【摘要】 针对基于正交频分复用实现的多输入多输出系统模型进行研究。首先，通过对低密度奇偶校验码的优越的纠错性能和空时网格编码技术的高传输性能的分析，提出将二者结合以改善OFDM MIMO系统信道的性能；然后，在OFDM MIMO系统的接收端采用最小均方误差均衡技术来分离传输符号；最后，给出所实现的OFDM MIMO无线链路通信系统模型。实验结果表明，与基于单一的LDPC或STTC的OFDM方案相比，提出的基于LDPC和STTC的组合方案不仅可以显著提高系统的误码率性能，同时具有更低的接收机复杂度和更灵活的可扩展性。更多还原

【Abstract】 The multi-input multi-output system model based on orthogonal frequency division multiplexing is studied. Firstly, through the analysis of the superior error-correcting performance of low density parity check codes and the high transmission performance of space-time trellis coding technology, it is proposed to combine the two codes to improve the channel performance of OFDM MIMO system. Then, the minimum mean square error equalization technique is used to separate the transmission symbols at the receiver of OFDM MIMO system. Finally, an OFDM MIMO wireless link communication system model is presented. The experimental results show that, compared with OFDM schemes based on a single LDPC or STTC,the bit error rate of the system could be improved significantly by the combined scheme based on LDPC and STTC,which has lower receiver complexity and more flexible scalability at the same time.更多还原