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SCMA multi-user detection method based on weight factor message passing

A multi-user detection and weighting factor technology, applied in the transmission system, digital transmission system, forward error control, etc., can solve problems such as slow convergence speed, high computational complexity, and poor system performance

Inactive Publication Date: 2017-12-22
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

However, in practical engineering applications, there are problems of slow convergence and poor system performance, and the computational complexity is relatively high, which is not conducive to the realization of hardware

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  • SCMA multi-user detection method based on weight factor message passing
  • SCMA multi-user detection method based on weight factor message passing
  • SCMA multi-user detection method based on weight factor message passing

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Embodiment Construction

[0049] The technical solutions in the embodiments of the present invention will be described clearly and in detail below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only some of the embodiments of the invention.

[0050] The technical scheme that the present invention solves the problems of the technologies described above is:

[0051] According to the transmission conditions and the procedure of the detection process, the following parameters are initialized as shown in Table 1. The sparse spreading matrix corresponding to the Tanner graph is Such as Image 6 As shown; the user bit information is mapped to the corresponding codeword x by the SCMA encoder, and the codewords of all users are superimposed and transmitted through the channel, and the receiving end receives the signal In the formula Indicates the codeword sent by the jth user, Indicates the channel vector of the jth user, z is Ga...

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Abstract

The invention provides an SCMA multi-user detection method based on weight factor message passing, belongs to the field of signal detection of wireless communication systems, and relates to a sparse code multi-address access (SCMA) uplink communication system multi-user detection method which is high in convergence speed, excellent in performance and low in complexity and can be used for solving the multi-user detection problem in a 5G mobile communication alternative multi-address access technology. According to the method, the initial condition probabilities of all superposition constellation points are changed by introducing weight factors alpha on the basis of a message passing algorithm (MPA) to enable the constellation points near a receiving signal to be capable of obtaining higher initial condition probabilities, therefore, the convergence time of the message passing iteration process is shortened, the iteration result is more accurate, and good comprise between the performance and the complexity of an SCMA system is achieved. The method can be applied to SCMA system-based multi-user detection in next generation mobile communication.

Description

technical field [0001] The invention belongs to the field of signal detection of wireless communication systems, and in particular relates to a SCMA multi-user detection method based on weight factor message transmission. Background technique [0002] 1) Multiple access has always been one of the core technologies of the physical layer of wireless communication, which enables the base station to distinguish and serve multiple end users at the same time. In order to meet the four main technical scenarios of continuous wide-area coverage, high-capacity hotspots, low-latency high-reliability, and low-power large-scale connections in 5G, Huawei proposed a SCMA (Sparse code multiple access, sparse code multiple access) technology, figure 2 It is an SCMA uplink communication system model (6 users, 4 resource blocks). Through superimposed transmission of multi-user information on the same resource, the advanced receiving algorithm is used to separate multi-user information on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00
CPCH04L1/0048H04L1/005
Inventor 陈发堂贾东升耿明月李小文王丹王华华刘宇刘燕
Owner CHONGQING UNIV OF POSTS & TELECOMM
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