A subspace-based online calibration algorithm for an asynchronous CDMA-based antenna array

  • Authors:

  • Chong Hyun Lee;Joohwan Chun

  • Affiliations:

  • Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Gusong-dong, Yusong-gu, 305-701 Taejon, South Korea;Department of Electrical Engineering, Korea Advanced Institute of Science and Technology, 373-1 Gusong-dong, Yusong-gu, 305-701 Taejon, South Korea

  • Venue:
  • Signal Processing
  • Year:
  • 2002

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Abstract

A new iterative calibration algorithm is presented for an asynchronous CDMA-based antenna array in the presence of unknown gain and phase errors. The algorithm is applicable to a non-linear array where the number of signals could be greater than the number of antennas. It does not require a prior knowledge of the direction of arrivals (DOAs) of the signals of any user but requires the code sequence of a reference user. The proposed algorithm provides us with estimates of the DOAs, the multi-path impulse response of the reference signal source, and the calibration of the antenna gain and phase, even under a multiple access interference. We verify the algorithm by using synthetic data as well as field data measured through a custom-built W-CDMA test bed.