基于子帧组合扩频和压缩感知的大规模免授权多址接入方案

doi:10.12305/j.issn.1001-506X.2025.11.32

Abstract

Abstract:

Aiming at the terminal access problem for massive machine-type communication in sparse burst scenarios, a subframe-combined spread spectrum and compressed sensing based massive grant-free multiple access scheme is proposed. First, a subframe-combined spread spectrum uplink transmission mode is designed, which supports users to transmit service data on multiple subframes with different spread spectrum sequences, thereby enhancing user characteristics to reduce multiple access interference. Subsequently, a method for generating subframe spreading codebooks based on cyclic shift is designed, and an uplink multiple access transmission model and a multi-user signal compressive sensing model are established. Finally, a subframe-combined spread spectrum assisted simultaneous subspace pursuit algorithm is put up to detect active users and reconstruct multi-user signal. Simulation results show that, compared to traditional methods, the proposed scheme reduces the bit error rate of multi-user detection by nearly an order of magnitude under high signal to noise ratio conditions, and the overload rate increases by about three times under the condition of bit error rate being 0.1, which demonstrate excellent random multiple access performance.

Key words: massive machine type communication, grant-free non-orthogonal multiple access, subframe-combined spread spectrum, compressed sensing based multi-user detection

CLC Number:

TN 929.5

Jing ZHANG, Xiang CHEN, Shuoyu WU, Longming YU. Subframe-combined spread spectrum and compressed sensing based massive grant-free multiple access scheme[J]. Systems Engineering and Electronics, 2025, 47(11): 3851-3858.

Figures/Tables 8

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References 30

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算法名	计算复杂度
SCS-SSP	iter·O（2K_a³G+4K_a²NG+3K_aNJ+KNJ）
SSP	iter·O（2K_a³+4K_a²N+3K_aNJ+KNJ）
SP	iter·O（2K_a³J+4K_a²NJ+3K_aNJ+KNJ）
SOMP	K_a·O（s³+2s²N+2sNJ+KNJ）
OMP	K_a·O（s³J+2s²NJ+2sNJ+KNJ）

参数名称	参数值
扩频因子N	100
总用户数K /个	1500
活跃用户数目K_a /个	60
SNR/dB	10
数据帧时隙数J	6
子帧数目G	2，3，6
调制方式	正交相移键控

Subframe-combined spread spectrum and compressed sensing based massive grant-free multiple access scheme

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