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Hybrid RF-Digital Feed-Forward Filter for High-Order Frequency Agile Filtering.

机译：混合RF数字前馈滤波器，用于高阶频率捷变滤波。

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摘要

Wireless network operators, spectrum managers and wireless infrastructure vendors have generated demand for frequency agile RF filters. The current state of the art frequency agile RF filters are limited to low filter order.;The digital subsystem is placed in one of the feed-forward paths, and includes a digital filter. The digital filter permits the system to have a high filter order. The digital system is bookended with frequency down and up conversion stages to permit the digital filter to be used at any RF frequency. The second feed-forward path consists of an RF system, and in the simplest case is just a transmission line. This path provides a high dynamic range route through the filter, specifically for passband signals.;Noise and attenuation analyses are performed that incorporate the non-linear effects of the digital components into conventional RF performance metrics. The noise analysis demonstrates the potential for the filter to exhibit less than 1 dB of noise figure. RF measurements are used to demonstrate proper operation of a hardware prototype. The prototype is targeted towards the RF front-end of a receiver with a dynamic interference environment at its input. Measurements demonstrate interferer suppression for operation at several bands between 800 and 1800 MHz. The group delay mismatch between the feed-forward paths is reduced with a delay line to achieve between 32 to 24 dB of attenuation for interferers with bandwidths from 1 to 8 MHz. The largest digital filter used within the prototype has 64 complex taps, thereby providing the hybrid RF-DSP FF filter with 64 tunable transfer function zeros.;The hybrid RF-DSP feed-forward filter represents a fundamental change to frequency agile RF' filter design. This fundamental change is based on harnessing the ever increasing processing power of DSP instead of the more traditional approach of incrementally improving the quality factor of tunable resonators.;This thesis introduces a frequency agile RF filter that is fundamentally different from the current state of the art. Digital and RF systems are combined in a feed-forward architecture. This architecture provides a frequency response with multiple tunable transfer function zeros. This feed-forward architecture is called the hybrid RF-DSP feed-forward filter.
机译：无线网络运营商，频谱管理者和无线基础设施供应商对频率捷变的RF滤波器产生了需求。现有技术中的频率捷变RF滤波器仅限于低阶滤波器。数字子系统放置在前馈路径之一中，并包括一个数字滤波器。数字滤波器允许系统具有较高的滤波器阶数。该数字系统具有降频和升频转换级，可以在任何RF频率下使用数字滤波器。第二个前馈路径由一个RF系统组成，在最简单的情况下只是一条传输线。该路径提供了一条通过滤波器的高动态范围路由，特别是针对通带信号。进行了噪声和衰减分析，将数字分量的非线性影响纳入了常规RF性能指标。噪声分析表明，该滤波器可能会出现小于1 dB的噪声系数。 RF测量用于演示硬件原型的正确操作。原型针对的是在输入端具有动态干扰环境的接收器的RF前端。测量结果表明，在800至1800 MHz的几个频段上，干扰源均受到抑制。前馈路径之间的群时延失配可以通过一条延迟线减少，以实现带宽为1至8 MHz的干扰源的32至24 dB的衰减。原型中使用的最大数字滤波器具有64个复数抽头，从而为混合RF-DSP FF滤波器提供了64个可调传递函数零。混合RF-DSP前馈滤波器代表了频率捷变RF'滤波器设计的根本变化。这种根本性的改变是基于利用DSP不断提高的处理能力，而不是逐步提高可调谐谐振器质量因数的更传统的方法。本论文介绍了一种频率捷变的RF滤波器，它与现有技术根本不同。 。数字和RF系统组合在前馈架构中。这种架构提供了带有多个可调传递函数零的频率响应。这种前馈架构称为混合RF-DSP前馈滤波器。

著录项

  • 作者

    Wyville, Mark.;

  • 作者单位

    Carleton University (Canada).;

  • 授予单位 Carleton University (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 201 p.
  • 总页数 201
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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