Abstract
This paper proposes a new two-way half-duplex cooperative communication system based on a new chaotic modulation scheme called Joint Grouping Subcarrier-Permutation Index Modulation-based Differential Chaos Shift Keying (GSPIM-DCSK) in order to enhance its energy efficiency, data rate, and BER-performance. GSPIM-DCSKI utilizes a permutation index to load additional data bits, and the input bits are divided into groups that contain carrier, permutation, and modulated bits. The active and within each group are selected based on carrier index bits. The energy and spectral efficiency of the GSPIM-DCSKI systems are evaluated and compared to GSIM-DCSKI. The performance of the new schemes is evaluated by calculating the bit error rate (BER) under different channel conditions. Finally, the BER performance of the new cooperative system using GSPIM-DCSKI is compared to a traditional cooperative system using DCSK and proves that the new cooperative system has a better performance than the traditional one in different channels. Simulation results show that at the multipath Rayleigh fading channel the proposed cooperative system gained SNR about 3 dB at a BER level of 10^(-3) at than the traditional one and this gain is increased to equal 4 Db when p2=4.
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