Rapid search algorithms for code acquisition in UWB impulse radio communications
IEEE Journal on Selected Areas in Communications
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Signal acquisition is a critical step for the ultrawideband (UWB) communication link to be set up, thus, accurate acquisition performance analysis is of practical importance. In this paper, we analyze the pulse-level acquisition performance of differential coherent and noncoherent acquisition schemes combined with a novel hopping method, nonconsecutive search (NCS) and path diversity (PD) for fast and low-complexity UWB acquisition over multipath channels. We derive the receiver output statistics and acquisition probabilities valid for arbitrary order of path diversity and for both differential and noncoherent acquisitions. Furthermore, using a generating function (GF)-based method, we accurately evaluate the mean, variance and the distribution function of the acquisition time TA, accounting for the effect of multiple co-channel interferers and multipath fading channels. Simulation and numerical results verify our analysis and show the large performance enhancement realized by NCS/PD than the serial search.