CN107027132A

CN107027132A - A kind of signal detecting method and device

Info

Publication number: CN107027132A
Application number: CN201610069243.XA
Authority: CN
Inventors: 吴凯
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2016-02-01
Filing date: 2016-02-01
Publication date: 2017-08-08
Anticipated expiration: 2036-02-01
Also published as: CN107027132B; WO2017133408A1

Abstract

The invention discloses a kind of signal detecting method and device, the complexity to reduce signal detection improves the efficiency of signal detection.In this method signal detecting method, the joint channel estimation matrix of serving cell and interfered cell is ranked up first, so as to which each transport layer first to serving cell successively carries out the traversal search of constellation symbol, the M constellation symbol that each transport layer of serving cell retains is determined；Wherein, M is positive integer；For each transport layer of interfered cell, M constellation symbol of the constellation symbol composition retained by calculating in fixed each transport layer combines the corresponding judgement amount in this layer respectively, and hard decision is carried out to each judgement amount, obtain M constellation symbol of this layer reservation.

Description

Signal detection method and device

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a signal detection method and apparatus.

Background

In an enhanced Long Term Evolution (LTE-a) release 12(Rel 12) system, in order to improve system throughput in an Interference scenario, a Network side may issue, through signaling, information of some interfering cells to a User Equipment (UE), so that the UE performs Suppression or deletion detection (Network Assisted Interference and Suppression, NAICS) on an interfering signal of a downlink shared channel (PDSCH) of the interfering cell, where the scenario is to jointly receive a signal of a serving cell and a signal of the interfering cell, and a receiver that jointly receives the signal of the serving cell and the signal of the interfering cell is referred to as an NAICS receiver.

In a conventional receiver (a receiver that does not support the NAICS characteristics), a QR Detection with M algorithm Maximum Likelihood (QRD-M) Detection algorithm is employed to detect a received signal. Based on the traditional receiver, in spatial multiplexing transmission, data of each transmission layer detected by adopting a QRD-M detection algorithm is target data to be received by the UE. The basic idea of the QRD-M detection algorithm is: the transmission layers are searched layer by layer, a plurality of most probable constellation symbols in each transmission layer are selected and reserved, a possible constellation symbol combination (the constellation symbol combination is a vector and is called as a branch in the detection algorithm) is selected, the selection is based on the selection of the branch with the smaller accumulative metric, and after the search of all the layers is completed, the branch with the minimum accumulative metric is selected and output as a detection result.

However, in the NAICS receiver, it is necessary to simultaneously detect a signal (target data) transmitted by the serving cell and a signal (non-target data) transmitted by the interfering cell. If the traditional QRD-M detection algorithm is directly used, target signals cannot be distinguished, so that the detection algorithm cannot perform targeted optimization of a specific scene, the waste of computation is caused, and the complexity of signal detection is increased.

Disclosure of Invention

The embodiment of the invention provides a signal detection method and a signal detection device, which are used for reducing the complexity of signal detection and improving the efficiency of signal detection.

The signal detection method provided by the embodiment of the invention comprises the following steps:

traversing and searching constellation symbols layer by layer for a transmission layer of a service cell, and determining M constellation symbols reserved by each transmission layer of the service cell; wherein M is a positive integer;

determining M constellation symbols reserved by each transmission layer of an interference cell according to M constellation symbols reserved by each transmission layer of the service cell, wherein for each transmission layer of the interference cell, in the process of determining the M constellation symbols reserved by the transmission layer, an M constellation symbol combination formed by the M constellation symbols reserved in the transmission layer and the M constellation symbols reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and a corresponding branch metric value is accumulated; wherein M belongs to {1, …, M };

for each transport layer of the serving cell: and determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer and determining soft bit information corresponding to the search result of the transmission layer according to the M constellation symbols reserved by each transmission layer of the interference cell and the service cell and the accumulated branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer.

In the method provided by the embodiment of the invention, the traversal search of the constellation symbols is purposefully carried out on each transmission layer of the serving cell, and M constellation symbols reserved by each transmission layer of the serving cell are determined, wherein M is a positive integer; determining M constellation symbols reserved by each transmission layer of the interfering cell according to M constellation symbols reserved by each transmission layer of the serving cell without performing traversal search on each transmission layer of the interfering cell, and calculating an M-th constellation symbol combination formed by an M-th constellation symbol reserved in the transmission layer and an M-th constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined for each transmission layer of the interfering cell, and correspondingly accumulating branch metric values; wherein M belongs to {1, …, M }; finally, for each transport layer of the serving cell: and determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer and determining soft bit information corresponding to the search result of the transmission layer according to the M constellation symbols reserved by each transmission layer of the interference cell and the service cell and the accumulated branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer. Therefore, the calculation amount in the signal detection process is reduced, the complexity of signal detection is reduced, and the efficiency of signal detection is improved.

Preferably, before the searching for the constellation symbol layer by layer for the transmission layer of the serving cell, the method further includes:

sorting each column of channel estimation values in a combined channel estimation matrix, and sorting each column of channel estimation values corresponding to a serving cell in the combined channel estimation matrix to the right side of the matrix, and sorting each column of channel estimation values corresponding to an interfering cell in the combined channel estimation matrix to the left side of the matrix.

Therefore, in the whole signal detection process, the constellation symbol search is performed on each transmission layer corresponding to the serving cell in a targeted manner, and then each transmission layer of the interference cell is searched.

Preferably, the arranging each column of channel estimation values corresponding to the serving cell in the combined channel estimation matrix to the right side of the matrix, and arranging each column of channel estimation values corresponding to the interfering cell in the combined channel estimation matrix to the left side of the matrix specifically includes:

aiming at each column of channel estimation values corresponding to the service cells in the combined channel estimation matrix: sequentially arranging the power values corresponding to the channel estimation values of each row from the right side of the matrix to the left according to the sequence from large to small; and aiming at each column of channel estimation values corresponding to the interference cells in the combined channel estimation matrix: and sequentially arranging the power values corresponding to the channel estimation values of each column from the left side to the right side of the matrix according to the sequence from small to large.

Preferably, determining M constellation symbols reserved for each transmission layer of an interfering cell according to M constellation symbols reserved for each transmission layer of the serving cell specifically includes:

for each transmission layer of an interfering cell: calculating the judgment quantity of M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer in the transmission layer of the interference cell corresponding to the transmission layer according to the M constellation symbols reserved in each determined transmission layer;

and performing hard decision on each decision quantity in the M decision quantities to obtain a constellation symbol corresponding to the decision quantity, and taking the constellation symbol corresponding to each decision quantity as the M constellation symbols reserved by the transmission layer of the interference cell.

Therefore, for each transmission layer of the interference cell, the constellation symbols reserved in the transmission layer can be determined without executing the traversal search process of the constellation symbols, the calculation amount is reduced, the overall complexity of signal detection is reduced, and the signal detection efficiency is improved.

Preferably, the decision amounts corresponding to M constellation symbol combinations composed of the constellation symbols reserved in each determined transmission layer are calculated according to the following formula:

wherein,representing the judgment amount of the ith layer transmission layer corresponding to the mth constellation symbol combination in M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer, wherein i represents the number of the current transmission layer of the interference cell;representing the ith element in the equivalent received signal vector; n is a radical of_LRepresenting a total number of transmission layers of a serving cell and an interfering cell; x^leftInitially is a null matrix, and after each constellation symbol search is carried out on the transmission layer, the reserved constellation symbol combination is stored in X^leftPerforming the following steps; x^left(j, m) is X^leftThe element in the jth row and the mth column; r is_i,jRepresenting the elements of the ith row and the jth column in an R matrix obtained by carrying out QR decomposition on a received signal vector in advance; r is_i,iRepresenting the element in the ith row and ith column in the R matrix.

Preferably, for each transmission layer of the interfering cell, in the process of calculating M constellation symbols reserved by the transmission layer, determining an M-th constellation symbol reserved in the transmission layer, and an M-th constellation symbol combination formed by the M constellation symbols reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and the corresponding accumulated branch metric value specifically includes:

for each transmission layer of an interfering cell:

according to the determined constellation symbols reserved in each transmission layer, calculating the mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and the increment of the corresponding branch metric value;

adding the increment of the branch metric value corresponding to the mth constellation symbol combination with the accumulated branch metric value corresponding to the mth constellation symbol combination in the M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer to obtain the mth constellation symbol combination consisting of the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each determined transmission layer before the M constellation symbols reserved in the transmission layer are determined, and corresponding accumulated branch metric value.

Preferably, for each transmission layer of the interfering cell: according to the determined constellation symbols reserved in each transmission layer, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and the increment of the corresponding branch metric value specifically comprises the following steps:

for each transmission layer of an interfering cell: calculating the increment of the corresponding branch metric value of the mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined according to the following formula:

wherein, bm_i(M) represents an increment of a branch metric value corresponding to an M-th constellation symbol combination formed by an M-th constellation symbol reserved in an i-th transmission layer and an M-th constellation symbol reserved in each transmission layer determined before the M-th constellation symbol reserved in the i-th transmission layer is determined, wherein i represents the number of a current transmission layer of the interference cell;representing the ith element in the equivalent received signal vector;representing the retained mth constellation symbol in the ith transmission layer; n is a radical of_LRepresenting a total number of transmission layers of a serving cell and an interfering cell; x^leftInitially is a null matrix, and after each constellation symbol search is carried out on the transmission layer, the reserved constellation symbol combination is stored in X^leftPerforming the following steps; x^left(j, m) is X^leftThe element in the jth row and the mth column; r is_i,jCarrying out QR decomposition on a received signal vector in advance to obtain an element of the ith row and the jth column in an R matrix; r is_i,iIs the element of the ith row and the ith column in the R matrix.

Preferably, after calculating, for each transmission layer of the interfering cell, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before determining the M constellation symbols reserved in the transmission layer, and corresponding accumulated branch metric values, the method further includes:

for each transmission layer of an interfering cell: and combining the mth constellation symbol formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and sequencing the corresponding accumulated branch metric values from small to large.

The signal detection device provided by the embodiment of the invention comprises:

the first determining unit is used for searching constellation symbols of the transmission layer of the service cell layer by layer and determining M constellation symbols reserved by each transmission layer of the service cell; wherein M is a positive integer;

a second determining unit, configured to determine, according to the M constellation symbols reserved by each transmission layer of the serving cell, the M constellation symbols reserved by each transmission layer of the interfering cell, where, for each transmission layer of the interfering cell, in a process of determining the M constellation symbols reserved by the transmission layer, an M-th constellation symbol combination formed by an M-th constellation symbol reserved in the transmission layer and an M-th constellation symbol reserved in each transmission layer that has been determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and a corresponding cumulative branch metric value is obtained; wherein M belongs to {1, …, M };

a third determining unit, configured to, for each transport layer of the serving cell: and determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer and determining soft bit information corresponding to the search result of the transmission layer according to the M constellation symbols reserved by each transmission layer of the interference cell and the service cell and the accumulated branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer.

In the device provided by the embodiment of the invention, the first determination unit is used for carrying out traversal search on constellation symbols on each transmission layer of a service cell in a targeted manner, and M constellation symbols reserved by each transmission layer of the service cell are determined, wherein M is a positive integer; determining, by a second determining unit, M constellation symbols reserved for each transmission layer of the interfering cell according to the M constellation symbols reserved for each transmission layer of the serving cell without performing traversal search on each transmission layer of the interfering cell, and for each transmission layer of the interfering cell, in a process of determining the M constellation symbols reserved for the transmission layer, calculating an M constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and correspondingly accumulating a branch metric value; wherein M belongs to {1, …, M }; finally, for each transport layer of the serving cell, by a third determining unit: and determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer and determining soft bit information corresponding to the search result of the transmission layer according to the M constellation symbols reserved by each transmission layer of the interference cell and the service cell and the accumulated branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer. Therefore, the calculation amount in the signal detection process is reduced, the complexity of signal detection is reduced, and the efficiency of signal detection is improved.

Preferably, before performing the constellation symbol search layer by layer on the transmission layer of the serving cell, the first determining unit is further configured to:

Preferably, when the first determining unit ranks, to the right side of the matrix, each column of channel estimation values corresponding to a serving cell in the combined channel estimation matrix, and ranks, to the left side of the matrix, each column of channel estimation values corresponding to an interfering cell in the combined channel estimation matrix, the first determining unit is specifically configured to:

Preferably, when the second determining unit determines, according to the M constellation symbols reserved for each transmission layer of the serving cell, the M constellation symbols reserved for each transmission layer of the interfering cell, the second determining unit is specifically configured to:

for each transmission layer of an interfering cell: calculating the judgment amount of M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer, which respectively correspond to the transmission layer, according to the M constellation symbols reserved in each determined transmission layer;

Preferably, the second determining unit calculates the decision amounts corresponding to M constellation symbol combinations composed of constellation symbols reserved in each determined transmission layer according to the following formula:

Preferably, the second determining unit is configured to, for each transmission layer of the interfering cell, in the process of determining M constellation symbols reserved by the transmission layer, calculate an M constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and when a corresponding accumulated branch metric value is obtained, specifically:

for each transmission layer of an interfering cell:

Preferably, the second determining unit, for each transmission layer of the interfering cell: according to the determined constellation symbols reserved in each transmission layer, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and when the increment of the corresponding branch metric value is increased, the method is specifically used for:

wherein, bm_i(M) represents an increment of a branch metric value corresponding to an M-th constellation symbol combination formed by an M-th constellation symbol reserved in an i-th transmission layer and an M-th constellation symbol reserved in each transmission layer determined before the M-th constellation symbol reserved in the i-th transmission layer is determined, wherein i represents the number of a current transmission layer of the interference cell;representing the ith element in the equivalent received signal vector;representing the retained mth constellation symbol in the ith transmission layer; n is a radical of_LRepresenting a total number of transmission layers of a serving cell and an interfering cell; x^leftInitially is a null matrix, and after each constellation symbol search is carried out on the transmission layer, the reserved constellation symbol combination is stored in X^leftPerforming the following steps; x^left(j, m) is X^leftThe element in the jth row and the mth column; r is_i,jRepresenting the elements of the ith row and the jth column in an R matrix obtained by carrying out QR decomposition on a received signal vector in advance; r is_i,iRepresenting the element in the ith row and ith column in the R matrix.

Preferably, the second determining unit is further configured to, for each transmission layer of the interfering cell, after calculating an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before determining the M constellation symbols reserved in the transmission layer, and correspondingly accumulating the branch metric values:

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of tree search of a QRD-M algorithm according to an embodiment of the present invention;

fig. 2 is a schematic overall flowchart of a signal detection method according to an embodiment of the present invention;

fig. 3 is a schematic flowchart of a signal detection method according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a signal detection apparatus according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of another signal detection apparatus according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

In the NAICS scenario, a typical transmission model is as follows:

in the above formula, r represents N_R× 1, N_RIndicating the number of receiving antennas; h_S,eqRepresenting an equivalent channel estimate, H, between the serving cell and the UE_I,eqRepresenting an equivalent channel estimate between the interfering cell and the UE; n is a radical of_SNumber of transmission layers, N, representing serving cell_ITransmission representing interfering cellsNumber of layers, N_LIndicates the total number of transmission layers of the serving cell and the interfering cell, and N_L＝N_S+N_I；H_cmb＝(H_S,eqH_I,eq) A transmission channel representing a virtual Multiple Input Multiple Output (MIMO) channel for combining equivalent channel estimates corresponding to a serving cell and an interfering cell, respectively, and H_cmbDimension of the matrix is N_R×N_L；x_STransmitted signal vector, x, representing the serving cell_IA transmitted signal vector representing an interfering cell,an equivalent transmission vector representing a transmission symbol combination of the serving cell and the interfering cell; n denotes a noise vector.

The above parameters and the corresponding physical meanings will be continued hereinafter.

Fig. 1 is a schematic diagram of tree search of a QRD-M algorithm according to an embodiment of the present invention.

Wherein, the N_LTo Nth_L-N_SLayer +1 indicates a transport layer corresponding to a serving cell, and as shown in fig. 1 above the dotted line, layer N_L-N_SLayer to layer 1 represents a transmission layer corresponding to an interfering cell, as shown in a portion below a dotted line in fig. 1.

First from the Nth of the serving cell_LThe layer transmission layer starts to perform traversal search of constellation symbols layer by layer for the transmission layer of the serving cell downwards:

for each search level, the constellation symbols (also referred to as branches) corresponding to the M smaller accumulated branch metric values are selected for retention, the remaining branches are dropped, and the constellation point labeled "×" in fig. 1 represents the dropped branch_LLayer 1, the first and second constellation points (corresponding to drawing "×") shown in the figure can both be referred to as being at Nth_LA branch on the basis of the first constellation point in the layer, correspondingly, the Nth_L-1 layer right sideBoth constellation points may be referred to as being at Nth_LA branch on the basis of the mth constellation point in the layer, etc.

Secondly, searching each transmission layer corresponding to the interfering cell layer by layer, where the searching for each transmission layer of the interfering cell described herein does not refer to performing traversal searching for each transmission layer like the method of searching for each transmission layer of the serving cell, but according to the following method:

for the transmission layer corresponding to the interference cell, the first searched transmission layer is the Nth transmission layer_L-N_SLayer (b): when searching the layer, according to M branches reserved in each transmission layer of a searched serving cell, calculating a decision amount of the M branches in the layer corresponding to the M branches, and then performing hard decision on the M decision amounts to obtain M constellation symbols reserved in the layer, where the M branches reserved in each transmission layer of the serving cell can be understood as M large branches composed of constellation symbols reserved in each transmission layer of the serving cell, for example, the 1 st constellation symbol reserved in each transmission layer of the serving cell constitutes the 1 st large branch, and the M constellation symbols reserved in each transmission layer of the serving cell constitutes the M large branches.

If the interference cell corresponds to multiple transmission layers, the second searched transmission layer is Nth_L-N_SLayer 1, search up to layer 1. For the Nth_L-N_S-each of the 1 to 1 layer transport layers: according to M branches reserved by each searched transmission layer (the searched transmission layers comprise the transmission layers of the searched service cell and the transmission layers of the searched interference cell at the same time), calculating the decision quantity of the M branches corresponding to the layer respectively, and then performing hard decision on the M decision quantities respectively to obtain M constellation symbols reserved by the layer. Wherein, if Q represents the Nth_LAnd M is less than or equal to Q when the total number of the constellation symbols corresponding to the modulation mode adopted by the data transmission in the layer transmission layer is larger than Q.

Referring to fig. 2, a signal detection method provided in an embodiment of the present invention integrally includes the following three steps:

s101, traversing and searching constellation symbols of transmission layers of a service cell layer by layer, and determining M constellation symbols reserved by each transmission layer of the service cell; wherein M is a positive integer;

here, a method of determining the M constellation symbols reserved for each transmission layer of the serving cell will be described in detail below.

S102, determining M constellation symbols reserved for each transmission layer of an interfering cell according to M constellation symbols reserved for each transmission layer of the serving cell, wherein for each transmission layer of the interfering cell, in a process of determining the M constellation symbols reserved for the transmission layer, an M constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved for each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and a corresponding branch metric value is accumulated; wherein M belongs to {1, …, M };

since M in this step takes on the value of M ∈ {1, …, M }, that is, for each transmission layer of the interfering cell: finally, an accumulated branch metric value corresponding to M constellation symbol combinations (i.e., M branches) of the constellation symbols retained in the transmission layer and the constellation symbols retained in each transmission layer determined before the constellation symbols retained in the transmission layer are determined can be determined.

It should be noted that, in this step, the M constellation symbols reserved for each transmission layer of the interfering cell are determined according to the M constellation symbols reserved for each transmission layer of the serving cell, which is specifically as follows:

in the first transmission layer (i.e. Nth) of the determined interfering cell_L-N_SLayer), is determined according to the M constellation symbols reserved for each transmission layer of the serving cell; in the second transmission layer up to the last transmission layer (i.e. Nth transmission layer) of the determined interfering cell_L-N_S-1 layer to 1 st layer) retentionThe M constellation symbols of (1) are determined jointly according to the M constellation symbols reserved for each transmission layer of the serving cell and the M constellation symbols reserved for each determined transmission layer of the interfering cell.

Further, in this step, each of the determined transport layers includes a transport layer of a serving cell. Specifically, when the interfering cell includes a plurality of transmission layers, the first transmission layer (i.e., nth) of the interfering cell is determined_L-N_SLayer), said determined transmission layers each comprise all transmission layers of the serving cell, since in this method, first the M constellation symbols reserved in each transmission layer of the serving cell are determined, and then the M constellation symbols reserved in each transmission layer of the interfering cell are determined; in the second transmission layer (i.e. Nth) of the determined interfering cell_L-N_S-1 layer), each of said determined transmission layers comprising all transmission layers of the determined serving cell and the first transmission layer of the determined interfering cell, since M constellation symbols reserved in the first transmission layer of the interfering cell have been determined when M constellation symbols reserved in the second transmission layer of the interfering cell are determined; and so on.

S103, aiming at each transmission layer of the service cell: and determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer and determining soft bit information corresponding to the search result of the transmission layer according to the M constellation symbols reserved by each transmission layer of the interference cell and the service cell and the accumulated branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer.

The M constellation symbol combinations composed of the constellation symbols reserved in each determined transmission layer in this step may also be referred to as M branches composed of the constellation symbols reserved in each determined transmission layer, and the meaning is the same as that explained above.

The above steps S102 to S103 are an overall flow of the signal detection method provided in the embodiment of the present invention, and a specific signal detection method is given below, referring to fig. 3, and the detailed steps are as follows:

step S201: for the combined channel estimation matrix H_cmbAre ordered such that H is_cmbEach column of channel estimation values corresponding to the middle serving cell is positioned at the right side of the matrix, H_cmbEach column of channel estimation values corresponding to the medium interference cell are positioned on the left side of the matrix, and the reordered combined channel estimation matrix is usedAnd (4) showing.

If the service cell has multiple transmission layers, the power values corresponding to the channel estimation values of each row of the service cell are sequentially arranged from matrix H to matrix H according to the sequence from large to small of the power values corresponding to the channel estimation values of each row_cmbThe right side of (a) starts to line to the left; and if the interference cell also has multiple transmission layers, sequentially arranging the channel estimation values of all the columns corresponding to the interference cell from the left side of the matrix to the right side according to the sequence of the power values corresponding to the channel estimation values of all the columns from small to large.

Wherein, the aboveEach column of channel estimation values corresponds to a transmission layer, and the magnitude of the power value corresponding to the column of channel estimation values represents the channel quality of the transmission layer corresponding to the column of channel estimation values. For example, if the serving cell has two transmission layers and the interfering cell has one transmission layer, the channel estimation matrix H is correspondingly combined_cmbThree rows of elements in the middle, and the sorted matrixThe second and third columns in (1) correspond to two transport layers, the matrix, of the serving cellIn (1)The first column corresponds to one transmission layer of the interfering cell, and the numbers of the transmission layers of the serving cell and the interfering cell are respectively: the number of the transmission layer with better channel quality corresponding to the serving cell is 3, i.e. the 3 rd layer, corresponding to the serving cellColumn 3 in (1); the number of the transmission layer with poor channel quality corresponding to the serving cell is 2, i.e. the layer 2 corresponds toColumn 2 in (1); the number of the transmission layer of the interfering cell is 1, i.e. layer 1, corresponding toColumn 1 in (1).

Therefore, in the subsequent tree search process, each transmission layer of the service cell can be searched first.

Step S202: the joint channel estimation matrix obtained after sequencingAnd performing QR decomposition and outputting a Q matrix and an R matrix. Wherein the Q matrix is unitary matrix, the R matrix is upper triangular matrix, and X is initialized^leftIs N_L× M, BM is a vector of 1 × M R is shown as:

step S203: left-multiplying Q by a received signal vector r^HTo obtain an equivalent received vector

Step S204: traversing and searching constellation symbols layer by layer for each transmission layer of the service cell, namely from Nth_LLayer start to Nth_L-N_S+1 layer, searching layer by layer, determining multiple constellation symbols reserved in each transmission layer of the serving cell, and initializing X^leftIs N_L× M all zero matrix.

The steps are executed as follows:

s204-1, Nth for transmission layer_LAnd the layer is used for respectively substituting the Q constellation symbols in the constellation set corresponding to the layer into the following formula to calculate the branch metric value:

wherein, bm_NL(q) represents the N-th_LThe metric value corresponding to the qth constellation symbol in the layer transmission layer is more than or equal to 1 and less than or equal to Q, and Q represents the total number of constellation symbols corresponding to the modulation mode adopted by the transmission data in the layer transmission layer;representing a vectorN in (1)_LAn element; s_qRepresenting the qth constellation symbol of the Q constellation symbols in the constellation set corresponding to the layer;indicating the Nth matrix of the R matrix obtained by QR decomposition of the received signal vector in advance_LLine N_LThe elements of the column.

After calculating the metric values corresponding to Q constellation symbols, selecting M smaller metric values (M is less than or equal to Q) for reservation, sorting the M reserved metric values according to the sequence from small to large and storing the M metric values in BM, and respectively corresponding constellation symbols s to the M metric values_qDeposit X^leftN of (2)_LRow, the remaining constellation symbols are discarded.

S204-2, Nth for transmission layer_L1 layer to Nth_L-N_SThe +1 layer determines the M constellation symbols (i.e., M branches) reserved in the transmission layer and the accumulated branch metric corresponding to each branch of the transmission layer in the same manner as follows.

Taking one of the transmission layers as an example, since Q constellation symbols corresponding to the transmission layer and M constellation symbols in the last determined transmission layer can form M × Q constellation symbol combinations (i.e., M × Q branches), M × Q operations need to be performed according to the following formula, and then increments of branch metric values corresponding to M × Q branches in the transmission layer are determined:

where M ∈ {1, …, M }, i denotes the transport layer number, i ∈ { N }, and_L-1,…,N_L-N_S+1}；representing the ith element in the equivalent received signal vector; r is_i,jRepresenting the elements of the ith row and the jth column in an R matrix obtained by carrying out QR decomposition on a received signal vector in advance; r is_i,iAn element representing the ith row and the ith column in the R matrix; x^left (j, m) is X^leftRow j and column m.

For M × Q branches in the transport layer:

firstly, the accumulated branch metric values corresponding to M × Q branches in the layer are determined according to the following formula:

BM_tmp((m-1)×Q+q)＝BM(m)+bm_i((m-1)×Q+q) (5)

wherein M ∈ {1, …, M }, i ∈ { N }_L-1,…,N_L-N_S+1 }; BM (M) denotes the M-th element of the M elements newly stored in the vector, each element being a cumulative branchThe metric value. For example, when the Nth is determined_LAfter M branches reserved in the layer 1 and the accumulated branch metric values corresponding to the M branches respectively, the M accumulated branch metric values are sorted from small to large and are replaced and stored in the original BM vector, and then the Nth branch metric value is determined_L-remaining M branches in the 2 layers and accumulated branch metric values for the M branches, respectively, in determining the Nth branch_L-when accumulated branch metric values corresponding to M branches respectively reserved in layer 2, the elements in the newly stored BM vector need to be used according to equation (5), and therefore the corresponding nth stored element in the BM vector_LThe M accumulated branch metric values of 1 layer are newly stored, and so on.

Then, M smaller accumulated branch metric values are selected from the accumulated branch metric values corresponding to M × Q branches in the layer, the M accumulated branch metric values are sorted from small to large and then are replaced and stored in the BM vector, and correspondingly, constellation symbols which are reserved in the layer and correspond to the M accumulated branch metric values are stored in X^leftWhere i corresponds to the number of the current layer, e.g., the layer is the Nth_LLayer 1, storing the M constellation symbols reserved in this layer into X^leftN of (2)_LLine 1, the remaining branches in this layer are discarded.

It should be noted that, in the description of step S204, for each transmission layer of the serving cell, the total number of constellation symbols corresponding to the modulation method adopted by the transmission data in the transmission layer is collectively represented by Q, and of course, the values of Q may be the same or different for different transmission layers, which is not limited in this embodiment of the present invention.

In addition, for the serving cell, the number of transmission layers may be one or more. When the serving cell has only one transmission layer, only the above S204-1 is executed; when the serving cell has multiple transport layers, S204-1 and S204-2 are performed in sequence.

That is, in step S204, each search for one transport layer is determined accordinglyThe M smaller accumulated branch metric values reserved in the layer are sorted according to the sequence from small to large and then are replaced and stored in the original BM vector, and the constellation symbols reserved in the layer corresponding to the M smaller accumulated branch metric values are stored in X^leftIn the row corresponding to the number of that layer.

Step S205: searching constellation symbols of each transmission layer of the interference cell layer by layer, namely from Nth_L-N_SThe layer starts to the layer 1, the search is carried out layer by layer, and for each transmission layer of the interference cell: the M constellation symbols reserved in the transmission layer and the accumulated branch metric values corresponding to the M constellation symbols reserved in the transmission layer are determined in the same manner as follows.

The transmission layer of the interfering cell may have only one layer or may have multiple layers, which is not limited in the embodiment of the present invention.

Taking one of the transmission layers of the interfering cell as an example, the step is performed as follows:

s205-1: according to M constellation symbol combinations (one constellation symbol combination corresponds to current X) formed by the reserved constellation symbols in each determined transmission layer^leftA row of stored constellation symbols) and determining a decision quantity corresponding to each constellation symbol combination in the M constellation symbol combinations in the transmission layer according to the following formula:

wherein,represents the decision quantity of the i-th transmission layer corresponding to the m-th constellation symbol combination, i represents the number of the current transmission layer of the interference cell, i ∈ { N }_L-N_S,…,1}，m∈{1,…,M}。

S205-2: and respectively carrying out hard decision on the M decision values of the transmission layer to obtain M constellation symbols, and taking the M constellation symbols as the M constellation symbols reserved by the transmission layer.

That is to say, forHard decision is carried out to obtain constellation symbolsWherein,representing the mth constellation symbol, i ∈ { N ], retained in the ith layer_L-N_S,…,1}，m∈{1,…,M}。

The hard decision method can be implemented by using a conventional processing method in the existing signal detection method, and embodiments of the present invention are not described herein in detail.

S205-3: the increment of the branch metric value corresponding to each constellation symbol (i.e., branch) retained in the transport layer is determined according to the following formula:

wherein, bm_i(m) represents the increment of the branch metric value corresponding to the mth constellation symbol reserved in the ith transmission layer of the interfering cell, i ∈ { N }_L-N_S,…,1}，m∈{1,…,M}。

And, according to the result of the formula (7), calculating an accumulated branch metric value corresponding to each branch reserved in the transport layer by using the following formula:

BM_tmp(m)＝BM(m)+bm_i(m) (8)

where, i ∈ { N_L-N_S…,1, M ∈ {1, …, M }. for example, when i ═ N_L-N_SIs calculated by the formula (8)The mth accumulated branch metric value is the nth_L-N_SThe accumulated branch metric value corresponding to the mth branch in the layer.

S205-4: sorting the accumulated branch metric values corresponding to each constellation symbol (i.e. branch) retained in the transmission layer from small to large, replacing and storing the sorted accumulated branch metric values into a BM vector, and storing the constellation symbol corresponding to each accumulated branch metric value to X^leftIn the row corresponding to the transport layer number.

That is, in step S205, each time a transmission layer is searched, M constellation symbols reserved in the layer and the accumulated branch metric values corresponding to the M constellation symbols are correspondingly determined, the accumulated branch metric values corresponding to the M constellation symbols reserved in the layer are sorted according to the order from small to large and then are replaced and stored in the original BM vector, and the constellation symbols in the layer corresponding to the M accumulated branch metric values are stored in X^leftIn the row corresponding to the number of that layer.

Step S206: for each transport layer of the serving cell: according to M constellation symbols reserved by each transmission layer of an interference cell and a service cell and M accumulation branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer, determining one constellation symbol in a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer, and determining soft bit information corresponding to the search result of the transmission layer.

That is, after all transmission layers of the serving cell and the interfering cell are searched, each transmission layer retains M constellation symbols, thereby X^leftTherein store N_L× M elements, this N_L× M elements are N_L× M constellation symbols, and correspondingly, the latest M elements, that is, M constellation symbol combinations (one constellation symbol combination corresponds to X) composed of constellation symbols reserved in each transmission layer of the serving cell and the interfering cell are stored in the BM^leftIs stored inColumn constellation symbols) are respectively associated with the accumulated branch metric values.

Thus, for each transport layer of the serving cell: according to X^leftIs stored in_L× M constellation symbols and the latest M accumulated branch metric values stored in BM, determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as the search result of the transmission layer, and determining the soft bit information corresponding to the search result of the transmission layer.

In addition, in this embodiment, each time the M accumulated branch metric values are replaced and stored in the BM, the M accumulated branch metric values are sorted and stored in the order from small to large, and of course, the M accumulated branch metric values may be sorted in other orders, for example, in the order from large to small, which is not limited in this embodiment of the present invention.

Specific examples are given below.

In the LTE network, a serving cell is TM6 layer-1 transmission, a Modulation scheme is Quadrature Phase Shift coding (QPSK), an interfering cell is TM6 layer-1 transmission, a Modulation scheme is 16 Quadrature Amplitude Modulation (QAM), and the number N of receiving antennas corresponding to a terminal is assumed to be N_R2, so that the total number of transmission layers N of the serving cell and the interfering cell_L2. Based on the scene, the process of detecting the signal is as follows:

(1) by H_S,eqIndicating the equivalent channel estimate, H, corresponding to the serving cell_I,eqRepresenting the equivalent channel estimation corresponding to the interfering cell, the joint equivalent channel estimation matrix corresponding to the serving cell and the interfering cell is represented by H_cmbThat is, the matrix is a 2X2 matrix. For the joint equivalent channel estimation matrix H_cmbThe channel estimation values of each column in the array are sequenced to obtain a matrixSo that H_S,eqIs located in a matrixColumn 2, H_I,eqIs located in a matrixColumn 1.

(2) To pairAnd carrying out QR decomposition and carrying out tree search based on the equivalent transmission model obtained by the QR decomposition.

(3) The constellation symbol search is carried out on the transmission layer corresponding to the service cell, the number of the transmission layer is 2, namely the layer 2 corresponds to the transmission layerColumn 2 of (1) needs to perform Q-4 operations to obtain branch metric values corresponding to 4 constellation symbols (branches) in the layer, select to retain M-4 branches, sort the branch metric values corresponding to the 4 branches, and store the branch metric values in the BM vector, and store the constellation symbols in the layer corresponding to the 4 branch metric values in X^leftLine 2 of (a).

(4) Search is carried out on a transmission layer corresponding to the interference cell, wherein the number of the transmission layer is 1, namely the layer 1 corresponds to the transmission layerColumn 1. Specifically, according to 4 branches reserved in a transmission layer (i.e., layer 2) corresponding to a serving cell, the decision amounts of the 4 branches in the current layer are respectively calculated, hard decision is respectively performed on the 4 decision amounts to obtain 4 constellation symbols, and the 4 constellation symbols are used as the 4 constellation symbols reserved in the transmission layer. Then, calculating the accumulated branch metric values corresponding to the 4 constellation symbols reserved in the transmission layer, sorting the 4 accumulated branch metric values, replacing and storing the 4 accumulated branch metric values into the BM vector, and respectively pairing the 4 accumulated branch metric valuesStoring the corresponding constellation symbol into X^leftLine 1.

(4) According to the 4 constellation symbols (i.e. X) reserved in the layer 1 and layer 2 transmission layers respectively^left2 × 4 constellation symbols stored therein) and 4 accumulated branch metric values newly stored in the BM vector, determine one constellation symbol of 4 constellation symbols corresponding to the transmission layer (i.e., layer 2) of the serving cell as a search result of the transmission layer, and determine soft bit information corresponding to the search result of the transmission layer of the serving cell.

In another embodiment:

it is assumed that in the LTE network, a serving cell is TM4 layer-2 transmission, a modulation scheme corresponding to each layer is QPSK, an interfering cell is TM4 layer-2 transmission, a modulation scheme corresponding to each layer is 16QAM, and the number N of receiving antennas corresponding to a terminal is N_R2, so that the total number of transmission layers N of the serving cell and the interfering cell_L4. Based on the scene, the process of detecting the signal is as follows:

(A) by H_S,eqIndicating the equivalent channel estimate, H, corresponding to the serving cell_I,eqRepresenting the equivalent channel estimation corresponding to the interfering cell, the joint equivalent channel estimation matrix corresponding to the serving cell and the interfering cell is represented by H_cmbThat is, the matrix is a 2X4 matrix. For the joint equivalent channel estimation matrix as H_cmbThe channel estimation values of each column in the array are sequenced to obtain a matrixSo that H_S,eqIs located in a matrixAnd the column with the larger power is located at the 4 th column; h_I,eqIs located in a matrixAnd the column with the greater power is located at column 2.

(B) To pairAnd carrying out QR decomposition and carrying out tree search based on the equivalent transmission model obtained by the QR decomposition.

(C) Carrying out constellation symbol search on the transmission layer of the interference cell layer by layer:

first, a layer with better channel quality corresponding to a serving cell is searched, corresponding toColumn 4 of (1), the number of this layer is 4, that is, layer 4, needs to perform Q ═ 4 operations, to obtain branch metric values corresponding to 4 constellation symbols (branches) in this layer, to select and retain M ═ 4 branches, to sort the branch metric values corresponding to these 4 branches and store them in the BM vector, to store the constellation symbols in this layer corresponding to these 4 branch metric values in X respectively^leftLine 4 of (1).

Secondly, searching the layer with poor channel quality corresponding to the service cell corresponding to the layer with poor channel qualityThe number of the layer is 3, that is, the layer 3 needs to perform Q × M-16 operations to obtain accumulated branch metric values corresponding to 16 branches in the layer, and select a branch reservation corresponding to 4 smaller accumulated branch metric values from the accumulated branch metric values, and discard the rest of the branches, the accumulated branch metric values corresponding to 4 branches reserved in the layer are sorted and stored in a BM vector, and constellation symbols in the layer corresponding to the 4 branch metric values are stored in X^leftLine 3.

(D) Respectively searching two transmission layers corresponding to the interference cell:

specifically, the layer with better channel quality corresponding to the interference cell is searched first, corresponding to the layer with better channel qualityColumn 2, the layer is numbered 2, i.e., layer 2. 4 constellation symbol combinations (each constellation symbol combination corresponds to the current X) formed according to the determined constellation symbols reserved in each transmission layer (namely, the 4 th layer and the 3 rd layer)^leftA row of constellation symbols stored therein), respectively calculating the decision quantity of the 4 constellation symbol combinations in the current layer, respectively performing hard decision on the 4 decision quantities to obtain 4 constellation symbols, and taking the 4 constellation symbols as the 4 constellation symbols reserved in the transmission layer. Then, calculating the accumulated branch metric values corresponding to the 4 constellation symbols reserved in the transmission layer, sorting the 4 accumulated branch metric values, replacing and storing the 4 accumulated branch metric values into a BM vector, and storing the constellation symbols corresponding to the 4 accumulated branch metric values into X^leftLine 2 of (a).

Secondly, searching the layer with poor channel quality corresponding to the interference cell, corresponding to the layer with poor channel qualityColumn 1, the layer numbered 1, i.e., layer 1. 4 constellation symbol combinations (each constellation symbol combination corresponds to the current X) formed by the determined constellation symbols reserved in each transmission layer (namely, the 4 th layer, the 3 rd layer and the 2 nd layer)^leftA row of constellation symbols stored therein), respectively calculating the decision quantity of the 4 constellation symbol combinations in the current layer, respectively performing hard decision on the 4 decision quantities to obtain 4 constellation symbols, and taking the 4 constellation symbols as the 4 constellation symbols reserved in the transmission layer. Then, calculating the accumulated branch metric values corresponding to the 4 constellation symbols reserved in the transmission layer, sorting the 4 accumulated branch metric values, replacing and storing the 4 accumulated branch metric values into a BM vector, and storing the constellation symbols corresponding to the 4 accumulated branch metric values into X^leftLine 1.

(E) For each transport layer (i.e., layer 4 and layer 3) of the serving cell: according to 4 constellation symbols (namely X) reserved in the transmission layers of the 1 st layer, the 2 nd layer, the 3 rd layer and the 4 th layer^left4 × 4 constellation symbols stored therein) and the newly stored 4 accumulated branch metric values in the BM vector, determine the transport layerOne of the corresponding 4 constellation symbols is used as a search result of the transmission layer, and soft bit information corresponding to the search result of the transmission layer of the serving cell is determined.

Referring to fig. 4, an embodiment of the present invention provides a signal detection apparatus, including:

a first determining unit 11, configured to perform traversal search of constellation symbols layer by layer on a transmission layer of a serving cell, and determine M constellation symbols reserved by each transmission layer of the serving cell; wherein M is a positive integer;

a second determining unit 12, configured to determine, according to the M constellation symbols reserved by each transmission layer of the serving cell, the M constellation symbols reserved by each transmission layer of the interfering cell, where, for each transmission layer of the interfering cell, in a process of determining the M constellation symbols reserved by the transmission layer, an mth constellation symbol combination formed by an mth constellation symbol reserved in the transmission layer and an mth constellation symbol reserved in each transmission layer that has been determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and a corresponding cumulative branch metric value is obtained; wherein M belongs to {1, …, M };

a third determining unit 13, configured to, for each transport layer of the serving cell: and determining one constellation symbol of a plurality of constellation symbols corresponding to the transmission layer as a search result of the transmission layer and determining soft bit information corresponding to the search result of the transmission layer according to the M constellation symbols reserved by each transmission layer of the interference cell and the service cell and the accumulated branch metric values respectively corresponding to M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer.

The device may be, for example, a NAICS receiver.

Preferably, before performing the constellation symbol search layer by layer on the transmission layer of the serving cell, the first determining unit 11 is further configured to:

Preferably, when the first determining unit 11 ranks, to the right side of the combined channel estimation matrix, each column of channel estimation values corresponding to a serving cell in the combined channel estimation matrix, and ranks, to the left side of the matrix, each column of channel estimation values corresponding to an interfering cell in the combined channel estimation matrix, the first determining unit is specifically configured to:

Preferably, when the second determining unit 12 determines, according to the M constellation symbols reserved for each transmission layer of the serving cell, the M constellation symbols reserved for each transmission layer of the interfering cell, the determining unit is specifically configured to:

Preferably, the second determining unit 12 calculates the decision amounts corresponding to M constellation symbol combinations composed of constellation symbols reserved in each determined transmission layer according to the following formula:

Preferably, the second determining unit 12 is configured to, for each transmission layer of the interfering cell, in the process of determining M constellation symbols reserved by the transmission layer, calculate an M constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and when a corresponding accumulated branch metric value is used specifically:

for each transmission layer of an interfering cell:

Preferably, the second determining unit 12, for each transmission layer of the interfering cell: according to the determined constellation symbols reserved in each transmission layer, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and when the increment of the corresponding branch metric value is increased, the method is specifically used for:

wherein, bm_i(M) represents an increment of a branch metric value corresponding to an M-th constellation symbol combination formed by the M-th constellation symbol reserved in the i-th transmission layer and the M-th constellation symbol reserved in each transmission layer determined before the M-th constellation symbol reserved in the i-th transmission layer is determined, and i represents low interferenceThe number of the current transmission layer is distinguished;representing the ith element in the equivalent received signal vector;representing the retained mth constellation symbol in the ith transmission layer; n is a radical of_LRepresenting a total number of transmission layers of a serving cell and an interfering cell; x^leftInitially is a null matrix, and after each constellation symbol search is carried out on the transmission layer, the reserved constellation symbol combination is stored in X^leftPerforming the following steps; x^left(j, m) is X^leftThe element in the jth row and the mth column; r is_i,jRepresenting the elements of the ith row and the jth column in an R matrix obtained by carrying out QR decomposition on a received signal vector in advance; r is_i,iRepresenting the element in the ith row and ith column in the R matrix.

Preferably, the second determining unit 12 is further configured to, for each transmission layer of the interfering cell, after calculating an M-th constellation symbol combination formed by the M-th constellation symbol reserved in the transmission layer and the M-th constellation symbol reserved in each transmission layer determined before determining the M constellation symbols reserved in the transmission layer, and correspondingly accumulating the branch metric values:

In the embodiment of the present invention, each of the functional units may be implemented by a specific physical device such as a hardware processor.

Referring to fig. 5, an embodiment of the present invention further provides a signal detection apparatus, which may be, for example, a UE.

The processor 301, configured to read the program in the memory 304, executes the following processes:

signals transmitted by the serving cell and the interfering cell are received by the transceiver 302 and detected.

When detecting the received signal, the processor 301 is specifically configured to:

Preferably, before the searching for the constellation symbol layer by layer for the transmission layer of the serving cell, the processor 301 is further configured to:

Preferably, the processor 301 arranges each column of channel estimation values corresponding to the serving cell in the combined channel estimation matrix to the right side of the matrix, and when each column of channel estimation values corresponding to the interfering cell in the combined channel estimation matrix is arranged to the left side of the matrix, specifically:

aiming at each column of channel estimation values corresponding to the service cells in the combined channel estimation matrix: sequentially arranging the power values corresponding to the channel estimation values of each row from the right side of the matrix to the left according to the sequence from large to small; and aiming at each column of channel estimation values corresponding to the interference cells in the combined channel estimation matrix: and sequentially arranging the power values corresponding to the channel estimation values of each column from the left side of the matrix to the right side according to the sequence from small to large.

Preferably, when the processor 301 determines, according to the M constellation symbols reserved for each transmission layer of the serving cell, the M constellation symbols reserved for each transmission layer of the interfering cell, the processor is specifically configured to:

Preferably, the processor 301 calculates the decision amounts corresponding to M constellation symbol combinations composed of the constellation symbols reserved in each determined transmission layer according to the following formula:

wherein,representing the judgment amount of the ith layer transmission layer corresponding to the mth constellation symbol combination in M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer, wherein i represents the number of the current transmission layer of the interference cell; y E_iRepresenting the ith element in the equivalent received signal vector; n is a radical of_LRepresenting a total number of transmission layers of a serving cell and an interfering cell; x^leftInitially is a null matrix, and after each constellation symbol search is carried out on the transmission layer, the reserved constellation symbol combination is stored in X^leftPerforming the following steps; x^left(j, m) is X^leftThe element in the jth row and the mth column; r is_i,jRepresenting the elements of the ith row and the jth column in an R matrix obtained by carrying out QR decomposition on a received signal vector in advance; r is_i,iRepresenting the element in the ith row and ith column in the R matrix.

Preferably, the processor 301, for each transmission layer of the interfering cell, in the process of determining M constellation symbols reserved by the transmission layer, calculates an M constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved in each transmission layer determined before determining the M constellation symbols reserved in the transmission layer, and when corresponding to the accumulated branch metric value, is specifically configured to:

for each transmission layer of an interfering cell:

Preferably, the processor 301, for each transmission layer of the interfering cell: according to the determined constellation symbols reserved in each transmission layer, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and when the increment of the corresponding branch metric value is increased, the method is specifically used for:

Preferably, the processor 301, for each transmission layer of the interfering cell, after calculating an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before determining the M constellation symbols reserved in the transmission layer, and corresponding accumulated branch metric values, is further configured to:

In FIG. 5, a bus architecture (represented by bus 300), bus 300 may include any number of interconnected buses and bridges, bus 300 linking together various circuits including one or more processors, represented by general purpose processor 301, and memory, represented by memory 304. The bus 300 may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. A bus interface 303 provides an interface between the bus 300 and the transceiver 302. The transceiver 302 may be one element or may be multiple elements, such as multiple receivers and transmitters, providing a means for communicating with various other apparatus over a transmission medium. For example: the transceiver 302 receives external data from other devices. The transceiver 302 is used for transmitting the data processed by the processor 301 to other devices. Depending on the nature of the computing system, a user interface 305, such as a keypad, display, speaker, microphone, joystick, may also be provided.

The processor 301 is responsible for managing the bus 300 and general processing, such as running a general-purpose operating system as described above. And memory 304 may be used to store data used by processor 301 in performing operations.

Alternatively, the processor 301 may be, for example, a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), a Complex Programmable Logic Device (CPLD), or the like.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of signal detection, the method comprising:

determining M constellation symbols reserved by each transmission layer of an interference cell according to M constellation symbols reserved by each transmission layer of the service cell, wherein for each transmission layer of the interference cell, in the process of determining the M constellation symbols reserved by the transmission layer, an M constellation symbol combination formed by the M constellation symbols reserved in the transmission layer and the M constellation symbols reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and a corresponding branch metric value is accumulated; wherein M belongs to {1, ·, M };

2. The method of claim 1, wherein before the searching for the constellation symbol layer by layer for the transmission layer of the serving cell, the method further comprises:

3. The method according to claim 2, wherein the arranging each column of channel estimation values corresponding to a serving cell in the combined channel estimation matrix to a right side of the matrix and each column of channel estimation values corresponding to an interfering cell in the combined channel estimation matrix to a left side of the matrix comprises:

4. The method according to claim 1, wherein the determining the M constellation symbols reserved for each transmission layer of the interfering cell according to the M constellation symbols reserved for each transmission layer of the serving cell includes:

5. The method according to claim 4, wherein the decision quantities corresponding to the M constellation symbol combinations respectively consisting of the constellation symbols reserved in each determined transmission layer are calculated according to the following formula:

wherein,representing the judgment amount of the ith layer transmission layer corresponding to the mth constellation symbol combination in M constellation symbol combinations consisting of the constellation symbols reserved in each determined transmission layer, wherein i represents the number of the current transmission layer of the interference cell;representing the ith element in the equivalent received signal vector; n is a radical of_LIndicating serving and interfering cellsThe total number of transport layers of (a); x^leftInitially is a null matrix, and after each constellation symbol search is carried out on the transmission layer, the reserved constellation symbol combination is stored in X^leftPerforming the following steps; x^left(j, m) is X^leftThe element in the jth row and the mth column; r is_i,jRepresenting the elements of the ith row and the jth column in an R matrix obtained by carrying out QR decomposition on a received signal vector in advance; r is_i,iRepresenting the element in the ith row and ith column in the R matrix.

6. The method of claim 1, wherein for each transmission layer of the interfering cell, in determining M constellation symbols reserved by the transmission layer, an M constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and the corresponding accumulated branch metric value specifically comprises:

for each transmission layer of an interfering cell:

7. The method of claim 6, wherein for each transmission layer of an interfering cell: according to the determined constellation symbols reserved in each transmission layer, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and the increment of the corresponding branch metric value specifically comprises the following steps:

8. The method of claim 1, wherein after calculating, for each transmission layer of the interfering cell, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before determining the M constellation symbols reserved in the transmission layer, and a corresponding accumulated branch metric value, the method further comprises:

9. A signal detection apparatus, comprising:

a second determining unit, configured to determine, according to the M constellation symbols reserved by each transmission layer of the serving cell, the M constellation symbols reserved by each transmission layer of the interfering cell, where, for each transmission layer of the interfering cell, in a process of determining the M constellation symbols reserved by the transmission layer, an M-th constellation symbol combination formed by an M-th constellation symbol reserved in the transmission layer and an M-th constellation symbol reserved in each transmission layer that has been determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and a corresponding cumulative branch metric value is obtained; wherein M belongs to {1, ·, M };

10. The apparatus of claim 9, wherein the first determining unit, before performing the constellation symbol search layer by layer on the transmission layer of the serving cell, is further configured to:

11. The apparatus of claim 10, wherein the first determining unit is configured to, when arranging the columns of channel estimation values corresponding to the serving cell in the joint channel estimation matrix to the right side of the matrix and arranging the columns of channel estimation values corresponding to the interfering cell in the joint channel estimation matrix to the left side of the matrix, specifically:

12. The apparatus of claim 9, wherein the second determining unit, when determining the M constellation symbols reserved for each transmission layer of the interfering cell according to the M constellation symbols reserved for each transmission layer of the serving cell, is specifically configured to:

13. The apparatus according to claim 12, wherein the second determining unit calculates the decision amounts respectively corresponding to M constellation symbol combinations composed of constellation symbols reserved in each determined transmission layer according to the following formula:

14. The apparatus of claim 9, wherein the second determining unit is configured to, for each transmission layer of the interfering cell, in the process of determining the M constellation symbols reserved by the transmission layer, calculate an M-th constellation symbol combination formed by an M constellation symbol reserved in the transmission layer and an M constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined, and when corresponding to the accumulated branch metric value, specifically:

for each transmission layer of an interfering cell:

15. The apparatus of claim 14, wherein the second determining unit, for each transmission layer of an interfering cell: according to the determined constellation symbols reserved in each transmission layer, an mth constellation symbol combination formed by the mth constellation symbol reserved in the transmission layer and the mth constellation symbol reserved in each transmission layer determined before the M constellation symbols reserved in the transmission layer are determined is calculated, and when the increment of the corresponding branch metric value is increased, the method is specifically used for:

16. The apparatus of claim 9, wherein the second determining unit is further configured to, for each transmission layer of the interfering cell, after calculating an mth constellation symbol combination formed by an mth constellation symbol reserved in the transmission layer and an mth constellation symbol reserved in each transmission layer determined before determining the mth constellation symbol reserved in the transmission layer, and corresponding to the accumulated branch metric value: