OFDM-CPFSK Modulated Physical-Layer Network Coding over Frequency Selective Fading Channels

In this paper, we aim to design an orthogonal frequency division multiplexing-continuous phase frequency shift keying (OFDM-CPFSK) modulated physical-layer network coding (PNC) scheme, i.e., PNC-OFDM-CPFSK, for a two-way relay network in frequency selective fading environments. Two classes of OFDM-CPFSK schemes are investigated, namely single- h and multi- h. The detection problem at the relay receiver is discussed and the end-to-end bit error rate (BER) performance of the PNC-OFDM-CPFSK system is carried out by simulation results. It is shown that PNC-OFDM-CPFSK can offer superior BER performance compared to PNC-OFDM-BPSK.