Cyclic delay diversity and space coded-hybrid diversity transmitter

A method of transmitting data in an OFDM system, which method comprises the steps of:

• (1) using a diversity generator to receive and diversify OFDM transmit symbols, and output diversified OFDM symbol matrices (DOSM);
• (2) dividing DOSM symbols within each DOSM into at least two primary streams each comprising different DOSM symbols;
• (3) transforming each DOSM symbol from the frequency domain into the time domain, and outputting time domain OFDM symbols (TDOSs);
• (4) dividing at least one of said primary streams of TDOSs into at least two branches of identical TDOSs, each branch for supplying a respective spatial channel for transmission to a receiver;
• and
• (5) applying a cyclic time shift to a TDOS in at least one of said branches before transmission which cyclic time shift is performed modulo the length of said TDOS and is a multiple of a guard period of said OFDM transmission protocol.

A computer readable medium comprising computer executable instructions for causing a diversity transmitter to perform the method steps of:

• (1) using a diversity generator to receive and diversify OFDM transmit symbols, and output diversified OFDM symbol matrices (DOSM);
• (2) dividing DOSM symbols within each DOSM into at least two primary streams each comprising different DOSM symbols;
• (3) transforming each DOSM symbol from the frequency domain into the time domain, and outputting time domain OFDM symbols (TDOSs);
• (4) dividing at least one of said primary streams of TDOSs into at least two branches of identical TDOSs, each branch for supplying a respective spatial channel for transmission to a receiver;
• and
• (5) applying a cyclic time shift to a TDOS in at least one of said branches before transmission, which cyclic time shift is performed modulo the length of said TDOS and is a multiple of a guard period of said OFDM transmission protocol.