Iterative message passing techniques for rapid code acquisition
MILCOM'03 Proceedings of the 2003 IEEE conference on Military communications - Volume I
IEEE Transactions on Information Theory
Capacity and mutual information of wideband multipath fading channels
IEEE Transactions on Information Theory
Bandwidth scaling for fading multipath channels
IEEE Transactions on Information Theory
The effects of timing jitter and tracking on the performance of impulse radio
IEEE Journal on Selected Areas in Communications
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Impulsive ultra-wideband (UWB) radio provides many promising features for wireless communications in a dense multipath environment. However, these features are largely the result of the enormous effective processing gain, which can make acquisition difficult at the receiver. In this paper, a recently developed theory of minimum complexity sequential detection is applied to the hybrid acquisition problem. As in previous hybrid schemes, a number of potential timing phases are checked as a group; however, a phase is disregarded as soon as it appears unlikely rather than waiting for a "winner" to be chosen from the group. Another phase then replaces the disregarded one. Analysis and simulation results indicate that the proposed scheme can improve average acquisition times for highly spread systems operating over either additive white Gaussian noise (AWGN) or multipath fading channels.