摘要
为解决置换索引的差分混沌移位键控(PI-DCSK)通信系统存在能量效率低的问题,结合短参考技术,提出了一种M进制短参考置换索引的差分混沌移位键控(SR-PI-DCSK)系统.该系统将参考时隙的混沌序列缩短至小于半个符号周期,信息时隙将参考时隙的置换排列副本进行复制并拼接P次,在不增加PI-DCSK系统结构复杂度及维持相同的恢复比特信息所需能量的情况下,可以有效提高系统能量效率,同时提升系统的误比特率(BER).然后,分析了 SR-PI-DCSK 系统的能量效率,推导了其在多径瑞利衰落信道环境下的BER表达式,使用蒙特-卡罗模拟仿真验证了该理论推导的正确性.仿真结果表明,在同一条件下,所提出的系统与PI-DCSK系统相比具有更好的性能增益,这能为下一代物联网短距离通信应用提供一种混沌调制方案.
Abstract
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.
基金项目
宁德师范学院中青年科研项目(2022ZQ103)
福建省中青年教师教育科研项目(JAT220388)
NETL
NSTL
万方数据