Results 121 to 130 of about 138,567 (160)

Privacy-preserving crowdsourced spectrum sensing

IEEE INFOCOM 2016 - The 35th Annual IEEE International Conference on Computer Communications, 2016
Crowdsourced spectrum sensing has great potential in improving current spectrum database services. Without strong incentives and location privacy protection in place, however, mobile users will be reluctant to act as mobile crowdsourcing workers for spectrum sensing tasks.
Xiaocong Jin, Yanchao Zhang
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Spectrum sensor for distributed spectrum sensing

2012 IEEE Consumer Communications and Networking Conference (CCNC), 2012
For the efficient use of spectrum resource, it is important to understand spectrum occupancy at a high spatial resolution, so a large number of measurement locations are required. In this work, in order to increase measurement locations, we design and implement a low-end spectrum sensor which is capable of switching to different channels in a spectrum ...
Hojun Kim, Makoto Suzuki, Masateru Minami, Hiroyuki Morikawa   +3 more
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Cooperative Spectrum Sensing

2014
The main objective of this chapter is to provide a detailed technical insight into latest key aspects of cooperative spectrum sensing. We focus on fusion strategies, quantization enhancements, effect of imperfect reporting channel, cooperative spectrum sensing scheduling, and utilizing cooperatively sensed data via Radio Environment Map (REM).
H. Birkan Yilmaz, Salim Eryigit, Tuna Tugcu   +2 more
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Spectrum sensing challenges: blind sensing and sensing optimization

IEEE Instrumentation & Measurement Magazine, 2016
By any measure, wireless communications is one of the most evolving fields in engineering. This, in return, has imposed many challenges, especially in handling the hunger for higher data rates in the next generation wireless networks. Among these challenges is how to provide the needed resources in terms of the electromagnetic radio spectrum for these ...
Mohamed Hamid, Slimane Ben Slimane, Wendy Van Moer, Niclas Bjorsell   +3 more
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Compressive Spectrum Sensing

2019
In this chapter, the authors discuss how compressive sensing can be used in wideband spectrum sensing in cognitive radio systems. Compressive sensing helps decrease the complexity and processing time and allows for higher data rates to be used, since it makes it possible for the signal to be sampled at rates lower than the Nyquist rate and still be ...
Said E. El-Khamy, Mina B. Abd el-Malek, Sara H. Kamel   +2 more
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Sensing Confidence Level-Based Cooperative Spectrum Sensing Algorithm

Applied Mechanics and Materials, 2012
Cooperative spectrum sensing is a key technology to tackle the challenges such as fading or hidden terminal problem in local spectrum sensing of cognitive radio system. Conventional cooperative method can improve the detection performance in some sense, but increase overhead of control channel.
null Shibing Zhang, null Hailian Wang, null Jingping Mei   +2 more
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Cooperative Spectrum Sensing for Dynamic Spectrum Access

2009 WRI International Conference on Communications and Mobile Computing, 2009
In cognitive networks, cooperative spectrum sensing is employed to detect the presence of primary user quickly. In this paper, we study the sensing performance of a cognitive user U1 by allowing another cognitive user U2 to act as its relay. We vary the scaling factors (used by the relay U2 to amplify its received signal) of the unconstrained scheme ...
Yunxue Liu, Dongfeng Yuan, Mingyan Jiang, Gang Jin, Shasha Ji, Xiaozhen Liu   +5 more
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Universal Quickest Spectrum Sensing

2016 IEEE Global Communications Conference (GLOBECOM), 2016
In modern cognitive ratio systems, the spectrum is becoming increasingly crowded and expensive; thus spectrum sensing becomes more important than ever before. Traditional spectrum sensing assumes Gaussian noise (or of other given distributions) in general. However when secondary users (SUs) have no prior information about the measurement distributions,
Yifan Wang, Husheng Li
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Cooperative Spectrum Sensing Technique

2007 International Conference on Wireless Communications, Networking and Mobile Computing, 2007
Cognitive Radios (CRs), which sense the spectrum and implement opportunistic sharing when no licensed user is found to use it, are able to improve the efficiency of spectrum. Spectrum sensing must be firstly solved in CRs. Cooperative sensing can make good use of network resources, obtain higher gain and make the network steadier. In this paper we give
Yu Zhang, Wen-Dong Yang, Yue-Ming Cai
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Spectrum Sensing Techniques

2019
Cognitive radio has come a long way in the recent years with the advent of improved algorithms and instrumentation. However, for ease and efficient working of cognitive radio, there is a need to have effective detection of spectrum sensing. The objective of spectrum sensing techniques is to find spectrum holes which can be accessible by the users of ...
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