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传统的混沌扩频(CDSS)是利用混沌序列量化、编码后产生的0、1序列作为扩频码,来实现频谱展宽。另外,由于混沌序列本身的宽频特性,一些传统的混沌数字调制技术也可被用于扩频通信系统的设计。在单向耦合映像格子(OCML)时空混沌模型同步的基础上,直接利用混沌相位键控(CPSK)调制技术构建了一个多用户扩频通信系统。该模型为每个用户分配一个OCML时空混沌模型,为了更好地利用时空混沌系统的时间与空间混沌特性,其采用“跳格序列”作为扩频调制序列对用户信息进行调制。通过与传统混沌直接序列扩频(CDSS)系统的仿真比较发现,所设计的CPSK调制多用户扩频通信系统拥有比后者更好的误码性能及安全性能。
The traditional Chaos Spread Spectrum (CDSS) is the use of chaotic sequence quantization, encoding the resulting 0,1 sequence as the spreading code to achieve spectral broadening. In addition, due to the chaotic sequence itself, the broadband characteristics of some traditional chaotic digital modulation technology can also be used for the design of spread spectrum communication system. Based on the synchronization of spatiotemporal chaotic model of unidirectional coupled map lattice (OCML), a multi-user spread spectrum communication system is constructed using chaos phase-shift keying (CPSK) modulation technology. The model allocates a space-time chaos model of OCML to each user. In order to make better use of the time and space chaos characteristics of the spatiotemporal chaos system, the model uses the “tabular sequence” as the spread spectrum modulation sequence to modulate user information. Compared with the traditional Chaos Direct Sequence Spread Spectrum (CDSS) system simulation, it is found that the designed CPSK modulated multi-user spread spectrum communication system has better error performance and safety performance than the latter.