Abstract
Abstract Non-orthogonal multiple access (NOMA) and multiple-input multiple-output (MIMO) technologies are considered to be an integral part of 5G systems. These technologies can provide larger spectral efficiency without adding additional system bandwidth by power domain reuse. It meets the growing demand for higher connectivity and data rates for emerging wireless applications. However, in the MIMO-NOMA system, multiple user informations are non-orthogonal superposition transmission, which causes a strong inter-user interference and damages the achievable sum rate of the whole network. In this paper, we proposed power allocation methods for the multi-user MIMO-NOMA system to improve the achievable sum rate of the network. Specifically, we first divided users into strong user groups and weak user groups, then pairing two users according to channel correlation and channel gain difference. After grouping, the inter-group interference is eliminated thorough zero-forcing beam-forming (ZFBF). In order to further reduce intra-group interference and increase the sum rate of the system, we propose an intra-group power allocation method in which the allocated power is proportional to the distance from the user to the base station. This method can obtain a closed solution, so it has low complexity. It can improve the achievable sum rate. Simulations show the distance-based power allocation algorithm can further improve total capacity for MIMO-NOMA systems.
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