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Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers (1994)
Pacific Grove, CA, USA
Oct. 31, 1994 to Nov. 2, 1994
ISSN: 1058-6393
ISBN: 0-8186-6405-3
pp: 1180-1184
P. Wei , Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
J.R. Zeidler , Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
W.H. Ku , Dept. of Electr. & Comput. Eng., California Univ., San Diego, La Jolla, CA, USA
ABSTRACT
This paper studies the ability of the exponentially weighted RLS algorithm to track a Doppler shifted BPSK communications signal. This is modeled as a chirped AR1 process in Gaussian white noise. Expressions for the optimum Wiener filter, noise misadjustment, and lag misadjustment are shown. It is shown that as in the chirped sinusoid case the error can be written in terms of the forgetting rate /spl beta/=1-/spl lambda/ of the RLS algorithm; the noise misadjustment is of the order /spl beta/ and lag misadjustment of order 1//spl beta//sup 2/. However, as the bandwidth of the signal increases the relative lag misadjustment is shown to decrease.<>
INDEX TERMS
least mean squares methods, recursive estimation, adaptive signal processing, Doppler effect, Doppler shift, white noise, autoregressive processes, phase shift keying, Wiener filters, filtering theory, adaptive filters, land mobile radio, radiowave propagation
CITATION

P. Wei, J. Zeidler and W. Ku, "Adaptive recovery of a Doppler shifted mobile communications signal using the RLS algorithm," Proceedings of 1994 28th Asilomar Conference on Signals, Systems and Computers(ACSSC), Pacific Grove, CA, USA, 1995, pp. 1180-1184.
doi:10.1109/ACSSC.1994.471645
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