Cramer-Rao lower bounds for the time delay estimation of UWB signals
Zhang, J.
Kennedy, R.A.
Abhayapala, T.D.
Dept. of Telecommun. Eng., Australian Nat. Univ., Canberra, ACT, Australia;
This paper appears in: Communications, 2004 IEEE International Conference on
Publication Date: 20-24 June 2004
Volume: 6,
On page(s): 3424- 3428 Vol.6
ISSN:
ISBN: 0-7803-8533-0
INSPEC Accession Number: 8152692
Digital Object Identifier: 10.1109/ICC.2004.1313180
Current Version Published: 2004-07-26
Abstract
In this paper, we present the Cramer-Rao lower bounds (CKLBs) for the time delay estimation of UWB signals which could be tight lower bounds for the theoretical performance limits of UWB synchronizers. The CRLBs are investigated for both single pulse systems and time hopping systems in AWGN and multipath channels. Insights are given into the relationship between CRLBs for different Gaussian monocycles. It is found that larger number of multipath signals implies higher CRLBs and inferior performance of synchronizers, and multipath interference on CRLBs can not be eliminated completely except in very special cases. As every estimate of time delay could not be perfect, the least influence of the synchronization error on the performance of receivers is quantified.
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