Title :
A Simple and Effective Post-FFT Beamforming Technique for QAM-OFDM Systems
Author :
Ning, Ma ; Ping´an, Li
Author_Institution :
Wuhan Univ. of Sci. & Eng., Wuhan
Abstract :
In this paper, a maximum ratio combining (MRC) approach is proposed for space-frequency processing in antenna-array-based OFDM systems with M-QAM demodulation. The proposed approach is a modified version of MRC for processing QAM signals. It combines the outputs of spatial filter-bank in frequency domain by using the estimated space-frequency channel. Compared with the existing post-FFT beamforming techniques, such as the typical DOA-based approach or the eigenvector-based approach, it exhibits computational simplicity. In addition, the IEEE 802.11g WLAN indoor channel model is used to investigate the performance of the proposed scheme.
Keywords :
OFDM modulation; antenna arrays; array signal processing; channel bank filters; channel estimation; diversity reception; eigenvalues and eigenfunctions; fast Fourier transforms; quadrature amplitude modulation; wireless channels; IEEE 802.11g; M-QAM demodulation; QAM signals; QAM-OFDM systems; WLAN indoor channel model; antenna-array-based OFDM systems; eigenvector-based approach; maximum ratio combining approach; post-FFT beamforming technique; space-frequency channel estimation; space-frequency processing; spatial filter-bank; Antennas and propagation; Array signal processing; Frequency domain analysis; Frequency estimation; Microwave antennas; Microwave technology; OFDM; Quadrature amplitude modulation; Space technology; Wireless communication; OFDM; QAM; beamforming; frequency domain;
Conference_Titel :
Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications, 2007 International Symposium on
Conference_Location :
Hangzhou
Print_ISBN :
978-1-4244-1045-3
Electronic_ISBN :
978-1-4244-1045-3
DOI :
10.1109/MAPE.2007.4393719
