Patent ID: 7593472

Claim:
A method of transmitting N.sub.OFDM input OFDM symbols in an OFDM-based MIMO system including M transmission antennas, wherein N.sub.OFDM≦M and wherein each of the M antennas has N.sub.SC subcarriers and each of the N.sub.OFDM input OFDM symbols has N.sub.SC QAM-mapped samples corresponding to the N.sub.SC subcarriers, the method comprising: forming M output OFDM symbols from the QAM-mapped samples of the N.sub.OFDM input OFDM symbols, wherein each of the M output OFDM symbols has N.sub.SC QAM-mapped samples corresponding to the N.sub.SC subcarriers and wherein each of the M output OFDM symbols includes a plurality of QAM-mapped samples from each of the N.sub.OFDM input OFDM symbols; forming N Pattern = ( M N OFDM ) = M ! N OFDM ! ⁢ ( M - N OFDM ! ) distinct combinations of N OFDM of the M output OFDM symbols; and forming a sequence of N SC elements wherein each element is one of the N Pattern distinct combinations and assigning a combination pattern to the subcarrier according to the sequence designated as P(s)=[floor(s/N pattern )+(s mod N Pattern )] mod N pattern wherein s =0, 1, 2, . . . , N SC −1 is the subcarrier number.