Performance of Regenerative Relay-Assisted D2D Communication in Mixed Fading Channels

Performance of device-to-device communication using selective decode-and-forward relaying is analyzed in mixed two-wave with diffuse power and Nakagami-m fading channels. A relay that successfully decodes the source information forwards it to the destination. The destination device combines the direct message signal from the source and its copy via the relay using maximal-ratio combining. Novel closed-form expressions for exact and asymptotic average bit error rates are derived. Furthermore, diversity order, the coding gain, and the optimal power allocation factor are obtained for better system insights. The analysis has been verified through Monte Carlo simulations.