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; 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.