College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China.
Chaos. 2013 Mar;23(1):013111. doi: 10.1063/1.4790831.
Chaotic communication has aroused general interests in recent years, but its communication effect is not ideal with the restriction of chaos synchronization. In this paper a new chaos M-ary digital modulation and demodulation method is proposed. By using region controllable characteristics of spatiotemporal chaos Hamilton map in phase plane and chaos unique characteristic, which is sensitive to initial value, zone mapping method is proposed. It establishes the map relationship between M-ary digital information and the region of Hamilton map phase plane, thus the M-ary information chaos modulation is realized. In addition, zone partition demodulation method is proposed based on the structure characteristic of Hamilton modulated information, which separates M-ary information from phase trajectory of chaotic Hamilton map, and the theory analysis of zone partition demodulator's boundary range is given. Finally, the communication system based on the two methods is constructed on the personal computer. The simulation shows that in high speed transmission communications and with no chaos synchronization circumstance, the proposed chaotic M-ary modulation and demodulation method has outperformed some conventional M-ary modulation methods, such as quadrature phase shift keying and M-ary pulse amplitude modulation in bit error rate. Besides, it has performance improvement in bandwidth efficiency, transmission efficiency and anti-noise performance, and the system complexity is low and chaos signal is easy to generate.
混沌通信近年来引起了广泛关注，但由于混沌同步的限制，其通信效果并不理想。本文提出了一种新的混沌 M 进制数字调制解调方法。利用时空混沌 Hamilton 映射在相平面上的区域可控特性和混沌对初始值的敏感性，提出了区域映射方法。它建立了 M 进制数字信息与 Hamilton 映射相平面区域之间的映射关系，从而实现了 M 进制信息的混沌调制。此外，基于 Hamilton 调制信息的结构特性，提出了区域划分解调方法，从混沌 Hamilton 映射的相轨迹中分离出 M 进制信息，并给出了区域划分解调器边界范围的理论分析。最后，在个人计算机上构建了基于这两种方法的通信系统。仿真结果表明，在高速传输通信且无混沌同步的情况下，所提出的混沌 M 进制调制解调方法在误码率方面优于一些传统的 M 进制调制方法，如正交相移键控和 M 进制脉冲幅度调制。此外，它在带宽效率、传输效率和抗噪声性能方面都有性能提升，且系统复杂度低，混沌信号易于产生。
