Effect of residual of self-interference in performance of full-duplex D2D communication

This paper studies possibility of using full-duplex (FD) radios in underlay device-to-device communication (D2D) in cellular networks. We consider a cellular system with one D2D pair and one cellular user. Cellular user is sharing the radio resources with D2D link which is equipped with full-duplex radios. The problem of sum-power minimization of cellular system and D2D link both in uplink and downlink period is considered. Considering the interference caused because of exploiting the same radio resources, for uplink period, we use fixed point iterations to solve the optimization problem to calculate transmit powers of users. To design the optimal receiver in the base station, linear minimum mean squared error method is used. In the downlink, to calculate optimal transmit precoder at base station and optimal D2D transmit powers, the optimization problem is formulated as a second order cone problem (SOCP) and solved using CVX in Matlab. Since the available full-duplex radios are not able to cancel the self-interference completely, residual of self-interference is considered in D2D receivers. Performance of the full-duplex D2D with different amounts of self-interference cancelation is compared to that of half-duplex D2D. Results show that full-duplex radios with 110 dB self-interferece cancelation can provide double the throughput for D2D compared to half-duplex radios.