Mixed sparse-code multiple access method

Abstract

The invention provides a mixed sparse-code multiple access method. The method comprises the following steps of carrying out channel coding on data of a plurality of user layers and acquiring a plurality of bit streams, and equally dividing the plurality of bit streams into a first bit stream and a second bit stream; mapping the first bit stream to a first constellation graph and mapping the second bit stream to a second constellation graph; carrying out mapping processing on a constellation point of the first constellation graph and a constellation point of the second constellation graph through a mapping matrix so as to acquire a first codeword corresponding to the first bit stream and a second codeword corresponding to the second bit stream; carrying out arrangement processing on a nonzero element in the first codeword and a nonzero element in the second codeword through an arrangement matrix so as to acquire an overlapping mode of each user layer on a time frequency resource; and according to the overlapping mode of each user layer on the time frequency resource, carrying out data transmission. In the invention, initial information quality of a MPA receiver and convergence reliability of a first detected signal during each MPA receiver iteration process are increased.

Description

technical field [0001] The invention relates to wireless communication technology, in particular to a hybrid sparse code multiple access method. Background technique [0002] Low latency, high reliability, low power consumption, and massive access are the main technical features of the future 5G wireless transmission network. In wireless communication systems, multiple access is a major technique. Generally, most communication systems adopt orthogonal multiple access technology. Orthogonal multiple access technology still cannot meet the requirements of 5G system. Non-orthogonal multiple access has become a research hotspot in recent years. Sparse Code Multiple Access (SCMA) is a non-orthogonal multiple access technology based on a multi-dimensional codebook, and its structure is similar to a low density signature (LDS). LDS is different from the traditional orthogonal spread spectrum sequence, it is a kind of sparse spread spectrum sequence. In the SCMA system, first t...

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Problems solved by technology

[0004] The present invention provides a mixed sparse code multiple access method to solve the problem that the initial information of the MPA module in the SCMA receiver is easily affected by multipath and noise and the first detected data layer in each MPA module iteration process Unsatisfactory convergence reliability and other issues

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