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中文摘要：
本文研究多带正交频分复用瑞利衰落信道中,空时网格编码发射天线间空间相关性的分集性能.空时网格编码将单个输出的编码符号转换成多个编码符号,并通过多个发射天线传输,在接收端,Viterbi优化软判决算法用于译码.我们分析了MB-OFDM系统在quasi-static和interleaved两种信道中相关空间衰落对误码率的影响.在空间相关性较小时,分集阶数能得到保持;而在空间相关性较大时,interleaved信道能保持分集阶数,quasi-static信道的分集阶数将减小.空时编码总体上对空间相关性表现出鲁棒性.
英文摘要：
Space-time trellis codes（STTC） in multiband orthogonal frequency division multiplexing（MB-OFDM） systems with Rayleigh fading channels is proposed and diversity performance with spatial correlation between the transmit antennas is analyzed.STTC converts the single output code symbol into several code symbols,which are to be transmitted simultaneously from multiple transmitter antennas.Viterbi optimal soft decision decoding algorithm is used at the receiver.We investigate both quasi-static and interleaved channels and demonstrate how the spatial fading correlation affects the performance over these two different MB-OFDM wireless channel models.Diversity order is preserved when the spatial correlation is small.While spatial correlation becomes larger,diversity order could maintain in interleaved channels but decrease in quasi-static channels.In general,the performance of space time codes is observed to be robust to spatial correlation.
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