摘要： 通过感知、适应和学习周围的电磁环境,认知无线电能够发现特定频段的频率空洞,捕捉无线信号的特征,保证在不对主用户造成干扰的情况下,利用空闲频谱资源进行通信。但目前少有衡量频谱可靠性的研究。为此,基于能量检测法提出一种针对频道可靠性的频谱资源分析方法,联合考虑频谱可用性和稳定性2个因素作为频谱可靠性的衡量标准,并对其进行仿真和实测验证,证明在信噪比较低时,可以通过增加检测分析的次数来提高频谱分析准确率。该分析方法能作为频谱分析部分的补充,丰富资源的描述特征,使频谱分析的内容更全面、结果更可信,有效提高频谱利用率和通信质量。
关键词:
认知无线电,
频谱感知,
频谱资源分析,
可靠性分析,
频谱稳定性
Abstract: Cognitive Radio(CR) can find the frequencies cavity in a specific frequency range by sensing,learning and adapting the electromagnetic environment around,be familiar with the characteristics of the wireless signal,and use these results reasonably,ensure the use of idle spectrum resource for communication without causing interference to authorized users.In existing literature,there are few researches measuring the reliability of spectrum.Therefore,on the basis of energy detection method which is maturely developed and widely used presently,this paper proposes an analysis method of frequency spectrum resource about the reliability of frequency channel.It jointly consideres availability and stability as the two factors measuring reliability,also it conducts simulation and verification.Proved that in the condition of low Signal Noise Ratio(SNR),it may appropriately increase the number of test analysis in order to acquire the improvement of spectrum analysis accuracy.This method enriches the features of describing spectrum resources,which can be used as part of the supplement of the spectrum analysis to make its content more comprehensive and its results more reliable,and improve the spectrum utilization as well as communication quality has great contribution.
Key words:
Cognitive Radio(CR),
spectrum sensing,
spectrum resource analysis,
reliability analysis,
spectrum stability
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