OPTIMIZING POWER ALLOCATION ALGORITHM FOR DOWNLINK COUPLINING USERS IN NOMA NETWORKS

Nguyen Van Vinh; Trinh Thi Nhung

Nguyen Van Vinh Hung Yen University of Technology and Education
Trinh Thi Nhung Hung Yen University of Technology and Education

Abstract

In this paper, we consider the combination of non-orthogonal multiple access (NOMA) and ratesplitting (RS) in multi-antenna scenario. Specifically, a common signal is generated at the base station (BS) and transmitted with the user’s private signal. By using successive interference cancellation (SIC), the common signal is decoded and removed at each user, and then the private signal can be decoded based on the NOMA scheme. By jointly allocating power and pairing users, a weighted total rate maximization problem is formulated with quality of service (QoS) constraints, in which the priority of different signals is expressed. To solve this problem, a pairing based algorithm is analyzed and proposed. The simulation results show that: 1) the proposed RS-NOMA system outperforms the RS and NOMA systems; 2) the power allocation scenario and user pairing algorithm can improve the RS-NOMA system in terms of weighted sum ratio and outage probability.

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