Physical-layer network coding over wireless fading channel

This paper proposes a new combinational technology which is feasible to apply physical-layer network coding (PNC) to wireless fading channel. The key step of PNC is that sources broadcast signals simultaneously without orthogonal scheduling. Naturally, the signals overlap in the free space at the receivers. Since the signals from different sources are mutual independent, rooted on this rational assumption, an enhanced Joint Diagonalization Separation named Altering Row Diagonalization (ARD) algorithm is exploited to separate these signals by maximizing the cost function measuring independence among them. This APNC (ARD PNC) methodology provides an innovative apparatus to implement signal-level network coding at the presence of interference and without any priori information about channels in fading environments, thus a blind way. Besides throughput gains via fully utilization of channel degree of freedom, APNC diversity gains could be ensured by relaying selection. In conclusion, the proposed APNC performs well with higher bandwidth efficiency and lower error rate.