Title :
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
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;
Conference_Titel :
Wireless Communications, Networking and Mobile Computing, 2007. WiCom 2007. International Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-1311-9
DOI :
10.1109/WICOM.2007.29
