IIIT Hyderabad Publications |
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Sum-Rate Maximization in Non-Orthogonal Multiple Access Relay NetworksAuthors: Zakir Hussain Shaik,Ubaidulla P Conference: 2018 IEEE 87th Vehicular Technology Conference Date: 2018-06-03 Report no: IIIT/TR/2018/35 AbstractNon-orthogonal multiple access (NOMA) has been conceived to be promising technology for the fifth generation (5G) wireless communication systems. In this paper, we investigate the downlink sum rate maximization problem in a relay based network which employs NOMA principles for encoding and decoding. The problem to be optimized is non-convex. In order to get around the difficulty to deal with non-convexity, we propose a minorization-maximization technique based algorithm to jointly optimize source power allocation and relay precoder design. We then solve the problem to optimally allocate power at source and design the precoder at relay. For the case of two destination nodes, we propose a grid search based approach. Simulation results are provided to illustrate the performance of the proposed algorithm and also the comparison of the proposed approach with existing approaches. Full paper: pdf Centre for Communications |
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