Total Power Minimization: Joint Antenna Selection and Beamforming Design

TL;DR

This paper proposes a novel iterative method for total power minimization in antenna systems, optimizing joint antenna selection and beamforming to reduce power consumption while satisfying SINR constraints.

Contribution

It introduces a zero-norm based model for antenna selection and derives closed-form iterative solutions for narrowband and multi-band systems, improving power efficiency.

Findings

Significant power savings over standard methods.

Effective antenna selection reduces circuit power.

Closed-form solutions enable practical implementation.

Abstract

In this paper, we consider the total power minimization problem when we have signal-to-interference-plus-noise ratio (SINR) constraints. The consumed power in the circuits depends on the number of active antennas, which can be modeled using zero-norm. Due to the difficulty of dealing with the non-convex zero-norm, we used the standard alternate weighted one-norm approach. We addressed the total power minimization for a narrowband system with and without per-antenna power constraints (PAPCs). We derived iterative closed-form expressions in both cases. Then we analysed the case when we have multiple bands operating at the same time. Analogous closed-form expressions are provided. Our simulation results show that significant gains can be obtained in terms of the total power required compared to standard methods that do not take into account the circuit power.