Performance of Multiple Antennas Selection in SIMO Systems with BPSK/QPSK Modulations

TL;DR

This paper analyzes the performance of SIMO systems with antenna selection and BPSK/QPSK modulations, deriving accurate expressions for mutual information and capacity, supported by simulations.

Contribution

It provides a novel closed-form approximation for the mutual information and capacity of SIMO systems with antenna selection under Rayleigh fading.

Findings

High-precision approximation of average mutual information

Insights into capacity and energy efficiency of SIMO systems

Validation of analytical results through simulations

Abstract

This paper studies the performance of single-input multiple-output (SIMO) systems under receive antenna selection (RAS) and BPSK/QPSK modulations. At the receiver, a subset of branches are selected and combined using maximal-ratio combining (MRC) to maximize the instantaneous Signal to Noise Ratio (SNR). By assuming independent and identical distributed (i.i.d.) Rayleigh flat fading, a closed-form expression, with considerably high precision, is developed to approximate the average input-output mutual information, also termed as symmetric capacity, of the whole system. Later, this approximated expression is further utilized to investigate the efficient capacity and energy efficiency of the SIMO system under BPSK/QPSK modulations and RAS. Besides analytical derivations, simulations are provided to demonstrate the approximation precision, feasibility and validity of the derived results.