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Rozprawy doktorskie na temat „Cooperative Spectrum Sensing (CSS)”

Autor: Grafiati

Data publikacji: 2 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Simpson, Oluyomi. "Optimal cooperative spectrum sensing for cognitive radio." Thesis, University of Hertfordshire, 2016. http://hdl.handle.net/2299/17246.

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The rapid increasing interest in wireless communication has led to the continuous development of wireless devices and technologies. The modern convergence and interoperability of wireless technologies has further increased the amount of services that can be provided, leading to the substantial demand for access to the radio frequency spectrum in an efficient manner. Cognitive radio (CR) an innovative concept of reusing licensed spectrum in an opportunistic manner promises to overcome the evident spectrum underutilization caused by the inflexible spectrum allocation. Spectrum sensing in an unsw

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Balakrishnan, Gautam. "Cognitive radio cooperative spectrum sensing." Thesis, California State University, Long Beach, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10252432.

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<p> The effectiveness of a cognitive radio (CR) system depends mainly on involved spectrum sensing techniques. The main aim of CR is for effective utilization of the spectrum opportunistically by sharing it with secondary users (SUs), when the primary user (PU) is absent. In this project, cooperative spectrum sensing using weights based on the distance measures from the PU and Multitaper Method (MTM) method is briefly explained. The results show that MTM method provides more accurate threshold value compared to other methods for low signal to noise ratios (SNRs), hence improving the spectrum s

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3

Noel, Adam Josiah Gerald. "Convex sensing-reporting optimization for cooperative spectrum sensing." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/36838.

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In this thesis, we consider the cooperative spectrum sensing problem in cognitive radio with energy detection. Secondary users with non-identical, independent sensing channels make 1-bit sensing decisions and report their decisions to the secondary base station over orthogonal noisy fading channels. The base station has knowledge of the reporting channel coefficients and acts as a fusion center by combining the decisions with an M-out-of-K rule. We allow the secondary users to trade sensing time slots for additional reporting time slots to increase the signal-to-noise ratios of the reporting c

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Prawatmuang, Warit. "Cooperative spectrum sensing for cognitive radio." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/cooperative-spectrum-sensing-for-cognitive-radio(db1dd626-841e-4b05-b5af-fa27e59c63bb).html.

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Cognitive Radio (CR) aims to access the wireless spectrum in an opportunistic manner while the licensed user is not using it. To accurately determine the licensed user's existence, spectrum sensing procedure is vital to CR system. Energy detection-based spectrum sensing techniques is favourable due to its simplicity and low complexity. In addition, to improve the detection performance, cooperative spectrum sensing technique exploits multi-user diversity and mitigates detection uncertainty. In this thesis, we investigate several energy detection based cooperative spectrum sensing techniques.Fir

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5

Kaligineedi, Praveen. "Cooperative spectrum sensing for cognitive radio networks." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/30261.

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Radio spectrum is a very scarce and important resource for wireless communication systems. However, a recent study conducted by Federal Communications Commission (FCC) found that most of the currently allocated radio spectrum is not efficiently utilized by the licensed primary users. Granting opportunistic access of the spectrum to unlicensed secondary users has been suggested as a possible way to improve the utilization of the radio spectrum. Cognitive Radio (CR) is an emerging technology that would allow an unlicensed (cognitive) radio to sense and efficiently use any available spectrum at a

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6

Sharkasi, Youssif F. "Cooperative spectrum sensing : performance analysis and algorithms." Thesis, University of Leeds, 2014. http://etheses.whiterose.ac.uk/8369/.

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The employment of cognitive (intelligent) radios presents an opportunity to efficiently use the scarce spectrum with the condition that it causes a minimal disturbance to the primary user. So the cognitive or secondary users use spectrum sensing to detect the presence of primary user. In this thesis, different aspects related to spectrum sensing and cognitive radio performance are theoretically studied for the discussion and in most cases, closedform expressions are derived. Simulations results are also provided to verify the derivations. Firstly, robust spectrum sensing techniques are propose

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Teguig, Djamel. "Cooperative Spectrum Sensing Algorithms For Cognitive Radio Networks." Doctoral thesis, Universite Libre de Bruxelles, 2015. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/219942.

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The work presented in this thesis concerns one of the key enabling techniques related to cognitive radio functionalities which is spectrum sensing as well as cooperative spectrum sensing. As cooperative spectrum sensing (CSS) approaches are commonly used for combating fading and improving detection performance, their performances using different combining rules have been analyzed. Due to the low implementation complexity, Goodness of Fit based spectrum sensing has been studied for cognitive radio applications. Motivated by its nice features of local sensing, a distributed consensus spectrum se

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8

jowkar, ghazaleh. "Cooperative Wideband Spectrum Sensing Based on Joint Sparsity." VCU Scholars Compass, 2017. http://scholarscompass.vcu.edu/etd/5055.

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COOPERATIVE WIDEBAND SPECTRUM SENSING BASED ON JOINT SPARSITY By Ghazaleh Jowkar, Master of Science A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science at Virginia Commonwealth University Virginia Commonwealth University 2017 Major Director: Dr. Ruixin Niu, Associate Professor of Department of Electrical and Computer Engineering In this thesis, the problem of wideband spectrum sensing in cognitive radio (CR) networks using sub-Nyquist sampling and sparse signal processing techniques is investigated. To mitigate multi-path fading, it is assumed that

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Althunibat, Saud. "Towards Energy Efficient Cooperative Spectrum Sensing in Cognitive Radio Networks." Doctoral thesis, Università degli studi di Trento, 2014. https://hdl.handle.net/11572/367952.

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Cognitive radio has been proposed as a promising technology to resolve the spectrum scarcity problem by dynamically exploiting underutilized spectrum bands. Cognitive radio technology allows unlicensed users, also called cognitive users (CUs), to exploit the spectrum vacancies at any time with no or limited extra interference at the licensed users. Usually, cognitive radios create networks in order to better identify spectrum vacancies, avoid resultant interference, and consequently, magnify their revenues. One of the main challenges in cognitive radio networks is the high energy consumption,

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Althunibat, Saud. "Towards Energy Efficient Cooperative Spectrum Sensing in Cognitive Radio Networks." Doctoral thesis, University of Trento, 2014. http://eprints-phd.biblio.unitn.it/1335/1/PhD_Dissertaion_Althunibat_Saud.pdf.

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Cognitive radio has been proposed as a promising technology to resolve the spectrum scarcity problem by dynamically exploiting underutilized spectrum bands. Cognitive radio technology allows unlicensed users, also called cognitive users (CUs), to exploit the spectrum vacancies at any time with no or limited extra interference at the licensed users. Usually, cognitive radios create networks in order to better identify spectrum vacancies, avoid resultant interference, and consequently, magnify their revenues. One of the main challenges in cognitive radio networks is the high energy consumption,

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11

SoÌ, nmezer Volkan. "Cooperative wideband spectrum sensing and localization using radio frequency sensor networks." Thesis, Monterey, California: Naval Postgraduate School, 2009. http://hdl.handle.net/10945/4612.

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Approved for public release, distribution unlimited<br>This thesis implements spectrum sensing and localization tasks using a radio frequency sensor network and analyzes the performance of this implementation through simulation. A sensor network based cooperative wideband spectrum sensing and localization scheme is proposed for the implementation of the tasks. In the proposed scheme, wavelet-based multi-resolution spectrum sensing and received signal strengthbased localization methods, which were originally proposed for cognitive radio applications, are adapted to radio frequency sensor

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Sönmezer, Volkan. "Cooperative wideband spectrum sensing and localization using radio frequency sensor networks." Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FSonmezer.pdf.

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Thesis (M.S. in Electronic Warfare Systems Engineering and M.S. in Electrical Engineering)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): Tummala, Murali ; Jenn, David. "September 2009." Description based on title screen as viewed on November 6, 2009. Author(s) subject terms: Cooperative Spectrum Sensing, Source Localization, Multi-Resolution Spectrum Sensing, Three-Bit Hard Combination, RSS-Based Localization, Cognitive Radio, Wireless Sensor Networks, Electronic Warfare. Includes bibliographical references (p. 87-90). Also available in print.

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13

Sudhamani, Chilakala [Verfasser]. "Performance of Cooperative Spectrum Sensing in Cognitive Radio Networks / Chilakala Sudhamani." München : GRIN Verlag, 2020. http://d-nb.info/1219301957/34.

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Rehman, Atti Ur, and Muhammad Asif. "Spectrum Sensing Techniques for 2-hop Cooperative Cognitive Radio Networks : Comparative Analysis." Thesis, Blekinge Tekniska Högskola, Sektionen för ingenjörsvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-3365.

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Spectrum sensing is an important aspect of cognitive radio systems. In order to efficiently utilize the spectrum, the role of spectrum sensing is essential in cognitive radio networks. The transmitter detection based techniques: energy detection, cyclostationary feature detection, and matched filter detection, is most commonly used for the spectrum sensing. The Energy detection technique is implemented in the 2-hop cooperative cognitive radio network in which Orthogonal Space Time Block Coding (OSTBC) is applied with the Decode and Forward (DF) protocol at the cognitive relays. The Energy dete

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15

Zhou, Xiangwei. "Efficient spectrum sensing and utilization for cognitive radio." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42714.

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Cognitive radio (CR) technology has recently been introduced to opportunistically exploit the spectrum. We present a robust and cost-effective design to ensure the improvement of spectrum efficiency with CR. We first propose probability-based spectrum sensing by utilizing the statistical characteristics of licensed channel occupancy, which achieves nearly optimal performance with relatively low complexity. Based on the statistical model, we then propose periodic spectrum sensing scheduling to determine the optimal inter-sensing duration and vary the transmit power at each data sample to enhanc

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Kasiri, Mashhad Behzad. "Providing Efﬁcient and Secure Cooperative Spectrum Sensing for Multi-Channel Cognitive Radio Networks". Wiley, 2010. http://hdl.handle.net/1993/23228.

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The focus of this thesis is on cooperative spectrum sensing and related security issues in multi-channel cognitive radio networks (MCCRNs). We ﬁrst study the channel assignment for cooperative spectrum sensing in MCCRNs to maximize the number of available channels. In centralized implementation, a heuristic scheme is proposed along with a greedy scheme to reduce the reported information from the cognitive radios (CRs). In distributed scenario, a novel scheme with multi-round operation is designed following the coalitional game theory. Next, we focus on the physical layer security issues for co

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17

Jackson, David S. "Rogue Signal Threat on Trust-based Cooperative Spectrum Sensing in Cognitive Radio Networks." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/3925.

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Cognitive Radio Networks (CRNs) are a next generation network that is expected to solve the wireless spectrum shortage problem, which is the shrinking of available wireless spectrum resources needed to facilitate future wireless applications. The first CRN standard, the IEEE 802.22, addresses this particular problem by allowing CRNs to share geographically unused TV spectrum to mitigate the spectrum shortage. Equipped with reasoning and learning engines, cognitive radios operate autonomously to locate unused channels to maximize its own bandwidth and Quality-of-Service (QoS). However, their in

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Kozal, Ahmed Sultan Bilal. "Multi user cooperation spectrum sensing in wireless cognitive radio networks." Thesis, Liverpool John Moores University, 2015. http://researchonline.ljmu.ac.uk/4474/.

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With the rapid proliferation of new wireless communication devices and services, the demand for the radio spectrum is increasing at a rapid rate, which leads to making the spectrum more and more crowded. The limited available spectrum and the inefficiency in the spectrum usage have led to the emergence of cognitive radio (CR) and dynamic spectrum access (DSA) technologies, which enable future wireless communication systems to exploit the empty spectrum in an opportunistic manner. To do so, future wireless devices should be aware of their surrounding radio environment in order to adapt their op

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Radhakrishnan, Aravind. "Android Phone Controlled Beagle Board Based PSCR in a Dynamic Spectrum Access Environment." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/35046.

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Public Safety Cognitive Radio (PSCR) is a Software Defined Radio(SDR) developed by the Center for Wireless Telecommunications (CWT) at Virginia Tech. PSCR can configure itself to interoperate with any public safety waveform it finds during the scan procedure. It also offers users the capability to scan/classify both analog and digital waveforms. The current PSCR architecture can only run on a general purpose processor and hence is not deployable to the public safety personnel. In the first part of this thesis an Android based control application for the PSCR on a Beagle Board(BB) and

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Jackson, David. "Exploiting Rogue Signals to Attack Trust-based Cooperative Spectrum Sensing in Cognitive Radio Networks." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/3072.

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Cognitive radios are currently presented as the solution to the ever-increasing spectrum shortage problem. However, their increased capabilities over traditional radios introduce a new dimension of security threats. Cooperative Spectrum Sensing (CSS) has been proposed as a means to protect cognitive radio networks from the well known security threats: Primary User Emulation (PUE) and Spectrum Sensing Data Falsification (SSDF). I demonstrate a new threat to trust-based CSS protocols, called the Rogue Signal Framing (RSF) intrusion. Rogue signals can be exploited to create the illusion of malic

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Yusuf, Idris A. "Optimising cooperative spectrum sensing in cognitive radio networks using interference alignment and space-time coding." Thesis, University of Hertfordshire, 2018. http://hdl.handle.net/2299/21106.

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In this thesis, the process of optimizing Cooperative Spectrum Sensing in Cognitive Radio has been investigated in fast-fading environments where simulation results have shown that its performance is limited by the Probability of Reporting Errors. By proposing a transmit diversity scheme using Differential space-time block codes (D-STBC) where channel state information (CSI) is not required and regarding multiple pairs of Cognitive Radios (CR's) with single antennas as a virtual MIMO antenna arrays in multiple clusters, Differential space-time coding is applied for the purpose of decision repo

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Yusuf, Idris A. "Optimizing cooperative spectrum sensing in cognitive radio networks using interference alignment and space-time coding." Thesis, University of Hertfordshire, 2017. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756585.

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In this thesis, the process of optimizing Cooperative Spectrum Sensing in Cognitive Radio has been investigated in fast-fading environments where simulation results have shown that its performance is limited by the Probability of Reporting Errors. By proposing a transmit diversity scheme using Differential space-time block codes (D-STBC) where channel state information (CSI) is not required and regarding multiple pairs of Cognitive Radios (CR’s) with single antennas as a virtual MIMO antenna arrays in multiple clusters, Differential space-time coding is applied for the purpose of decision repo

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Thibodeau, Brian Michael. "A Framework for Cooperative Wideband Spectrum Sensing Using the Robust Fast Fourier Aliasing-based Sparse Transform." Master's thesis, Temple University Libraries, 2016. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/389212.

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Electrical and Computer Engineering<br>M.S.E.E.<br>This research considers the problem of cooperatively identifying the active bands in a wideband spectrum using the sparse Fast Fourier Transform (sFFT). Existing research has focused primarily on Compressed Sensing (CS) and Multi-Coset (MC) sampling, but recent developments in the sFFT have shown that a sparsely occupied spectrum can be efficiently reconstructed using multiple co-prime analog-to-digital converters (ADC) that sample below the Nyquist rate. Specifically, this research utilizes the Robust Fast Fourier Aliasing-based Sparse Transf

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Jin, Lina. "Scheduling, spectrum sensing and cooperation in MU-MIMO broadcast and cognitive radio systems." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/scheduling-spectrum-sensing-and-cooperation-in-mumimo-broadcast-and-cognitive-radio-systems(300c7498-c0fb-478a-9f8d-39d005838fb6).html.

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In this thesis we investigate how to improve the performance of MU-MIMO wireless system in terms of achieving Shannon capacity limit and efficient use of precious resource of radio spectrum in wireless communication. First a new suboptimal volume-based scheduling algorithm is presented, which can be applied in MU-MIMO downlink system to transmit signals concurrently to multiple users under the assumption of perfect channel information at transmitter and receiver. The volume-based scheduling algorithm utilises Block Diagonalisation precoding and Householder reduction procedure of QR factorisati

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Sohul, Munawwar Mahmud. "PERFORMANCE OF LINEAR DECISION COMBINER FOR PRIMARY USER DETECTION IN COGNITIVE RADIO." OpenSIUC, 2011. https://opensiuc.lib.siu.edu/theses/705.

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The successful implementation and employment of various cognitive radio services are largely dependent on the spectrum sensing performance of the cognitive radio terminals. Previous works on detection of cognitive radio have suggested the necessity of user cooperation in order to be able to detect at low signal-to-noise ratios experienced in practical situations. This report provides a brief overview of the impact of different fusion strategies on the spectrum hole detection performance of a fusion center in a distributed detection environment. Different decision or detection rule and fusion

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Lara, Peinado Javier. "Minding the spectrum gaps : First steps toward developing a distributed white space sensor grid for cognitive radios." Thesis, KTH, Radio Systems Laboratory (RS Lab), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-123548.

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The idea that the radio spectrum is growing ever more scarce has become commonplace, and is being reinforced by the recent bidding wars among telecom operators. New wireless applications tend to be deployed in the relatively narrow unlicensed frequency bands, worsening the problem of interference for all users. However, not all frequency bands are in use in every location all the time, creating temporal and spatial gaps (also known as white spaces) that cognitive radio systems aim to take advantage of. In order to achieve that, such systems need to be able to constantly scan large chunks of t

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Ge, Feng. "Software Radio-Based Decentralized Dynamic Spectrum Access Networks: A Prototype Design and Enabling Technologies." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/29981.

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Dynamic spectrum access (DSA) wireless networks focus on using RF spectrum more efficiently and dynamically. Significant progress has been made during the past few years. For example, many measurements of current spectrum utilization are available. Theoretical analyses and computational simulations of DSA networks also abound. In sharp contrast, few network systems, particularly those with a decentralized structure, have been built even at a small scale to investigate the performance, behavior, and dynamics of DSA networks under different scenarios. This dissertation provides the theory, desig

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Gill, Kuldeep S. "Cognitive Radio Connectivity for Railway Transportation Networks." Digital WPI, 2018. https://digitalcommons.wpi.edu/etd-theses/129.

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Reliable wireless networks for high speed trains require a significant amount of data communications for enabling safety features such as train collision avoidance and railway management. Cognitive radio integrates heterogeneous wireless networks that will be deployed in order to achieve intelligent communications in future railway systems. One of the primary technical challenges in achieving reliable communications for railways is the handling of high mobility environments involving trains, which includes significant Doppler shifts in the transmission as well as severe fading scenarios t

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Sivakumaran, Arun. "Malicious user attacks in decentralised cognitive radio networks." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/79657.

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Cognitive radio networks (CRNs) have emerged as a solution for the looming spectrum crunch caused by the rapid adoption of wireless devices over the previous decade. This technology enables efficient spectrum utility by dynamically reusing existing spectral bands. A CRN achieves this by requiring its users – called secondary users (SUs) – to measure and opportunistically utilise the band of a legacy broadcaster – called a primary user (PU) – in a process called spectrum sensing. Sensing requires the distribution and fusion of measurements from all SUs, which is facilitated by a variety of arch

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Suliman, I. M. (Isameldin Mohammed). "Performance analysis of cognitive radio networks and radio resource allocation." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212753.

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Abstract Cognitive radio (CR) is becoming a promising tool for solving the problem of the scarce radio resource and spectrum inefficiency. Spectrum sensing (signal detection) enables real-time detection of spectrum holes by unlicensed secondary users (SUs) in cognitive radio networks (CRNs). In this thesis, performance analysis of CRNs and radio resource allocation are considered. A continuous time Markov chain (CTMC) based analytical model taking into account all relevant elements as well as addressing the issue of the false alarm rate (FAR) associated with the continuous sensing is developed

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Das, Dhritiman. "Cooperative Spectrum Sensing in Narrowband Cognitive Radio." Thesis, 2017. http://ethesis.nitrkl.ac.in/8852/1/2017_MT_DDas.pdf.

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The advancement in wireless communication technologies and rapid growth in bandwidth hungry application has aggravated the need for efficient utilization of the spectrum resource. Cognitive radio (CR) has emerged as a promising solution to the present problem of spectrum crisis. It increased the efficiency of spectrum utilization by allowing secondary/unlicensed user to coexist with the primary/licensed user in a particular spectrum band. The stringent requirement is a reliable and efficient spectrum sensing technique. In this thesis both hard and soft combination based cooperative spectrum se

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Yu, Wei-Chuan, and 游衛川. "Distributed Cooperative Spectrum Sensing in Cognitive Radio Networks." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/92366410416337340615.

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碩士<br>國立交通大學<br>電子工程系所<br>97<br>Abstract Cognitive radio network enables much higher spectrum efficiency by dynamic spectrum access. Therefore, it will be a popular technique for future wireless communications to mitigate the spectrum scarcity issue. Spectrum sensing is a main and tough task in cognitive radio networks. However, due to the effect of shadowing, fading, and time-varying nature of wireless channels, the individual cognitive radio may not be able to reliably and quickly detect the existence of a primary signal. In this thesis, we propose a simple yet efficient cooperation spec

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Yang, Zong-Ming, and 楊宗明. "Accumulative Cooperative Spectrum Sensing apply to Cognitive Radio System." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/mc4z25.

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碩士<br>國立東華大學<br>電機工程學系<br>100<br>Cooperative spectrum sensing plays a key role in a wireless cooperative cognitive radio system. This thesis describes a Cooperative spectrum sensing with reliability measurement architecture. In the proposed Cooperative spectrum sensing architecture, each cognitive radio user decides the primary user is active or not by the conventional energy detector. These sensing users will determine the results and transmitted to a reliable measurement of decision-making center to complete the detection result of the cooperative spectrum sensing. In this decision-making ce

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NianXia and 夏年. "Cooperative Spectrum Sensing Decision Rules over Imperfect Reporting Channels." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/88182254424704348804.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>102<br>With the rapid growth of wireless service, the limited spectrum resource is becoming more and more deficient. According to Federal Communications Commission’s (FCC) latest report, the existing fixed spectrum allocation policy severely underutilized the finite spectrum resource. Cognitive Radio (CR) is therefore proposed to serve as an alternative approach to utilize spectrums efficiently and spectrum sensing (SS) is an important element in CR. Cooperative Spectrum Sensing (CSS) can effectively reduce the false alarm and miss detection probabilities of spect

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Yen-TsungChung and 鍾延宗. "Neighborhood-based Cooperative Spectrum Sensing in Cognitive Radio Networks." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/78746537391517321014.

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Zeng, Yan-Ru, and 曾彥儒. "Relay Selection for Cooperative Spectrum Sensing in Cognitive Radio Networks." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/90747322382205257251.

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碩士<br>國立東華大學<br>電機工程學系<br>101<br>In this thesis, we consider cooperative spectrum sensing based on energy detection in cognitive radio networks. The signal energy values observed by different cognitive users will be combined by data fusion to assess probability of detection and probability of false alarm. At low signal-to-noise ratio (SNR), the maximum ratio combining (MRC) method proves to be better than equal gain combining (EGC) method in cognitive radio networks. Previous studies have presented that a relay selection scheme with maximum instantaneous SNR on its transmission path is selecte

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Liao, Che-Hui, and 廖哲輝. "Gaussian Processes for Cooperative Spectrum Sensing in Cognitive Radio Networks." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/31762341821049426402.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>104<br>This thesis proposes the application of machine learning which combine unsupervised learning and supervised learning classification techniques for cooperative spectrum sensing(CSS) in cognitive radio networks. This method is characterized by using the results of unsupervised K-means clustering algorithm as an input of Gaussian process to determine whether the channel is available or not. The classification need to go through a training phase which K-means clustering algorithm divided the training feature vectors into K clusters, where each cluster corresponds

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Tsai, Cheng-Jie, and 蔡承潔. "Clustering Strategies of Cooperative Spectrum Sensing in Cognitive Radio Networks." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/54390064744406330796.

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碩士<br>國立交通大學<br>電信工程研究所<br>99<br>Cognitive Radio (CR) is a promising technology to solve the spectrum scarcity problem in the recent years. Spectrum sensing plays an essential role for realizing the CR systems because better sensing performance can help to discover the spectrum opportunities and reduce the interference with the primary users (PUs). Cooperative Spectrum Sensing (CSS) is studied with great interest to achieve better performance than a single secondary user (SU). However, while considering the reporting errors, the performance of CSS is degraded. On the other hand, a large number

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Jayaprakasam, ArunKumar. "Sequential Detection Based Cooperative Spectrum Sensing Algorithms For Cognitive Radio." Thesis, 2010. https://etd.iisc.ac.in/handle/2005/1277.

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Cognitive radios are the radios which use spectrum licensed to other users. For this, they perform Radio Environment Analysis, identify the Spectral holes and then operate in those holes. We consider the problem of Spectrum Sensing in Cognitive Radio Networks. Our Algorithms are based on Sequential Change Detection techniques. In this work we have used DualCUSUM, a distributed algorithm developed recently for cooperative spectrum sensing. This is used by cognitive (secondary) nodes to sense the spectrum which then send their local decisions to a fusion center. The fusion center again sequent

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Jayaprakasam, ArunKumar. "Sequential Detection Based Cooperative Spectrum Sensing Algorithms For Cognitive Radio." Thesis, 2010. http://etd.iisc.ernet.in/handle/2005/1277.

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Cognitive radios are the radios which use spectrum licensed to other users. For this, they perform Radio Environment Analysis, identify the Spectral holes and then operate in those holes. We consider the problem of Spectrum Sensing in Cognitive Radio Networks. Our Algorithms are based on Sequential Change Detection techniques. In this work we have used DualCUSUM, a distributed algorithm developed recently for cooperative spectrum sensing. This is used by cognitive (secondary) nodes to sense the spectrum which then send their local decisions to a fusion center. The fusion center again sequenti

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Huang, Yen-Hsiang, and 黃彥翔. "A Study On Efficient Cooperative Spectrum Sensing For Cognitive Radio Networks." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/63471806530139162751.

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碩士<br>國立暨南國際大學<br>電機工程學系<br>102<br>In cognitive radio with cooperative spectrum sensing, the application of cooperation can bring spatial diversity gain, which can improve the detection error – rate performance in fading channel environments. In this aspect, conventional cooperative spectrum sensing usually employs all cognitive radio (CR) elements to help sensing the environment. However, this comes with high computational complexity and large processing delay. In this research, we propose a new detection way based on the cooperative spectrum sensing. Specifically, our method can reduce the n

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Lee, S. C., and 李慎中. "Distributed Spectrum Access with Low Complexity Cooperative Sensing in Cognitive Femtocell Networks." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/23364037083529783936.

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碩士<br>國立交通大學<br>電信工程研究所<br>100<br>In this thesis, we develop a sensing-based spectrum allocation scheme with joint spectrum overlay and underlay strategy to increase the frequency reuse factor among cognitive femtocell networks. The spectrum allocation problem is firstly formulated as a non-cooperative game and the regret-matching learning algorithm in game theory is used to solve the problem. To obtain the sensing-based information for spectrum allocation, a new maximum-minimum eigenvalue-based (MME-based) cooperative sensing scheme is proposed which shares the information of eigenvalues with

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Liu, Ting-Yu, and 劉庭宇. "An Efficient Cooperative Spectrum Sensing Using Energy Detector in Cognitive Radio Networks." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/49006207466339378020.

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碩士<br>國立清華大學<br>通訊工程研究所<br>99<br>Spectrum sensing is a very important issue in cognitive radio networks. In this thesis, we propose an efficient cooperative spectrum sensing scheme which can not only reduce the number of sensing reports to the fusion center but also ensure a low miss detection probability. In the scheme, each unlicensed (secondary) user senses the licensed band and makes a local decision of the sensing result by two thresholds λh and λo (λh > λo). As long as the fusion center receives a high assured sensing result from a secondary user, it can immediately make a global decisio

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Lee, Mong-Zhe, and 李孟哲. "Cooperative Spectrum Sensing Using a Weighted Fusion Rule for Cognitive Radio Networks." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/76510616113945316774.

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碩士<br>國立交通大學<br>電信工程研究所<br>99<br>In cognitive radio (CR) networks, because the distance of every CR user and the primary user is different, a signal may have interference and attenuation that affect the sensing ability of CR users. A CR user in mal-function or being hacked also results in wrong decision. Cooperative spectrum sensing is a way to decrease the probability of miss detection and the probability of false alarm. Therefore, the fusion rule is remarkably important. A good fusion rule is suitable for various circumstances because it can decrease significantly error probability. The erro

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Tlouyamma, Joseph. "The design and implementation of cooperative spectrum sensing algorithm in cognitive networks." Thesis, 2018. http://hdl.handle.net/10386/2412.

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Thesis (MSc.) -- University of Limpopo, 2018<br>A Major concern in the past years was the traditional static spectrum allocation which gave rise to spectrum underutilization and scarcity in wireless networks. In an attempt to solve this problem, cognitive radios technology was proposed and this allows a spectrum to be accessed dynamically by Cognitive radio users or secondary users (SUs). Dynamic access can efficiently be achieved by making necessary adjustment to some MAC layer functionalities such as sensing and channel allocation. MAC protocols play a central role in scheduling sensing peri

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Shaghluf, Nagwa. "Cooperative spectrum prediction for improved efficiency of cognitive radio networks." Thesis, 2017. https://dspace.library.uvic.ca//handle/1828/8986.

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In this thesis, the spectrum and energy efficiency of cooperative spectrum prediction (CSP) in cognitive radio networks are investigated. In addition, the performance of CSP is evaluated using a hidden Markov model (HMM) and a multilayer perceptron (MLP) neural network. The cooperation between secondary users in predicting the next channel status employs AND, OR and majority rule fusion schemes. These schemes are compared for HMM and MLP predictors as a function of channel occupancy in terms of prediction error, spectrum efficiency and energy efficiency. The impact of busy and idle state predi

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Hao-Yi and 戴豪逸. "Superior ERA Cooperative Spectrum Sensing with Differentiated Sensing Period and Gaussian-based Retreat Algorithms in Cognitive Radio." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/84uqhk.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>104<br>During the past dozen years, numerous approaches have been proposed to enhance the effi ciency of the cooperative spectrum sensing (CSS) technique in the cognitive radio (CR) systems. Reducing the signaling overheads and energy consumption during the reporting period are the main targets of these works. In this paper, we propose an effi cient reporting and accumulating (ERA) scheme to jointly improve the sensing and reporting e ciency. However, owing to individually reducing the sensing period for each secondary user (SU), the undesired collision problem du

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Wen, Hsin-Lun, and 温信綸. "Energy Detection Based Cooperative Spectrum Sensing of Data Fusion in Cognitive Radio Networks." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/07030606326810076034.

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碩士<br>國立東華大學<br>電機工程學系<br>103<br>Cognitive radio(CR) is a novel intelligent wireless communication technology. It is proposed to solve the problem that the spectrum is not averagely allocated when the wireless network is rapidly developed. Dynamic spectrum management is the most important mechanism of cognitive radio. We first have to detect the existence of the signal under a wireless environment, which is called the spectrum sensing technique. We choose energy detector(ED) as the spectrum sensing technique. The advantage is that it requires less prior knowledge with low complexity, so it

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Chen, Yin-Zong, and 陳尹宗. "Cooperative Spectrum Sensing and Optimization on Multi-Antenna Energy Detection in Rayleigh Fading Channel." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8rxq4p.

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碩士<br>國立東華大學<br>電機工程學系<br>105<br>In order to reduce the problem that the spectrum resources are not allocated uniformly, we adopt spectrum sensing of cognitive radio technology to find spectrum holes so that the cognitive users can legally use the licensed band, and reduce the waste of spectrum resources. In this thesis, the simulation of cognitive radio system works as follows: first, the system creates transmit signal by single antenna. Then several multiple antenna energy detectors are used as cognitive relays. The architecture becomes single-input multi-output system. In cooperative spectr

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Chen, Jian-Jhou, and 陳建州. "The Performance Evaluation of using MIMO Technology in Cooperative Spectrum Sensing Cognitive Radio Networks." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/4vy88v.

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碩士<br>國立東華大學<br>電機工程學系<br>104<br>Cognitive radio(CR) is an important technology used in wireless communication to improve the spectrum efficiency. Dynamic spectrum management serves as the main management mechanism in CR, and spectrum detection is responsible for detecting and identifying whether the signal is present in a wireless environment. 　　We use the energy detection(ED) as the spectrum sensing technology. We also use the beamforming as an effective way to enhance the detection efficiency and to improve the spectrum utilization efficiency. 　　In this thesis, we use multiple antennas on m

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