中文摘要：

空时编码是一种结合信道编码和分集技术的新型的编码和信号处理方法，可以不需增加带宽而大幅度的提高无线通信系统的信道容量和传输速率，从而提供远高于传统单天线系统的频带利用率，空时分组码以其译码的简单性获得人们的广泛关注。为提高空时分组码的码元速率，在现有的空时分组编码方案的基础上，结合并行传输策略，提出了基于四天线的并行空时分组鳊码方案。与传统的空时分组编码方案相比，该方案能够在保证误码性能的同时提高码元速率，从而进一步提高了系统的性能。仿真结果验证了所提出的编码方案所具有的良好性能。

英文摘要：

Space-time coding is a new coding and signal processing method that combine the channel coding and diversity technique. It can greatly improve the information capacity and transmitting rate in wireless communication system, while the band need not be increased. So it can provide much higher spectrum efficiency than the conventional single antenna system. Space-time block code is paid more attention due to its low decoding complexity. In order to improve the code rate of space-time block code, combining parallel transmit strategy, a four antennas-based parallel space-time coding scheme based on the existing space-time block coding was proposed. Compared with the traditional schemes, the proposed scheme could ensure the performance of the coding, and furthermore, raise the code rate. So the performance of the system was improved. Simulation results verify the good performance of the proposed scheme.