改进型正交多载波降噪差分混沌键控通信系统

Improved quadrature multicarrier noise reduction differential chaos shift keying communication system

传统的多载波差分混沌移位键控系统存在误码性能差、传输速率和能量效率低的缺点,由此结合开关函数、希尔伯特变换技术和正交调制技术,研究了一种改进型正交多载波降噪差分混沌移位键控通信系统。在发送端,通过使用开关函数实现参考信号由奇数帧到偶数帧的复制,并引入正交调制技术和希尔伯特变换技术用于提升系统的传输速率。在接收端,通过引入滑动平均滤波器对接收信号进行降噪处理,以改善系统的误码性能。推导了该系统在加性高斯白噪声信道和多径瑞利衰落信道下的比特误码率公式并进行了仿真。仿真结果表明,相比于多载波差分混沌移位键控系统,该系统能有效提升误码性能、传输速率和能量效率。

The drawbacks of the traditional multicarrier differential chaos shift keying system are relating to poor bit error performance,low transmission rate and low energy efficiency.Thus,an improved quadrature multicarrier noise reduction differential chaos shift keying system,combining with switches,Hilbert transformation technology and quadrature modulation technology is proposed.At the transmitter,reference signal is duplicated from odd frame to a consecutive even frame by using switches,and quadrature modulation and Hilbert transformation technology are further introduced to improve the transmission rate.At the receiver,the moving average filter is introduced to average the received signals to improve the bit error performance of the system.The bit error rate formula of IQMC-NR-DCSK system under additive white Gaussian noise channel and multi-path Rayleigh fading channel are derived respectively,and the numerical simulations are also carried out.The results show that IQMC-NR-DCSK system can effectively enhance the bit error performance,transmission rate and energy efficiency,when comparing with the multicarrier differential chaos shift keying system.