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中文摘要：
采用迭代检测译码接收方法的LDPC（low density parity check,低密度奇偶校验）编码MIMO-OFDM（multiple-input multiple-output orthogonal frequency division multiplexing,多天线正交频分复用）传输,是在宽带无线通信系统中逼近多输入多输出（MIMO）信道容量的一种简单而有效的方法.在迭代检测译码过程中,既存在检测器和译码器之间的迭代,也存在译码器内迭代.首先给出LDPC编码MIMO-OFDM系统的因子图分析,进而提出双涡轮迭代检测译码方法.在所提方法中,检测器与译码器并发工作且实时交互软信息.与传统的串行迭代检测译码方法相比,双涡轮迭代检测译码方法可有效地降低检测译码时延.仿真结果证实,采用双涡轮迭代检测译码方法的接收机能在给定运算复杂度的条件下改善误帧率性能,有助于实现＂绿色通信＂.
英文摘要：
Low density parity check（LDPC） coded multiple-input multiple-output orthogonal frequency division multiplexing（MIMO-OFDM） systems,combined with iterative detection and decoding receivers,are simple and efficient methods for approaching the capacity of MIMO channels in broadband wireless communication systems.In iterative detection and receivers,soft messages should be passed not only between the MIMO detector and the LDPC decoder,but also between the two steps of LDPC decoding.The factor graph of MIMO-OFDM systems is derived and then dual-turbo receivers are proposed,where the MIMO detector and the iterative decoder work concurrently and soft messages are exchanged between them in real time.Compared with the sequential iterative detection and decoding receivers,dual-turbo receivers have lower latency and converge faster.Simulation results show that dual-turbo detection and decoding receivers greatly reduce the SNR required to achieve certain frame error rate（FER） with determined computational complexity,which is beneficial to green communications.
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