A variable step-size CM array algorithm for fast fading channels

Author

Mathur, Amit ; Keerthi, Arvind V. ; Shyok, J.J.

Author_Institution

Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA

Volume

45

Issue

4

fYear

1997

fDate

4/1/1997 12:00:00 AM

Firstpage

1083

Lastpage

1087

Abstract

A new constant modulus (CM) array algorithm with a time-varying step size is presented. It is designed for use in a cascade multistage system where each beamformer stage recovers one cochannel source. We assume that each source has a small angular spread and that the antenna elements are closely spaced. For this scenario, the new algorithm ensures that a stage tracks the same source during fast fading conditions, thus yielding reliable source estimation in a nonstationary environment. We present the cost function associated with the algorithm and compare it with that of the original CM array. Computer simulations for Rayleigh fading channels are presented to illustrate the improved tracking behavior of the multistage CM array

Keywords

Rayleigh channels; array signal processing; direction-of-arrival estimation; fading; multipath channels; tracking; Rayleigh fading channels; beamformer stage; cascade multistage system; closely spaced antenna elements; cochannel source recovery; computer simulations; constant modulus array algorithm; cost function; fast fading channel; multipath; multistage CM array; nonstationary environment; small angular spread; source estimation; time-varying step size; tracking behavior; variable step-size CM array algorithm; Adaptive arrays; Adaptive systems; Antenna arrays; Computer simulation; Cost function; Fading; Rayleigh channels; Signal processing; Signal processing algorithms; Yield estimation;

fLanguage

English

Journal_Title

Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1053-587X

Type

jour

DOI

10.1109/78.564199

Filename

564199