无线电通信技术
無線電通信技術
무선전통신기술
RADIO COMMUNICATIONS TECHNOLOGY
2014年
4期
33-36
,共4页
认知无线电%宽带频谱感知%调制宽带转换系统%时频聚集性
認知無線電%寬帶頻譜感知%調製寬帶轉換繫統%時頻聚集性
인지무선전%관대빈보감지%조제관대전환계통%시빈취집성
cognitive radio%wideband spectrum sensing%modulated wideband converter%time-frequency gathering density
提出了一种基于调制宽带转换系统（MWC ）和信号时频点集特征提取的宽带频谱感知方法。首先，利用MWC实现宽带模拟信号的低速率数字采样，对采样序列进行频谱重构得到各子带信号，同时宽带信道被划分为互不重叠的子带；其次，对各子带信号进行时频聚集性分析，提取时频点集特征，完成各子带信号检测，定义宽带感知向量以确定宽带频谱的具体占用情况，实现宽带频谱感知；最后进行仿真实验，结果表明了时频点集特征提取方法的可行性，以及其对噪声的不敏感特性，验证了该宽带频谱感知方法的有效性。
提齣瞭一種基于調製寬帶轉換繫統（MWC ）和信號時頻點集特徵提取的寬帶頻譜感知方法。首先，利用MWC實現寬帶模擬信號的低速率數字採樣，對採樣序列進行頻譜重構得到各子帶信號，同時寬帶信道被劃分為互不重疊的子帶；其次，對各子帶信號進行時頻聚集性分析，提取時頻點集特徵，完成各子帶信號檢測，定義寬帶感知嚮量以確定寬帶頻譜的具體佔用情況，實現寬帶頻譜感知；最後進行倣真實驗，結果錶明瞭時頻點集特徵提取方法的可行性，以及其對譟聲的不敏感特性，驗證瞭該寬帶頻譜感知方法的有效性。
제출료일충기우조제관대전환계통（MWC ）화신호시빈점집특정제취적관대빈보감지방법。수선，이용MWC실현관대모의신호적저속솔수자채양，대채양서렬진행빈보중구득도각자대신호，동시관대신도피화분위호불중첩적자대；기차，대각자대신호진행시빈취집성분석，제취시빈점집특정，완성각자대신호검측，정의관대감지향량이학정관대빈보적구체점용정황，실현관대빈보감지；최후진행방진실험，결과표명료시빈점집특정제취방법적가행성，이급기대조성적불민감특성，험증료해관대빈보감지방법적유효성。
The paper proposes a wideband spectrum sensing method based on modulated wideband converter(MWC)system and time-frequency point set feature extraction.First,the MWC system is used to implement wideband analog signal sampling at a low rate, the original frequency spectrum is restored to obtain digital signals and the whole wideband spectrum is divided into non-overlapping sub-bands.Then,the signal of each sub-band is detected by applying time-frequency gathering density analysis algorithm and extracting time-frequency point set features. The specific wideband frequency spectrum occupation is determined by defining the wideband spectrum sensing vector,and the wideband spectrum sensing is realized at the same time. Finally,the simulations experiment results show the validity of the method by indicating that the method of extracting time-frequency point set features is feasible and it is not sensitive to noise uncertainty.
