Power Minimization in Distributed Antenna Systems Using Non-Orthogonal Multiple Access and Mutual Successive Interference Cancellation

Abstract

This paper introduces new approaches for combining non-orthogonal multiple access with distributed antenna systems. The study targets a minimization of the total transmit power in each cell, under user rate and power multiplexing constraints. Several new suboptimal power allocation techniques are proposed. They are shown to yield very close performance to an optimal power allocation scheme. Also, a new approach based on mutual successive interference cancellation of paired users is proposed. Different techniques are designed for the joint allocation of subcarriers, antennas, and power, with a particular care given to maintain a moderate complexity. The coupling of non-orthogonal multiple access to distributed antenna systems is shown to greatly outperform any other combination of orthogonal/non-orthogonal multiple access schemes with distributed or centralized deployment scenarios.

New Power Minimization Techniques in Hybrid Distributed Antenna Systems With Orthogonal and Non-Orthogonal Multiple Access

“…To the best of our knowledge, the problem of downlink power minimization in DAS networks with RRH power limits using NOMA has not been addressed yet. This problem is substantially different from the one in [14] since heavily loaded antennas are generally the most important players in minimizing the system power. Thus, setting power limits on some of them will necessarily raise the system power consumption.…”

“…In our previous work [14], we showed that two users k 1 and k 2 power-multiplexed on a subcarrier n and transmitted by two different RRHs r 1 (n) and r 2 (n) respectively, can perform mutual SIC, i.e. perform SIC simultaneously, if their channel gains verify:…”

“…after applying OMA signaling at the first stage, instead of jointly assigning collocated users to subcarriers. In [14], we unveiled some of the potential of DAS systems combined with NOMA, in which we showed that under some specific subcarrier, users and powering antennas configurations, the two paired users on a subcarrier would be able to perform successive interference cancellation (SIC). Based on this property, we developed techniques for joint subcarrier and power allocation that aim at minimizing the total amount of power under user rate constraints in downlink NOMA.…”

Performance Evaluation of Massive MIMO With Beamforming and Nonorthogonal Multiple Access Based on Practical Channel Measurements

“…By a judicious power multiplexing, NOMA greatly outstrips the performance of its predecessor OMA (Orthogonal Multiple Access), widely used in 4G systems. It has also proved to be an important ally of multi-antenna transceivers in leveraging both energy and spectral efficiency of wireless systems, either in collocated [2] [3] or distributed antenna configurations [4]. Power-domain NOMA allows multiplexing two or several users on the same frequency subband by taking advantage of their channel gain difference [5].…”

Energy-efficient techniques for combating the influence of reactive jamming using Non-Orthogonal Multiple Access and Distributed Antenna Systems

“…PA is performed by maximizing EE under the constraints of total transmit power per RRH, target Bit Error Rate and proportional fairness among users. The problem of power minimization in DAS was considered in [4] with a joint allocation of subcarrier, RRH and power to users, so as to guarantee user target rates. However, none of these studies have accounted for the presence of a jammer in the system.…”