Abstract
Non-orthogonal multiple access (NOMA)-based diamond relaying (NDR) is an efficient approach for combining NOMA and relaying techniques in such a way as to enhance the achievable rate from the source to the destination in the network. This paper examines the problem of joint power allocation among all the transmission phases during the operation of such networks. Based on the Karush-Kuhn-Tucker (KKT) condition and the second-order sufficient condition (SOSC), at least the local optimal solution is derived and analyzed. In addition, a new protocol for NDR networks based on cooperative communications is introduced and the associated joint power-allocation problem is examined. It is shown that this cooperative NDR (C-NDR) network further improves the achievable rate in some typical placements of the relays. Simulation results verify the correctness of the deviation and confirm the effectiveness of the proposed joint power-allocation method for both NDR and C-NDR networks.
Highlights
N ON-ORTHOGONAL multiple access (NOMA) and relaying are both effective techniques for improving the performance of future wireless communication networks
SIMULATION RESULTS This section conducts simulations to verify the correctness of the derivations presented above and to confirm the effectiveness of the proposed joint power-allocation methods for the NOMA-based diamond relaying (NDR) and cooperative NDR (C-NDR) networks
The performance of the proposed joint power-allocation method is first compared to that of the three approaches considered in [35], namely “I-CSI”: a power-allocation method based on instantaneous channel state information (CSI); “S-CSI”: a power-allocation method based on statistical CSI; and “sub. S-CSI”: a suboptimal power-allocation method based on S-CSI
Summary
N ON-ORTHOGONAL multiple access (NOMA) and relaying are both effective techniques for improving the performance of future wireless communication networks. The proposed joint power allocation further improves the achievable rate of NDR in some typical relayplacement scenarios, e.g., both NOMA-functioned relays are closer to the destination than to the source.
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