一种用于频率选择性信道的高速率单载波空时分组码系统

xisting single-carrier(SC) orthogonal space-time block coding(STBC) schemes for frequency-selective channels are mostly developed for systems with two transmit antennas. In the case of four transmit antennas, the use of the orthogonal code matrix associated with four transmit antennas can not achieve full-rate transmission, and it requires the underlying channels to be invariant over the period of at least four consecutive transmitted blocks. In order to mitigate such limitations, we propose a two-stream multiplexed STBC scheme, where each stream employs two transmit antennas and adopts the full-rate orthogonal space-time block codes. The proposed coding scheme yields a code matrix of rate-2 and requires the channels to be constant over only two consecutive blocks. Two receive antennas are needed at the receiver to separate the two space-time block coded streams. Theoretical analysis indicates that the proposed scheme enables low-complexity interference cancellation and frequency-dom