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SCMA codebook design method based on moth fire suppression algorithm

A technology of moths to flames and design methods, which is applied in the field of non-orthogonal multiple access system codebooks, to achieve the effect of improving the bit error rate and realizing simple effects

Active Publication Date: 2021-12-07
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is, in order to reduce the design complexity of SCMA codebook, provide a kind of method that uses moth to flame algorithm to search user's code word parameter in SCMA codebook design

Method used

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  • SCMA codebook design method based on moth fire suppression algorithm
  • SCMA codebook design method based on moth fire suppression algorithm
  • SCMA codebook design method based on moth fire suppression algorithm

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Embodiment Construction

[0025] The SCMA codebook design is regarded as the optimization of user codeword parameters, and the optimized objective function is the bit error rate function of the SCMA system, namely:

[0026]

[0027]

[0028] Wherein, f_BER represents the bit error rate function of the SCMA system, EbN0 represents the ratio of each symbol energy and noise energy spectral density in the SCMA codebook, F represents the factor graph matrix of the SCMA codebook, CB={CB 1 ,CB 2 ,...,CB J} represents the codebook set of each user, J represents the number of users in the SCMA system, K represents the number of resource blocks, d f Represents the number of users multiplexed on each resource block, S i Represents energy-normalized Nth-order user codewords of length M, E{||S i || 2} is the user code word S i energy of.

[0029] The expression of is as follows:

[0030]

[0031] According to the factor graph matrix, the codebook is obtained, so the codebook design problem becomes...

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Abstract

The invention provides an SCMA codebook design method based on a moth fire suppression algorithm, and the method comprises the steps: setting user code words according to parameters in an SCMA codebook, and determining optimized parameters; and finally, taking the minimum bit error rate as a criterion for the SCMA codebook to be optimized, and obtaining an optimal parameter value of a parameter to be optimized through a moth fire suppression algorithm, thereby obtaining an optimal SCMA codebook according to the optimal parameter value. The method can be suitable for SCMA codebook design under different channels, and only SCMA channel parameters in the bit error rate function f_BER need to be replaced under different channels; along with the increase of the number of users, the complexity of the moth fire suppression algorithm is increased slowly, and the implementation is simple. According to a simulation result, under a Gaussian channel and a Rayleigh channel, the bit error rate of the codebook obtained through the method is obviously improved compared with other codebooks.

Description

technical field [0001] The present invention relates to wireless communication technology, in particular to a non-orthogonal multiple access system codebook technology based on the moth-flame algorithm. Background technique [0002] In recent years, with the continuous development of society and the continuous improvement of communication technology, mobile communication system has become one of the most critical information networks in human society. The fifth-generation mobile communication system 5G (Fifth-Generation) has high requirements for higher spectral efficiency, large-scale connections and lower delays. The traditional Orthogonal Multiple Access (OMA) technology Due to the orthogonality, the number of resource blocks must be consistent with the number of users, which cannot meet the requirements of 5G. Non-orthogonal multiple access NOMA (Non-Orthogonal Multiple Access) technology is a technology to meet the needs of 5G. It can support overloaded systems with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B7/0456H04B17/336
CPCH04B7/0456H04B7/0473H04B7/0482H04B17/336Y02D30/70
Inventor 何超何春朱立东王剑
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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