在频率选择性相关信道中的空频分组编码技术

本文提出了频率选择性瑞利衰落信道中的对角空频分组码(DSF)，研究了码的性能。分析表明，在各天线对间的信道相互独立，系统有NT个发射天线，NR个接收天线和信道冲击响应长度是L时，DSF码可实现分集增益NRNTL。此外，相关的发射天线阵列会使DSF码分集增益下降，但是对码的性能影响不大，特别是在较长的多路径信道上。因此，DSF码对于相关的衰落信道显示出优越的鲁棒性能。最终仿真结果证实了本文的分析。

Space-frequency block coding technique over frequency selective correlated channels

In this paper, we propose a diagonal space-frequency (DSF) block codes over frequency-selective Rayleigh fading channels and study performance of the code. Analysis indicate that a diversity gain of NRNTL is obtained under the assumption that the subchannels between antenna pairs fade independently, when we have NR receive antennas, NT the transmit antennas and channel impulse response length of L. We also note that spatial fading correlations at the transmit array can result in degraded diversity gain of the code, but performance of the DSF code is less affected by transmit correlation, over longer multipath channels in particular. Therefore, the DSF codes exhibit superior robustness with respect to correlated fading channels. Our theoretical results are confirmed by simulations.