Auction‐based power allocation for downlink non‐orthogonal multiple access systems

Abstract

Non-orthogonal multiple access (NOMA) has been considered as one of the key enabling techniques for next-generation wireless networks and the overall performance of these systems largely depends on the power allocation (PA). In this Letter, the authors address the PA problem in a downlink cellular NOMA network. They propose an auction-based mechanism in which the users compete for the transmit power being sold by the base station. Each user places his bid iteratively in order to maximise his own utility. Further, the authors prove the existence of an unique Nash equilibrium theoretically. Simulation results demonstrate the effectiveness of the proposed scheme in terms of the average sum rate of users as compared to an existing algorithm.

Power allocation for downlink multiuser hybrid NOMA‐OMA systems: An auction game approach

“…The comparison of the proposed PA scheme with the existing algorithms in Wang et al and Lamba et al is shown in Figure for M = 3 and Figure for M = 4. It is quite evident that the proposed PA scheme demonstrates superior performance in terms of the average sum rate of the users for different values of P tot / σ 2 in comparison with the existing algorithms.…”

“…Furthermore, we prove the convergence of the game to a unique Nash equilibrium (NE) theoretically. The proposed auction game yields better results in terms of the average sum rate of users as compared with the existing algorithms in Wang and Lamba et al…”

“…If the algorithm reaches the optimum, ie, convergence, after N iterations, the overall time complexity of the PA algorithm becomes O ( MN ). However, the complexity of the algorithm in Wang et al in the worst case is O ( L ), whereas the complexity of the algorithm in Lamba et al is O ( LN ), where L is the total number of users. Hence, the complexity of the proposed PA scheme is more than that of the algorithm in but equivalent to that of in Lamba et al…”

“…In Li et al and Wang, the authors proposed PA schemes based on Stackelberg game in cellular NOMA networks. In Lamba et al, the authors employed auction theory to address PA problem in downlink cellular NOMA networks where all the users were served simultaneously. However, it makes the technique practically infeasible as the user with the best channel conditions will have to decode the rest 99 users' signal for a 100‐user NOMA system .…”

Clustering and Auction-Based Power Allocation Algorithm for Energy Efficiency Maximization in Multi-Cell Multi-Carrier NOMA Networks

“…The authors of Reference [12], introduced an auction-based resource allocation for software-defined networks. The auction-based power allocation game between users in NOMA network was addressed by Lamba et al [13]. The base station (BS) played the auctioneer while users are the bidders.…”