Impact of nodes-mobility and imperfect channel estimation on two-way relay systems

Abstract

This thesis presents the performance analysis of a two-way relay system with nodes-mobility (NM) and channel estimation error (CEE) under time-varying Rayleigh fading. Herein, all nodes are equipped with the single-antenna devices and analog network coding (ANC) protocol is employed at the relay node. Moreover, we utilize first-order Markovian model to characterize NM in the channel. Along with NM, we also consider that CEE may exist in the practical scenario, where nodes require to estimate the channel state information (CSI). By incorporating these impairments, we derive the instantaneous end-to-end signal-to-noise ratios (SNRs) at two source nodes. Further, we obtain exact closed-form expressions for distribution and density functions of the e2e SNR. After that, we derived the accurate expressions of various performance metrics, i.e., sum-bit error rate (SBER), outage probability (OP), and ergodic sum-rate (ESR). Furthermore, to attain more insights into the considered system, we investigate the asymptotic behavior of the performance metrics. Finally, numerical and Monte-Carlo simulation results validate our theoretical analysis and illustrate the critical impact of NM and CEE on the performance degradation of considered system.