CN117220730A

CN117220730A - Multi-stream data demodulation method, device, electronic equipment and computer storage medium

Info

Publication number: CN117220730A
Application number: CN202311221507.5A
Authority: CN
Inventors: 古强
Original assignee: Chongqing Wuqi Microelectronics Co ltd; Shanghai Wuqi Microelectronics Co Ltd
Current assignee: Chongqing Wuqi Microelectronics Co ltd; Shanghai Wuqi Microelectronics Co Ltd
Priority date: 2023-09-20
Filing date: 2023-09-20
Publication date: 2023-12-12

Abstract

The application provides a multi-stream data demodulation method, a device, an electronic device and a computer storage medium, which relate to the technical field of communication and are applied to a wireless communication network adopting MIMO technology, and a target AP at least supports two demodulation algorithms, wherein the method comprises the following steps: according to a demodulation algorithm supported by a target AP and channel state information between each UE and measured by the target AP in an uplink mode, performing correlation pairing on each UE to obtain an initial UE pairing result under each demodulation algorithm; according to the current demodulation algorithm applied by the target AP, controlling the target AP to carry out MU-MIMO transmission on the paired UE in the corresponding initial UE pairing result; in the uplink mode, switching the demodulation algorithm of the target AP according to the mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target AP. Thus, the transmission efficiency is improved under the condition of ensuring the complexity of hardware execution.

Description

Multi-stream data demodulation method, device, electronic equipment and computer storage medium

Technical Field

The present application relates to the field of communications technologies, and in particular, to a method and apparatus for demodulating multi-stream data, an electronic device, and a computer storage medium.

Background

MIMO (Multiple-User Multiple-Input Multiple-Output) technology is one of the most important characteristics of Wi-Fi technical standards, and the MIMO technology thoroughly changes the operation mode of a Wi-Fi network and obviously improves the total throughput and the total capacity of the network. The MIMO technology adopts a spatial multiplexing technology to process wireless signals, converts data into a plurality of parallel data substreams after multiple cutting, synchronously transmits the data substreams through a plurality of antennas, generates independent parallel channel transmission signal streams in the air, and can doubly improve the throughput, transmission distance and spectrum utilization efficiency of a communication system under the condition of not increasing bandwidth. Although MIMO technology brings about performance improvement, it also presents a great challenge to the receiver in demodulating data, and it becomes critical to determine the receiver performance whether the corresponding data stream can be correctly demodulated from multiple data streams.

Disclosure of Invention

The application aims to provide a multi-stream data demodulation method, a multi-stream data demodulation device, electronic equipment and a computer storage medium, so that transmission efficiency is improved under the condition that hardware execution complexity is guaranteed.

In a first aspect, an embodiment of the present application provides a method for demodulating multi-stream data, which is applied to a wireless communication network adopting MIMO technology, where a target AP in the wireless communication network supports at least two demodulation algorithms; the multi-stream data demodulation method includes:

according to the demodulation algorithm supported by the target AP and the channel state information between the target AP and each user terminal UE measured in the uplink mode, carrying out correlation pairing on each UE to obtain an initial UE pairing result under each demodulation algorithm; wherein, the UE has connection requirement with the target AP, and a correlation threshold value adopted in correlation pairing is related to a corresponding demodulation algorithm supported by the target AP;

according to the current demodulation algorithm applied by the target AP, controlling the target AP to carry out MU-MIMO transmission on the paired UE in the corresponding initial UE pairing result;

in an uplink mode, switching a demodulation algorithm of the target AP according to mutual information of a first received data symbol obtained based on a current demodulation algorithm and a current modulation mode of the target AP; wherein the first received data symbols correspond to data streams from respective ones of the UEs.

Further, the performing correlation pairing on each UE according to the demodulation algorithm supported by the target AP and the channel state information between the target AP and each UE measured in the uplink mode, to obtain an initial UE pairing result of the target AP under each demodulation algorithm, including:

determining a correlation threshold value corresponding to each demodulation algorithm supported by the target AP;

generating a channel state matrix according to channel state information between the target AP and each UE, which is measured in an uplink mode;

determining a normalized correlation matrix according to the channel state matrix;

determining a weak correlation set corresponding to each correlation threshold value according to the normalized correlation matrix; the weak correlation set comprises coordinates corresponding to elements smaller than a corresponding correlation threshold value in the normalized correlation matrix;

determining an initial UE pairing result of the target AP under a corresponding demodulation algorithm according to the weak correlation set corresponding to each correlation threshold value; the initial UE pairing result comprises at least one group of paired UE with correlation between every two paired UE being lower than a corresponding correlation threshold value.

Further, the switching of the demodulation algorithm for the target AP according to the mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target AP includes:

controlling the target AP to start a first detector corresponding to a first demodulation algorithm to detect data streams from each UE, and calculating in real time to obtain a current SINR value;

according to the current SINR value and the current modulation mode of the target AP, calculating to obtain the current mutual information of the first received data symbol;

determining whether the target AP is switched to a second detector corresponding to a second demodulation algorithm according to the magnitude relation between the current mutual information of the first received data symbol and a preset mutual information threshold value; and the demodulation performance corresponding to the second demodulation algorithm is better than that corresponding to the first demodulation algorithm.

Further, the calculating, according to the SINR value and the current modulation mode of the target AP, current mutual information of the first received data symbol includes:

determining a target mutual information calculation formula according to the current modulation mode of the target AP, and bringing the SINR value into the target mutual information calculation formula to calculate and obtain the current mutual information of the first received data symbol; or,

determining mutual information corresponding to the SINR value and the current modulation mode of the target AP, which are obtained by searching in a preset display lookup table, as current mutual information of the first received data symbol; the display lookup table is generated according to a preset SINR value variation range and a mutual information calculation formula corresponding to a plurality of modulation modes.

Further, the multi-stream data demodulation method further includes:

screening target UE supporting at least two demodulation algorithms from each UE according to the demodulation algorithm supported by each UE;

in a downlink mode, switching a demodulation algorithm of the target UE according to mutual information of a second received data symbol obtained based on a current demodulation algorithm and a current modulation mode of the target UE; wherein the second received data symbol corresponds to a data stream from the target AP.

Further, the demodulation algorithm comprises a Linear Minimum Mean Square Error (LMMSE) algorithm and a Maximum Likelihood Decoding (MLD) algorithm, wherein a correlation threshold value corresponding to the LMMSE algorithm is smaller than a correlation threshold value corresponding to the MLD algorithm; in a downlink mode, each paired UE in the initial UE pairing result under the LMMSE algorithm demodulates the multi-user data stream sent by the target AP by using an LMMSE detector corresponding to the LMMSE algorithm; in the downlink mode, the target UE in each paired UE in the initial UE pairing result in the MLD algorithm demodulates the multi-user data stream sent by the target AP by using the MLD detector corresponding to the MLD algorithm.

Further, after the mutual information of the first received data symbol obtained according to the current demodulation algorithm and the current modulation mode based on the target AP, the multi-stream data demodulation method further includes:

determining the total channel capacity corresponding to each UE according to the channel state information between each UE and the target AP measured in the uplink mode;

and when the mutual information of the first received data symbol is smaller than a preset mutual information threshold under the current demodulation algorithm of the target AP, taking the UE with the total channel capacity larger than the preset channel capacity threshold as a pairing UE to obtain a target UE pairing result under the current demodulation algorithm.

In a second aspect, an embodiment of the present application further provides a multi-stream data demodulation apparatus, which is applied to a wireless communication network adopting MIMO technology, where a target AP in the wireless communication network supports at least two demodulation algorithms; the multi-stream data demodulation apparatus includes:

the first pairing module is used for carrying out correlation pairing on each UE according to the demodulation algorithm supported by the target AP and the channel state information between the target AP and each user terminal UE measured in the uplink mode, so as to obtain an initial UE pairing result under each demodulation algorithm; wherein, the UE has connection requirement with the target AP, and a correlation threshold value adopted in correlation pairing is related to a corresponding demodulation algorithm supported by the target AP;

the transmission control module is used for controlling the target AP to carry out MU-MIMO transmission on the paired UE in the corresponding initial UE pairing result according to the current demodulation algorithm applied by the target AP;

the first switching module is used for switching the demodulation algorithm of the target AP according to the mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target AP in an uplink mode; wherein the first received data symbols correspond to data streams from respective ones of the UEs.

In a third aspect, an embodiment of the present application further provides an electronic device, including a memory, and a processor, where the memory stores a computer program that can be run on the processor, and the processor implements the method for demodulating multi-stream data according to the first aspect when executing the computer program.

In a fourth aspect, an embodiment of the present application further provides a computer storage medium, where a computer program is stored, where the computer program is executed by a processor to perform the multi-stream data demodulation method according to the first aspect.

The method, the device, the electronic equipment and the computer storage medium for demodulating the multi-stream data are applied to a wireless communication network adopting the MIMO technology, a target AP in the wireless communication network at least supports two demodulation algorithms, and when the multi-stream data demodulation is carried out, correlation pairing is carried out on each UE according to the demodulation algorithm supported by the target AP and channel state information between each UE and measured by the target AP in an uplink mode, so as to obtain an initial UE pairing result under each demodulation algorithm; the UE has connection requirements with the target AP, and a correlation threshold value adopted in correlation pairing is related to a corresponding demodulation algorithm supported by the target AP; then according to the current demodulation algorithm applied by the target AP, controlling the target AP to carry out MU-MIMO transmission on the paired UE in the corresponding initial UE pairing result; in the uplink mode, switching the demodulation algorithm of the target AP according to the mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target AP; wherein the first received data symbols correspond to data streams from respective UEs. Therefore, UE pairing of MU-MIMO transmission is realized, and switching of demodulation algorithm is realized based on mutual information, so that transmission efficiency is improved under the condition of ensuring hardware execution complexity.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is a flow chart of a multi-stream data demodulation method according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a multi-stream data demodulation device according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of another multi-stream data demodulation device according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The technical solutions of the present application will be clearly and completely described in connection with the embodiments, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The MIMO detector demodulation algorithms that are widely used at present are LMMSE (Linear Minimum Mean Squared Error, linear minimum mean square error) algorithm, MLD (Maximum likelihood decoding ) algorithm, and the like. The MLD algorithm is an optimal receiver algorithm, but has high complexity and high hardware implementation difficulty, and brings great challenges to chip area, power consumption and calculation delay. While LMMSE is a linear demodulator algorithm that provides a suboptimal demodulation performance in complex channel environments, but with low computational complexity. Based on this, the embodiment of the application provides a method, a device, an electronic device and a computer storage medium for demodulating multi-stream data, which propose a dynamic switching scheme of a MIMO demodulation algorithm, and by monitoring the channel state to dynamically switch between an LMMSE detector (i.e., LMMSE demodulator) and an MLD detector (i.e., MLD demodulator), the receiver can fully utilize the best transmission efficiency of a spatial channel under the condition of ensuring the complexity of hardware execution.

In addition, MU-MIMO (Multi-User Multiple-Input Multiple-Output) is an important feature that is additionally given in Wi-Fi latest standards since the release of 802.11ac Wave 2 (i.e., 802.11ac 2.0 standards). The embodiment of the application provides an effective MU-MIMO pairing scheme by combining with the MIMO dynamic switching algorithm. The embodiment of the application is suitable for SU-MIMO (Single-User Multiple-input Multiple-Output), single-User Multiple-input Multiple-Output) and MU-MIMO.

For the convenience of understanding the present embodiment, a method for demodulating multi-stream data disclosed in the embodiment of the present application will be described in detail.

The embodiment of the application provides a multi-stream data demodulation method, which is applied to a wireless communication network adopting MIMO technology, wherein a target AP (Access Point) in the wireless communication network at least supports two demodulation algorithms, and the wireless communication network can be a Wi-Fi network; the method may be performed by an electronic device having data processing capabilities. Referring to a flow chart of a multi-stream data demodulation method shown in fig. 1, the method mainly includes the following steps S102 to S106:

step S102, carrying out correlation pairing on each UE according to a demodulation algorithm supported by a target AP and channel state information between each UE and the target AP in an uplink mode, and obtaining an initial UE pairing result under each demodulation algorithm.

The UE (User Equipment) has a connection requirement with the target AP, and a correlation threshold value adopted during correlation pairing is related to a corresponding demodulation algorithm supported by the target AP. In the uplink mode, the UE sends a data stream to the target AP. The higher the demodulation performance of the demodulation algorithm is, the higher the calculation complexity is, and the lower the correlation threshold value is; for example, the demodulation algorithm includes an LMMSE algorithm and an MLD algorithm, where the LMMSE algorithm corresponds to a correlation threshold value that is less than the correlation threshold value corresponding to the MLD algorithm. It should be noted that, the correlation threshold values corresponding to different demodulation algorithms may be set according to actual requirements, which is not limited herein; the demodulation algorithms supported by the target AP may be, but are not limited to, 2, and in other embodiments, the target AP may support 3 or more demodulation algorithms.

In some possible embodiments, step S102 may be implemented by the following procedure: firstly, determining a correlation threshold value corresponding to each demodulation algorithm supported by a target AP; then generating a channel state matrix according to channel state information between each UE and the target AP measured in an uplink mode; determining a normalized correlation matrix according to the channel state matrix; determining a weak correlation set corresponding to each correlation threshold value according to the normalized correlation matrix; the weak correlation set comprises coordinates corresponding to elements smaller than the corresponding correlation threshold value in the normalized correlation matrix; finally, according to the weak correlation set corresponding to each correlation threshold value, determining an initial UE pairing result of the target AP under the corresponding demodulation algorithm; the initial UE pairing result comprises at least one group of paired UE with correlation between every two paired UE being lower than the corresponding correlation threshold value.

Step S104, according to the current demodulation algorithm applied by the target AP, the target AP is controlled to carry out MU-MIMO transmission on the paired UE in the corresponding initial UE pairing result.

Step S106, in the uplink mode, switching the demodulation algorithm of the target AP according to the mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target AP.

Wherein the first received data symbols correspond to data streams from respective UEs.

In some possible embodiments, step S106 may be implemented by the following procedure: the control target AP starts a first detector corresponding to a first demodulation algorithm to detect data streams from each UE, and calculates a current SINR (Signal to Interference plus Noise Ratio, signal-to-interference-plus-noise ratio) value in real time; according to the current SINR value and the current modulation mode of the target AP, calculating to obtain the current mutual information of the first received data symbol; determining whether the target AP is switched to a second detector corresponding to a second demodulation algorithm according to the magnitude relation between the current mutual information of the first received data symbol and a preset mutual information threshold value; the demodulation performance corresponding to the second demodulation algorithm is better than that corresponding to the first demodulation algorithm.

The embodiment of the application provides two ways for calculating the current mutual information of a first received data symbol, which are respectively as follows:

mode 1: and determining a target mutual information calculation formula according to the current modulation mode of the target AP, and carrying the SINR value into the target mutual information calculation formula to calculate and obtain the current mutual information of the first received data symbol. Corresponding mutual information calculation formulas are arranged in different modulation modes, and the target mutual information calculation formula corresponding to the current modulation mode of the target AP can be obtained directly through searching through the corresponding relation between the preset mutual information calculation formulas and the modulation modes.

Mode 2: the SINR value obtained by searching in a preset display lookup table and mutual information corresponding to the current modulation mode of the target AP are determined to be the current mutual information of the first received data symbol; the display lookup table is generated according to a preset SINR value variation range and a mutual information calculation formula corresponding to a plurality of modulation modes. This approach eliminates the need to perform a computational process, reducing computational complexity.

Alternatively, the modulation scheme may include one or more of BPSK (Binary Phase Shift Keying ), QPSK (Quadrature Phase Shift Keying, quadrature phase shift keying), 16QAM (i.e., QAM (Quadrature Amplitude Modulation, quadrature amplitude modulation) modulation scheme including 16 symbols), 64QAM (i.e., QAM modulation scheme including 64 symbols), MQAM (Multiple Quadrature Amplitude Modulation ).

In particular, when the current mutual information of the first received data symbol is smaller than the mutual information threshold, the target AP is determined to be switched to a second detector corresponding to the second demodulation algorithm. The first demodulation algorithm may employ an LMMSE algorithm, the first detector may be an LMMSE detector, the second demodulation algorithm may employ an MLD algorithm, and the second detector may be an MLD detector.

After switching to the second detector corresponding to the second demodulation algorithm, the mutual information of the first received data symbol may also be calculated in real time and compared with the mutual information threshold, and when the mutual information of the first received data symbol is greater than or equal to the mutual information threshold, the target AP may be switched to the first detector corresponding to the first demodulation algorithm. Thus, the demodulation algorithm is continuously switched based on the mutual information. It should be noted that the mutual information threshold may be set according to actual requirements, which is not limited herein.

The multi-stream data demodulation method provided by the embodiment of the application is applied to a wireless communication network adopting the MIMO technology, a target AP in the wireless communication network at least supports two demodulation algorithms, and when multi-stream data demodulation is carried out, each UE is subjected to correlation pairing according to the demodulation algorithm supported by the target AP and channel state information between each UE and obtained by measuring the target AP in an uplink mode, so as to obtain an initial UE pairing result under each demodulation algorithm; the UE has connection requirements with the target AP, and a correlation threshold value adopted in correlation pairing is related to a corresponding demodulation algorithm supported by the target AP; then according to the current demodulation algorithm applied by the target AP, controlling the target AP to carry out MU-MIMO transmission on the paired UE in the corresponding initial UE pairing result; in the uplink mode, switching the demodulation algorithm of the target AP according to the mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target AP; wherein the first received data symbols correspond to data streams from respective UEs. Therefore, UE pairing of MU-MIMO transmission is realized, and switching of demodulation algorithm is realized based on mutual information, so that transmission efficiency is improved under the condition of ensuring hardware execution complexity.

Further, the embodiment of the application also provides a switching scheme of the demodulation algorithm in the downlink mode, and in the downlink mode, the target AP sends the data stream to the UE. Specifically, the multi-stream data demodulation method further includes: screening target UE supporting at least two demodulation algorithms from each UE according to the demodulation algorithm supported by each UE; in the downlink mode, switching the demodulation algorithm of the target UE according to the mutual information of the second received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target UE; wherein the second received data symbol corresponds to a data stream from the target AP. The specific switching manner of the demodulation algorithm of the target UE may refer to the corresponding content of the target AP, which is not described herein.

The demodulation algorithms supported by the target UE may include, but are not limited to, LMMSE algorithms and MLD algorithms. Taking an LMMSE algorithm and an MLD algorithm as examples, in a downlink mode, each paired UE in an initial UE pairing result under the LMMSE algorithm demodulates a multi-user data stream sent by a target AP by using an LMMSE detector corresponding to the LMMSE algorithm; in the downlink mode, target UEs in each paired UE in the initial UE pairing result under the MLD algorithm use an MLD detector corresponding to the MLD algorithm to demodulate the multi-user data stream sent by the target AP. It should be noted that the demodulation algorithm supported by the target UE is not limited to 2 kinds such as LMMSE algorithm and MLD algorithm, and in other embodiments, the demodulation algorithm supported by the target UE may be 3 kinds or more.

Considering that the initial UE pairing result based on the correlation pairing is not accurate enough, part of the paired UEs may be missed, and the UEs may be re-paired based on the total channel capacity and mutual information of the UEs. Specifically, according to channel state information between each UE and measured by a target AP in an uplink mode, determining the total channel capacity corresponding to each UE; when the mutual information of the first received data symbol is smaller than a preset mutual information threshold under the current demodulation algorithm of the target AP, the UE with the total channel capacity larger than the preset channel capacity threshold is used as the pairing UE, and a target UE pairing result under the current demodulation algorithm is obtained. It should be noted that, the channel capacity threshold may be set according to actual requirements, which is not limited herein.

For ease of understanding, the above-described multi-stream data demodulation method will be exemplarily described below by taking a demodulation algorithm including an LMMSE algorithm and an MLD algorithm as an example.

The embodiment of the application utilizes the measurement CSI (Channel State Information ) of the UE and the AP to pair the UE by calculating the correlation of each spatial data channel (so that the AP can carry out MU-MIMO transmission); and dynamically calculating symbol mutual information of each data channel in real time, dynamically switching the MIMO demodulation algorithm, and re-pairing the UE according to the symbol mutual information so as to increase the feasibility of MU-MIMO.

The embodiment of the application comprises the following specific steps:

for the uplink mode

1. Assuming that under a certain AP, there are k UE connection requirements, the AP measures and channel state information between each UE to obtain a channel state matrix H _M×N Wherein, it is assumed that the AP has M antenna elements, each UE has N antenna elements and n=n×k+.m.

2. Calculate H _M×N Is a correlation matrix R of (1) _HH =HH ^* Wherein H is a conjugate matrix of H.

3. For R _HH Is normalized with the corresponding diagonal elements to adapt to different channel conditions.

4. Two correlation thresholds corrth_l (corresponding to LMMSE algorithm) and corrth_h (corresponding to MLD algorithm) are set, where corrth_h > corrth_l.

5. Selecting normalized R _HH Elements exceeding the correlation threshold value in each row in the matrix record the corresponding column numbers, for example, assuming that the coordinates of an element exceeding the correlation threshold value in a certain row are (i, j), the correlation between the UE to which the antenna of the i row belongs and the UE to which the antenna of the j row belongs is stronger, and the same group is marked as omega _i 。

6. For UEs belonging to antennas of other columns below the correlation threshold, they are labeled Λ _i 。

Namely, k UE are sequentially divided into a plurality of groups according to the channel correlation according to a high threshold CorrTh_H and a low threshold CorrTh_L, and the groups which are lower than a correlation threshold value, namely weak correlation, are classified as the same group Λ _i 。

MU-MIMO pairing of aps: from different Λ _i The UE pair is selected.

When demodulating a data stream from a UE, the ap first activates an LMMSE linear detector (i.e., LMMSE detector:e is an identity matrix), and calculates SINR in real time,wherein the diag function represents a diagonal matrix.

9. According to the current modulation mode (including modulation order), the mutual information I of the received data symbols is calculated according to the following Table 1, or a LUT (Look-Up Table) Table is generated according to the SINR conversion range in the Table 1, and the mutual information I of the received data symbols is obtained by searching in the LUT Table. Setting a mutual information threshold (i.e. a mutual information threshold value) I _th When I < I _th When the AP activates the MLD nonlinear detector (i.e., MLD detector)Where x is the transmitted data stream, y is the received data symbol, O ^Q Is the constellation point set under Q-order modulation.

TABLE 1

For downlink mode

10. When the UE pairs according to the low threshold, the UE demodulates the MU data stream sent by the AP using the LMMSE detector, and performs dynamic switching of the demodulation algorithm with reference to steps 8 and 9.

11. When the paired UEs are paired according to the high threshold, the paired UEs need to have MLD demodulation capability, and use an MLD detector to demodulate MU data streams sent by the AP.

12. And (3) the uplink mode is paired again: the AP calculates the channel capacity of each space flow between each UE and the AP according to the measured UE channel state informationWherein N is _s P is the total number of effective channels _i For the transmission power of the ith channel data stream, lambda _i Is the ith non-zero eigenvalue of the channel matrix (obtained by decomposing the eigenvalue of the channel matrix H),>is the work of noiseThe rate and the noise power may be constant or real-time detection. The spatial data streams are ordered based on the mutual information of step 9. All satisfy C _CSIT ＞C _th I < I _th The UE to which the data stream belongs performs MU pairing.

The method for dynamically switching the LMMSE detector and the MLD detector based on the channel correlation and the symbol mutual information ensures that a receiver fully utilizes the optimal transmission efficiency of a space channel under the condition of ensuring the complexity of hardware execution.

Corresponding to the above-mentioned multi-stream data demodulation method, the embodiment of the present application further provides a multi-stream data demodulation device, where the device is applied to a wireless communication network adopting MIMO technology, and a target AP in the wireless communication network supports at least two demodulation algorithms. Referring to a schematic structure of a multi-stream data demodulation apparatus shown in fig. 2, the apparatus includes:

the first pairing module 201 is configured to perform correlation pairing on each UE according to a demodulation algorithm supported by the target AP and channel state information between the target AP and each UE measured in an uplink mode, so as to obtain an initial UE pairing result under each demodulation algorithm; the UE has connection requirements with the target AP, and a correlation threshold value adopted in correlation pairing is related to a corresponding demodulation algorithm supported by the target AP;

a transmission control module 202, configured to control, according to a current demodulation algorithm applied by the target AP, the target AP to perform MU-MIMO transmission on the paired UEs in the corresponding initial UE pairing result;

a first switching module 203, configured to switch, in an uplink mode, a demodulation algorithm of the target AP according to mutual information of a first received data symbol obtained based on a current demodulation algorithm and a current modulation mode of the target AP; wherein the first received data symbols correspond to data streams from respective UEs.

Further, the first pairing module 201 is specifically configured to: determining a correlation threshold value corresponding to each demodulation algorithm supported by the target AP; generating a channel state matrix according to channel state information between each UE and the target AP measured in an uplink mode; determining a normalized correlation matrix according to the channel state matrix; according to the normalized correlation matrix, determining a weak correlation set corresponding to each correlation threshold value; the weak correlation set comprises coordinates corresponding to elements smaller than the corresponding correlation threshold value in the normalized correlation matrix; according to the weak correlation set corresponding to each correlation threshold value, determining an initial UE pairing result of the target AP under a corresponding demodulation algorithm; the initial UE pairing result comprises at least one group of paired UE with correlation between every two paired UE being lower than the corresponding correlation threshold value.

Further, the first switching module 203 is specifically configured to: the control target AP starts a first detector corresponding to a first demodulation algorithm to detect data streams from each UE, and calculates the current SINR value in real time; according to the current SINR value and the current modulation mode of the target AP, calculating to obtain the current mutual information of the first received data symbol; determining whether the target AP is switched to a second detector corresponding to a second demodulation algorithm according to the magnitude relation between the current mutual information of the first received data symbol and a preset mutual information threshold value; the demodulation performance corresponding to the second demodulation algorithm is better than that corresponding to the first demodulation algorithm.

Further, the first switching module 203 is further configured to: determining a target mutual information calculation formula according to the current modulation mode of the target AP, and bringing the SINR value into the target mutual information calculation formula to calculate and obtain the current mutual information of the first received data symbol; or,

the SINR value obtained by searching in a preset display lookup table and mutual information corresponding to the current modulation mode of the target AP are determined to be the current mutual information of the first received data symbol; the display lookup table is generated according to a preset SINR value variation range and a mutual information calculation formula corresponding to a plurality of modulation modes.

Further, referring to the schematic structural diagram of another multi-stream data demodulation apparatus shown in fig. 3, on the basis of fig. 2, the apparatus further includes:

a second switching module 301, configured to screen out target UEs supporting at least two demodulation algorithms from the UEs according to the demodulation algorithm supported by each UE; in the downlink mode, switching the demodulation algorithm of the target UE according to the mutual information of the second received data symbol obtained based on the current demodulation algorithm and the current modulation mode of the target UE; wherein the second received data symbol corresponds to a data stream from the target AP.

Further, the demodulation algorithm comprises a Linear Minimum Mean Square Error (LMMSE) algorithm and a Maximum Likelihood Decoding (MLD) algorithm, wherein a correlation threshold value corresponding to the LMMSE algorithm is smaller than a correlation threshold value corresponding to the MLD algorithm; in a downlink mode, each paired UE in an initial UE pairing result under an LMMSE algorithm demodulates a multi-user data stream sent by a target AP by using an LMMSE detector corresponding to the LMMSE algorithm; in the downlink mode, target UEs in each paired UE in the initial UE pairing result under the MLD algorithm use an MLD detector corresponding to the MLD algorithm to demodulate the multi-user data stream sent by the target AP.

Further, as shown in fig. 3, the apparatus further includes:

a second pairing module 302, configured to determine a total channel capacity corresponding to each UE according to channel state information between each UE and a target AP in an uplink mode; when the mutual information of the first received data symbol is smaller than a preset mutual information threshold under the current demodulation algorithm of the target AP, the UE with the total channel capacity larger than the preset channel capacity threshold is used as the pairing UE, and a target UE pairing result under the current demodulation algorithm is obtained.

The multi-stream data demodulation device provided in this embodiment has the same implementation principle and technical effects as those of the multi-stream data demodulation method embodiment, and for brevity, reference may be made to corresponding contents in the multi-stream data demodulation method embodiment described above where the multi-stream data demodulation device embodiment is not mentioned.

As shown in fig. 4, an electronic device 400 provided in an embodiment of the present application includes: a processor 401, a memory 402 and a bus, the memory 402 storing a computer program executable on the processor 401, the processor 401 executing the computer program to implement the above-described multi-stream data demodulation method when the electronic device 400 is running, by bus communication between the processor 401 and the memory 402.

Specifically, the memory 402 and the processor 401 described above can be general-purpose memories and processors, and are not particularly limited herein.

The embodiment of the application also provides a computer storage medium, on which a computer program is stored, which when being executed by a processor performs the multi-stream data demodulation method described in the previous method embodiment. The computer storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a RAM, a magnetic disk, or an optical disk, etc., which can store program codes.

Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. A multi-stream data demodulation method, characterized in that it is applied to a wireless communication network adopting MIMO technology, and a target AP in the wireless communication network supports at least two demodulation algorithms; the multi-stream data demodulation method includes:

2. The method for demodulating multi-stream data according to claim 1, wherein said performing correlation pairing on each UE according to the demodulation algorithm supported by the target AP and channel state information between each UE measured by the target AP in an uplink mode, to obtain an initial UE pairing result of the target AP under each demodulation algorithm, includes:

3. The method for demodulating multi-stream data according to claim 1, wherein said switching the demodulation algorithm for the target AP according to mutual information of the first received data symbol obtained based on the current demodulation algorithm and the current modulation scheme for the target AP includes:

4. The method for demodulating the multi-stream data according to claim 3, wherein said calculating the current mutual information of the first received data symbol according to the SINR value and the current modulation scheme of the target AP includes:

5. The multi-stream data demodulation method according to claim 1, characterized in that the multi-stream data demodulation method further comprises:

6. The method of demodulating multi-stream data according to claim 5, wherein the demodulation algorithm includes a linear minimum mean square error LMMSE algorithm and a maximum likelihood decoding MLD algorithm, and a correlation threshold corresponding to the LMMSE algorithm is smaller than a correlation threshold corresponding to the MLD algorithm; in a downlink mode, each paired UE in the initial UE pairing result under the LMMSE algorithm demodulates the multi-user data stream sent by the target AP by using an LMMSE detector corresponding to the LMMSE algorithm; in the downlink mode, the target UE in each paired UE in the initial UE pairing result in the MLD algorithm demodulates the multi-user data stream sent by the target AP by using the MLD detector corresponding to the MLD algorithm.

7. The multi-stream data demodulation method according to claim 1, wherein after the mutual information of the first received data symbol obtained according to the current demodulation algorithm and the current modulation scheme based on the target AP, the multi-stream data demodulation method further comprises:

8.A multi-stream data demodulation apparatus, characterized by being applied to a wireless communication network employing MIMO technology, a target AP in the wireless communication network supporting at least two demodulation algorithms; the multi-stream data demodulation apparatus includes:

9. An electronic device comprising a memory, a processor, the memory having stored therein a computer program executable on the processor, characterized in that the processor implements the multi-stream data demodulation method of any one of claims 1-7 when the computer program is executed.

10. A computer storage medium having a computer program stored thereon, characterized in that the computer program, when executed by a processor, performs the multi-stream data demodulation method of any one of claims 1-7.