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dc.contributor.author刘蔼璇en_US
dc.contributor.authorLiu, Ai-Hsuanen_US
dc.contributor.author简凤村en_US
dc.contributor.authorChien, Feng-Tsunen_US
dc.date.accessioned2014-12-12T01:37:30Z-
dc.date.available2014-12-12T01:37:30Z-
dc.date.issued2009en_US
dc.identifier.urihttp://140.113.39.130/cdrfb3/record/nctu/#GT079711596en_US
dc.identifier.urihttp://hdl.handle.net/11536/44297-
dc.description.abstract在本篇论文,我们从序列式即时变化侦测的观点来探讨感知无线电网路频带侦测问题。为了能增进感知网路中次要使用者与主要使用者之间的共存性,我们提出以“累积和程序”为基础之演算法,在利用已知主要使用者之初始讯号结构下,能有效且即时地侦测到主要使用者的重新运作并归还次要使用者投机使用之频带资源以避免对主要使用者造成严重干扰。我们特别考虑感知使用者与主要使用者之间存在衰变通道且于接收端仅知通道统计特性下累和式即时变化侦测的可行性。
我们首先考虑一个由单一主要使用者和单一次要使用者所构成的感知无线电网路。在考虑衰变通道效应之下,我们从非同调与同调的角度出发各别提出以累积和程序为基础的即时侦测演算法。并于第二阶段,在考虑各种分散式协作机制之下,将先前所提出的累和式演算法推演于由多个次要使用者共同参与之合作式侦测,以期能进一步地藉由多重使用者所提供的空间多样性以增进即时侦测主要使用者活动的效能表现。在模拟中,我们在主要使用者的讯号模型上采取了IEEE 802.16e的长同步码做为序列侦测的目标,并且在各种衰变环境下验证并比较所提之累和式演算法的可行性与效能表现。
zh_TW
dc.description.abstractIn this thesis, we study the problem of spectrum sensing in cognitive radio networks from the view of sequential change-point detection (also called quickest detection). Aiming at avoiding interference to licensed primary users, which can help promote the willingness of the primary systems to accept the idea of coexistence with cognitive users, we propose several cumulative-sum (CUSUM)-based algorithms for detecting as quickly as possible the event that the dormant primary systems start reclaiming the use of the spectrum by exploiting the feature of the incipient part of the primary signals. Particularly, we are interested in the applicability of CUSUM-based tests to the coexistence problem when considering the fading effects between the cognitive and the primary user, given only the statistical channel information.

In the first part of the thesis, we consider the single-user scenario and propose four CUSUM-based algorithms according to different perspectives and manners on the fading effects under flat fading or frequency-selective fading environments. In the second part of the thesis, we extend the proposed CUSUM-based algorithms to the case of cooperative quickest detection, where a number of cognitive users provide decision strategies and collaboratively detect the beginning of the reclaims of the primary signals. In the simulations, we demonstrate the effectiveness of the proposed algorithms with the settings defined in IEEE 802.16e as the primary signal model. Comparisons of the proposed CUSUM-based algorithms are also provided in the simulations.
en_US
dc.language.isoen_USen_US
dc.subject感知无线电zh_TW
dc.subject频谱检测zh_TW
dc.subject累和式演算法zh_TW
dc.subject变化即时侦测zh_TW
dc.subjectCognitive radioen_US
dc.subjectSpectrum sensing detectionen_US
dc.subjectCUSUM algprithmen_US
dc.subjectChange detectionen_US
dc.subjectQuickest detectionen_US
dc.title感知无线网路下基于累和式演算法之频谱变化即时侦测研究zh_TW
dc.titleCUSUM-Based Quickest Spectrum Detection in Cognitive Radio Networksen_US
dc.typeThesisen_US
dc.contributor.department电子研究所zh_TW
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