Method and device for multi-user channel estimation

A method of operating a communication system including at least one receiver and at least one transmitter comprising:

• computing a frequency-interpolation matrix as a function of auxiliary frequency-domain channel gains variables, a set of time domain channel gains variables, and a predefined set of auxiliary weighting coefficients;
• computing a final weighting matrix as a function of a provided primary weighting matrix, and the frequency-interpolation matrix;
• receiving a plurality of training sequences from at least one antenna;
• assembling a matrix of received training data from the training sequences;
• computing a plurality of time-domain channel gains for each transmitter as a product of the final weighting matrix and the received data matrix;
• computing a frequency-domain channel gains by taking a DFT of the time-domain channel gains;
• and
• passing each frequency-domain channel gains to the receiver to recover a plurality of transmitted data symbols.

A method of operating a communication system including at least one receiver and at least one transmitter comprising:

• computing a time-interpolation matrix as a function of auxiliary time-domain channel gains variables, a set of Doppler channel gains variables, and a predefined set of Doppler weighting coefficients;
• computing a Doppler gain matrix as a function of a provided primary weighting matrix, and the time-interpolation matrix;
• receiving training sequences from at least one antenna;
• assembling a matrix of received training data from the training sequences;
• computing a plurality of Doppler channel gains as a function of the Doppler gain matrix and the matrix of received training data;
• computing a plurality of time-domain channel gains as a function of the Doppler channel gains;
• computing a frequency-domain channel gains by taking a DFT of the time-domain channel gains;
• and
• passing each frequency-domain channel gains to the receiver to recover a plurality of transmitted data symbols.

A receiver for a wireless communication system comprising:

• means for computing a plurality of weighting coefficients as a function of time and frequency correlation functions, a noise correlation matrix, and pilot sequences;
• means for computing a weighting matrix from the weighting coefficients;
• means for receiving a training sequence from at least one transmitter;
• means for computing a received data matrix from the training sequence;
• and
• means for computing from the weighting matrix, and the received data matrix estimated channel gains wherein the estimated channel gains Hj(kd,bd) are computed as a function of ΣY(fp,tp,)qj(d,fp,tp).

A receiver for a wireless communication system comprising:

• means for computing a frequency-interpolation matrix as a function of auxiliary frequency-domain channel gains variables, a set of time domain channel gains variables, and a predefined set of auxiliary weighting coefficients;
• means for computing a final weighting matrix as a function of a provided primary weighting matrix, and the frequency-interpolation matrix;
• means for receiving a plurality of training sequences from at least one antenna;
• means for assembling a matrix of received training data from the training sequences;
• means for computing a plurality of time-domain channel gains for each transmitter as a product of the final weighting matrix and the received data matrix;
• and
• means for computing a frequency-domain channel gains by taking a DFT of the time-domain channel gains.

A receiver for a wireless communication system comprising:

• means for computing a time-interpolation matrix as a function of auxiliary time-domain channel gains variables, a set of Doppler channel gains variables, and a predefined set of Doppler weighting coefficients;
• means for computing a Doppler gain matrix as a function of a provided primary weighting matrix, and the time-interpolation matrix;
• means for receiving training sequences from at least one antenna;
• means for assembling a matrix of received training data from the training sequences;
• means for computing a plurality of Doppler channel gains as a function of the Doppler gain matrix and the matrix of received training data;
• means for computing a plurality of time-domain channel gains as a function of the Doppler channel gains;
• and
• means for computing a frequency-domain channel gains by taking a DFT of the time-domain channel gains.

A computer readable medium storing a computer program comprising:

• computer readable program code for computing a frequency-interpolation matrix as a function of auxiliary frequency-domain channel gains variables, a set of time domain channel gains variables, and a predefined set of auxiliary weighting coefficients;
• computer readable program code for computing a final weighting matrix as a function of a provided primary weighting matrix, and the frequency-interpolation matrix;
• computer readable program code for receiving a plurality of training sequences from at least one antenna;
• computer readable program code for assembling a matrix of received training data from the training sequences;
• computer readable program code for computing a plurality of time-domain channel gains for each transmitter as a product of the final weighting matrix and the received data matrix;
• and
• computer readable program code for computing a frequency-domain channel gains by taking a DFT of the time-domain channel gains.

A computer readable medium storing a computer program comprising:

• computer readable code for computing a time-interpolation matrix as a function of auxiliary time-domain channel gains variables, a set of Doppler channel gains variables, and a predefined set of Doppler weighting coefficients;
• computer readable code for computing a Doppler gain matrix as a function of a provided primary weighting matrix, and the time-interpolation matrix;
• computer readable code for receiving training sequences from at least one antenna;
• computer readable code for assembling a matrix of received training data from the training sequences;
• computer readable code for computing a plurality of Doppler channel gains as a function of the Doppler gain matrix and the matrix of received training data;
• computer readable code for computing a plurality of time-domain channel gains as a function of the Doppler channel gains;
• and
• computer readable code for computing a frequency-domain channel gains by taking a DFT of the time-domain channel gains.