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Documents 空时编码及其应用于空时协作通信技术仿真研究
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  • Author Author: sophie0love
  • Date Created: 21 Nov 2010 1:34 AM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:49 PM
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空时编码及其应用于空时协作通信技术仿真研究

多输入多输出技术(MIMO)通过在发送端和接收端安装多天线,充分开发利用空间资源,通过多个天线实现多发多收,在不需要增加频谱资源和天线发送功率的情况下,可以成倍地提高信道容量。空时编码技术是关键的MIMO信号处理技术,它的最大特点是将编码技术和多元天线阵列技术有机地结合在一起,通过时间域和空间域的联合编码,实现一定的分集增益和编码增益,提高了MIMO技术的实用性。 在实际无线通信环境,尤其是分布式通信环境中,通信网络中的节点由于自身条件的限制很难配置多天线来构成MIMO所需要的多天线阵列,协作通信技术的出现很好地解决了这一问题。协作通信通过利用无线通信网络的广播特性,各协作节点共享它们的天线和其它资源,通过不同的协作方式以及相应的信号处理方法来传递各自或中继他人的信息,达到一种虚拟的多天线效果,从而利用MIMO技术实现数据高速可靠地传输。 本文在简要介绍MIMO技术、空时编码技术和协作通信技术的发展和研究现状后,重点对正交空时分组编码(OSTBC)、网格空时编码(STTC)和垂直贝尔实验室分层空时编码(VBLAST)技术进行了研究,完成了三种空时编码方案的仿真平台,通过大量的仿真,系统地验证和比较了在不同条件下三种空时编码方案的性能。 研究结果表明,三种空时编码方案各有优势,适合应用于不同的通信环境和条件。之后,本文对基于空时编码的协作通信技术进行了研究,将前文所研究的正交空时分组编码方案和网格空时编码方案应用于协作通信环境,完成了基于以上两种空时编码方案的放大转发模式(AF)、译码转发模式(DF)以及多中继和多跳协作通信模型的建模和仿真平台的搭建,对基于不同空时编码方案的空时协作通信系统进行分析和比较。研究结果表明,虽然OSTBC方案本身性能略逊于STTC方案,但是它具有实现简单、译码复杂度低、使用灵活等优点,对协作通信系统性能提升幅度明显,有着广阔的应用前景。

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