Title :
MI-NLMS adaptive beamforming algorithm for OFDM system
Author :
Islam, M. ; Misran, N.
Author_Institution :
Fac. of Eng. & Technol., Multimedia Univ., Melaka
Abstract :
OFDM is a multi-carrier technique that recently has received more attention for high speed wireless communication. A matrix inversion normalized least mean square (MI-NLMS) adaptive beamforming algorithm was developed for OFDM system. The algorithm was developed by combining the sample matrix inversion (SMI) and the normalized least mean square (NLMS) algorithms taking the individual good aspects of both algorithms; the block adaptive and sample by sample techniques. Based on the obtained results, it appears that the MI-NLMS has more reliable and faster convergence compared to the least mean square (LMS) algorithm. Simulation results showed that bit error rate (BER) improves 81 % by using 8 elements antenna array compared to single element antenna and 92% at 256 pilots compared to BER at 32 pilots for the MI-NLMS algorithm.
Keywords :
OFDM modulation; antenna arrays; array signal processing; error statistics; matrix inversion; BER; MI-NLMS adaptive beamforming algorithm; OFDM system; antenna arrays; bit error rate; high speed wireless communication; matrix inversion normalized least mean square methods; multicarrier technique; sample matrix inversion; Adaptive arrays; Antenna arrays; Antennas and propagation; Array signal processing; Bit error rate; Convergence; Frequency domain analysis; Interchannel interference; OFDM; Space technology; BER; Digital beamforming (DBF); convergence; mean square error;
Conference_Titel :
Antennas and Propagation Conference, 2008. LAPC 2008. Loughborough
Conference_Location :
Loughborough
Print_ISBN :
978-1-4244-1893-0
Electronic_ISBN :
978-1-4244-1894-7
DOI :
10.1109/LAPC.2008.4516943
