Inter-symbol-interference cancelation in time-domain physical-layer network coding with fractional delay

Decode-and-forward physical-layer network coding (PLNC) is one of the promising high-performance techniques for wireless relay networks, but little has been reported on the case of asynchronous scenarios using practical pulse shaping waveforms. When signals arrive at the relay with symbol level fractional delay, inter-symbol interference (ISI) will occur. This paper presents an iteration-based ISI cancelation scheme for practical asynchronous two-way relay network (TWRN) with fractional delay. Signals from both terminals are separately decoded for ISI reconstruction and elimination. Simulations show that the proposed scheme with even just one iteration can significantly improve the BER performance.