Joint Power Allocation for Non-orthogonal Multiple Access in Wireless Backhaul Networks

Abstract

In this paper, we propose to adopt the Non-orthogonal Multiple Access (NOMA) technique to improve the spectrum efficiency for both the downlink and uplink transmissions in the wireless backhaul networks. We consider two decoding strategies and formulate the joint power allocation problem for both scenarios. Due to the coupling between the backhaul and access transmission stages, the transmission power should be carefully allocated in both stages so that the overall throughput can be maximized. We present the convex-concave procedure(CCP) to address the non-convex problem. Simulation results demonstrate that the proposed schemes are effective in improving the throughput and outperforms the conventional orthogonal multiple access(OMA) scheme under different network settings.