Device-to-Device Communication Aided by Two-Way Relay Underlaying Cellular Network

In this paper, we investigate the performance of device-to-device (D2D) communication assisted by two-way detect and forward (DF) relaying. Here, we derive an accurate approximate expression for sum-rate of two-way relaying D2D link under varying interference from cellular users and base station (BS). The analytical results reveal that D2D communication using relaying strategy provides a better and reliable communication in terms of maximum achievable sum-rate as compared to cellular communication mode. The two-way relaying technique improves bit error probability (BEP) by mitigating interference in the first phase of two-way transmission. On the basis of instantaneous signal to noise ratio (SNR), the combiner at the destination node follows an adaptive weight update process to improve the BEP performance in the second phase. We also analyze heuristic mode selection and resource allocation strategies in cellular network in association with multi-node two-way relay scheme, which not only boosts the energy efficiency of the system but also extends the coverage of cellular network.