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Blind Adaptive Beamformer for Cyclostationary Sources with Application to CDMA Systems
Teruyuki MIYAJIMA
Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Vol.E87A
No.5
pp.12581269 Publication Date: 2004/05/01
Online ISSN:
DOI:
Print ISSN: 09168508 Type of Manuscript: PAPER Category: Spread Spectrum Technologies and Applications Keyword: cyclostationarity, DS/CDMA, adaptive array antenna, blind algorithm, higherorder statistics,
Full Text: PDF(1.3MB)>>
Summary:
In this paper, a simple blind algorithm for a beamforming antenna is proposed. This algorithm exploits the property of cyclostationary signals whose cyclic autocorrelation function depends on delay as well as frequency. The cost function is the mean square error between the delay product of the beamformer output and a complex exponential. Exploiting the delay greatly reduces the possibility of capturing undesired signals. Through analysis of the minima of the nonquadratic cost function, conditions to extract a single signal are derived. Application of this algorithm to codedivision multipleaccess systems is considered, and it is shown through simulation that the desired signal can be extracted by appropriately choosing the delay as well as the frequency.

