Abstract
The Physical-layer Network Coding(PNC) is difficult to be wiretapped.In order to wiretap and recover the signals from the PNC system,a blind signal processing algorithm based on decoding was proposed to recover the information sequences from the senders in the paper.Firstly,the algorithm analyzed the mapping signal from the second slot in PNC scheme in order to get the parameters of modulation and encoding.Secondly,the algorithm processed the mixed signal from the first slot in the PNC scheme,and clustered the sampling data to judge the component of bit information.At last,the paper used the decoding algorithm to correct the information and took the mixed signal apart successfully.Extensive simulation studies show that the new algorithm based on constellation analysis and decoding can recover the signals blindly,and the Bit Error Rate(BER) reaches 10-3 when the Signal-to-Noise Ratio(SNR) is 11 dB.
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