Wireless LAN White Papers
Optimum Beamforming for Pre-FFT OFDM Adaptive Antenna Array
Overview It is well known that Orthogonal Frequency-Division Multiplexing (OFDM) is robust to frequency-selective fading in wireless channels due to the exploitation of a guard interval that is inserted at the beginning of each OFDM symbol. However, once delayed signals beyond the guard interval are introduced in a channel with a large delay spread, intersymbol interference causes a severe degradation in the transmission performance. This paper proposes a novel pre-Fast Fourier Transform (FFT) OFDM adaptive antenna array, which requires only one FFT processor at a receiver, for suppressing such delayed signals. The paper derives the optimum weight set for beamformers based on the Maximum Signal-to-Noise-and-Interference power Ratio (Max-SNIR) and the Minimum Mean Square Error (MMSE) criteria, respectively.
| Publisher | Institute of Electrical and Electronics Engineers | File Format | |
|---|---|---|---|
| Date Published | July 2004 | Downloads | 2 |
| Format | White Papers | ||
| Topics | |||
-
Did you find this white paper useful? 2 out of 3 users found this white paper useful
White Paper RSS
Download
