Signal processing with channel eigenmode decomposition and channel inversion for MIMO systems

In a multiple-input multiple-output (MIMO) communication system, a method for processing data for transmission over a MIMO channel, comprising:

• processing data in accordance with a particular processing scheme to provide a plurality of streams of modulation symbols;
• obtaining an estimated channel response matrix for the MIMO channel;
• decomposing the estimated channel response matrix to obtain a plurality of matrices of eigen-vectors and a plurality of matrices of singular values;
• deriving a plurality of weights based on the matrices of singular values, wherein the weights are used to invert the frequency response of the MIMO channel;
• deriving a plurality of scaling values based on the matrices of singular values, wherein the scaling values are used to adjust transmit powers for eigenmodes of the MIMO channel;
• deriving a pulse-shaping matrix based on the matrices of eigen-vectors the plurality of scaling values, and the weights, wherein the pulse-shaping matrix comprises a plurality of sequences of time-domain values;
• and
• preconditioning, according to at least a convolution operation, the plurality of streams of modulation symbols in the time domain, based on the pulse-shaping matrix to provide a plurality of streams of preconditioned symbols for transmission over the MIMO channel.

A computer readable media memory storing instructions to be executed by a digital signal processing device (DSPD) capable of interpreting the instructions to perform the steps of:

• processing data in accordance with a particular processing scheme to provide a plurality of streams of modulation symbols;
• deriving a pulse-shaping matrix based on an estimated channel response matrix of the MIMO channel and a plurality of transmit power scaling values, which are based on a plurality of matrices of singular values, wherein the pulse-shaping matrix comprises a plurality of sequences of time-domain values;
• and
• precondition, according to at least a convolution operation, the plurality of streams of modulation symbols in the time domain, based on the pulse-shaping matrix to provide a plurality of streams of preconditioned symbols for transmission over the MIMO channel.

In a multiple-input multiple-output (MIMO) communication system, a method for processing a data transmission received via a MIMO channel, comprising:

• obtaining an estimated channel response matrix for the MIMO channel;
• decomposing the estimated channel response matrix to obtain a plurality of matrices of eigen-vectors;
• deriving a time domain pulse-shaping matrix based on the matrices of eigen-vectors;
• and
• conditioning, according to at least a convolution operation in the time domain, a plurality of streams of received symbols, based on the time domain pulse-shaping matrix to provide a plurality of streams of recovered symbols which are estimates of preconditioned modulation symbols transmitted for the data transmission,
• wherein the preconditioned modulation symbols are preconditioned at a transmitter prior to transmission over the MIMO channel, and are based on a plurality of scaling values used to adjust transmit power for the MIMO channel, and wherein the plurality of scaling values are based on a plurality of matrices of singular values.

In a multiple-input multiple-output (MIMO) communication system, a method for processing a data transmission received via a MIMO channel, comprising:

• obtaining an estimated channel response matrix for the MIMO channel;
• decomposing the estimated channel response matrix to obtain a plurality of matrices of eigen-vectors;
• deriving a time domain pulse-shaping matrix based on the matrices of eigen-vectors;
• conditioning, according to at least a convolution operation in the time domain, a plurality of streams of received symbols, based on the time domain pulse-shaping matrix to provide a plurality of streams of recovered symbols which are estimates of preconditioned modulation symbols transmitted for the data transmission,
• wherein the preconditioned modulation symbols are preconditioned at a transmitter prior to transmission over the MIMO channel, and are based on a plurality of scaling values used to adjust transmit power for the MIMO channel, and wherein the plurality of scaling values are based on a plurality of matrices of singular values;
• demodulating the plurality of recovered symbol streams in accordance with one or more demodulation schemes to provide a plurality of demodulated data streams;
• and
• decoding the plurality of demodulated data streams in accordance with one or more decoding schemes to provide decoded data.

A computer readable media memory storing instructions to be executed by a digital signal processing device (DSPD) capable of interpreting the instructions to perform the steps of:

• obtaining an estimated channel response matrix for a multiple-input multiple output (MIMO) channel used for a data transmission;
• decomposing the estimated channel response matrix to obtain a plurality of matrices of eigen-vectors;
• deriving a time domain pulse-shaping matrix based on the matrices of eigen-vectors;
• and
• conditioning, according to at least a convolution operation in the time domain, a plurality of streams of received symbols, based on the time domain pulse-shaping matrix to provide a plurality of streams of recovered symbols which are estimates of preconditioned modulation symbols transmitted for the data transmission,
• wherein the preconditioned modulation symbols are preconditioned at a transmitter prior to transmission over the MIMO channel, and are based on a plurality of scaling values used to adjust transmit power for the MIMO channel, and wherein the plurality of scaling values are based on a plurality of matrices of singular values.

A transmitter unit in a multiple-input multiple-output (MIMO) communication system, comprising:

• a transmit (TX) data processor operative to process data in accordance with a particular processing scheme to provide a plurality of streams of modulation symbols;
• and
• a TX MIMO processor operative to derive a pulse-shaping matrix based on an estimated response of a MIMO channel, and to precondition, according to at least a convolution operation, the plurality of modulation symbol streams, based on the pulse-shaping matrix and on a plurality of scaling values used to adjust transmit power for the MIMO channel, which are based on a plurality of matrices of singular values, and to provide a plurality of streams of preconditioned symbols for transmission over the MIMO channel,
• wherein the pulse-shaping matrix comprises a plurality of sequences of time-domain values, and
• wherein the preconditioning is performed in the time domain by convolving the streams of modulation symbols with the pulse-shaping matrix.

An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:

• means for processing data in accordance with a particular processing scheme to provide a plurality of streams of modulation symbols;
• means for deriving a pulse-shaping matrix based on an estimated channel response matrix of a MIMO channel and a plurality of scaling values used to adjust transmit rower for the MIMO channel, which are based on a plurality of matrices of singular values, wherein the pulse-shaping matrix comprises a plurality of sequences of time-domain values;
• and
• means for preconditioning, according to at least a convolution operation, the plurality of modulation symbol streams in the time domain, based on the pulse-shaping matrix to provide a plurality of streams of preconditioned symbols for transmission over the MIMO channel.

A digital signal processor comprising:

• means for processing data in accordance with a particular processing scheme to provide a plurality of streams of modulation symbols;
• means for deriving a pulse-shaping matrix based on an estimated channel response matrix of a MIMO channel and a plurality of scaling values used to adjust transmit rower for the MIMO channel, which are based on a plurality of matrices of singular values, wherein the pulse-shaping matrix comprises a plurality of sequences of time-domain values;
• and
• means for preconditioning, according to at least a convolution operation, the plurality of modulation symbol streams in the time domain, based on the pulse-shaping matrix to provide a plurality of streams of preconditioned symbols for transmission over the MIMO channel.

An apparatus in a multiple-input multiple-output (MIMO) communication system, comprising:

• means for obtaining an estimated channel response matrix for a MIMO channel used for a data transmission;
• means for decomposing the estimated channel response matrix to obtain a plurality of matrices of eigen-vectors;
• means for deriving a time domain pulse-shaping matrix based on the matrices of eigen-vectors;
• and
• means for conditioning, according to at least a convolution operation in the time domain, a plurality of streams of received symbols, based on the time domain pulse-shaping matrix, to provide a plurality of streams of recovered symbols which are estimates of preconditioned modulation symbols transmitted for the data transmission,
• wherein the preconditioned modulation symbols are preconditioned at a transmitter prior to transmission over the MIMO channel, and are based on a plurality of scaling values used to adjust transmit power for the MIMO channel, and wherein the plurality of scaling values are based on a plurality of matrices of singular values.

A digital signal processor comprising:

• means for obtaining an estimated channel response matrix for a multiple-input multiple-output (MIMO) channel used for a data transmission;
• means for decomposing the estimated channel response matrix to obtain a plurality of matrices of eigen-vectors;
• means for deriving a time domain pulse-shaping matrix based on the matrices of eigen-vectors;
• and
• means for conditioning, according to at least a convolution operation in the time domain, a plurality of streams of received symbols, based on the time domain pulse-shaping matrix, to provide a plurality of streams of recovered symbols which are estimates of preconditioned modulation symbols transmitted for the data transmission,
• wherein the preconditioned modulation symbols are preconditioned at a transmitter prior to transmission over the MIMO channel, and are based on a plurality of scaling values used to adjust transmit power for the MIMO channel, and wherein the plurality of scaling values are based on a plurality of matrices of singular values.