一种新的跳时多址DCSK系统设计与分析
doi: 10.3724/SP.J.1146.2007.01649
A Novel Time-Hopping Multiple-Access DCSK System Designing and Analysis
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摘要: 常见差分混沌键控(DCSK)系统的多址方案存在两个问题，首先所有用户共享同一时隙，只能利用混沌信号的低互相关性来降低多址干扰。其次发送的参考信号和数据信号并不相同或相反，破坏了DCSK系统的良好抗多径性。该文提出了DCSK系统一种新颖的跳时多址方式。该方式给每个用户分配不同的伪随机跳时码，根据跳时码参考信号和数据信号进行相同量的跳时。从理论上给出了多址系统在加性高斯白噪声信道中的误码率解析式。分析和仿真表明该跳时多址方式可以很好地解决上述两个问题，而且具有更低的误码率。
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关键词:
- 混沌通信;差分混沌键控;跳时;多址干扰
Abstract: The common multiple-access schemes for Differential Chaos Shift Keying (DCSK) system have two disadvantages. Firstly, all users share the same slot, only method to decrease multiple-access interference is utilizing the low correlativity of chaotic signal. Secondly, the transmitted signals for reference and symbol are not same or reverse, so the strong anti-multipath character is destroyed. A novel time-hopping multiple-access scheme for DCSK system is put forward. It assigns different PN time-hopping codes to different users. The signals for reference and symbol in a frame have the same time-hopping value. In AWGN channel the systems bit error rate is obtained in theory. Analysis and simulation show that time-hopping multiple-access scheme can overcome above two disadvantages and has lower bit error rate. -
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