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In this paper the authors present a novel approach for high precision clock synchronization in wireless systems. A concept similar to the standard FMCW (Frequency-Modulated Continuous Wave) radar principle is used to estimate the offset in time and in frequency between two wireless communication units. The novel approach allows for a synchronization of both offsets significantly below 100 ps and 10 Hz, respectively. This highly accurate synchronization is used in a prototype system to measure the distance between wireless units similar to secondary radar. The prototype works within the 5.8 GHz ISM-Band and uses a bandwidth of 150 MHz.
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