Error Performance of Physical-Layer Network Coding in Multiple-Antenna Two-Way Relay Systems With Outdated CSI

In this paper, we study the impact of outdated channel state information (CSI) on the error rate performance in multiple-antenna two-way decode-and-forward (DF) relay systems, where physical-layer network coding (PNC) is adopted. We consider two variations of relay selection, namely, single best relay selection (S-RS) and multiple successfully-participated relay selection (MSP-RS). Under perfect and outdated CSI assumptions, closed-form expressions for the end-to-end system symbol error probability (SEP) are derived for the S-RS scheme, along with the asymptotic SEP expressions in high SNR regions for the MSP-RS scheme. By both analytical and simulation results, it is clearly shown that a full cooperative diversity gain can be achieved with perfect CSI. The results also manifest that the S-RS scheme can achieve only the transmit diversity gain with outdated CSI. On the other hand, the MSP-RS scheme can achieve a full cooperative diversity gain even if the CSI is outdated at the expense of high complexity.National Science Foundation of China (NSFC) [61471008, 91338106, 61231011, 61231013]; Specialized Research Fund for the Doctoral Program of the Ministry of Education of China [20120001120125]; National Natural Science Foundation of Beijing [4144075]SCI(E)EIARTICLEl.bai@buaa.edu.cn103744-37536