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On-line Calibration algorithm for Asynchronous CDMA-based antenna arrays  

Lee Chong-Hyun (서경대학교 전자공학과)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.29, no.1A, 2004 , pp. 18-30 More about this Journal
Abstract
In this paper, the calibration problem of an asynchronous CDMA-based antenna array is studied. A new iterative calibration algorithm for antenna array in the presence of frequency offset error is presented. The algorithm is applicable to a non-linear array and does not require a prior knowledge of the (direction of arrivals) DOAs of the signals of any user, and it only requires the code sequence of a reference user. The algorithm is based on the two step procedures, one for estimating both channel and frequency offset and the other for estimating the unknown array gain and phase. Consequently, estimates of the DOAs, the multi-path impulse response of the reference signal sources, and the carrier frequency offset as well as the calibration of antenna array are provided. The performance of the proposed algorithm is investigated by means of computer simulations and is verified by using field data measured through a custom-built W-CDMA test-bed.
Keywords
Asynchronous CDMA; Antenna Array; Calibration; PN code; Frequency Offset;
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