A new user cooperative protocol based on code-shifted differential chaos shift keying modulation

In this paper, a new cooperative protocol based on code-shifted differential chaos shift keying (CS-DCSK) modulation, which is an improved differential chaos shifted keying modulation scheme no requirement delay circuits at autocorrelation receiver (AcR), is proposed. The relay user transmits own data while piggybacks other user´s data which are received and decoded at pre-phase utilizing the multiple bit-streams transmission property of generalized CS-DCSK (GCS-DCSK). Moreover, the cooperative user may forward the estimated data only when its data is correctly decoded using cyclic redundancy check (CRC) code, namely selective decode-and-forward (DAF). Simulation results show that the proposed protocol has better performance than that of conventional four phase cooperative protocol in bit error rate (BER) and system throughput.