Title :
A novel adaptive beamforming algorithm for antenna array CDMA systems with strong interferers
Author :
Choi, Seungwon ; Choi, Jinho ; Im, Heung-Jae ; Choi, Byungcho
Author_Institution :
Dept. of Electr. Eng., Hanyang Univ., Seoul, South Korea
fDate :
9/1/2002 12:00:00 AM
Abstract :
Blind beamforming based on the maximum signal-to-noise ratio (MSNR) can improve the performance of an 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 despreading (see Choi, S. and Shim, D., IEEE Trans. Veh. Technol., vol.49, p.1793-1806, 2000; Choi, S. and Yun, D., IEEE Trans. Antennas Propagat., vol.45, p.1393-1404, 1997). We consider a maximum signal-to-interference-plus-noise ratio (MSINR) beamforming. The MSINR performance criterion is chosen to deal with strong interferers effectively. It is shown that blind MSINR beamforming is possible by directly utilizing the 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.
Keywords :
3G mobile communication; adaptive antenna arrays; array signal processing; code division multiple access; computational complexity; correlators; mobile radio; radiofrequency interference; CDMA systems; SINR; adaptive beamforming algorithm; antenna array; blind beamforming; code-division multiple-access; computational complexity; maximum SNR; maximum signal-to-interference-plus-noise ratio; maximum signal-to-noise ratio; mobile communication; strong interferers; third generation mobile communication; Adaptive arrays; Antenna arrays; Antennas and propagation; Array signal processing; Computational complexity; Correlators; Multiaccess communication; Performance gain; Signal processing; Signal to noise ratio;
Journal_Title :
Vehicular Technology, IEEE Transactions on
DOI :
10.1109/TVT.2002.801546