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Design and Analysis of Spectrum Scanners Based on Passive, Linear Periodically Time-Varying Circuits

机译：基于无源线性周期性时变电路的频谱扫描仪的设计与分析

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摘要

Spectrum sensing finds its use is many applications. With modern communication systems moving towards Cognitive Radios (CRs) to better utilize the available spectrum, spectrum sensing is a key enabling functionality that allows the detection of primary users and interferes to support spectrum sharing. Spectrum sensing can also be useful in security applications that require a certain degree of RF spectrum awareness. In addition, it can be used for built-in self-test like transmitter tuning by measuring the output spectrum to allow spur reduction and digital predistortion.;To be useful, the spectrum scanners used for sensing should be able to handle large blockers and detect weak signals at the same time. Thus both good linearity and high sensitivity are desired. In addition, these scanners need to be highly programmable and selective while incurring a low power cost. In this research we have addressed the issues that plague traditional spectrum scanners by using the recent technique of Filtering by Aliasing (FA). The FA-based spectrum scanner is a passive structure that uses simple but linear, periodically time-varying (LPTV) RC circuits. This LPTV circuit is shown to provide a high spurious-free dynamic range, precise resolution bandwidths while still consuming very low power.;In this dissertation, the FA technique is briefly explained, and the design considerations and implementation of a spectrum scanner IC that achieves excellent linearity and low power as compared to state-of-the-art designs is presented. In addition, a theoretical analysis of some of the limiting factors of the passive LPTV scanner is presented together with some circuit and/or signal-processing solutions.;Chapters 2 and 3 of this dissertation are the reprint of a paper that is to be published in full in the IEEE Journal of Solid-States Circuits (JSSC). The dissertation author is the primary investigator and Professor Sudhakar Pamarti supervised the research which forms the basis for this paper. Dr. Mansour Rachid and Professor Shanthi Pavan from IIT, Madras collaborated on this work as well.;Chapters 4 and 5 of this dissertation are the reprint of a paper under preparation to be submitted in part or in full to the IEEE Transactions of Circuits and Systems-1 (TCAS-1). The dissertation author is the primary investigator and Professor Sudhakar Pamarti supervised the research which forms the basis for this paper. By the virtue of being independent papers, there is a slight degree of content overlap between Chapters 2-3 and 4-5.
机译：频谱感测发现它的用途很广泛。随着现代通信系统向认知无线电（CR）转移，以更好地利用可用频谱，频谱感测是一项关键的启用功能，可以检测主要用户并进行干扰以支持频谱共享。频谱感测在需要一定程度的RF频谱感知的安全应用中也很有用。此外，它还可以用于内置自检，例如发射机调谐，方法是通过测量输出频谱来减少杂散和数字预失真。;有用的是，用于感测的频谱扫描仪应该能够处理大的阻塞并检测同时发出微弱的信号。因此，既需要良好的线性又需要高灵敏度。此外，这些扫描仪需要高度可编程和选择性，同时又要降低功耗。在这项研究中，我们已经通过使用别名过滤（FA）的最新技术解决了困扰传统频谱扫描仪的问题。基于FA的频谱扫描仪是一种无源结构，它使用简单但线性的，周期性的时变（LPTV）RC电路。该LPTV电路可提供高无杂散的动态范围，精确的分辨率带宽，同时仍消耗非常低的功率。本文简要介绍了FA技术，并给出了实现该功能的频谱扫描仪IC的设计注意事项和实现方法。与最新设计相比，具有出色的线性度和低功耗。此外，还对无源LPTV扫描仪的一些局限性因素进行了理论分析，并给出了一些电路和/或信号处理解决方案。本论文的第2章和第3章是将要发表的论文的转载。在《 IEEE固态电路杂志》（JSSC）中有完整介绍。论文的作者为主要研究者，Sudhakar Pamarti教授对研究进行了监督，为本文奠定了基础。马德拉斯IIT的Mansour Ra​​chid博士和Shanthi Pavan教授也参与了这项工作。本论文的第4章和第5章是正在准备中的论文的转载，将部分或全部提交给IEEE Transactions of Circuits和系统-1（TCAS-1）。论文的作者为主要研究者，Sudhakar Pamarti教授对研究进行了监督，为本文奠定了基础。由于是独立论文，因此在第2-3章和第4-5章之间存在少量的内容重叠。

著录项

  • 作者

    Sinha, Neha.;

  • 作者单位

    University of California, Los Angeles.;

  • 授予单位 University of California, Los Angeles.;
  • 学科 Electrical engineering.;Engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 117 p.
  • 总页数 117
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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