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We evaluate a scheme of single-relay network coding based on 4FSK (4 Frequency Shift Keying) modulation. Firstly, a loose upper bound BER (Bit Error Rate) of 4FSK is derived in the presence of frequency offset in the direct link. Secondly, 4FSK modulation is utilized in the three-slot two-way relay network and the BER of the transmission scheme is analysed and simulated in the case of the frequency offset. Index Terms - Network coding, BFSK, non-coherent demodulation, frequency offset.

The Effect of Frequency Offset on Network Coding with 4FSK Modulation