Method and system for increased bandwidth efficiency in multiple input - multiple output channels

A method comprising steps of:

• supplying an input bit stream to a trellis code block;
• modulating an output of said trellis code block so as to provide a first modulation symbol sequence;
• diversity encoding said first modulation symbol sequence so as to generate a second modulation symbol sequence;
• feeding said second modulation symbol sequence to a plurality of Walsh covers, wherein each of said plurality of Walsh covers outputs one of a plurality of spread sequences of output chips;
• transmitting said plurality of spread sequences of output chips over a channel.

A system comprising:

• a trellis code block configured to encode an input bit stream;
• a modulator configured to receive an output of said trellis code block to provide a modulation symbol sequence;
• a plurality of Walsh covers, wherein said modulation symbol sequence is fed to said plurality of Walsh covers and each of said plurality of Walsh covers outputs one of a plurality of spread sequences of output chips;
• said system configured to transmit said plurality of spread sequences of output chips over a channel.

A system comprising:

• a trellis code block configured to encode an input bit stream;
• a modulator configured to receive an output of said trellis code block to provide a first modulation symbol sequence;
• an Alamouti block configured to diversity encode said first modulation symbol sequence so as to generate a second modulation symbol sequence;
• a plurality of Walsh covers, wherein said second modulation symbol sequence is fed to said plurality of Walsh covers and each of said plurality of Walsh covers outputs one of a plurality of spread sequences of output chips;
• said system configured to transmit said plurality of spread sequences of output chips over a channel.