Structure of a multi-input multi-output multicarrier code division multiple access communication system and communication method thereof

A structure of a multi-input multi-output multicarrier code division multiple access (MIMO MC-CDMA) communication system comprising at least one transmitter and at least one receiver, the transmitter comprising:

• a de-multiplexer for receiving a user's data and outputting the data divided into a plurality of parallel data streams;
• a plurality of space time block encoders individually receiving the parallel data streams of the de-multiplexer and outputting the data streams after encoding;
• a plurality of space-path spreaders, at least one of said plurality of space-path spreaders individually receiving outputted data from at least one of said plurality of space time block encoders and outputting received data after spreading with different and orthogonal space-path spreading codes pre-designed to pre-suppress multiple access interference (MAI) and to pre-equalize multiple paths in the communication system,
• wherein a number of said at least one space-path spreaders in relationship to a number of said at least one space time block encoders is selected to adjust a diversity gain and transmission speed in said communication system;
• and
• a plurality of transmit antennas, each transmit antenna receiving outputted data from each said at least one space-path spreader and transmitting received data through the multiple paths.