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Misadjustment and tracking analysis of the constant modulus array

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3 Author(s)
Keerthi, A.V. ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; Mathur, A. ; Shynk, J.J.

The constant modulus (CM) array is a blind adaptive beamformer that can separate cochannel signals. A follow-on adaptive signal canceler may be used to perform direction finding of the source captured by the array. In this paper, we analyze the convergence and tracking properties of the CM array using a least-mean-square approximation. Expressions are derived for the misadjustment of the adaptive algorithms, and a tracking model is developed that accurately predicts the behavior of the system during fades. It is demonstrated that the adaptive canceler contributes more to the overall misadjustment than does the adaptive CM beamformer. Computer simulations are presented to illustrate the transient properties of the system and to verify the analytical results

Published in:

Signal Processing, IEEE Transactions on  (Volume:46 ,  Issue: 1 )

Date of Publication:

Jan 1998

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