An ML Timing Estimator in UWB Communication Systems

Sangchoon KIM  Kyoungsoo SON  Bongsoon KANG  

IEICE TRANSACTIONS on Communications   Vol.E91-B    No.1    pp.339-342
Publication Date: 2008/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.1.339
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
ultra-wideband,  binary pulse amplitude modulation,  synchronization,  ML estimation,  Cramer-Rao bound,  

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The problem of estimating the timing of ultra-wide band signal is considered in the letter. We develop a maximum likelihood timing estimation algorithm for binary PAM DS-UWB systems. The derivation of the proposed algorithm is based on the known training sequence and AWGN channel. The Cramer-Rao Bound (CRB) for the ML timing estimator is presented as a performance benchmark. It is found via numerical results that the ML timing estimator on AWGN channels achieves the CRB when the values of Eb/N0 for the observation bits Nb=50 are sufficiently high. Finally, the performance of the proposed ML estimator is evaluated on actual channels with intersymbol interference such as an IEEE UWB indoor multipath channel model.