Using chaotic signals in spread-spectrum communications has a few clear advantages over traditional approaches. Chaotic signals are nonperiodic, wideband, and more difficult to predict, reconstruct, and characterize than periodic carriers. These properties of chaotic signals make it more difficult to intercept and decode the information modulated upon them. However, many suggested chaos-based communication schemes do not provide processing gain, a feature highly desirable in spread-spectrum communication schemes. In this paper, we suggest two communication schemes that provide a processing gain. The performance of these and of the earlier proposed differential chaos shift keying is studied analytically and numerically for discrete time implementations. It is shown that, when performance is characterized by the dependence of bit error rate on E/sub b//N/sub 0/, the increase of the spreading sequence length beyond a certain point degrades the performance. For a given E/sub b//N/sub 0/, there is a length of the spreading sequence that minimizes the bit error rate.
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机译：与传统方法相比，在扩频通信中使用混沌信号具有一些明显的优势。混沌信号是非周期性的，宽带的，比周期性载波更难于预测，重构和表征。混沌信号的这些特性使得截取和解码调制在其上的信息变得更加困难。然而，许多建议的基于混沌的通信方案不提供处理增益，这是扩频通信方案中非常需要的特征。在本文中，我们建议两种提供处理增益的通信方案。这些和较早提出的差分混沌移位键控的性能是通过分析和数字方法研究的，用于离散时间实现。结果表明，当以比特误码率对E / sub b // N / sub 0 /的依赖性为特征时，扩展序列长度超过某一点的增加会降低性能。对于给定的E / sub b // N / sub 0 /，扩频序列的长度使误码率最小。
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