无线电工程

通过对二维超混沌映射IM进行过抽样的运算处理,得到了一种新的映射OIM,并由此生成了超混沌二值扩频序列OIMBS(Over-sampled Ikeda Map Binary Sequences),该一维序列在相关特性、平衡性及保密性等方面均优于IM二值序列IMBS(Ikeda Map Binary Sequences)。另外,根据一维扩频码的最优筛选策略优选出若干组Logistic Map二值序列、IMBS和OIMBS用于传统的DS-CDMA通信系统,在多种信道中仿真了系统的误码情况,结果证实了应用OIMBS的通信系统误码率要远低于采用其他2种序列的系统。

By over-sample operations on 2-D hyperchaotic map,IM,a novel map named OIM is proposed for the generation of OIMBS(Over-sampled Ikeda Map Binary Sequences).OIMBS are found possessing of better correlation property,balance property,and having higher security than IMBS(Ikeda Map Binary Sequences).Based on the optimal filter strategy for 1-D spreading sequences,Logistic Map binary sequences,IMBS and OIMBS are optimally selected for conventional DS-CDMA communication system respectively,and it is concluded that under a variety of channel conditions,the Bit Error Rate performances of the communication system which adopts OIMBS are anyway more desirable than those of other two systems.