Optimal Energy-Efficient Power Allocation Scheme with Low Complexity for Distributed Antenna System

H. Wang, X. Yu, W. Xu, B. Wen

Optimal Energy-Efficient Power Allocation Scheme with Low Complexity for Distributed Antenna System

Číslo: 1/2017
Periodikum: Radioengineering Journal
DOI: 10.13164/re.2017.0353

Klíčová slova: Energy efficiency, distributed antenna system, power allocation, low complexity, Rayleigh channel, Energetická účinnost, distribuovaný anténní systém, alokace výkonu, nízká složitost, Rayleigh kanál.

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Anotace: In this paper, by maximizing the energy efficiency (EE), an optimal power allocation scheme is developed for downlink distributed antenna system (DAS). Different from conventional optimal power allocation schemes that need iterative calculation, the developed scheme can provide closed-form power allocation and no iteration is required. Based on the definition of EE, the optimized objective function is firstly formulated, and then a computationally efficient algorithm is proposed to obtain the optimal number of active remote antennas and the corresponding power allocation. Using the optimal number, the multidimensional solution for the optimized function is transformed into searching one-dimensional solution. As a result, closed-form expression of power allocation coefficients is attained. Numerical results verify the effectiveness of the proposed scheme. The scheme can obtain the same EE as the conventional optimal scheme but with lower complexity, and it has more accuracy than the existing low-complexity scheme.