一种新的 CD-DCSK保密通信系统

摘要

For existing defects of low data transmission rate in the Differential Chaos Shift Keying (DCSK) and the high Bit Error Rate (BER) in Correlation Delay Shift Keying (CDSK), a novel CD-DCSK secure communica-tion system is proposed .The advantages of DCSK and CDSK are well combined in this scheme .Meanwhile the Sign function is introduced and then the constancy of bit energy is gained .The data transmission rate of this system is twice that of CDSK .In the receiving end , correlation demodulation technique is employed in two parallel demodula-tion modules at the same time , and the information can be restored .In addition, the BER in Additive-White-Gaussian-Noise ( AWGN) of the proposed system is deduced and compared with the traditional DCSK and CDSK systems.Theoretical analysis and simulation results show that the BER performance of this system is always better than CDSK.Also, the theoretical simulation results are well in accordance with Monte Carlo simulation results , which proves the system has a greater potential value in practical applications .%针对差分混沌键控（ DCSK）传输速率低及相关延时移位键控（ CDSK）误码率高的问题，提出一种新的CD-DCSK保密通信系统。该系统结合了DCSK和CDSK的特点，同时引入了符号函数实现了混沌序列比特能量恒定，系统传输速率达到DCSK的两倍。接收端采用两路相关解调技术，可以恢复出数据信息。给出系统在加性高斯白噪声（ AWGN）信道下的误码率公式，并与传统的DCSK系统和CDSK系统进行比较。理论分析及仿真结果表明，系统误码性能优于CDSK。理论仿真（ theo-ry）和蒙特卡洛（ Monte Carlo）仿真相符合，系统具有较大潜在应用价值。