Patent ID: 6603823
Filing Date: 2003-08-05
Classification: H04B,H04L

Abstract:
A channel estimator to operate on at least one received signal, the channel estimator comprising:a symbol probability generator to generate a priori probabilities only of transmitted symbols found in said at least one received signal; a noise variance estimator to estimate at least one noise variance corrupting said at least one received signal; a channel tap estimator to generate channel estimates from said at least one received signal, said a priori probabilities and said at least one noise variance; and wherein said channel tap estimator is able to solve the following equation: hML=12&it;T&CenterDot;&Sum;t=1T&it;â€ƒ&it;y_&af;(t)&CenterDot;z&af;(t;hML)*where {overscore (y)}(t) is a vector of downconverted and demodulated received signal of said at least one received signal, t is the time variable, hML is a ML channel estimator where ML denotes Maximum Likelihood, T is the sampling time, z(t;hML) is a mathematical scalar process, and (Â·)* denotes the conjugate of the bracketed expression.