Method and apparatus of system scheduler

An wireless communication system comprising:

• a base station including at least:
• a modulator to modulate a plurality of data bits according to OFDM scheme to provide two or more modulated symbols;
• an encoder operably coupled to the modulator to encode said two or more modulated symbols according to a space-time encoding scheme wherein the encoded symbols are to be transmitted by a first and second antennas wherein the first antenna is able to transmit one or more symbols and the second antenna is able to transmit one or more other symbols;
• and
• a receiver to receive from a first mobile station a first chain of data symbols transmitted by at least two antennas and having a first transmit diversity to receive from a second mobile station a second chain of data symbols transmitted by at least two antennas and having a second transmit diversity, wherein both first and second chains of data symbols are transmitted from the first and second mobile stations at the same time, are modulated according to an Orthogonal Frequency Division Multiplexing (OFDM) scheme and encoded by a space time block codes scheme.