使用匹配滤波器的无线网络的PHY层链路质量指示器
PHY-layer link quality indicators for wireless networks using matched-filters
摘要：
我们提出了一种新的方法来准确的无线链路质量的实时估计，使用简单的匹配滤波技术。我们的方法是基于一个简单的观察，有一部分的每个数据包传输从任何给定的节点，不改变从一个数据包到另一个，这包括前导序列用于同步的接收器，也用于媒体访问控制和路由的数据包报头中的地址信息。我们的方法可以被认为是一个通用的和简化的标准信号处理技术，通常用于在许多分组无线网络的前导检测，自动增益控制，载波侦听和其他功能的变体。通过使用能量检测和相关技术相结合，我们表明，我们可以有效地检测数据包传输的实时性，低复杂性，而无需解码的数据包本身，事实上，即使没有详细的数据包格式的知识。我们提出了广泛的实验结果，从软件定义的无线电测试平台来说明这种方法的有效性802.15.4（Zigbee）网络，即使在存在强干扰信号和低信噪比。
英文摘要：
We present a novel approach to accurate real-time estimation of wireless link quality using simple matched-filtering techniques. Our approach is based on the simple observation that there is a portion of each packet transmission from any given node that does not change from one packet to another; this includes preamble sequences used to synchronize the receiver and also address information in the packet header used for medium access control and routing. Our approach can be thought of as a generalized and simplified variant of standard signal processing techniques that are commonly used for preamble detection, automatic gain control, carrier sensing and other functions in many packet wireless networks. By using a combination of energy detection and correlation techniques, we show that we can effectively detect packet transmissions in real-time with low complexity, without decoding the packets themselves, and indeed, even without detailed knowledge of the packet format. We present extensive experimental results from a software-defined radio testbed to illustrate the effectiveness of this approach for 802.15.4 (Zigbee) networks even in the presence of strong interference signals and low SNR.
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