Wider Application of Radiolocation in Digital Wireless Communication
In this final chapter, we look ahead at the application of our radiolocation methodology beyond the 802.11b framework, and in doing so, we retain our main objective of radiolocating every wireless packet in real time.
Any analysis of the incoming wave must take into account the fact that the wave is modulated. In radiolocation based on the signal strength, this means that amplitude changes must not corrupt the measurements required to determine the wave’s direction. As we discuss in Sects. 5.4 and 10.6.2, packets in the 802.11b standard are purely phase-modulated, offering ample time to serially collect signal-strength data from multiple detectors (antenna elements); variations in the wave’s amplitude are insignificant from one measurement to the next.
Other wireless standards include amplitude modulation, and finding a part of the packet’s waveform that is suitable for power measurement becomes the central issue. There are two parts to this issue: first, the appropriate segment of the waveform must be detected in real time, and second, signal strengths from multiple detectors must be collected within it, without modulation interference. The more complex the waveform, and the larger the number of radiolocation antenna elements, the more stringent will be the requirements on the architecture of the radiolocator. In this chapter, we look at some of the prevalent wireless standards, and draw conclusions about feasible radiolocation strategies.
KeywordsAntenna Element Master Node Beacon Frame Wireless Standard Virtual Carrier
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