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Iterative Synchronization of Multiuser Ultra-Wideband Signals

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E. Ekrem, M. Koca, H. DeliƧ, IEEE Transactions on Wireless Communications, Vol. 9, No. 10, pp. 3040-3051, October 2010.

Abstract- In this paper, two novel iterative synchronization methods are proposed for chip-interleaved time-hopping ultra wideband signals subject to intersymbol and multiple access interferences. One of the methods is blind and the other is a data-aided approach. Both synchronization algorithms are soft-input and soft-output devices which receive a posteriori probability of each chip from the minimum-mean-square error filter that suppresses both intersymbol and multiple access interferences. Using this soft information and the structure of time-hopping codes, the blind synchronizer produces the probabilities of time delays which are fed into the channel decoder. In addition to the knowledge of time-hopping codes and the soft information coming from minimum-mean-square error filter, the data-aided synchronizer uses training sequence in the generation of the probabilities of time delays. Although channel decoder for chip-level interleaved systems is rather simple, here it is redesigned to incorporate soft information about time delays. The resulting receivers perform as well as the iterative equalization with perfect timing information and catches the single user performance at moderate signal-to-noise ratios.
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