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Thus, a TDOA (Time Difference of Arrival) technique has been applied [12].
In the end, the conclusion is presented in Section 5. Assuming that all reader antennas emit pure cosine signals, we can utilize the phase of arrival technique to measure distance which does not exceed half of the signal wavelength.
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As already analyzed, among the available ranging techniques defined by the IEEE 802.15.4 standard [1], within ADLU, the range estimates are obtained using the two-way time-of-arrival technique depicted in Figure 2. Regarding the localization process, ADLU adopts the time-of-arrival triangulation of ranges technique defined by the standard.
Localization can be done by different methods, e.g. by received signal strength measurements, angle-of arrival, or time-of-arrival techniques implemented in radio frequencies or by using acoustic waves.
Existing range measurement techniques for RFID-based application include the time of arrival (TOA) technique [1 4], the time difference of arrival (TDOA) technique [5, 6], the phase of arrival (POA) technique [7 13], and the received signal strength indicators (RSSI) technique [14, 15].
Thanks to their ultra wideband (UWB) larger than 500 MHz, UWB signals can be used for highly accurate positioning using the time of arrival (TOA) technique.
In [14,17], a localization service utilizing UWB is studied and it is concluded that in general, thanks to the high time resolution of UWB impulses, the time of arrival (TOA) technique is capable of providing sufficient spatial resolution for a variety of applications.
We compare existing time delay of arrival estimation techniques between pairs of widely spaced microphones and introduce a novel efficient hierarchical localization algorithm.
Time-difference-of-arrival (TDoA) techniques could be adopted in principle, but they require perfect synchronization among different SU receivers, which is not always possible in CR systems.
The BS uses an autoregression-based SU and PU arrival rate prediction technique, measurement methods for collaborative utility perception, and maximum achievable data rate on different channels.
This paper presents a new time of arrival (TOA) estimation technique using an improved energy detection (ED) receiver based on the empirical mode decomposition (EMD) in an impulse radio (IR) 60 GHz millimeter wave (MMW) system.
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