2017/06/20 by Nader Mokari, Mohammad Reza Javan, Mokari, Nader +7
Computer Science · Engineering · #90C11 #Advanced MIMO Systems Optimization #Advanced Wireless Communication Technologies #FOS: Computer and information sciences #G.1.6 #Information Theory (cs.IT) #PAPR reduction in OFDM #Wireless Communication Networks Research
paper · pdf · doi:10.48550/arxiv.1706.06439
openalex publication_date 2017/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In this paper, a new approach for multiple access (MA) in fifth generation\n(5G) of cellular networks called power domain sparse code multiple access\n(PSMA) is proposed. In PSMA, we adopt both the power domain and the code domain\nto transmit multiple users' signals over a subcarrier simultaneously. In such a\nmodel, the same SCMA codebook can be used by multiple users where, for these\nusers, power domain non-orthogonal multiple access (PD-NOMA) technique is used\nto send signals non-orthogonally. Although different SCMA codebooks are\northogonal and produce no interference over each other, the same codebook used\nby multiple users produces interference over these users. We investigate the\nsignal model as well as the receiver and transmitter of the PSMA method. To\nevaluate the performance of PSMA, we consider a heterogeneous cellular network\n(HetNet). In this case our design objective is to maximize the system sum rate\nof the network subject to some system level and QoS constraints such as\ntransmit power constraints. We formulate the proposed resource allocation\nproblem as an optimization problem and solve it by successive convex\napproximation (SCA) techniques. Moreover, we compare PSMA with sparse code\nmultiple access (SCMA) and PD-NOMA from the performance and computational\ncomplexity perspective. Finally, the effectiveness of the proposed approach is\ninvestigated using numerical results. We show that by a reasonable increase in\ncomplexity, PSMA can improve the spectral efficiency about 50 % compared to\nSCMA and PD-NOMA.\n