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Transceiver design for ultra-wideband communication systems.

机译：超宽带通信系统的收发器设计。

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摘要

Ultra-Wideband (UWB) communication systems have great potentials in both military and commercial applications because of many of their attractive features: covertness, high data rate, fine delay resolution, minimal power consumption and low complexity. However, significant challenges exist, in UWB transceiver design and many research topics in this area remain open. There exist different types of UWB systems. Among them, we focus on impulse radio UWB in this dissertation. Accordingly, we address the issues in and propose solutions to efficient transmission; channel estimation, analog-to-digital conversion and receiver design.; When time hopping (TH) is coupled with impulse radio, multiuser communication is enabled. Noticing the unknown channel information for each user is embedded in statistics of received signals, we propose blind mean and covariance matching techniques to jointly estimate all users' channel parameters. The mean based approach has low complexity and is easy to implement while the covariance based approach can yield asymptotically minimum variance performance. By some modifications, they are extended to a TH-UWB system when hopping sequences vary across information symbols. Due to time varying codes, unique single-user solutions are derived in addition to multiuser counterparts.; To reduce the high price paid in statistical channel estimation, we propose a novel modulation diversity assisted UWB transmission scheme, where pulse position modulation and amplitude modulation are employed alternately on consecutive pulses. Signal models with and without inter-symbol interference are provided and the signal spectral characteristic is analyzed. Since consecutively received signals can be used as mutual references in detection, no explicit channel estimation is needed. Thus low complexity analog transceiver design is possible. If a block of received signals are processed, a high quality reference is obtained at a price of increased complexity. Adaptively updating the reference can yield performance close to a maximum likelihood channel estimator based detector.; Because a high sampling rate analog-to-digital converter (ADC) constitutes the major hurdle in UWB digital receivers, we analyze the effect of low resolution ADC on system performance in a transmitted-reference system with inter-pulse interference. Joint estimation and detection performance is analytically evaluated capturing the effects of ADC resolution, finite signal samples, and background noise.
机译：超宽带（UWB）通信系统具有许多吸引人的功能，它们在军事和商业应用中都具有巨大的潜力：隐蔽性，高数据速率，精细的延迟分辨率，最小的功耗和低复杂度。但是，在UWB收发器设计中仍然存在重大挑战，并且该领域的许多研究主题仍未解决。存在不同类型的UWB系统。其中，本文重点研究脉冲无线电UWB。因此，我们解决了其中的问题并提出了有效传输的解决方案；信道估计，模数转换和接收机设计。当跳时（TH）与脉冲无线电耦合时，将启用多用户通信。考虑到每个用户的未知信道信息已嵌入到接收信号的统计信息中，我们提出了盲均值和协方差匹配技术来联合估计所有用户的信道参数。基于均值的方法具有较低的复杂度，易于实现，而基于协方差的方法可以渐近地产生最小方差性能。通过一些修改，当跳变序列在信息符号之间变化时，它们被扩展到TH-UWB系统。由于时变代码，除了多用户副本外，还派生出独特的单用户解决方案。为了降低统计信道估计中的高昂代价，我们提出了一种新颖的调制分集辅助UWB传输方案，其中在连续脉冲上交替采用脉冲位置调制和幅度调制。提供了具有和没有符号间干扰的信号模型，并分析了信号频谱特性。由于连续接收的信号可以用作检测中的相互参考，因此不需要显式的信道估计。因此，低复杂度的模拟收发器设计是可能的。如果处理接收到的信号块，则以增加复杂性为代价获得高质量的参考。自适应地更新参考可以产生接近基于最大似然信道估计器的检测器的性能。由于高采样率模数转换器（ADC）构成了UWB数字接收器的主要障碍，因此我们分析了低分辨率ADC对具有脉冲间干扰的发射参考系统中系统性能的影响。通过分析评估联合估计和检测性能，以捕获ADC分辨率，有限信号采样和背景噪声的影响。

著录项

  • 作者

    Tang, Jin.;

  • 作者单位

    University of California, Riverside.;

  • 授予单位 University of California, Riverside.;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 167 p.
  • 总页数 167
  • 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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