Patent ID: 7428276
Filing Date: 2008-09-23
Classification: H04L

Abstract:
1. A method for estimating channel impulse response (CIR) in a communication system, the method comprising: (a) converting received RF analog signals to obtain baseband digitized signals, sampling the baseband digitized signals over a time according to a symbol period or a bit period, and cross-correlating at least part of the samples and a predetermined set of training sequence symbols; (b) calculating a ratio of a maximum value and a second largest value among squares of a modulus of outputs of the cross-correlations if there are a plurality of peak values among the outputs of the cross-correlation; and (c) if the ratio is larger than a first value, outputting the cross-correlation values as the CIR according to a time step index of which the cross-correlation is the maximum value and an adjacent time step indices.