-scale MU-MIMO system DBP architecture signal detection method based on user grouping Download PDF

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CN113489510B
CN113489510B CN202110930486.9A CN202110930486A CN113489510B CN 113489510 B CN113489510 B CN 113489510B CN 202110930486 A CN202110930486 A CN 202110930486A CN 113489510 B CN113489510 B CN 113489510B
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user
antenna
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CN113489510A (en
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戴晓明
李华
罗裕全
闫甜甜
马心阳
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University of Science and Technology Beijing USTB
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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
    • H04B7/0413—MIMO systems
    • H04B7/0452—Multi-user MIMO systems
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    • H04L25/0202—Channel estimation
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
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Abstract

The invention provides a large-scale MU-MIMO system DBP architecture signal detection method based on user grouping, and belongs to the technical field of communication. The method comprises the following steps: aiming at a large-scale MU-MIMO system DBP framework, a base station antenna is divided into a plurality of antenna clusters, users are divided into a plurality of user groups, each antenna cluster independently and parallelly detects signals sent by each user group, and detected local information is sent to a central processing unit, wherein the detected local information comprises: characteristic information of a transmission signal of each user group; the central processing unit combines the local information of the antenna cluster based on the message mixing strategy and estimates the sending signals of each user group. By adopting the invention, the problem of serious performance reduction caused by the increase of the number of antenna clusters and the limitation of global information sharing in the traditional distributed signal detection algorithm based on the DBP framework can be obviously improved.

Description

Large-scale MU-MIMO system DBP architecture signal detection method based on user grouping
Technical Field
The invention relates to the technical field of communication, in particular to a DBP (direct bus protocol) architecture signal detection method of a large-scale MU-MIMO (multi-user multiple input multiple output) system based on user grouping.
Background
In a large-scale Multi-user Multiple-Input Multiple-Output (MU-MIMO) system, hundreds of antennas are assembled on a base station, and tens of users in the same frequency band are served simultaneously, so that the frequency spectrum efficiency and the energy efficiency are improved by one order of magnitude. The existing large-scale MU-MIMO system usually adopts a centralized baseband signal processing mode, and massive data needs to be transmitted from a radio frequency unit of a base station to a baseband processing unit. For example, in a 128-antenna massive MIMO system, employing a 10-bit analog-to-digital converter and operating at a 40MHz bandwidth, the raw baseband data rate exceeds 200 Gbps. Such high data rates exceed the bandwidth of existing high-speed interconnect standards (e.g., common public wireless interfaces) and reach the bandwidth and power consumption limits of existing chip input/output interfaces. Furthermore, existing detection algorithms are typically centralized at the base station, resulting in extremely high data transmission rates and computational complexity.
In the prior art, a Decentralized Baseband Processing (DBP) architecture (as shown in fig. 1) is proposed to alleviate bandwidth and computation bottleneck of centralized Baseband Processing, and a base station antenna is divided into a plurality of antenna clusters, where each antenna cluster includes a local rf circuit, a channel estimator, a signal detector and an associated computation unit, and performs signal Processing independently and in parallel, and transmits local information of each cluster to a central Processing unit. The centralized processing unit combines the messages according to a certain message mixing rule and further obtains an estimated symbol. Existing DBP-based signal detection algorithms, such as minimum mean-square error (MMSE), zero-forcing (ZF), and approximate message passing (LAMA) detection algorithms, typically use two message mixing approaches in the central processing unit: one is a hybrid matched filter output; one is to take the error variance after equalization as the weight to carry out weighted summation to the estimated symbol of each antenna cluster.
The traditional de-centralization detection algorithm based on the DBP is high in complexity, the performance loss of the detection algorithm is serious along with the increase of the number of antenna clusters, the performance loss problem caused by global shared information limitation due to the antenna clusters is not fully considered although the bottleneck problems of ultrahigh data transmission and chip bandwidth are solved by adopting the DBP framework, and therefore a low-complexity and high-efficiency distributed signal detection algorithm needs to be designed.
Disclosure of Invention
The embodiment of the invention provides a DBP framework signal detection method of a large-scale MU-MIMO system based on user grouping, which can obviously improve the problem of serious performance reduction of the traditional DBP framework-based distributed signal detection algorithm caused by the increase of the number of clusters and the limitation of global information sharing. The technical scheme is as follows:
the embodiment of the invention provides a large-scale MU-MIMO system DBP architecture signal detection method based on user grouping, which comprises the following steps:
aiming at a large-scale MU-MIMO system DBP framework, a base station antenna is divided into a plurality of antenna clusters, users are divided into a plurality of user groups, each antenna cluster independently and parallelly detects signals sent by each user group, and detected local information is sent to a central processing unit, wherein the detected local information comprises: characteristic information of a transmission signal of each user group;
the central processing unit combines the local information of the antenna cluster based on the message mixing strategy and estimates the sending signals of each user group.
Further, for the large-scale MU-MIMO system DBP architecture, dividing the base station antenna into multiple antenna clusters, dividing the users into multiple user groups, and performing independent and parallel detection on signals sent by each user group for each antenna cluster includes:
aiming at a DBP (direct bus) architecture of a large-scale MU-MIMO (multiple user-multiple input multiple output) system, a large-scale antenna configured by a base station is divided into C antenna clusters, and each antenna cluster comprises N c The antenna, the base station received signal vector y and the noise vector n are divided into
Figure BDA0003211141010000021
And
Figure BDA0003211141010000022
channel matrix H is divided into based on rows
Figure BDA0003211141010000023
Wherein, y c For the received signal of the c-th cluster, n c Noise representing cluster c, H c Representing a channel matrix of the c-th cluster, and a superscript T representing a matrix transposition;
dividing users into G user groups;
dividing the channel matrix of each antenna cluster into H by columns c ＝[H c,1 ,…,H c,g ,…,H c,G ]Then y is c Expressed as:
Figure BDA0003211141010000024
wherein H c,g Channel matrix, x, representing the g user group in the c cluster g A signal transmitted for a g-th user group;
and each antenna cluster carries out independent and parallel signal detection, wherein the signal detection algorithm comprises the following steps: a linear detection algorithm or a non-linear message passing algorithm.
Further, the nonlinear message passing algorithm is a message passing algorithm based on expected value propagation, and the message update rule of the message passing algorithm based on expected value propagation is as follows:
Figure BDA0003211141010000031
Figure BDA0003211141010000032
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003211141010000033
and
Figure BDA0003211141010000034
respectively representing VNx at the time of the t-th iteration within the c-th cluster g To FN f c,n And messages passed in the reverse direction, VN representing variable nodes, FN representing functional nodes,
Figure BDA0003211141010000035
in order to be the a-priori information,
Figure BDA0003211141010000036
represents each group K g Joint constellation symbol vector set, K, for individual users g For each group of users, x \ x g Denotes x divided by x g Other transmitted signals, p (y) c,n ∣x g ) Representing a likelihood function.
Further, the characteristic information of the transmission signal includes: a covariance matrix and a mean vector;
assuming that the transmitted signal x is a continuous random gaussian vector and the message transmitted between VN and FN is approximated as a multivariate gaussian distribution, the characteristics of the transmitted message are characterized by covariance and mean, and the computation rule of the covariance matrix and mean vector is expressed as:
Figure BDA0003211141010000037
Figure BDA0003211141010000038
wherein the content of the first and second substances,
Figure BDA0003211141010000039
and
Figure BDA00032111410100000310
respectively representing the g user group VNx at the t iteration g To FNf c,n The upper scale H denotes the conjugate transpose, e c,n Express identity matrix
Figure BDA00032111410100000322
N of (1) c Indicates the number of antennas in each antenna cluster,
Figure BDA00032111410100000311
and
Figure BDA00032111410100000312
the mean vector and covariance matrix of the approximate posterior distribution obtained for the moment matching respectively,
Figure BDA00032111410100000313
and
Figure BDA00032111410100000314
respectively represent the t-1 th iterationTime of day FNf c,n Delivery to the g-th user group VNx g Mean and variance of.
Further, the mean vector of the approximate posterior distribution obtained by the moment matching
Figure BDA00032111410100000315
Sum covariance matrix
Figure BDA00032111410100000316
Respectively expressed as:
Figure BDA00032111410100000317
Figure BDA00032111410100000318
wherein the content of the first and second substances,
Figure BDA00032111410100000319
x is the t-th iteration time in the c-th cluster g The confidence of,
Figure BDA00032111410100000320
Is expressed at a confidence level of
Figure BDA00032111410100000321
Mean of time-variant.
Further, assuming that the transmitted signal x is a continuous random gaussian vector and the information between VN and FN is approximated as a multivariate gaussian distribution, the mean and variance of the FN delivered to VN are expressed as:
Figure BDA0003211141010000041
Figure BDA0003211141010000042
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0003211141010000043
and
Figure BDA0003211141010000044
respectively representing FNf times of the t-th iteration c,n Delivery to the g-th user group VNx g Mean and variance of H c,g′ A channel matrix representing the g' th user group of the c-th cluster,
Figure BDA0003211141010000045
and
Figure BDA0003211141010000046
respectively representing the g' th user group VNx at the t-th iteration g′ To FNf c,n The covariance matrix and the mean vector of (a),
Figure BDA0003211141010000047
is the variance of gaussian noise.
Further, the central processing unit combines the local information of the antenna cluster based on the message mixing strategy, and estimates the transmission signal of each user group includes:
the central processing unit combines the local information of each antenna cluster based on a multidimensional Gaussian multiplication message mixing strategy;
calculating the posterior probability of the signals sent by each user group according to the combined information;
and estimating the signals transmitted by each user group according to the obtained posterior probability of each group of user transmission signals.
Further, the merged global information α (x) g ) Is approximated as a covariance matrix of
Figure BDA0003211141010000048
Mean value vector of
Figure BDA0003211141010000049
Gaussian distribution of
Figure BDA00032111410100000410
Expressed as:
Figure BDA00032111410100000411
wherein the content of the first and second substances,
Figure BDA00032111410100000412
Figure BDA00032111410100000413
respectively representing the mean vector and covariance matrix for each user group when the maximum number of iterations is reached.
Further, the posterior probability of each user group sending signal is:
Figure BDA00032111410100000414
where ξ is the vector composed of the constellation symbols sent by each user group,
Figure BDA00032111410100000418
a set of constellation diagrams is represented,
Figure BDA00032111410100000415
represents each group K g Joint constellation vector set, β (x), for individual users g ξ) represents x g Global confidence in ξ, p (x) g ξ) represents x g A priori of (a), (b), (c), (d), (x) g ξ) represents x g Global information in ξ.
Further, the estimated signals transmitted by each user group are:
Figure BDA00032111410100000416
wherein the content of the first and second substances,
Figure BDA00032111410100000417
representation estimationThe counted g-th user group.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
in the embodiment of the invention, aiming at a DBP (direct bus protocol) framework of a large-scale MU-MIMO (multi-user multiple input multiple output) system, firstly, a base station antenna is divided into a plurality of antenna clusters, users are divided into a plurality of user groups, and each antenna cluster independently and parallelly detects signals sent by each user group; then, sending the detected local information to a central processing unit, wherein the detected local information comprises: characteristic information of a transmission signal of each user group; and finally, the central processing unit merges the local information of each antenna cluster based on a message mixing strategy and estimates the sending signals of each user group. By adopting the method and the device, the problem of serious performance reduction caused by the DBP architecture-based detection performance of the traditional large-scale MU-MIMO system along with the increase of the number of clusters and the limitation of global information sharing can be obviously improved.
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In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a block diagram of a DBP architecture receiving end system;
fig. 2 is a schematic flowchart of a method for detecting DBP architecture signals of a large-scale MU-MIMO system based on user grouping according to an embodiment of the present invention;
fig. 3 is a factor graph of an EP detection algorithm based on user grouping according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting a DBP architecture signal of a large-scale MU-MIMO system based on user grouping, including:
s101, aiming at a large-scale MU-MIMO system DBP framework, dividing a base station antenna into a plurality of antenna clusters, dividing a user into a plurality of user groups, independently and parallelly detecting signals sent by each user group by each antenna cluster, and sending detected local information to a central processing unit, wherein the detected local information comprises: characteristic information of a transmission signal of each user group;
s102, the central processing unit combines the local information of the antenna cluster based on the message mixing strategy and estimates the sending signals of all user groups.
Aiming at the DBP architecture of the large-scale MU-MIMO system, firstly, dividing a base station antenna into a plurality of antenna clusters, dividing a user into a plurality of user groups, and independently and parallelly detecting signals sent by the user groups by each antenna cluster; then, sending the detected local information to a central processing unit, wherein the detected local information comprises: characteristic information of a transmission signal of each user group; and finally, the central processing unit merges the local information of each antenna cluster based on a message mixing strategy and estimates the sending signal of each user group. By adopting the method and the device, the problem of serious performance reduction caused by the DBP architecture-based detection performance of the traditional large-scale MU-MIMO system along with the increase of the number of antenna clusters and the limitation of global information sharing can be obviously improved.
As shown in fig. 1, a DBP architecture receiving end system in this embodiment transmits information to a base station equipped with N antennas by K single-antenna users in the same time-frequency resource. The source bit sequence transmitted by user enters into the interleaver after channel coding, every Q coded bits are modulated into a complex constellation point with energy normalization (the constellation set is
Figure BDA0003211141010000061
And is
Figure BDA0003211141010000062
). All users' transmitted signals (vector in nature)
Figure BDA0003211141010000063
Can be expressed as x ═ x 1 ,x 2 ,…,x K ] T Then, the complex baseband input-output model of the massive MU-MIMO system can be expressed as:
y＝Hx+n
wherein the content of the first and second substances,
Figure BDA0003211141010000064
a received signal vector representing a dimension of the base station side as Nx 1;
Figure BDA0003211141010000065
representing a rayleigh flat fading channel matrix, wherein each element of the channel matrix obeys a complex gaussian distribution with a mean value of zero and a variance of 1;
Figure BDA0003211141010000066
representing additive white Gaussian noise vector, the elements of which are independent and identically distributed circularly symmetric complex Gaussian random variables, the mean value of which is 0, and the variance of which is sigma 2 。
In a specific implementation manner of the foregoing large-scale MU-MIMO system DBP architecture signal detection method based on user grouping, further, for the large-scale MU-MIMO system DBP architecture, dividing a base station antenna into a plurality of antenna clusters, dividing a user into a plurality of user groups, where each antenna cluster independently and parallelly detects a signal sent by each user group includes:
a1, for DBP architecture of large-scale MU-MIMO system, dividing large-scale antennas into C antenna clusters at base station end, assuming the number of antennas in each antenna cluster is the same and N c The base station receiving signal vector y and the noise vector n are respectively divided into
Figure BDA0003211141010000067
And
Figure BDA0003211141010000068
channel matrix H is divided into based on rows
Figure BDA0003211141010000069
Wherein, y c For the received signal of the c-th antenna cluster (c-th cluster for short), n c Noise representing cluster c, H c Representing a channel matrix of the c-th cluster, and a superscript T representing a matrix transposition;
in this embodiment, when the number of antennas is greater than or equal to 64, the antenna may be referred to as a large-scale antenna.
A2, dividing users into G user groups, wherein the number of each user group is K g ；
A3, dividing the channel matrix of each antenna cluster into H by columns c ＝[H c,1 ,…,H c,g ,…,H c,G ]Then y is c Expressed as:
Figure BDA00032111410100000610
wherein the content of the first and second substances,
Figure BDA0003211141010000071
a channel matrix representing the g user group of the c-th cluster,
Figure BDA0003211141010000072
a transmission signal for the g-th user group;
a4, performing independent and parallel signal detection on each antenna cluster, where the signal detection algorithm may adopt a linear detection algorithm, such as a minimum mean square error algorithm, or may also adopt a non-linear algorithm, such as a Message Passing Algorithm (MPA), and specifically may be: message passing algorithms based on expected value propagation, other algorithms are also possible in practical applications.
It should be noted that different algorithms have different local information expression forms, such as covariance matrix, mean vector, and gray matrix, and the local information generated by different algorithms is different.
The present embodiment takes an MPA detection algorithm based on Expected Propagation (EP) as an example to describe the signal detection process of each antenna cluster.
In this embodiment, when the EP-based MPA detection scheme is used to perform signal detection, the obtained local information (i.e., the characteristic information of the transmission signal) includes: a covariance matrix and a mean vector; an EP-based MPA detection scheme may be represented by a factor graph shown in fig. 3, where N is 8, K is 4, C is 2, and G is 2, and the message update rule of EP-based MPA is as follows:
Figure BDA0003211141010000073
Figure BDA0003211141010000074
wherein the content of the first and second substances,
Figure BDA0003211141010000075
and
Figure BDA0003211141010000076
respectively representing Variable Node (VN) x at the t iteration in the c cluster g To Function Node (FN) f c,n And a message to be delivered in the reverse direction,
Figure BDA0003211141010000077
in order to be a priori information,
Figure BDA0003211141010000078
represents each group K g Joint constellation symbol vector set, K, for individual users g For each group of users, x \ x g Denotes x divides x g Other than the transmitted signal, p (y) c,n ∣x g ) Representing a likelihood function, defining a maximum number of iterations as T max Generally, take T max ＝6。
According to the characteristics of the EP algorithm, assuming that the transmitted signal x is a continuous random gaussian vector and the message transmitted between VN and FN is approximated to a multivariate gaussian distribution, the characteristics of the transmitted message can be characterized by covariance and mean, and the computation rule of the covariance matrix and mean vector is expressed as:
Figure BDA0003211141010000079
Figure BDA00032111410100000710
wherein the content of the first and second substances,
Figure BDA0003211141010000081
and
Figure BDA0003211141010000082
respectively representing the g user group VNx at the t iteration g To FNf c,n The upper scale H denotes the conjugate transpose, e c,n Express identity matrix
Figure BDA0003211141010000083
N of (1) c Indicating the number of antennas in each antenna cluster,
Figure BDA0003211141010000084
and
Figure BDA0003211141010000085
the mean vector and covariance matrix of the approximate posterior distribution obtained for the moment matching respectively,
Figure BDA0003211141010000086
and
Figure BDA0003211141010000087
FNf at the t-1 th iteration c,n Delivery to the g-th user group VNx g Mean and variance of; wherein the mean vector of the approximate posterior distribution obtained by the moment matching
Figure BDA0003211141010000088
Sum covariance matrix
Figure BDA0003211141010000089
Respectively expressed as:
Figure BDA00032111410100000810
Figure BDA00032111410100000811
wherein the content of the first and second substances,
Figure BDA00032111410100000812
for the t-th iteration x in the c-th antenna cluster g The confidence of,
Figure BDA00032111410100000813
Is expressed at a confidence level of
Figure BDA00032111410100000814
Mean of time-variant.
The mean and variance of FN delivery to VN are expressed as:
Figure BDA00032111410100000815
Figure BDA00032111410100000816
wherein the content of the first and second substances,
Figure BDA00032111410100000817
and
Figure BDA00032111410100000818
respectively representing FNf times of the t-th iteration c,n Delivery to the g-th user group VNx g Mean and variance of H c,g′ A channel matrix representing the g' th user group of the c-th cluster,
Figure BDA00032111410100000819
and
Figure BDA00032111410100000820
respectively representing the g' th user group VNx at the t-th iteration g′ To FNf c,n The covariance matrix and the mean vector of (a),
Figure BDA00032111410100000821
is the variance of gaussian noise.
When the detection is finished, namely: detecting each antenna cluster to reach the maximum iteration number T max The covariance matrix of each user group detected by each antenna cluster is determined
Figure BDA00032111410100000822
Sum mean vector
Figure BDA00032111410100000823
And sending the data to a central processing unit.
In a specific implementation manner of the foregoing method for detecting a DBP architecture signal of a large-scale MU-MIMO system based on user grouping, further, the merging, by the central processing unit, local information of an antenna cluster and estimating a signal sent by each user group based on a multidimensional gaussian-multiplied message mixing strategy includes:
b1, the central processing unit combines the local information of each antenna cluster based on the multidimensional Gaussian multiplied message mixing strategy;
in this embodiment, at a merge Node (Sum Node, SN), the merged global information α (x) g ) Approximately obey a covariance matrix of
Figure BDA00032111410100000824
Mean value vector of
Figure BDA00032111410100000825
Gaussian distribution of
Figure BDA00032111410100000826
Expressed as:
Figure BDA00032111410100000827
wherein the content of the first and second substances,
Figure BDA00032111410100000828
b2, calculating the posterior probability of the signals sent by each user group according to the merged information;
in this embodiment, the posterior probability of the signal sent by each user group is:
Figure BDA0003211141010000091
where ξ is the constellation symbol vector sent by each user group,
Figure BDA0003211141010000092
a set of constellation diagrams is represented,
Figure BDA0003211141010000093
represents each group K g Set of joint constellation symbol vectors, β (x), for individual users g ξ) represents x g Global confidence in ξ, p (x) g ξ) denotes the prior probability, α (x) g ξ) represents x g Global information in ξ.
And B3, estimating the signals transmitted by each user group according to the obtained posterior probability of each user transmitted signal.
In this embodiment, the estimated signals sent by each user group are:
Figure BDA0003211141010000094
wherein the content of the first and second substances,
Figure BDA0003211141010000095
indicating the estimated transmission signal of the g-th user group.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (6)

1. A large-scale MU-MIMO system DBP architecture signal detection method based on user grouping is characterized by comprising the following steps:
aiming at a large-scale MU-MIMO system DBP framework, a base station antenna is divided into a plurality of antenna clusters, users are divided into a plurality of user groups, each antenna cluster independently and parallelly detects signals sent by each user group, and detected local information is sent to a central processing unit, wherein the detected local information comprises: characteristic information of a transmission signal of each user group;
the central processing unit combines local information of the antenna cluster based on a message mixing strategy and estimates a sending signal of each user group;
the method for detecting the signals sent by the user groups in the large-scale MU-MIMO system DBP architecture includes the following steps that for the large-scale MU-MIMO system DBP architecture, base station antennas are divided into a plurality of antenna clusters, users are divided into a plurality of user groups, and each antenna cluster independently and parallelly detects the signals sent by each user group:
aiming at a DBP (direct bus protocol) framework of a large-scale MU-MIMO (multiple user-multiple input multiple output) system, large-scale antennas configured by a base station are divided into C antenna clusters, and each antenna cluster comprises N c The antenna, the base station received signal vector y and the noise vector n are respectively divided into
Figure FDA0003637792030000011
And
Figure FDA0003637792030000012
channel matrix H is divided into based on rows
Figure FDA0003637792030000013
Wherein, y c For the received signal of the c-th cluster, n c Noise representing cluster c, H c Representing a channel matrix of the c-th cluster, and a superscript T representing a matrix transposition;
dividing users into G user groups;
dividing the channel matrix of each antenna cluster into H by columns c ＝[H c,1 ,…,H c,g ,…,H c,G ]Then y is c Expressed as:
Figure FDA0003637792030000014
wherein H c,g Channel matrix, x, representing the g user group in the c cluster g A signal transmitted for a g-th user group;
and each antenna cluster carries out independent and parallel signal detection, wherein the signal detection algorithm comprises the following steps: a linear detection algorithm or a non-linear message passing algorithm;
wherein the characteristic information of the transmission signal includes: a covariance matrix and a mean vector;
assuming that the transmitted signal x is a continuous random gaussian vector and the message transmitted between VN and FN is approximated as a multivariate gaussian distribution, the characteristics of the transmitted message are characterized by covariance and mean, and the computation rule of the covariance matrix and mean vector is expressed as:
Figure FDA0003637792030000015
Figure FDA0003637792030000021
wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003637792030000022
and
Figure FDA0003637792030000023
respectively representing the g user group VNx at the t iteration g To FNf c,n The upper scale H denotes the conjugate transpose, e c,n Express identity matrix
Figure FDA0003637792030000024
N of (1) c Indicating the number of antennas in each antenna cluster,
Figure FDA0003637792030000025
and
Figure FDA0003637792030000026
the mean vector and covariance matrix of the approximate posterior distribution obtained for the moment matching respectively,
Figure FDA0003637792030000027
and
Figure FDA0003637792030000028
FNf at the t-1 th iteration c,n Delivery to the g-th user group VNx g The mean and variance of (c);
wherein the mean vector of the approximate posterior distribution obtained by the moment matching
Figure FDA0003637792030000029
Sum covariance matrix
Figure FDA00036377920300000210
Respectively expressed as:
Figure FDA00036377920300000211
Figure FDA00036377920300000212
wherein the content of the first and second substances,
Figure FDA00036377920300000213
x is the t iteration time in the c cluster g The confidence of,
Figure FDA00036377920300000214
Is expressed at a confidence level of
Figure FDA00036377920300000215
The mean of the time-varying variables;
wherein, assuming that the transmitted signal x is a continuous random gaussian vector and the information between VN and FN is approximated as a multivariate gaussian distribution, the mean and variance of the FN delivered to VN are respectively expressed as:
Figure FDA00036377920300000216
Figure FDA00036377920300000217
wherein the content of the first and second substances,
Figure FDA00036377920300000218
and
Figure FDA00036377920300000219
respectively representing FNf times of the t-th iteration c,n Delivery to the g-th user group VNx g Mean and variance of H c,g′ A channel matrix representing the g' th user group of the c-th cluster,
Figure FDA00036377920300000220
and
Figure FDA00036377920300000221
respectively representing the g' th user group VNx at the t-th iteration g′ To FNf c,n The covariance matrix and the mean vector of (a),
Figure FDA00036377920300000222
is the variance of gaussian noise.
2. The DBP architecture signal detection method for a large-scale MU-MIMO system based on user grouping as claimed in claim 1, wherein said nonlinear message passing algorithm is an expectation-propagation based message passing algorithm, and the message update rule of the expectation-propagation based message passing algorithm is:
Figure FDA00036377920300000223
Figure FDA00036377920300000224
wherein the content of the first and second substances,
Figure FDA0003637792030000031
and
Figure FDA0003637792030000032
respectively representing VNx at the time of the t-th iteration within the c-th cluster g To FNf c,n And messages passed in the reverse direction, VN representing variable nodes, FN representing functional nodes,
Figure FDA0003637792030000033
in order to be the a-priori information,
Figure FDA0003637792030000034
represents each group K g Joint constellation symbol vector set, K, for individual users g For each group of users, x \ x g Denotes x divides x g Other transmitted signals, p (y) c,n ∣x g ) Representing a likelihood function.
3. The DBP architecture signal detection method for the large-scale MU-MIMO system based on user grouping as claimed in claim 1, wherein the said central processing unit combines the local information of the antenna cluster based on the message mixing strategy, and estimates the sending signal of each user group includes:
the central processing unit combines the local information of each antenna cluster based on a multidimensional Gaussian multiplication message mixing strategy;
calculating the posterior probability of the signals sent by each user group according to the combined information;
and estimating the signals transmitted by each user group according to the obtained posterior probability of each group of user transmission signals.
4. The DBP architecture signal detection method for the large-scale MU-MIMO system based on user grouping as claimed in claim 3, wherein the merged global information α (x) is g ) Is approximated as a covariance matrix of
Figure FDA0003637792030000035
Mean vector of
Figure FDA0003637792030000036
Gaussian distribution of
Figure FDA0003637792030000037
Expressed as:
Figure FDA0003637792030000038
wherein the content of the first and second substances,
Figure FDA0003637792030000039
Figure FDA00036377920300000310
respectively representing the mean vector and covariance matrix for each user group when the maximum number of iterations is reached.
5. The DBP (direct bus) architecture signal detection method for the large-scale MU-MIMO system based on the user grouping as claimed in claim 3, wherein the posterior probability of the signals transmitted by each user group is:
Figure FDA00036377920300000311
where ξ is the vector composed of the constellation symbols sent by each user group,
Figure FDA00036377920300000312
a set of constellation diagrams is represented,
Figure FDA00036377920300000313
represents each group K g Joint constellation vector set, β (x), for individual users g ξ) represents x g Global confidence in ξ, p (x) g ξ) represents x g A priori of (a) (x) g ξ) represents x g Global information in ξ.
6. The DBP (direct bus protocol) architecture signal detection method for the large-scale MU-MIMO system based on the user grouping as claimed in claim 4, wherein the estimated signals transmitted by each user group are:
Figure FDA00036377920300000314
wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0003637792030000041
indicating the estimated transmission signal of the g-th user group.
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