Abstract: For broadband wireless communication systems with 4 transmitting antennas, a two-stream multiplexed space-time block-coding scheme is proposed.Each stream employs two transmitting antennas and adopts full-rate orthogonal space-time block coding.The proposed coding scheme achieves a code rate of 2 and requires the channels to be stationary over only two consecutive blocks.Two antennas are needed at the receiver to separate the two space-time block coded streams.Interference cancellation and frequency-domain equalization at the receiver have low complexity while offering full transmission diversity gain for both streams.

Key words: space-time block coding (STBC), transmit diversity, single-carrier frequency-domain equalization (SC-FDE), interference cancellation