动态频谱接入中的侦测与避让技术

doi:10.3969/j.issn.1000-0801.2010.03.011

摘要/Abstract

摘要：

动态频谱接入技术对频谱实行动态管理，允许未授权用户在无干扰的情况下使用已授权用户的闲置频带，是解决现今无线频谱资源紧缺和利用率低等难题的有效途径，已成为无线通信领域的研究热点。本文介绍了动态频谱接入的侦测与避让方法，分析和讨论了各自的优缺点，并指出动态频谱接入需要进一步研究的问题和可能的发展方向。

关键词: 认知无线电, 动态频谱接入, 侦测, 避让

Abstract:

Due to efficiently solve spectrum resource shortage and low spectrum utilization rate problems,dynamic spectrum access has become a research focus.It can allow the unlicensed users to dynamically share the spectrum that is not used by the primary licensed users without interference by means of dynamic radio frequency spectrum management policy.This paper presents a comprehensive survey on the detecting and avoiding technology of dynamic spectrum access.Their primary virtues and deficiencies are also analyzed and discussed.Some problems worthy of further study and probably developing trends in the dynamic spectrum access field are presented.

Key words: congnitive radio, dynamic spectrum access, detect, avoid

时颖,林茂六. 动态频谱接入中的侦测与避让技术[J]. 电信科学, 2010, 26(3): 35-40.

Ying Shi,Maoliu Lin. A Survey of Detect and Avoid Technology of Dynamic Spectrum Access[J]. Telecommunications Science, 2010, 26(3): 35-40.

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方法名称	优点	缺点
匹配滤波器	检测时间短，增益大	用户必须知道每一类授权用户的先验信息
能量检测器	准确度较高	判决门限较难确定，不适合弱信号检测
循环平稳检测法	检测性能好，能识别各类调制信号，适用于扩频信号检测	检测时间长，复杂度较高

方法名称	优点	缺点
频带释放法	简单，有足够的衰减	频带利用率低，只限制在跳频制式中使用
子载波空闲法	简单，任意数目的子载波空闲，保护窗的带宽范围为4～100 MHz	只有-20～-15 dB衰减
子载波空闲法+时域窗法	能成功得到-25 dB 的保护电平	大量的空闲间隔破坏了传输标准，实际中至少需要-28 dB衰减
子载波对消法	能得到超过-30 dB 的保护电平	计算量大
陷波滤波器法	能得到超过-30 dB 的保护电平，易用硬件实现	计算量大

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