一种高速差分混沌移位键控系统

摘要

差分混沌键控(DCSK)系统的最大缺点是参考信号和数据信号消耗了相同比例的比特能量和数据传输速率.为了克服这一缺点,提出了一种高速差分混沌键控系统(HR-DCSK).该系统缩短了原来DCSK参考信号的长度,同时数据信号携带2 bit数据,并将数据信号重复发送,提高了数据传输速率和能量效率.推导出在高斯信道中的比特误码率公式并进行仿真,理论分析和仿真表明,在相同信噪比下,HR-DCSK比调频差分混沌键控系统(FM-DCSK)误码率降低了10％.%Data rate and energy decrement caused by the transmission of reference and data in equal portions constitute the major drawback of a differential chaos shift keying (DCSK) system.To overcome this dominant drawback,a high rate differential chaos shift keying(HR-DCSK) system is proposed.The system shortens the length of the reference chaotic signal of the conventional DCSK,2 bit data can be carried in data signal,and the data signal is repeaded to transform.This system improves data transfer rate as well as energy efficiency.The bit error rate (BER) over Gaussian channel is derived and numerous simulation is performed.Theoretical analysis and simulation results show that the BER of HR-DCSK is reduced by 10％ than that of FM-DCSK in the same signal-to-noise ratio(SNR).