Abstract
We propose an agile-beam non-orthogonal multiple access (NOMA) scheme for millimeter wave (mmWave) communication networks. The agile-beam NOMA scheme can flexibly switch between the single/multi-beam NOMA transmission depending on the angular phase difference. In particular, we derive the asymptotic switching point with equal power and antennas resource allocation in a large number of BS antennas, which enables base station (BS) to make preliminary selection on beam mode. Furthermore, the optimization problem of maximizing the achievable sum rate in the agile-beam NOMA scheme is formulated and then decomposed into two subproblems, i.e., maximizing the sum rate in single-beam case and multi-beam case. And the optimal solution of power and antennas allocation is provided. Moreover, the proposed agile-beam NOMA scheme is extended to more general multi-user case. Simulation results verify the effectiveness of the asymptotic switching point compared with exact switching point. With the sum rate obtained by intelligent optimization algorithm as a benchmark, the optimal solution is validated in simulation. In addition, the sum rate with optimal resource allocation achieves significant gain over equal resource allocation.
Highlights
In order to meet the explosively increasing traffic demand, millimeter wave communication and non-orthogonal multiple access (NOMA) have been considered as two promising enabling technologies in 5G and beyond wireless networks [1]–[3]
The asymptotic switching point between single/multibeam case is derived in large number of antennas regime with equal power and antenna resource allocation
Based on phase difference of paired users |ψ12| and asymptotic switching point, the problem of maximizing the achievable sum rate in agile-beam NOMA scheme is decomposed into optimizing power and antenna resource allocation in single/multi-beam case
Summary
In order to meet the explosively increasing traffic demand, millimeter wave (mmWave) communication and non-orthogonal multiple access (NOMA) have been considered as two promising enabling technologies in 5G and beyond wireless networks [1]–[3]. A joint user pairing, antenna and power allocation algorithm for sum rate maximization in multi-beam NOMA networks is designed based on coalition formation game theory [12]. A joint power and antenna resource allocation scheme is proposed to maximize the sum rate of agile-beam mmWave NOMA networks. Given the switching point and phase difference of paired users, the optimization problem of maximizing sum rate of the proposed scheme is decomposed into the single-beam case and the. SYSTEM MODEL Without loss of generality, we consider a downlink transmission scenario in an agile-beam mmWave NOMA network as shown, where a BS switches between the VOLUME 7, 2019 single-beam and multi-beam transmission flexibly with a RF chain to serve two paired users Ui (i = 1, 2). Where wm ∈ CM×1 indicates that M antenna elements are always active in multi-beam NOMA transmission
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