文中研究了MIMO-OFDM系统中的空时分组编码,并在此系统的基础上与Turbo码进行级联,从而使系统具有分集和抗多径衰落的性能。为了更进一步的减少系统误码率,文中对Turbo码的译码算法进行改进后,与MIMO-OFDM再进行级联。仿真结果表明,改进的Turbo码译码算法与其他译码算法相比,减少了误码率。这种级联后的系统比传统的MIMO系统的性能有较好的改善。 In this paper, space-time block coding in MIMO-OFDM system is studied, and based on this system, a turbo code is cascaded to make the system diversity and anti-multipath fading performance. In order to further reduce the system bit error rate, Turbo decoding algorithm in the paper is improved, and MIMO-OFDM further cascade. The simulation results show that the improved Turbo decoding algorithm reduces bit error rate compared with other decoding algorithms. This cascaded system has better performance than the traditional MIMO system.