A New Multiple Access Technique for 5G: Power Domain Sparse Code Multiple Access (PSMA)

Moltafet, Mohammad; Mokari, Nader; Javan, Mohammad Reza; Saeedi, Hamid; Pishro-Nik, Hossein

doi:10.1109/access.2017.2775338

Cited by 66 publications

(51 citation statements)

References 23 publications

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“…In NOMA, the signals of different users can be simultaneously transmitted on the same resource element (RE) . Different NOMA techniques are studied, such as sparse code multiple access (SCMA), multiuser sharing access (MUSA), interleave division multiple access (IDMA), power domain sparse code multiple access (PSMA), and power domain multiple access (PD‐NOMA). In PD‐NOMA, by applying superposition coding, each subcarrier can be assigned to more than one user, and in the receiver side, by using successive interference cancellation (SIC), the signals of different users are obtained .…”

Section: Introductionmentioning

confidence: 99%

Energy efficient transmission in dynamic PDMA‐based systems with RF energy harvesting

Hooshiary

Azmi

Mokari

2020

Trans Emerging Tel Tech

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Nonorthogonal multiple access (NOMA) and energy harvesting technologies are two promising approaches to increase spectral and energy efficiency, respectively. In this paper, a pattern division multiple access (PDMA) uplink transmission network in which users are able to harvest energy from the received radio frequency power is considered. In order to maximize the energy efficiency, we perform resource allocation in the power, subcarrier, and time domains. Also, for each time slot, the pattern matrix is determined dynamically. To enhance the detection reliability, successive interference cancellation and maximal ratio combining at each receiver are utilized. For resource allocation, the actual harvested and available energies of the users are considered. Moreover, in order to perform a comprehensive analysis, further to PDMA, the energy efficiency of the power domain NOMA (PD-NOMA) is also investigated and the results are compared. It is shown that the energy efficiency and the average total transferred data of PDMA are higher than that of PD-NOMA.

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Section: Introductionmentioning

confidence: 99%

Energy efficient transmission in dynamic PDMA‐based systems with RF energy harvesting

Hooshiary

Azmi

Mokari

2020

Trans Emerging Tel Tech

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“…Recently, power domain sparse code multiple access (PSMA) [5] has been proposed as a hybrid of PD-NOMA and CD-NOMA. An extensive performance comparison of NOMA methods in a single cell system is found in [6], while the comparison between PD-NOMA and CD-NOMA in heterogeneous network is presented in [5] In CD-NOMA, the transmitter introduces redundancy to the transmitted symbol, via code and/or spreading, to enable receivers to perform MUD and separate signals from different users. Furthermore, CD-NOMA has additional advantages in comparison to PD-NOMA [7], such as the coding gain and the shaping gain (i.e., methods using multidimensional constellations) [8].…”

Section: Introductionmentioning

confidence: 99%

Fairness and Sum-Rate Maximization via Joint Subcarrier and Power Allocation in Uplink SCMA Transmission

Evangelista

Sattar

Kaddoum

et al. 2019

IEEE Trans. Wireless Commun.

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In this work, we consider a sparse code multiple access uplink system, where J users simultaneously transmit data over K subcarriers, such that J > K, with a constraint on the power transmitted by each user. To jointly optimize the subcarrier assignment and the transmitted power per subcarrier, two new iterative algorithms are proposed, the first one aims to maximize the sum-rate (Max-SR) of the network, while the second aims to maximize the fairness (Max-Min). In both cases, the optimization problem is of the mixed-integer nonlinear programming (MINLP) type, with non-convex objective functions, which are generally not tractable. We prove that both joint allocation problems are NP-hard. To address these issues, we employ a variant of the block successive upper-bound minimization (BSUM) [1] framework, obtaining polynomial-time approximation algorithms to the original problem. Moreover, we evaluate the algorithms' robustness against outdated channel state information (CSI), present an analysis of the convergence of the algorithms, and a comparison of the sum-rate and Jain's fairness index of the novel algorithms with three other algorithms proposed in the literature. The Max-SR algorithm outperforms the others in the sum-rate sense, while the Max-Min outperforms them in the fairness sense.

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“…Bit‐level interleaving and symbol level grid mapping process are carried out for each user to provide very good block error rate (BLER) performance and to provide user multiplexing capability . A scrambling‐cum‐coding–based power domain sparse code multiple‐access (PSMA) scheme is introduced in Moltafet et al In this scheme, multiple users share the same sparse code book and they are differentiated by assigning different power level to each user.…”

Section: Introductionmentioning

confidence: 99%

Power domain cyclic spread multiple access: An interference‐resistant mixed NOMA strategy

Shalini¹,

Stuwart²

2019

Int J Communication

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Summary The next generation wireless access technology highly relies on nonorthogonal multiple access (NOMA) technique. This paper proposes a novel power domain cyclic spread multiple access (PDCSMA) scheme for the design of NOMA system with power domain superposition coding (SC) and cyclic spreading at the transmitter concurrent with symbol level successive interference cancellation (SL‐SIC) at the receiver. Based on acceptable difference in channel gain, the users are grouped together to form PDCSMA clusters, and the unique power is allotted to each user in a cluster. The user with good channel condition is allotted less power, and the user with poor channel condition is allotted more power. Each PDCSMA cluster has its own spreading code, and the data of every user in a cluster are cyclic spread with the same code. Each cluster supports the number of multipath components equivalent to the length of the spreading code. The use of cyclic spreading makes the signal suffered by multipath fading less prone to intra cluster interference. The user signal is decoded by minimum mean square error‐frequency domain equalization (MMSE‐FDE) or maximal ratio combining (MRC)–based receiver in which weak user is detected with hard decision, and strong user is detected with SIC. Compared with conventional power domain NOMA (PDNOMA) and interleaved NOMA, the proposed PDCSMA achieves better bit error rate (BER) performance and assures guaranteed detection.

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A New Multiple Access Technique for 5G: Power Domain Sparse Code Multiple Access (PSMA)

Cited by 66 publications

References 23 publications

Energy efficient transmission in dynamic PDMA‐based systems with RF energy harvesting

Energy efficient transmission in dynamic PDMA‐based systems with RF energy harvesting

Fairness and Sum-Rate Maximization via Joint Subcarrier and Power Allocation in Uplink SCMA Transmission

Power domain cyclic spread multiple access: An interference‐resistant mixed NOMA strategy

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