A Novel Low Density Superposition Modulation Scheme for Uplink NOMA

doi:10.13190/j.jbupt.2017-215

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2018, Vol. 41 ›› Issue (3): 14-19.doi: 10.13190/j.jbupt.2017-215

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A Novel Low Density Superposition Modulation Scheme for Uplink NOMA

JIANG Cheng-xin, WU Zhan-ji

School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China

Received:2017-11-01 Online:2018-06-28 Published:2018-06-04

Abstract

Abstract: There may exist short cycles if the matrix dimensions of sparse code multiple access (SCMA) are small, and the regular mapping matrix of SCMA doesn't take near-far effect into consideration. Therefore, a novel uplink non-orthogonal multiple access scheme named low density superposition modulation (LDSM) scheme is proposed to construct a sparser and irregular mapping matrix. The proposed scheme can improve the overall performance and the edge users' performance for it can get diversity gain and coding gain. The analysis of the average mutual information demonstrates LDSM can get signal to noise ratio (SNR) gains over SCMA in theory. Simulation results show that when power difference is 10 dB and overloading is 150%, small dimensional and large dimensional LDSM can get 2.3 dB and 2.46 dB SNR gains over SCMA for overall performance. Both theoretic analysis and simulation results prove the performance of LDSM outperforms that of SCMA.

Key words: non-orthogonal multiple access, low density superposition modulation, average mutual information, near-far effect, irregular

CLC Number:

TN929.53

JIANG Cheng-xin, WU Zhan-ji. A Novel Low Density Superposition Modulation Scheme for Uplink NOMA[J]. JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM, 2018, 41(3): 14-19.

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A Novel Low Density Superposition Modulation Scheme for Uplink NOMA

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