Differential Chaos Shift Keying System with M-ary Short Reference Permutation Index
To solve the problem of the low energy efficiency of permutation index differential chaos shift keying(PI-DCSK)communication systems that employ short-reference technology,we developed an M-ary short-reference PI-DCSK(SR-PI-DCSK)system.We shortened the chaotic sequence of the reference time slot to less than half of a symbol period and confirmed that the information time slot copied and spliced the permutation arrangement of the reference time slot P times.We analyzed the energy efficiency of the SR-PI-DCSK system and derived its BER expression in a multipath Rayleigh fading channel.Further,we verified the accuracy of the theoretical derivation using Monte Carlo simulations.The simulation results indicate that compared with the PI-DCSK system,the proposed system has a better performance gain under the same conditions,thus providing a candidate chaotic modulation scheme for the next generation of short-range communication applications in the Internet of Things(IOT).Moreover,the system can effectively improve the energy efficiency and bit error rate(BER)of the PI-DCSK system without increasing its structural complexity while requiring the same energy to recover the bit information.
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