Performance of a Base Station Feedback-Type Adaptive Array Antenna with Limited Number of Feedback Bits

Jeongkeun CHOI  Yoshihiko AKAIWA  

IEICE TRANSACTIONS on Communications   Vol.E89-B   No.6   pp.1793-1798
Publication Date: 2006/06/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.6.1793
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
feedback-type adaptive array antenna,  frequency division duplex,  feed-back bit,  channel capacity,  

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Feedback-type Adaptive Array Antenna has been proposed for frequency division duplexed (FDD) system, where the mobile station (MS) measures channel characteristics and sends those back to the base station (BS). Using a higher number of feed-back bits provides better performance. However it wastes channel capacity of the up-link. On the other hand, error in feedback signals transmission causes significant performance degradation. To solve these problems, this paper proposes a method that the MS sends back the difference between the optimum weights calculated at the MS and weights which are currently used at the BS. Bit error rate performance of the system is shown under a realistic propagation condition.