Outage probability region and optimal power allocation for uplink SCMA systems

Chen, Jiaxuan, Wang, Zhaocheng, Xiang, Wei, and Chen, Sheng (2018) Outage probability region and optimal power allocation for uplink SCMA systems. IEEE Transactions on Communications, 66 (10). pp. 4965-4980.

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As a promising non-orthogonal multiple access scheme, sparse code multiple access (SCMA) technology has attracted much attention. Because inter-user interference is present in code domain and multi-user iterative detection is required, user capacity and outage probability analysis for uplink SCMA systems are challenging and have not been presented in the literature. In this paper, the capacity region for uplink SCMA systems is analyzed, based on which the common and individual outage probability regions are calculated. Optimizing the outage probability within the outage probability region can be casted as an Lagrangian duality problem and solved by an iterative descent algorithm, which however imposes high complexity since the expectation operation is required in each iteration. To reduce the computational complexity of solving this Lagrangian duality problem, an adaptive algorithm is developed, which is capable of providing the optimal outage probability and adaptively updating it. Furthermore, a power allocation policy is naturally obtained to achieve the optimized outage probability in the outage probability region.

Item ID: 56069
Item Type: Article (Research - C1)
ISSN: 1558-0857
Keywords: sparse code multiple access, capacity region, common outage probability region, individual outage probability region, power allocation policy
Copyright Information: © 2018 IEEE. Personal use is permitted, but republication/redistribution requires IEEE permission. See http://www.ieee.org/publications_standards/publications/rights/index.html for more information.
Date Deposited: 07 Nov 2018 09:32
FoR Codes: 40 ENGINEERING > 4006 Communications engineering > 400608 Wireless communication systems and technologies (incl. microwave and millimetrewave) @ 100%
SEO Codes: 89 INFORMATION AND COMMUNICATION SERVICES > 8901 Communication Networks and Services > 890103 Mobile Data Networks and Services @ 100%
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