中文摘要：

空时分组码（STBC）由于具有较高的分集增益和简单的编译方法，从而得到普遍关注。但是它只适于频率平坦信道，而实际的信道多为频率选择性信道。丈中将考虑两种适用于频率选择性信道的空时分组码系统方案：OFDM-STBC和SC／FDE-STBC方案，即考虑空时分组码与正交频分复用或单载波频域均衡结合。通过对OFDM-STBC和SC／FDE-STBC系统性能仿真结果的比较和分析，表明SC／FDE-STBC方案要优于OFDM-STBC方案。此外，文中也给出一些细致的仿真性能的观察。

英文摘要：

Space time block coding （STBC）, due to its high diversity gain and simple coding and decoding method, has aroused general concern. However, it can only be used in frequency flat fading channels although actual channels are mostly frequency selective fading. This paper is concerned with two system schemes with STBC： OFDM-STBC and SC/FDE-STBC, which are suitable for frequency selective fading channels. Namely, the combinations of STBC with OFDM or SC/FDE are considered. By comparing and analyzing simulation results for the performance of OFDM-STBC and SC/FDE-STBC systems, it is concluded that SC/FDE-STBC is superior to OFDM-STBC. In addition, some meticulous observations of simulation results are given.