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Private communications with chaotic code division multiple access: Performance analysis and system design.

机译：具有混沌代码划分多路访问的专用通信：性能分析和系统设计。

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摘要

In this dissertation we develop a class of pseudochaotic direct-sequence code division multiple access (DS/CDMA) systems that can provide private and reliable communication over wireless channels. These systems exploit the sensitive dependence of chaotic sequences on initial conditions together with the presence of channel noise to provide a substantial gap between the bit error probabilities achievable by intended and unintended receivers. We illustrate how a desired level of private communication can be achieved with a systematic selection of the system parameters. This type of privacy can be readily combined with traditional encryption methods to further ensure the protection of information against eavesdroppers.; The systems we propose employ linear modulation of each user's symbol stream on a spreading sequence generated by iterating a distinct initial condition through a pseudochaotic map. We evaluate and compare the uncoded probability of error (Pr(epsilon)) achievable by intended receivers that know the initial condition used to generate the spreading sequence to the associated Pr(epsilon) of unintended receivers that know the modulation scheme but not the initial condition. We identify the map attributes that affect privacy, and construct algorithmic design methods for generating pseudochaotic spreading sequences that successively and substantially degrade the unintended user performance, while yielding intended user performance similar to that of conventional DS/CDMA systems. We develop efficient metrics for quantifying the unintended receiver Pr(epsilon) and prove that it decays at a constant rate of 1/ SNR in AWGN and fading channels. In addition, we show that this decaying rate is independent of the available degrees of diversity in fading channels, showing in the process that only intended receivers can harvest the available diversity benefits. Moreover, we illustrate that the pseudochaotic DS/CDMA systems can provide reliable multiuser communication that is inherently resilient to eavesdropping, even in the worst-case scenarios where all receivers in a network except the intended one collude to better eavesdrop on the targeted transmission. We also develop optimized digital implementation methods for generating practical pseudochaotic spreading sequences that preserve the privacy characteristics associated with the underlying chaotic spreading sequences.
机译：在本文中，我们开发了一类伪混沌直接序列码分多址（DS / CDMA）系统，该系统可以在无线信道上提供私有和可靠的通信。这些系统利用了混沌序列对初始条件的敏感依赖性以及信道噪声的存在，从而在有意和无意的接收器可实现的误码率之间提供了很大的差距。我们说明了如何通过系统选择系统参数来实现所需的专用通信级别。这种类型的隐私可以很容易地与传统的加密方法结合起来，以进一步确保信息免受窃听者的侵害。我们提出的系统在通过伪混沌映射迭代不同的初始条件而生成的扩展序列上，对每个用户符号流进行线性调制。我们评估并比较了知道用于生成扩展序列的初始条件的预期接收器可实现的未编码错误概率（Pr（epsilon））与已知的调制方案但不了解初始条件的非预期接收器的相关Pr（epsilon） 。我们确定了影响隐私的地图属性，并构建了算法设计方法来生成伪混沌扩展序列，该序列连续并实质上降低了意外的用户性能，同时产生了与常规DS / CDMA系统相似的预期用户性能。我们开发了用于量化意外接收器Pr（epsilon）的有效指标，并证明了它在AWGN和衰落信道中以1 / SNR的恒定速率衰减。此外，我们表明该衰减率与衰落信道中可用的分集程度无关，这表明在此过程中，只有目标接收机才能收获可用的分集收益。此外，我们说明了伪混沌DS / CDMA系统可以提供可靠的多用户通信，即使在最坏的情况下，网络中除预期接收方之外的所有接收器合在一起可以更好地对目标传输进行窃听，即使在最坏的情况下，伪随机DS / CDMA系统也可以提供固有的防窃听能力。我们还开发了优化的数字实现方法，用于生成实用的伪混沌扩展序列，该序列保留与基础混沌扩展序列相关的隐私特征。

著录项

  • 作者

    Hwang, Yeong-Sun.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 157 p.
  • 总页数 157
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;
  • 关键词

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