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Proceedings Paper

Constant modulus factorization technique for smart antenna applications in mobile communications
Author(s): Alle-Jan van der Veen; Arogyaswami Paulraj
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Paper Abstract

A fundamental problem in sensor array signal processing is to separate and retrieve all independent co-channel signals that arrive at the antenna array. Such problems arise in smart antenna applications for mobile wireless communication, such as interference reduction and in- cell frequency reuse. In a mobile environment, the presence of large delay multipath makes the array manifold poorly defined, and spatial model methods are not applicable. However in case the signals have a constant modulus property (as in FDMA/FM systems like AMPS or TACS), iterative algorithms such as Godard and CMA have been used to retrieve the signals. Because of a non-convex optimization criterion, these algorithms suffer from local minima and random convergence behavior, with no satisfactory remedy known as yet. In this paper, we present an algorithm to compute the exact solution to the underlying constant modulus (CM) factorization problem. With this new approach, it is possible to detect the number of CM signals present at the array, and to retrieve all of them exactly, rejecting other, non-CM signals. Only a modest amount of samples are required. The algorithm is robust in the presence of noise, and is tested on real data, collected from an experimental set-up.

Paper Details

Date Published: 28 October 1994
PDF: 12 pages
Proc. SPIE 2296, Advanced Signal Processing: Algorithms, Architectures, and Implementations V, (28 October 1994); doi: 10.1117/12.190837
Show Author Affiliations
Alle-Jan van der Veen, Stanford Univ. (Netherlands)
Arogyaswami Paulraj, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 2296:
Advanced Signal Processing: Algorithms, Architectures, and Implementations V
Franklin T. Luk, Editor(s)

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