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Spectral-Energy Efficiency Trade-off-based Beamforming Design for MISO Non-Orthogonal Multiple Access Systems

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Document pages: 14 pages

Abstract: Energy efficiency (EE) and spectral efficiency (SE) are two of the keyperformance metrics in future wireless networks, covering both design andoperational requirements. For previous conventional resource allocationtechniques, these two performance metrics have been considered in isolation,resulting in severe performance degradation in either of these metrics.Motivated by this problem, in this paper, we propose a novel beamforming designthat jointly considers the trade-off between the two performance metrics in amultiple-input single-output non-orthogonal multiple access system. Inparticular, we formulate a joint SE-EE based design as a multi-objectiveoptimization (MOO) problem to achieve a good tradeoff between the twoperformance metrics. However, this MOO problem is not mathematically tractableand, thus, it is difficult to determine a feasible solution due to theconflicting objectives, where both need to be simultaneously optimized. Toovercome this issue, we exploit a priori articulation scheme combined with theweighted sum approach. Using this, we reformulate the original MOO problem as aconventional single objective optimization (SOO) problem. In doing so, wedevelop an iterative algorithm to solve this non-convex SOO problem using thesequential convex approximation technique. Simulation results are provided todemonstrate the advantages and effectiveness of the proposed approach over theavailable beamforming designs.

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