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IEEE 802.11b WLAN is widely used to implement Wi-Fi based Time Difference of Arrival (TDoA) indoor localization. This paper presents a novel IEEE 802.11b baseband receiver and the corresponding localization system. Frame detector and phase recovery block are dedicated to frame reception and frequency offset compensation. Baker code re-correlator is(More)
Indoor positioning has wide prospects in emergency positioning, public safety, and exhibition services and has become a research focus. This paper presents a 2D indoor positioning system based on Wi-Fi and TDOA on USRP platform. Meanwhile, the sending and receiving of Wi-Fi signal are implemented for measurement and the algorithm of frequency offset(More)
In this paper, a new method of demodulation of continuous phase binary FSK signal is presented, during FSK demodulation, the FSK signal produces In-phase signal (I(t)) and Quadrature signal (Q(t)). And method of Gardner synchronization is used for bit synchronization. When using Gardner synchronization, some changes must be made so that it is suitable for(More)
In this paper, a new method for demodulation of FSK signal with severe impulse interference is presented. This method is suitable for incoherent demodulation of FSK signal. At first, a unique part of amplitude limiting is used to reduce the influence of strong impulse interference; then, sometimes, strong impulse interference changes FSK sin wave upside(More)
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