Patent Document ID: 6064703
Application ID: 08901981
Patent Flag: 1

Claim One:
1. Receiver of digital signals propagated in a mobile radio communication channel having multiple paths of the varying time type which give rise to distortions in time and frequency with uncertain characteristics having Rayleigh distribution and characterized by: a predictor circuit which, starting from filtered estimates, predicted estimates x (i-1/i-1) and G (i-1/i-1) calculates estimates x (i/i-1) and G (i/i-1) of an a posteriori probability x(i) and of a channel G(i) at time i, based on observation of the received sequence y(i) up to time i-1; a first calculation block which, starting from the above mentioned estimate x (i/i-1), calculates a co-variance matrix of an error estimate Sx(i/i-1) associated with x (i/i-1); a second calculation block which, starting from a co-variance matrix of a filtering error of G(i) S.sub.G (i-1/i-1), available at time i-1, calculates a co-variance matrix of an error estimate S.sub.G (i/i-1) associated with G (i/i-1); a third calculation block which calculates a gain vector K(i) of a Kalman algorithm starting from the above mentioned values calculated previously x (i/i-1), G (i/i-1), S.sub.G (i-1) and S.sub.X (i/i-1); a fourth calculation block which calculates a co-variance matrix of a channel filtering error S.sub.G (i/i) starting from the above mentioned values S.sub.G (i/i-1), x (i/i-1) and x (i-1/i-1); a fifth calculation block which calculates, starting from x (i/1) and with predetermined delay D, the a posteriori probabilities P(a(i-D)) of possible symbols transmitted; and a sixth block which performs a final estimate symbol by symbol a (i-D) seeking the maximum of the a posteriori probabilities of a(i-D), a(i-D) being the sequence of symbols determined by the receiver of digital signals, which the receiver of digital signals considers the sequence of transmitted symbols.