To solve the problem of noise amplification of the physical layer network coding (PNC) by soft‑message‑forward (SMF) in the fifth‑generation cooperative communication
this paper proposes a PNC with selective soft‑message‑forward (SSMF) and a decoding scheme based on threshold decision. According to the principle that the superposition signal with minimum noise after zero forcing detection has the highest reliability
selecting the most reliable signal from the received signal set at the relay node and mapping this signal into log‑likelihood ratio metrics can improve the bit error ratio (BER) performance and reduce the complexity. Simulation results indicate that the proposed SSMF cooperative coding performance is relatively better under quasi‑static Rayleigh fading channel and binary‑phase‑shift keying (BPSK) modulation. At BER of 10
-3
the proposed cooperative coding scheme can obtain about 0.7dB
1.1 dB and 2.3dB gains when compared with those of the denoise‑and‑forward based adaptive diversity scheme
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