•Space time block coding with direct map
–Transmit antenna number is equal to the number of space-time streams
–Utilize identity mapping matrix, i.e. each space-time stream maps to one transmit antenna
•Space time block coding with spatial spreading
–The number of space-time streams is less than the number of transmit antennas
–Utilize typical Walsh matrix as well as basic MIMO does
–Utilize cyclic delay as well as basic MIMO does
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