Cognitive Radio Systems
Multiagent Learning for Aloha Like Spectrum Access in Cognitive Radio Systems
... Motivated by the above discussion and observation, in this paper, we study the problem of spectrum access without negotiation in multiuser and multichannel cognitive radio systems. The spectrum ...
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Fine Frequency Offset based Section Synchronization in Cognitive Radio Systems
... In case of low signal to noise ratio scenario is distracted or not uniform in orthogonal frequency division multiplexing (OFDM) system. So synchronization aspect in Cognitive Radio Systems (CRS) may ...
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Time-Delay Estimation in Dispersed Spectrum Cognitive Radio Systems
... In this paper, time-delay estimation is studied for dispersed spectrum cognitive radio systems. First, it is observed that maximum likelihood (ML) estimation is not very practical for time-delay ...
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Study of Primary User Emulation Attack in Cognitive Radio Systems
... of radio spectrum including revenue rich areas, came to know that some frequency bands in the spectrum are largely unoccupied most of the time and others bands are highly ...of radio spectrum. ...
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Spectrum Sensing in OFDM Using Trellis Code In Cognitive Radio Systems
... the cognitive radio to adapt to its environment by detecting the primary users that are receiving data within the communication range of an CR ...a cognitive radio to have a direct ...cellular ...
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Exploring the reconfigurability options of multi carrier CDMA in cognitive radio systems
... and cognitive wireless ...wireless systems presents several design and imple- mentation ...emerging systems, highlighting the following three main ...
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Energy-efficient spectrum sensing approaches for cognitive radio systems
... 26 In CBSS technique, CRs are divided into small groups (i.e., clusters) according to geographical locations and spectral circumstances. The BS collects the IDs and some radio information of all participating CRs, ...
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Reconfigurable Filter Antennas for Pulse Adaptation in UWB Cognitive Radio Systems
... ultrawideband cognitive radio (UWB-CR) systems, where unlicensed users communi- cate using adaptive pulses that have nulls in the bands used by licensed ...
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Meta Heuristic based Adaptation Engine for Cognitive Radio Systems
... a Cognitive Radio must have capabilities that mimic such Cognitive ...fundamental cognitive abilities of the radio, this paper proposes a novel adaptation method; which uses Real-coded ...
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Real Time Measurements for Adaptive and Cognitive Radio Systems
... the radio environment, the CP length needs to be designed for the worst-case channel ...the radio environment ...the radio channel, which is also related to the frequency ...
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Cognitive Radio Systems: Conceptual Architectures Cycles Designed Adaptations And Security
... of cognitive network as means to support user and applications requirement, no relevant and comprehensive analysis is available to address the performance and, in general, the behaviour of applications and ...
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The Optimal MMSE Transceiver Design for IoT-oriented Cognitive Radio Systems
... Cognitive Radio is a promising communication technology for IoT, since its opportunistic communication paradigm is suitable to communicating objects which can generate bursty traffic ...[4]. ...
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The Research of Beam Forming Algorithms In Cognitive Radio Systems
... Abstract. In view of the problem of CO frequency interference in the heterogeneous networks of cognitive radio, this paper presents a method of CO processing by macro cellular and micro cellular cells. A ...
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Combined Soft Hard Cooperative Spectrum Sensing in Cognitive Radio Networks
... The Radio Environment Maps (REM) is an emerging technology in the context of spectrum awareness that imposes the database approach and offers a functional facility of boosting the network functions by incorporat- ...
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Comparison Study of Time Synchronization in NC-OFDM Systems Based on Symmetric Correlator
... the Cognitive Radio (CR) system has many challenges in the synchronizing ...NC-OFDM systems on the multipath channel in the present of ...based Cognitive Radio ...NC-OFDM ...
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Scalar Wavelet packet based multi-user Cognitive Radio Transceiver
... Frequency offset can occur due to Doppler shift or by misalignment between the transmitted carrier frequency and the locallygenerated carrier frequency at the receiver. It destroys orthogonality among subcarriers and ...
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Cognitive Radio based Spectrum Sensing using different Wavelet Methods
... of cognitive radio which would not interfere with the primary use ...The cognitive radio is a type of the radio that has the ability to change the transmission and reception parameter ...
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Multiband Microstrip Antenna for Software Defined Radio/Cognitive Radio based Wireless Communication Systems
... Reconfigurability is achieved by integrating RF switches at selected locations across the slot. Three switching scenarios were selected, and these demonstrated a clear frequency selectivity of the antenna, as shown by ...
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Novel Radio Architectures for UWB, 60 GHz, and Cognitive Wireless Systems
... 802.11 systems, which means that oppor- tunities for dramatic cost and power reductions are ...OFDM radio requires high-speed digital-to-analog converter, up- conversion mixers, oscillators, and power ...
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CORRELATIVE ANALYSIS OF CYCLOSTATIONARY FEATURE DETECTION AND ENERGY DETECTION USING SIMULINK
... the cognitive cycle, as shown in Figure ...Using cognitive radio also requires significant changes to current regulations and policies on spectrum use, which may open a secondary market for the ...
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