MI-NLMS adaptive beamforming algorithm for smart antenna system applications

• Published in: Journal of Zhejiang University. A. Science Vol. 7; no. 10; pp. 1709 - 1716
• Main Authors: Mohammad, Tariqul Islam, Zainol, Abidin Abdual Rashid
• Format: Journal Article
• Language: English
• Published: Department of Electrical, Electronics and System Engineering, Faculty of Engineering, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor D.E., Malaysia 01.10.2006
• Subjects: LMS; MI-NLMS; NLMS; 智能天线; 移动通信; Normalized LMS (NLMS); Beamforming algorithm; Least Mean Square (LMS); Smart antenna; Matrix Inversion NLMS (MI-NLMS)
• ISSN: 1673-565X; 1862-1775
• DOI: 10.1631/jzus.2006.A1709

A Matrix Inversion Normalized Least Mean Square （MI-NLMS） adaptive beamforming algorithm was developed for smart antenna application. The MI-NLMS which combined the individual good aspects of Sample Matrix Inversion （SMI） and the Normalized Least Mean Square （NLMS） algorithms is described. Simulation results showed that the less complexity MI-NLMS yields 15 dB improvements in interference suppression and 5 dB gain enhancement over LMS algorithm, converges from the initial iteration and achieves 24% BER improvements at cochannel interference equal to 5. For the case of 4-element uniform linear array antenna, MI-NLMS achieved 76% BER reduction over LMS algorithm.