System and method for multiple input multiple output wireless transmission

A method comprising:

• defining M disjoint subsets of an orthogonal code set, where M≧2 is a number of transmit antennas;
• for each of a plurality M sets of modulation symbols, each set associated with a respective encoded packet:
• a) defining M subsets of the set of modulation symbols;
• b) spreading each of the M subsets using a respective one of the M disjoint subsets to produce a respective spread signal component;
• for each antenna, generating a respective spread signal for the transmit antenna by combining together M spread signal components, the M spread signal components combined for the antenna including one of the spread signal components produced for each set of the M sets of modulation symbols, each of the M spread signal components combined for the antenna using a different one of the M disjoint subsets of the orthogonal code set;
• for each antenna, transmitting the respective spread signal;
• wherein the spread signals collectively include all of the spread signal components.

A system comprising:

• a) a transmitter comprising:
• M transmit antennas;
• signal spreading functions which for each of the plurality M of transmit antennas where M>=2, generate respective spread signal by:
• defining M disjoint subsets of an orthogonal code set;
• for each of a plurality of M sets of modulation symbols, each set associated with a respective encoded packet:
• i) defining M subsets of the set of modulation symbols;
• ii)spreading each of the M subsets using a respective one of the M disjoint subsets to produce a respective spread signal component;
• for each antenna, generating the respective spread signal for the transmit antenna by combining together M spread signal components, the M spread signal components combined for the antenna including one of the spread signal components produced for each set of the M sets of modulation symbols, each of the M spread signal components combined for the antenna using a different one of the M disjoint subsets of the orthogonal code set;
• for each antenna, transmitting the respective spread signal;
• wherein the spread signals collectively include all of the spread signal components;
• b) at least two receivers each comprising at least two receive antennas, each receiver being adapted to perform decoding and modulation of signals received from the transmitter to recover at least one respective packet.