EURASIP Journal on Wireless Communications and Networking
Volume 2008 (2008), Article ID 195948, 14 pages
doi:10.1155/2008/195948
Research Article

Identification of LOS in Time-Varying, Frequency Selective Radio Channels

Serhan Yarkan and Hüseyin Arslan

Department of Electrical Engineering, University of South Florida, 4202 E. Fowler Avenue, ENB-118, Tampa, FL 33620, USA

Received 16 August 2007; Revised 15 December 2007; Accepted 22 February 2008

Academic Editor: Chia-Chin Chong

Copyright © 2008 Serhan Yarkan and Hüseyin Arslan. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A method is proposed to identify the existence of line-of-sight (LOS) for time-varying, frequency selective radio channels. The proposed method considers the second-order statistical characteristics of underlying process in the channel taps. Identification is established by comparing the autocorrelation coefficients of the first tap with those of any other tap when the other tap reaches its coherence time. Numerical results and related discussions are presented considering several practical scenarios.