A Combined Switched Beam-Forming and Adaptive Beam-Forming Algorithm for OFDM Systems with Antenna Array

Author

Liu, Shenghai ; Feng, Suili ; Ye, Wu

Author_Institution

Sch. of Electron. & Inf. Eng., South China Univ. of Technol., Guangzhou

fYear

2007

fDate

21-25 Sept. 2007

Firstpage

89

Lastpage

92

Abstract

In this paper, a combined switched beam-forming and adaptive beam-forming algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems with antenna arrays in multi-path fading channels. Firstly, multiple beams are generated by using a set of known weight vectors to cover the direction of arrival (DOA) range from 0 to 360 degrees. Secondly, two adjacent beams, which contain the same delayed multi-path with the largest power, can be selected by calculating the correlation of each beam with a reference signal. Thirdly, the two selected beams are optimally combined by using adaptive beam- forming algorithms such as sample matrix inversion (SMI), etc. Computer simulation results show that the proposed algorithm has better performance than conventional MMSE based pre-FFT adaptive beam-forming algorithm in multi-path fading channels.

Keywords

OFDM modulation; antenna arrays; array signal processing; direction-of-arrival estimation; fading channels; fast Fourier transforms; least mean squares methods; multipath channels; FFT; OFDM systems; adaptive beamforming algorithm; antenna array; conventional MMSE; direction of arrival; fast Fourier transform; multipath fading channels; orthogonal frequency division multiplexing systems; sample matrix inversion; switch beamforming combination; Adaptive algorithm; Adaptive arrays; Antenna arrays; Array signal processing; Delay; Fading; OFDM; Receiving antennas; Signal processing; Wireless LAN;

fLanguage

English

Publisher

ieee

Conference_Titel

Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on

Conference_Location

Shanghai

Print_ISBN

978-1-4244-1311-9

Type

conf

DOI

10.1109/WICOM.2007.29

Filename

4339804