US 7,321,550 B2
Method of equalization in an OFDM system
Yung-An Kao, Hsinchu (Taiwan); Chang-Lung Hsiao, Hsinchu (Taiwan); Po-Lin Chiu, Hsinchu (Taiwan); and Shih-Kai Lee, Hsinchu (Taiwan)
Assigned to Industrial Technology Research Institute, Hsinchu (Taiwan)
Filed on Feb. 17, 2004, as Appl. No. 10/778,087.
Prior Publication US 2005/0180461 A1, Aug. 18, 2005
Int. Cl. H04J 11/00 (2006.01)
U.S. Cl. 370—208  [375/260; 375/349; 375/229; 370/210] 23 Claims
OG exemplary drawing
 
1. An equalization method suitable for use in a receiver in an orthogonal frequency division multiplexing (OFDM) system utilizing a plurality of sub-carriers, wherein the receiver includes an outer receiver for decoding, the method comprising:
receiving an input signal including at least one preamble symbol containing a training sequence and a plurality of informative OFDM symbols each containing a serial stream of samples;
performing compensations for each of the informative OFDM symbols, including
converting the serial stream of samples into parallel samples,
performing a fast Fourier transform (FFT) of the parallel samples to obtain, in the frequency spectrum, a plurality of data symbols, wherein each data symbol corresponds to a sub-carrier,
compensating the data symbols for at least one first phase distortion,
compensating the data symbols for at least one second phase distortion; and
providing at least one amplitude distortion factor to the outer receiver.