Statistical characteristics of MIMO-OFDM transmission systems in a multipath environment where the delay spreading exceeds the guard interval
Statistical characteristics of MIMO-OFDM transmission systems in a multipath environment where the delay spreading exceeds the guard interval
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时延扩展超过保护间隔的多径环境下MIMO-OFDM传输系统的统计特性
DOI：
10.1002/ecja.20209
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Y. Karasawa
中科院分区：
文献类型：
--
作者：
X. Nguyen;T. Taniguchi;Y. Karasawa
正交频分复用（OFDM）调制系统可以通过提供比最大延迟长的保护间隔来完全防止由于多径传播引起的符号间干扰，在下文中我们称之为“延迟扩展”。另一方面，在延迟扩展超过保护间隔的环境中，发生符号间干扰。本文研究了一种MIMO-OFDM系统，在该系统中，将具有高分集增益的MIMO配置引入到OFDM调制方案中，并讨论了最大比合并传输（单流传输）的传输特性。结果表明，即使延迟扩展超过保护间隔，MIMO-OFDM系统也不会受到延迟引起的码间干扰的影响，并且可以获得良好的性能。它还表明，在实时控制所需的信道响应，可以估计有足够的精度。© 2005 Wiley Periodicals，Inc. Electron Comm Jpn Pt 1，88（12）：29-39，2005;在线发表于Wiley InterScience（www.interscience.wiley.com）。DOI 10.1002/ecja.20209
Orthogonal frequency division multiplex (OFDM) modulation systems can completely prevent intersymbol interference due to multipath propagation by providing a guard interval which is longer than the maximum delay hereafter we call “delay spreading.” In an environment in which the delay spreading exceeds the guard interval, on the other hand, intersymbol interference occurs. This study considers a MIMO-OFDM system in which a MIMO configuration with high diversity gain is introduced into the OFDM modulation scheme, and discusses the transmission characteristics of maximal ratio combining transmission (single-stream transmission). It is shown that the MIMO-OFDM system is less affected by intersymbol interference due to the delay, even if the delay spread exceeds the guard interval, and that good performance is achieved. It is also shown that the channel response which is required in real-time control can be estimated with sufficient accuracy. © 2005 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(12): 29–39, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20209