A novel adaptive beamforming algorithm for a smart antenna system in a CDMA mobile communication environment

Author

Choi, Seungwon ; Shim, Donghee

Author_Institution

Sch. of Electr. & Comput. Eng., Hanyang Univ., Seoul, South Korea

Volume

49

Issue

5

fYear

2000

fDate

9/1/2000 12:00:00 AM

Firstpage

1793

Lastpage

1806

Abstract

An alternative way of adaptive beamforming is presented. The main contribution of the new technique is in its simplicity with a minimal loss of accuracy. The total computational load for computing a suboptimal weight vector from each new signal vector is about O(2N²+5N). It can further be reduced down to O(3N) by approximating the autocorrelation matrix with the instantaneous signal vector at each snapshot. The required condition on the adaptive gain for the proposed algorithm to converge is derived analytically. The proposed beamforming algorithm is applied to the base station of a code-division-multiple access (CDMA) mobile communication system. The performance of the proposed method is shown in multipath fading communication channels in terms of the signal-to-interference+noise ratio (SINR), the bit error rate (BER), and the achievable capacity of a given CDMA cell/sector

Keywords

adaptive antenna arrays; antenna radiation patterns; array signal processing; cellular radio; channel capacity; code division multiple access; computational complexity; error statistics; fading channels; multipath channels; multiuser channels; optimisation; radiofrequency interference; BER; CDMA cell/sector; CDMA mobile communication system; Lagrange multiplier; SINR; achievable capacity; adaptive antenna array design; adaptive beamforming algorithm; adaptive gain; autocorrelation matrix approximation; base station; beampattern; bit error rate; code-division-multiple access; instantaneous signal vector; maximization procedure; multipath fading communication channels; performance; signal vector; signal-to-interference+noise ratio; smart antenna system; suboptimal weight vector; total computational load; Adaptive arrays; Algorithm design and analysis; Array signal processing; Autocorrelation; Base stations; Bit error rate; Communication channels; Fading; Mobile communication; Multiaccess communication;

fLanguage

English

Journal_Title

Vehicular Technology, IEEE Transactions on

Publisher

ieee

ISSN

0018-9545

Type

jour

DOI

10.1109/25.892584

Filename

892584