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Method for reducing multi-user detection complexity

A multi-user detection and complexity technology, applied in the direction of forward error control, digital transmission system, electrical components, etc., can solve the problem of high complexity and difficult to implement, and achieve the effect of reducing the complexity of decoding

Inactive Publication Date: 2018-03-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

The maximum a posteriori probability algorithm is the optimal multi-user detection scheme for the SCMA system, but its complexity is too high and difficult to implement

Method used

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  • Method for reducing multi-user detection complexity
  • Method for reducing multi-user detection complexity
  • Method for reducing multi-user detection complexity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0051] In this embodiment, a Matlab simulation platform is used for experiments.

[0052] The purpose of this example is achieved through the following steps:

[0053] S1. Setting SCMA system parameters. The system parameters in this example are as follows: the number of users J=6, the number of time-frequency resources K=4, the simulated channel is AWGN, the overload factor is λ=150%, and the number of simulations is 10 5 , the maximum number of iterations is t max , the codebook used is shown in the table below:

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060] S2. Initialize the message delivery probability value, t = 1, j ∈ {1,...,J}, k ∈ ζ j .

[0061] S3. Determine the Gaussian threshold value Δ according to the current communication quality requirement.

[0062] S4. Determine whether t exceeds the preset maximum number of iterations, if t≤t max , then perform the following message update; if t>t max , the iterative update of the m...

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Abstract

The invention belongs to the technical field of wireless communication and specifically relates to a method for reducing multi-user detection complexity. According to the method, SCPs (Superposed Constellation Points) in an area within which the distance between receiving signals and sending signals is smaller than a Gaussian threshold are utilized and the SCPs out of the Gaussian threshold area are discarded, in this way, the complexity of an MPA (Message Passing Algorithm) can be greatly reduced, and the BER (Bit Error Rate) performance is basically not damaged. According to the method, thedecoding complexity of an SCMA (Sparse Code Multiple Access) system can be greatly reduced; through selection of the suitable Gaussian threshold, the decoding performance is basically not damaged; theEuclidean distance between receiving signal constellation pints and the sending SCPs submits to Gaussian distribution, so the threshold can be adaptively determined through full utilization of Gaussian distribution features; through selection of different thresholds, the compromise between the detection complexity and the decoding performance is achieved; and moreover, 5G communication scenes with different quality requirements can be satisfied.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular relates to a method for reducing the complexity of multi-user detection, more specifically a method for reducing the complexity of message passing (Message Passing Algorithm, MPA) in an SCMA system based on a Gaussian threshold. Background technique [0002] Driven by the rapid development of mobile Internet services, the access of a large number of terminal devices and the ultimate user experience in the future will pose huge challenges to mobile communications. Therefore, in order to meet the needs of future communication, 5G communication system came into being, among which wireless air interface technology is a hot issue in current 5G research. Facing these challenges in 5G, the traditional orthogonal multiple access technology can no longer meet its requirements, so some non-orthogonal multiple access technologies have been proposed. Sparse Code Multiple Access ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04W72/04
CPCH04L1/0048H04L1/005H04L1/0052H04W72/0446H04W72/0453
Inventor 杨霖马新迎
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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