摘要
差分混沌键控(differential chaos shift keying,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能量和数据传输速率。为了克服这一缺点,提出了一种高速降噪的差分混沌键控(high rate noise reduction differential chaos shift keying,HRNR-DCSK)系统。该系统将数据信号扩展为多个时隙,每个时隙传输不同的数据比特,并且参考时隙的长度随着传输比特数量的增加而缩短,最后在接收端通过降低接收信号噪声的方差来提高系统的误码率(bit error rate,BER)性能。该方式提高了数据传输速率,降低了比特能量。采用高斯近似法(Gaussian approximation,GA)推导出加性高斯白噪声(additive white Gaussian noise,AWGN)信道以及瑞利信道中的比特BER公式并进行仿真。理论分析和仿真表明:在两种信道中理论推导和仿真曲线有较好的吻合,同时HRNR-DCSK系统能有效改善系统的传输速率,在混沌通信领域具有一定的应用前景。
Data rate and energy decrement caused by the transmission of reference and data in equal portions constitute the major drawbacks of differential chaos shift keying（DCSK）system.To overcome this dominant drawback,a high rate noise reduction differential chaos shift keying（HRNR-DCSK）system is proposed.The system extends data signals into a plurality of slots,each slot to transmit different data bits,and the reference sequence length decreases with the increasing number of transmission bits.At the receiver,the variance of the noise of the received signal is reduced to improve the performance of bit-error-rate（BER）systems.This system improves the data transfer rate as well as energy efficiency.The BER over additive white Gaussian noise（AWGN）channel and Rayleigh channel is derived and numerous simulation is made.Theoretical analysis and simulation results show that simulations in both environments show a perfect match with the analytical expressions,meanwhile,HRNR-DCSK system can effectively improve data transfer rate and has certain application prospect in the chaotic communication field.
作者
张刚
郝怡曼
张天骐
ZHANG Gang;HAO Yiman;ZHANG Tianqi(Chongqing Key Laboratory of Signal and Information Processing,Chongqing University ofPosts and Telecommunications,Chongqing 400065,China)
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2018年第7期1588-1594,共7页
Systems Engineering and Electronics
基金
国家自然科学基金(61671095
61371164
61275099)
信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003)
重庆市教育委员会科研项目(KJ1600427
KJ1600429)资助课题
关键词
差分混沌键控
高速降噪差分混沌键控
高速率
降噪
differential chaos shift keying （DCSK）
high rate noise reduction differential chaos shift keying （HRNR-DCSK）
high rate
noise reduction
