Modulation codebook design method for sparse code multiple access system

Abstract

The invention provides a modulation codebook design method for a sparse code multiple access system. The method comprises the following steps: firstly, calculating the number of resource multiplexingusers on each carrier according to current system parameters, comprising the number of carrier resources, the number of users and the number of carrier resources occupied by each user, and designing amapping relationship between the users and the carrier resources; then, designing a modulation constellation graph of each user according to the number of the resource multiplexing users on each carrier and the number of constellation points of each user on each dimension; and finally, obtaining the modulation constellation graphs of the resource multiplexing users on all carriers according to the mapping relationship between the users and the carrier resources, obtaining the mapping relationship between bit sequences and modulation constellation point symbols on different constellation dimensions according to symbol interleaving transformation, and obtaining a final modulation codebook constellation graph. The high-dimensional codebook design method provided by the invention has the advantages of being simple in operation steps, being advantageous for implementation, and being able to bring better transmission performance to the system.

Description

technical field [0001] The invention relates to the technical field of non-orthogonal multiple access, in particular to a modulation codebook design method for sparse code multiple access systems. Background technique [0002] The ever-increasing demand for data services on the mobile Internet, as well as people's business needs in various scenarios such as work and entertainment in the Internet of Things era, have led to a sudden increase in the industry's requirements for 5G mobile communication systems. For example, the 5G communication system needs to achieve high spectral efficiency and meet the access requirements of a large number of users, especially in the massive machine type communication (mMTC) scenario, it is necessary to deal with the access problem of a large number of users. In traditional wireless communication systems, signals transmitted by different users are distinguished through multiple access technologies, the most common ones are time division multip...

AI Technical Summary

Problems solved by technology

The existing high-dimensional codebook design is divided into two steps: the design of the mother constellation and the operation of the mother constellation by different users. The design steps are quite cumbersome, and the codebook design steps involve the constellation diagrams on all carrier resources, which is not conducive to optimization.

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