Adaptive Array Antenna Using Array Antennas as Element Antennas

Hiroyuki YAMASUGE  Ryuji KOHNO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E85-B    No.10    pp.1921-1926
Publication Date: 2002/10/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Mobile Multimedia Communications)
Category: 
Keyword: 
adaptive array antenna,  smart antenna,  LMS algorithm,  adaptive sectored antennas,  

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Summary: 
An adaptive array antenna should be applied for suppression of CCI in the spatial domain. However, the adaptive array antenna has some problems as follows. Because the adaptive array antenna takes a long time to converge to the optimum antenna weights, it's hard to track in case of quick varying channel. On the other hand, processing burden increases with the number of elements in the array antenna. To solve these problems, we propose an adaptive array antenna using array antenna as element antennas, the so-called "Layered array antenna." At the 1st layer, sector area are defined. We can change the sector areas according to the DOA distribution, because the sector areas are defined by the antenna weights. At the 2nd layer, MMSE is performed. Interference that couldn't be suppressed at the 1st layer is suppressed at the 2nd layer. By the proposed system, we confirmed higher convergence speed while relieving processing complexity.