Abstract:In order to solve the problem of low energy efficiency of permutation index differential chaotic shift keying (PI-DCSK) communication system, combined with short reference technology, a M-ary short reference permutation index differential chaotic shift keying (SR-PI-DCSK) system is proposed. The chaotic sequence of the reference time slot is shortened to less than half a symbol period, and the information time slot copies the permutation arrangement of the reference time slot are copied and splicing P times. This system can effectively improve the energy efficiency and the bit error rate (BER) of the system without increasing the complexity of the PI-DCSK system and maintaining the same energy required to recover bit information. The energy efficiency of SR-PI-DCSK system is analyzed, and the BER expression of SR-PI-DCSK system in multi-path Rayleigh fading channel is derived. The correctness of the theoretical derivation is verified by Mont-Carlo simulation. The simulation results show that compared with the PI-DCSK system, the proposed system has better performance gain under the same conditions, which provides a candidate chaotic modulation scheme for the next generation of IOT short-range communication applications.
