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Multi-user shared access technology uplink serial first and then parallel multi-user detection method

A multi-user detection and shared access technology, applied in the field of uplink multi-user detection, can solve the problems of poor detection performance, poor detection performance of detection algorithms, and large processing delay, so as to improve detection performance and reduce multiple access. the effect of interference

Active Publication Date: 2019-04-16
圣昌(鸡西)科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0033] The purpose of the present invention is to solve the existing MMSE-SIC detection algorithm computational complexity is high, processing delay is large; MMSE-PIC detection algorithm detection performance is poor; -The SIC is smaller, and the detection performance is better than MMSE-PIC, but the detection performance is still poor, and the multi-user shared access technology uplink is proposed.

Method used

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  • Multi-user shared access technology uplink serial first and then parallel multi-user detection method
  • Multi-user shared access technology uplink serial first and then parallel multi-user detection method
  • Multi-user shared access technology uplink serial first and then parallel multi-user detection method

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specific Embodiment approach 1

[0067] Specific implementation mode 1: The specific process of the multi-user detection method of the multi-user shared access technology uplink in this embodiment is as follows:

[0068] "Serial before parallel" multi-user detection algorithm

[0069] Each iteration of the MMSE-PIC detection algorithm needs to perform MMSE detection on all users, as well as reconstruct and eliminate the MAI generated by all other users except itself. Performance is poor. If the user signal with strong signal can be detected and eliminated as interference before PIC, this is equivalent to removing the largest multiple access interference, and then using PIC to detect the data of other users can get better Detection performance. The essential idea is to perform SIC detection on the users with stronger signals first, and then perform PIC detection on the remaining users with weaker signals, which is equivalent to "serial first, then parallel" multi-user detection.

[0070] The detection algor...

specific Embodiment approach 2

[0093] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the signal R in the step 1 is expressed as:

[0094]

[0095] K represents the number of users, Indicates the expanded data of the kth user, H k Represents the channel coefficient of the kth user, ideal channel estimation is adopted in the present invention; N is the mean value is 0, and the variance is σ 2 Gaussian white noise; S k Indicates the modulated data transmitted by the kth user, W k Indicates the spreading sequence randomly selected by the kth user, and the symbol represents the multiplication of the corresponding position elements of the two matrices; the symbol means W k Each element of the nth column of H k Multiply the nth element of , where n is a positive integer; F k is the equivalent channel coefficient of the kth user;

[0096] According to (1), the equivalent channel coefficient of the kth user is obtained

[0097] Other steps and parameters are the same as ...

specific Embodiment approach 3

[0098] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the process of performing MMSE detection on the signal R in the step three one is:

[0099] solve matrix the matrix Multiplied by R, we get

[0100] is the detection coefficient used for MMSE detection of the received signal.

[0101] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a serial-first parallel-second multi-user detection method for an MUSA (Multi-User Shared Access) uplink, relates to a multi-user detection method for an uplink, and aims to solve the problems that: the existing MMSE-SIC detection algorithm is high in calculation complexity and processing delay; the detection performance of an MMSE-PIC detection algorithm is poor; furthermore, compared with the MMSE-SIC, a quasi parallel interference elimination detection algorithm is relatively low in calculation complexity and processing delay; compared with the MMSE-PIC, the quasi parallel interference elimination detection algorithm is better in detection performance; but, the detection performance is still poor. The process comprises the steps of: assuming that K users are at atransmitting terminal, randomly selecting an extended sequence by each user, then, extending respective modulation symbols by each user according to the randomly selected extended sequence, then transmitting the respective modulation symbols through a Gaussian white noise channel, and receiving a signal at a receiving end; calculating the SINR of each user; setting M; performing SIC detection onall users, the SINR<k> of which is greater than or equal to M; and performing PIC detection on all the users, the SINR<k> of which is less than or equal to M. The method disclosed by the invention isused in the field of multi-user detection.

Description

technical field [0001] The invention relates to an uplink multi-user detection method. Background technique [0002] Non-orthogonal multiple access technology, basic multi-user detection algorithm, MUSA uplink multi-user detection algorithm [0003] 1. Non-orthogonal multiple access technology [0004] Due to the rapid development of the mobile Internet and the Internet of Things, as well as the increasing demands of users, the existing fourth-generation mobile communication system (4G) has been unable to meet the demand, so the fifth-generation mobile communication system (5G) was proposed. Since the orthogonal multiple access technologies used in traditional mobile communication systems, including FDMA, TDMA, CDMA and OFDMA, cannot meet the needs of future communications with large traffic volumes, non-orthogonal multiple access (Non-orthogonal multiple access) is proposed in 5G. -Orthogonal Multiple Access, NOMA) technology. [0005] Existing NOMA technologies include:...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04J11/00
CPCH04J11/0026H04J11/0046H04L1/0045H04L1/0048H04L1/005H04L1/0052H04L1/0061
Inventor 吴少川左润东张文彬魏宇明马康健周晓康刘小庆宋言午王楠
Owner 圣昌(鸡西)科技开发有限公司
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