Time-domain transmit and receive processing with channel eigen-mode decomposition for MIMO systems

A method for transmitting data in a multiple-input multiple-output MIMO communication system, comprising;

• providing a plurality of streams of modulation symbols;
• deriving a pulse-shaping matrix based in part on an estimated response of a MIMO channel;
• determining an estimated channel response matrix for the MIMO channel;
• and decomposing the estimated channel response matrix to obtain a first sequence of matrices of eigen-vectors and a second sequence of matrices of singular values, wherein the pulse-shaping matrix is derived based on the first and second sequences of matrices;
• pulse shaping the plurality of modulation symbol streams based on the pulse-shaping matrix to derive a plurality of pulse-shaped signals;
• and
• transmitting the plurality of pulse-shaped signals over the MIMO channel,
• wherein the pulse-shaping matrix comprises a plurality of sequences of time-domain values, and wherein the pulse-shaping is performed in the time domain by convolving the plurality of streams of modulation symbols with the pulse-shaping matrix.

A method for transmitting data in a multiple-input multiple-output (MIMO) communication system, comprising:

• providing a pluralitv of streams of modulatiqn symbols;
• deriving a pulse-shaing matrix based in on an estimated response of a MIMO channel;
• determining an estimated channel response matrix for the MIMO channel;
• and decomposing the estimated channel response matrix to obtain a first sequence of matrices of eigen-vectors and a second sequence of matrices of singular values, wherein the pulse-shaping matrix is derived based on the first and second sequences of matrices;
• pulse shaping the plurality of modulation symbol streams based on the pulse-shaping matrix to derive a plurality of pulse-shaped signals;
• and
• transmitting the plurality of pulse-shaped signals over the MIMO channel,
• wherein the pulse-shaping matrix comprises a plurality of sequences of frequency-domain values, and wherein the pulse shaping is performed in the frequency domain by multiplying a plurality of streams of transformed modulation symbols with the pulse-shaping matrix.

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

• a TX data processor operative to code data in accordance with one or more coding schemes to provide coded data for a plurality of transmission channels in a MIMO channel, and to modulate the coded data in accordance with one or more modulation schemes to provide a plurality of streams of modulation symbols;
• a TX MIMO processor operative to derive a pulse-shaping matrix based in part on an estimated response of the MIMO channel, and to pulse shape the plurality of modulation symbol streams based on the pulse-shaping matrix to provide a plurality of pulse-shaped signals;
• and
• one or more transmitters operative to condition and transmit the plurality of pulse-shaped signals over the MIMO channel wherein the TX MIMO processor is further operative to determine an estimated channel response matrix for the MIMO channel, decompose the estimated channel response matrix to obtain a first sequence of matrices of eigen-vectors and a second sequence of matrices of singular values, and derive the pulse-shaping matrix based on the first and second sequences of matrices.