A blind calibration method for an adaptive array antenna in DS-CDMA systems using an MMSE algorithm

Author

Kobayakawa, S. ; Tsutsui, M. ; Tanaka, Y.

Author_Institution

Wireless Commun. Syst. Lab., Fujitsu Labs. Ltd., Kawasaki, Japan

Volume

1

fYear

2000

fDate

2000

Firstpage

21

Abstract

A new blind calibration method is proposed to compensate for the amplitude and phase errors in the antenna branches of DS-CDMA base stations with adaptive array antennas. The proposed method calibrates these errors using the MMSE (minimum mean square error) algorithm, requiring only the received (or transmitted) signals at the array antenna and not requiring any additional reference signal to be inserted for calibration. The proposed method and structure can be applied to both the downlink and uplink. The fast convergence property of this method ensures a tracking capability against amplitude-phase variances. In an uplink, using the proposed calibrator, a beam steering adaptive array antenna based on a directional finding algorithm of a desired signal has a BER performance that improves by about 2 dB at the BER of 10^-3 when a non-linear RF amplifier is used. We have also evaluated the downlink performance of this method when a non-linear RF amplifier is used and have confirmed its robustness against that of the amplifier

Keywords

adaptive antenna arrays; calibration; code division multiple access; convergence of numerical methods; error statistics; land mobile radio; least mean squares methods; radio links; radiofrequency amplifiers; spread spectrum communication; BER performance; DS-CDMA base stations; DS-CDMA systems; MMSE algorithm; NLMS algorithm; amplitude error compensation; amplitude-phase variances; beam steering adaptive array antenna; blind calibration method; directional finding algorithm; downlink performance; fast convergence property; minimum mean square error; nonlinear RF amplifier; phase error compensation; tracking; uplink; Adaptive arrays; Antenna arrays; Base stations; Bit error rate; Calibration; Downlink; Mean square error methods; Multiaccess communication; Phased arrays; Radiofrequency amplifiers;

fLanguage

English

Publisher

ieee

Conference_Titel

Vehicular Technology Conference Proceedings, 2000. VTC 2000-Spring Tokyo. 2000 IEEE 51st

Conference_Location

Tokyo

ISSN

1090-3038

Print_ISBN

0-7803-5718-3

Type

conf

DOI

10.1109/VETECS.2000.851410

Filename

851410