Browse > Article

Eigen-constraint minimum variance beamformer for correlated interferences  

Kim Seungil (Dept. of Electrical Electronic Engineering, Yonsei University)
Lee Chungyong (Dept. of Electrical Electronic Engineering, Yonsei University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.42, no.1, 2005 , pp. 59-64 More about this Journal
Abstract
To achieve a goal of minimum output power, the beamformer tends to cancel the desired signal if there exists correlated interference sources such as multipaths of the desired signal. In this paper, we propose a new method which overcomes the signal cancellation problem for correlated interferences. Instead of decorrelating the correlated interferences, the proposed bramformer regards them as replicas of the desired signal and coherently combines them with desired signal. This method uses an eigenvector constraint that suppresses a noise and uncorrelated interferences but keeps the desired signal and correlated interferences. Indisputably, the beamformer does not require any preliminary information on correlated interferences. Simulation results show that the proposed beamformer overcomes the signal cancellation problem and improves signal-to-noise ratio (SNR) of the array output when the correlated interferences exist.
Keywords
어레이 신호처리;상관 간섭신호 제거;ECMV 빔형성 기법;
Citations & Related Records
연도 인용수 순위
  • Reference
1 B. Widrow, K. M. Duvall, R. P. Gooch, and W. C. Newman, 'Signal Cancellation Phenomena in Adaptive Antennas: Causes and Cures,' IEEE Trans. on Antennas Propagat., vol. AP-30, no. 3, pp. 469-478, May 1982   DOI
2 J. F. Yang and M. Kaveh, 'Coherent Signal-Subspace Transformation Beamformer,' IEE Proc., vol. 137, no. 4, pp. 267-275, Aug. 1990
3 V. U. Reddy, A. Paulraj, and T. Kailath, 'Performance Analysis of the Optimum Beamformer in the Presence of Correlated Sources and Its Behavior Under Spatial Smoothing,' IEEE Trans. on ASSP, vol. ASSP-35, no. 7, pp. 927-936, July 1987   DOI
4 A. Zeira and B. Friedlander, 'Interpolated Array Minimum Variance Beamforming for Correlated Interference Rejection,' ICASSP-96, pp. 3165-3168, May 1996   DOI
5 D. B. Ward, 'Technique for Broadband Correlated Interference Rejection in Microphone Arays,' IEEE Trans. on SAP, vol. 6, no. 4, pp. 414-417, July 1998
6 A. F. Naguib, Adaptive Antennas for CDMA Wireless Networks, Ph.D thesis, Standford University, Aug. 1996
7 S. U. Pillai, Array Signal Processing, New York, NY: Springer Verlag, 1989
8 J. Capon, 'High-Resolution Frequency Wave-number Spectrum Analysis,' Proc. IEEE, vol. 57, pp. 1408-1418, Aug. 1969   DOI
9 B. D. Van Veen and K. M. Buckley, 'Beamforming: A versatile Approach to Spatial Filtering,' IEEE ASSP Magazine, pp. 4-22, april, 1988   DOI   ScienceOn