基于合并码本的码字位置序号调制SCMA方案

doi:10.12305/j.issn.1001-506X.2024.07.32

Abstract

Abstract:

To meet the rigorous demands for reliability and spectral efficiency (SE) in the beyond-5th generation mobile network (5G) and the upcoming 6th generation mobile network (6G), a merging codebook based codeword position index modulation scheme for sparse code multiple access (SCMA) is proposed for the uplink SCMA. The scheme expands the codeword position in the time domain, allowing the codeword positions to be fully populated and carry additional information bits by their index, and provides flexibility in adjusting the system SE by changing the codeword position number and the index modulation order. Furthermore, a corresponding joint detection algorithm based on message passing algorithm (MPA) is designed and the design criteria of the merging codebook are given. System analysis and simulation results show that compared with other index modulation schemes, the proposed scheme better balances reliability and SE, and also has advantages in bit error rate (BER) performance and robustness.

Key words: sparse code multiple access (SCMA), spectral efficiency (SE), codeword position, index modulation, merging codebook

CLC Number:

TN929.5

Yanbing YANG, Jing LEI, Ke LAI. Merging codebook based codeword position index modulation scheme for SCMA[J]. Systems Engineering and Electronics, 2024, 46(7): 2498-2508.

Figures/Tables 10

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References 30

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g₂	$\mathcal{W}_{(1)}^{\prime}$	$\mathcal{W}_{(2)}^{\prime}$	对应TU的格式
00	{1, 3}	{2, 4}	X_{j, w₁}⁽¹⁾, X_{j, w}⁽²⁾, X_{j, w₂}⁽¹⁾, X_{j, w₂}⁽²⁾
01	{2, 4}	{1, 3}	X_{j, w₁}⁽²⁾, X_{j, w}⁽¹⁾, X_{j, w₂}⁽²⁾, X_{j, w₂}⁽¹⁾
10	{2, 3}	{1, 4}	X_{j, w}⁽²⁾, X_{j, w₁}⁽¹⁾, X_{j, w₂}⁽¹⁾, X_{j, w₂}⁽²⁾
11	{1, 4}	{2, 3}	X_{j, w₁}⁽¹⁾, X_{j, w₁}⁽²⁾, X_{j, w₂}⁽²⁾, X_{j, w₂}⁽¹⁾

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Merging codebook based codeword position index modulation scheme for SCMA

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