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Documents 基于认知无线电的超宽带系统兼容性分析与研究
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  • Author Author: sophie0love
  • Date Created: 23 Nov 2010 2:56 PM Date Created
  • Last Updated Last Updated: 9 Nov 2021 4:52 PM
  • Views 354 views
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基于认知无线电的超宽带系统兼容性分析与研究

超宽带(Ultra-Wideband)通信技术性能优良,具有广阔的应用前景,受到越来越多的关注。UWB通信系统的信号在频域上范围极宽,实现UWB通信系统与其他现有通信系统的兼容是使UWB技术得到广泛应用的首要前提。 认知无线电技术是近来无线通信中的新热点。它可以感知到周围的环境,从而智能地改变和调整通信机制,高效地使用无线资源,缓解目前频谱短缺的现状。随着认知无线电概念的提出,解决兼容性问题有了新的思路。 本文首先搭建了超宽带系统平台,通过这样的平台对超宽带系统的性能进行分析和研究。接着仿真分析了UWB系统与WLAN系统共存时的相互干扰情况。如果UWB系统能够通过自身的优化尽可能的减少对共存授权系统(如WLAN系统)的影响,将为其日后的发展带来很大的益处。 超宽带技术和认知无线电技术的核心思想都是无害地共享可用的频谱资源。虽然它们共享频谱及与其它系统共存的方式不同,但都极大地提高了频谱利用率。本文在上述仿真分析的基础上,对基于认知无线电技术的超宽带系统进行了探讨,给出了基于认知无线电技术的超宽带系统的设计框架和主要的功能模块设计,描述了系统的工作流程,提出了系统的核心频谱分配算法,并进行了仿真分析,为解决频谱资源不足、实现频谱动态管理及提高频谱利用率提供了新的思路。最后对其研究前景进行了展望。

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