Performance of dual-branch selection combining receiver over Fluctuating Two-Ray (FTR) fading channels for 5G mmWave communications

Abstract

The fluctuating two-ray (FTR) fading channels is a suitable model of small-scale fading environment for fifth-generation millimeter-wave and beyond communications. This paper evaluates the performance of selection combining (SC) of the received signals through an independent FTR fading channels. A dual-branch SC receiver is considered because of its lower complexity and significant improvement from the non-diversity system. The probability distribution function (PDF) expression of the received signal to noise ratio (SNR) of the SC receiver is obtained from the cumulative distribution function of SNR for FTR fading channels. The average bit error rate of coherent and non-coherent modulation schemes are derived using the obtained received PDF expression. The impacts of the fading parameters on the performance of the system are analyzed numerically. The numerically estimated expressions are verified with standard outcomes and Monte Carlo simulation.