Patent ID: 7995691
Filing Date: 2011-08-09
Classification: H04H,H04L

Abstract:
1. A real-time channel estimation system, which receives a wireless transmission signal through a wireless channel and estimates channel parameters of the wireless channel in real-time, the system comprising: a channel estimator, which receives the wireless transmission signal to accordingly estimate and output the channel parameters of the wireless channel; a first filter, which is connected to the channel estimator in order to filter the channel parameters and produce a first set of filtered channel parameters; a second filter, which is connected to the channel estimator in order to filter the channel parameter and produce a second set of filtered channel parameters, wherein the first filter is associated with a static channel and the second filter is associated with a dynamic channel and the first filter has a bandwidth smaller than the second filter; a first calculator, which is connected to the first filter in order to compute according to the first set of filtered channel parameters and the wireless transmission signal to thereby produce a first probability; a second calculator, which is connected to the second filter in order to compute according to the second set of filtered channel parameters and the wireless transmission signal to thereby produce a second probability; a comparator, for comparing the first probability and the second probability to thereby produce an indicative signal; and a multiplexer, which is connected to the first filter, the second filter and the comparator, in order to receive the indicative signal and accordingly select the first or second set of filtered channel parameters as an output; wherein the wireless transmission signal comprises a pilot signal and a noise and the wireless transmission signal, the pilot signal and the noise form a relation of: where Y(f) indicates the wireless transmission signal in frequency domain, S(f) indicates the pilot signal in frequency domain, N(f) indicates the noise in frequency domain, and H(f) indicates the channel parameters of the wireless channel in frequency domain; wherein the first probability is expressed as: where y indicates the wireless transmission signal, H