Patent ID: 7551696
Filing Date: 2009-06-23
Classification: H04L

Abstract:
1. A method for detecting inter-symbol interference (ISI) and accordingly improving a timing of a detected boundary used for processing a plurality of different symbols, wherein the plurality of different symbols comprise a previous symbol, a current symbol and a following symbol and each of them is composed of a plurality of signals which are respectively transmitted via a plurality of sub-carriers in an OFDM system, the method comprising: utilizing a first correlator for computing a first correlation value according to a specific signal of the current symbol and a specific signal of the previous symbol, the step of computing the first correlation value comprising: utilizing a second correlator for computing a second correlation value according to the specific signal of the current symbol and a specific signal of the following symbol, wherein the specific signals of the previous, current and following symbols are transmitted via the same sub-carrier; utilizing a comparator for comparing the first correlation value with the second correlation value to determine whether the first correlation value is larger than the second correlation value; and utilizing a timing controller for delaying the timing of the detected boundary when the first correlation value is larger than the second correlation value due to the timing of the detected boundary being ahead of the timing of an ideal boundary, and advancing the timing of the detected boundary when the second correlation value is larger than the first correlation value due to the timing of the detected boundary lagging behind the timing of the ideal boundary.