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A scma uplink communication system multi-user detection method and device

A technology of multi-user detection and communication system, applied in the field of multi-user detection of SCMA uplink communication system, can solve the problems of high multi-user detection complexity and high iteration times, and achieve the effect of solving multi-user detection complexity and high iteration times

Active Publication Date: 2021-10-15
WUHAN HONGXIN TECH DEV CO LTD
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Problems solved by technology

[0028] In view of this, the present application provides a method and device for multi-user detection in an SCMA uplink communication system, which can effectively solve the problem of high multi-user detection complexity and iteration times in the alternative multiple access technology for next-generation mobile communications

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  • A scma uplink communication system multi-user detection method and device
  • A scma uplink communication system multi-user detection method and device
  • A scma uplink communication system multi-user detection method and device

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Embodiment Construction

[0072] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0073] According to the transmission conditions and the procedure of the detection process, initialize the following parameters:

[0074] The number of user nodes J=6, the number of codewords in the codebook M=4, the length of codewords K=4, the system overload rate The channel model is an AWGN (White Gaussian Noise) channel, and the sparse spreading matrix is The user information bits are mapped to the corresponding codeword x by the SCMA encoder, and all user codewords are supe...

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Abstract

This application discloses a method and device for multi-user detection in an SCMA uplink communication system. The method includes: under Gaussian white noise conditions, using channel estimation to calculate the value of the probability density function, and screening users for codewords. information, carry out initialization processing, set the maximum number of iterations, in the iterative process less than or equal to the maximum number of iterations, calculate all the code word messages from the resource node to the user node and the messages from the user node to the resource node, and reach the At the maximum number of iterations, the probability of the codeword is calculated, the soft information of the data bits is calculated based on the probability of the codeword, and the judgment is made based on the soft information of the data bits. The present application can effectively solve the problems of high multi-user detection complexity and iteration times in the alternative multiple access technology of the next generation mobile communication.

Description

technical field [0001] The present application relates to the technical field of signal detection of a wireless communication system, and in particular to a multi-user detection method and device for an SCMA (Sparse code multiple access, sparse code multiple access) uplink communication system. Background technique [0002] In order to meet the needs of the fifth-generation mobile communication, such as large capacity, massive connections, and low-latency access, SCMA technology was proposed, such as image 3 As shown, it is the SCMA uplink communication system model; since the spreading code used by SCMA is a sparse code, that is, the baseband data of each user is only subjected to non-zero bit spread spectrum modulation on a small number of chips, multiple users can share a period of time The frequency resource does not have to be strictly orthogonal, and there will be no serious interference between users, and the overload system can be realized. [0003] In the SCMA syst...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/30H04B17/382
Inventor 张雪婉彭琛郭尊礼董宝江
Owner WUHAN HONGXIN TECH DEV CO LTD