Patent ID: 7903753

Claim:
A system having multiple transmit antennas, comprising: a transmitter configured to transmit a plurality of data symbols to a receiver according to a space-time code including a code word matrix, wherein the transmitter is configured to transmit an amount of data symbols corresponding to a product of the number of transmit antennas and a spatial multiplexing rate during one code block period, a row index of the code word matrix indicating combined signals transmitted through different transmit antennas and a column index of the code word matrix indicating time slots; and wherein the average number of data symbols allocated to each transmit antenna at every time slot is equal to the spatial multiplexing rate, the data symbols allocated to each transmit antenna at every time slot are combined together using a set of combining coefficients and transmitted through the corresponding transmit antenna, and each transmit antenna transmits a different set of data symbols from a time slot to another, the set of combining coefficients that combines the data symbols allocated to each transmit antenna to be different for each time slot.