A smart antenna with pre- and post-FFT hybrid domain beamforming for broadband OFDM system

Author

Matsuoka, Hidehiro ; Kasami, Hideo ; Tsuruta, Makoto ; Shoki, Hiroki

Author_Institution

Corp. Res. & Dev. Center, Toshiba Corp., Kawasaki

Volume

4

fYear

2006

fDate

3-6 April 2006

Firstpage

1916

Lastpage

1920

Abstract

This paper proposes a smart antenna with pre-FFT beamforming based on eigenanalysis and post-FFT subcarrier diversity for broadband OFDM systems. This method can achieve signal-to-noise ratio (SNR) enhancement due to two independent eigenbeams in the pre-FFT domain and maximum ratio combining in individual subcarriers in the post-FFT domain. Two pre-FFT eigenbeams focus on the efficient combining of desired signal energy as diversity branches while they achieve lower computational load compared with the optimum post-FFT diversity which consists of the same number of FFT circuits as antennas. Computer simulation results show the complexity is reduced by 50% while keeping the similar bit error rate (BER) performance to the optimum diversity in typical cases of multipath environments

Keywords

OFDM modulation; adaptive antenna arrays; broadband networks; diversity reception; eigenvalues and eigenfunctions; fast Fourier transforms; BER; FFT hybrid domain beamforming; SNR; broadband OFDM system; eigenanalysis; eigenbeams; maximum ratio combining; signal-to-noise ratio; smart antenna; subcarrier diversity; AWGN; Adaptive arrays; Array signal processing; Bit error rate; Broadband antennas; Diversity reception; Fading; Multipath channels; OFDM modulation; Signal to noise ratio;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE

Conference_Location

Las Vegas, NV

ISSN

1525-3511

Print_ISBN

1-4244-0269-7

Electronic_ISBN

1525-3511

Type

conf

DOI

10.1109/WCNC.2006.1696588

Filename

1696588