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A novel adaptive beamforming algorithm for antenna array CDMA systems with strong interferers
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DOI：10.1109/TVT.2002.801546.png)
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Blind beamforming based on the maximum signal-to-noise ratio (MSNR) can improve the performance of the array system only when the processing gain of the given code-division multiple-access (CDMA) system is high enough such that the desired signal can become dominant after the despreading [3], [15]. In this paper, we consider a maximum signal-to-(interference plus noise) ratio (MSINR) beamforming. The MSINR performance criterion is chosen to effectively deal with strong interferers. It is shown in this paper that a blind MSINR beamforming is possible by directly utilizing input and output signals of correlators of the CDMA systems. In addition, we propose an adaptive beamforming algorithm at a lower computational complexity-about O(7.5N)-where N is the number of antenna elements of the array system. Simulation results are presented in various signal environments to show the performance of the proposed adaptive algorithm.
Keyword:
adaptive arrays
code-division multiple access (CDMA)
generalized eigenvector
Lagrange multiplier
maximum signal-to-(interference plus noise) ratio (MSINR) beamforming
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7.1
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