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Cross-Correlation Based
Estimation of Multipath
Propagation Channels

Athina Petropulu and Haralambos Pozidis
Drexel University
Electrical and Computer Engineering Department
Philadelphia, PA 19104
tel: (215) 895-2358
fax: (215) 895-1695
email: athina@artemis.ece.drexel.edu

Kenneth Abend
Gorca Systems, Inc.
P.O. Box 2325
Cherry Hill, NJ 08034
tel: (609) 273-8200

Abstract We propose a novel method for the reconstruction of an unknown signal that propagates in the presence of multipath. By oversampling the received sequence, or through spatial diversity, we first form a single input/two output problem. We then estimate the multipath effect by applying cross-correlation based operations of the two outputs, and recover the input signal via inverse filtering. The method is computationally attractive as compared to higher-order spectra based methods. It is not sensitive to errors in channel length estimates and performs better in low SNR's as compared to existing second-order statistics based methods. We show how the method can lead to a novel solution to the problem of estimating the propagation channels in radar applications.



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