Abstract
We consider the beamforming design to maximize the energy-efficiency (EE) of a K link multiple-input multiple-output (MIMO) interference channel, where each link consists of two full-duplex (FD) nodes. We first transform the original fractional form optimization problem into an equivalent subtractive-form optimization problem by exploiting the properties of fractional programming, and then perform a two-layer optimization scheme. In the outer layer, the EE parameter is searched using a simple one-dimensional search, and in the inner layer, the relationship between Weighted-Sum-Rate (WSR) and Weighted Minimum-Mean-Squared-Error (WMMSE) problems is exploited to solve the subtractive form optimization problem. Simulation results show that the EE of FD systems is lower than that of half-duplex (HD) systems, as FD nodes need to overcome self-interference (SI) which leads to high power consumption.
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