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Cellular Networks - Positioning, Performance Analysis, by Agassi Melikov

By Agassi Melikov

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The time delay error of both methods is about 1nm. 02um, all of the other parameters are the same. 31(c) shows the measurement we need to reconstruct the signals is up to 30%. And much more details of the signal can be seen. And the time delay error is 1nm. Comparing these two simulations, the conclusion is that 1) by using 10% of Nyquist sampling rate, the accuracy of TOA estimation is the same as that by using full Nyquist rate. 2) By enlarging the sampling rate by 30%, more detail information of the signal can be recovered.

Providing universal location services using a wireless E911 location network. 4, pp. W. (2006). Mobile positioning based on relaying capability of mobile stations in hybrid wireless networks. IEE Proceedings on Communications, Vol. 762-770 0 2 Positioning in Cellular Networks Mirjana Simi´c and Predrag Pejovi´c University of Belgrade Serbia 1. Introduction Cellular networks are primarily designed to provide communication to mobile users. Besides the main application, determining location of mobile users (stations) within the cellular networks like Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) became an interesting additional feature.

24. UWB signal is a kind of signals which occupies several GHz of bandwidth by modulating an impulse-like waveform. A typical baseband UWB signal is Gaussian monocycle obtained by differentiation of the standard Gaussian waveform (Roy, 2004). A second derivative of Gaussian pulse is given by t p(t ) = A[1 − 4π( 2 t 2 −2π( Td ) ) ]e Td (42) Where the amplitude A can be used to normalize the pulse energy. 25 shows the time domain waveform of (42). 25, we see that the duty cycle (the pulse duration divided by the pulse period) is really small.

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