A METHOD FOR SIGNAL PROCESSING AND A SIGNAL PROCESSOR IN AN OFDM SYSTEM

摘要

A method of signal processing for a receiver for OFDM encoded digital signals. The OFDM encoded digital signals are transmitted as data symbol sub-carriers in several frequency channels. A subset of the sub-carriers is in the form of pilot sub- carriers having a pilot value (ap) known to the receiver. First, a received signal (yo)is obtained, followed by a first estimation of a pilot channel transfer function (Ho)at pilot sub-carriers from said received signal(y o) and said known pilot values (ap). Then a second estimation of a channel transfer function (H1) is performed at all sub-carriers from said pilot channel transfer function (H o). A third estimation of a derivative ( H'1) of the channel transfer function ( H1) isperformed from the channel transfer function (H1) and a channel transfer function (H3)from a past OFDM symbol. Finally, a fourth estimation of a cleaned received signal (y1) is performed from said derivative (H'1), said received signal (yo)and said pilot values (ap) by removal of pilot- induced interference. ® KIPO & WIPO 2007