Method of determining the complex pulse response of a radio system

A method for determining a complex pulse response h of a radio channel in a digital mobile radio network, comprising the steps of:

• from a training sequence signal portion of a wanted signal for transmission via the radio channel, determining a matrix S of said signal portion at a transmitter end of the radio channel;
• storing, at a receiver end of the radio channel, the matrix S;
• transmitting the wanted signal from the transmitter end to the receiver end via the radio channel;
• at the receiver end of the radio channel determining a vector e that is representative of said signal portion of the wanted signal received at the receiver end;
• and
• calculating the pulse response by linear transformation in accordance with the following relationship:
• h=(S.sup.*T .multidot.S).sup.-1 .multidot.S.sup.*T .multidot.e
• where S.sup.*T is a transposed complex conjugate matrix of the matrix S stored at the receiver end.

A method for determining a complex pulse response h of a radio channel, comprising the steps of:

• from a selected signal portion of a wanted signal for transmission via the radio channel, determining a matrix S of said selected signal portion at a transmitter end of the radio channel;
• storing, at a receiver end of the radio channel, the matrix S;
• transmitting the wanted signal from the transmitter end to the receiver end via the radio channel;
• at a receiver end of the radio channel determining a vector e that is representative of said signal portion of the wanted signal received at the receiver end;
• and
• calculating the pulse response by linear transformation in accordance with the following relationship:
• h=(S.sup.*T .multidot.S+.alpha.E).sup.-1 .multidot.S.sup.*T .multidot.e
• where S.sup.*T is a transposed complex conjugate matrix of the matrix S stored at the receiver end, where .alpha. is a correction factor and where E is a diagonally dominant matrix.

A method for determining a complex pulse response h of a radio channel, comprising the steps of:

• from a selected signal portion of a wanted signal for transmission via the radio channel, determining a matrix S of said selected signal portion at a transmitter end of the radio channel from one of preset data of said selected signal portion and sample values obtained by sampling said selected signal portion;
• storing, at a receiver end of the radio channel, the matrix S;
• transmitting the wanted signal from the transmitter end to the receiver end via the radio channel;
• at a receiver end of the radio channel, determining the vector e of said selected signal portion of the wanted signal received at the receiver end by sampling said selected signal portion;
• and
• calculating the pulse response by linear transformation in accordance with the following relationship:
• h=s.sup.*T (S.multidot.S.sup.*T +N.sigma..sup.2 E).sup.-1 .multidot.e
• where S.sup.*T is a transposed complex conjugate matrix of the matrix S stored at the receiver end, N is the number of columns in the matrix S, .sigma. is a standard deviation of input noise and E is a diagonally dominant matrix.