Method of determining the complex pulse response of a radio system

Claim 1

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 the receiver end of the radio channel determining a 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).sup.-1 ·S.sup.*T ·e where S *T is a transposed complex conjugate matrix of the matrix S stored at the receiver end.

Claim 2

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 the receiver end of the radio channel determining a 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).sup.-1 ·S.sup.*T ·e where S *T is a transposed complex conjugate matrix of the matrix S stored at the receiver end.

Claim 7

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 ·S).sup.-1 ·S.sup.*T ·e where S *T is a transposed complex conjugate matrix of the matrix S stored at the receiver end.

Claim 8

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 ·S).sup.-1 ·S.sup.*T ·e where S *T is a transposed complex conjugate matrix of the matrix S stored at the receiver end.

Claim 13

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 ·S+αE).sup.-1 ·S.sup.*T ·e where S *T is a transposed complex conjugate matrix of the matrix S stored at the receiver end, where α is a correction factor and where E is a diagonally dominant matrix.

Claim 14

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 ·S+αE).sup.-1 ·S.sup.*T ·e where S *T is a transposed complex conjugate matrix of the matrix S stored at the receiver end, where α is a correction factor and where E is a diagonally dominant matrix.

Claim 19

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·S.sup.*T +Nσ.sup.2 E).sup.-1 ·e where S *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, σ is a standard deviation of input noise and E is a diagonally dominant matrix.

Claim 20

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·S.sup.*T +Nσ.sup.2 E).sup.-1 ·e where S *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, σ is a standard deviation of input noise and E is a diagonally dominant matrix.