Patent ID: 8218613
Filing Date: 2012-07-10
Classification: H04L

Abstract:
1. A double-estimation channel estimator for calculating a plurality of accurate channel responses from a plurality of synchronization signals, comprising: a first channel estimator, for calculating a plurality of first channel responses at all time points over all sub-channels according to a plurality of pilot signals and the synchronization signals; a first equalizer, for calculating a plurality of first equalization signals at all the time points over all the sub-channels according to the first channel responses and the synchronization signals; a second channel estimator, for calculating a plurality of second responses at all the time points over all the sub-channels according to the first equalization signals and the synchronization signals; and a calculation module, for calculating a plurality of third channel responses at all the time points over all the sub-channels according to the first channel responses and the second channel responses, wherein the third responses are accurate channel responses; wherein the second channel estimator comprises: a first calculating unit, for calculating a plurality of fourth channel responses at all the time points in all the sub-channels according to the first equalization signals and the synchronization signals; a second calculating unit, for calculating a plurality of parameters at a specific time point over a specific sub-channel to be estimated according a first part of the fourth channel responses corresponding to the specific time point; and a third calculating unit, for calculating the second channel response at the specific time point over the specific sub-channel to be estimated according to a second part of the fourth channel responses corresponding to the specific time point and the parameters.