Game theory-based SCMA system codebook and power allocation method

Abstract

The invention discloses a game theory-based SCMA system codebook and power allocation method. The method comprises the steps that 1, it is assumed that in an SCMA down link cellular system, a given SCMA block orthogonal resource block has M orthogonal subcarriers, and H nonzero elements exist in an SCMA encoder, the transmission layer number is the codebook number J, the downlink user number is K,each user performs data transmission of the user only through one transmission layer, then K=J, and a corresponding relation between the J codebooks and the M orthogonal subcarriers meets an incidence matrix F; 2, codebook allocation is conducted on the basis of the maximum sum of interference powers and noise powers, and iteration is conducted multiple times until all the codebooks are allocated; and 3, for the codebooks allocated to the users, a game model is built on the basis of a game theory to conduct power allocation, and iteration is conducted multiple times until all the powers are allocated. The method has the advantages of being capable of effectively increasing the throughput capacity and speed of an SCMA system and decreasing the bit error rate of the system.

Description

technical field [0001] The invention relates to the field of wireless communication. More specifically, the present invention relates to a game theory-based SCMA system codebook and power allocation method. Background technique [0002] In wireless communication systems, Sparse Code Multiple Access (SCMA) is a multiple access technique, that is, how a base station serves and differentiates multiple users simultaneously. The performance of sparse code multiple access system mainly depends on the research of SCMA codebook design and resource allocation algorithm. The main resources in communication are bandwidth and power. In the case of limited bandwidth and power, each user wants to occupy more spectrum resources. In the sparse code multiple access system, the same SCMA coder shares the same spectrum resources among users on the same layer, and there is interference between them. On a specific SCMA resource block, since the orthogonal subcarriers actually associated with ...

AI Technical Summary

Problems solved by technology

In the SCMA system, due to the concept of sparse spread spectrum, the data of different users are spread on limited orthogonal subcarriers in the frequency domain. Users on the same orthogonal subcarrier will interfere with each other, and channel state information cannot be shared between these users. , so each user can only maximize its performance in a distributed manner, resulting in channel congestion and low system throughput

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