Non-orthogonal multiple access system codebook design method based on resource block constellation distance

Abstract

The invention provides a non-orthogonal multiple access system codebook design method based on a resource block constellation distance. The non-orthogonal multiple access system codebook design method comprises the following steps: firstly, determining parameters J, M, N and K in an SCMA codebook according to user requirements; determining a mapping matrix of associated users and resource blocks in the codebook according to a Latin criterion; constructing an energy normalized N-dimensional constellation S0; calculating to obtain an optimal element coefficient and an optimal rotation angle through a particle swarm optimization (PSO) algorithm according to a criterion of maximizing the sum of codeword distances between constellation points of a resource block; finally, determining an optimal user constellation function according to the optimal element coefficient and the optimal rotation angle, and performing codeword rearrangement on a user constellation set corresponding to the optimal user constellation function; and distributing the code words before and after rearrangement to the mapping matrix, so that the SCMA multi-user codebook is obtained. According to the invention, a larger integer gain can be obtained, and the anti-noise performance of the SCMA system under a Gaussian channel is improved.

Description

technical field [0001] The present invention relates to the field of wireless communication, in particular to a codebook design scheme for a non-orthogonal multiple access system that maximizes the sum of squares of Euclidean distances between resource block constellation points based on the energy normalization of codebook resource blocks. Background technique [0002] With the rapid development of mobile Internet services and Internet of Things business applications, mobile Internet and Internet of Things will become the main driving force for the development of mobile communications in the future. Higher requirements are put forward for time and delay indicators, which pose a severe challenge to the existing OMA solution represented by OFDMA. The new non-orthogonal multiple access (NOMA) technology solution represented by overlay transmission has become a 5G One of the key technologies in mobile communication. [0003] Sparse Code Multiple Access (SCMA) has obvious advan...

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Problems solved by technology

Finally, constellation operations such as phase rotation and power offset are performed based on the parent constellation point to obtain the codebooks of different users. The above construction methods are used as a guide, and the idea of ​​SCMA codebook design becomes clear, but the complexity of its implementation is high, and Not available for high dimensional constellations

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