Suboptimal energy efficient power allocation scheme for distributed antenna system with antenna selection

A novel energy efficiency (EE) is introduced, which is defined as the ratio of the average transmission rate to the total consumed power. On the basis of this, a suboptimal energy efficient power allocation (PA) scheme is developed for the distributed antenna system with antenna selection over the composite fading channel. A Newton's method-based practical iterative algorithm is presented to find the solution of PA in this scheme. Compared with the conventional energy efficient PA scheme, which requires the instantaneous channel state information (CSI), the developed scheme only needs the statistic CSI, and thus it has good robustness and low overhead. Moreover, it can obtain an EE performance very close to that of the optimal scheme. Simulation results verify the effectiveness of the proposed scheme.