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 senarios. This paper presents a channel and delay estimation algorithm along with a detection scheme for Two-Way-Relay-Network (TWRN) in Rayleigh block- flat-fading channels. Prefix and suffix training sequences are added for frame-based synchronization and channel estimation. The Cramer-Rao Bound (CRB) is given, and simulations show that the mean square error(MSE) of channel estimation of the proposed scheme could reach the CRB. The end-to-end BER performance is also shown in simulation.
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