Results 231 to 240 of about 22,406 (266)
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Low-power architecture for wideband spectrum sensing
2012 3rd International Workshop on Cognitive Information Processing (CIP), 2012In this paper, a novel power efficient architecture for detecting the spectral holes over a very high bandwidth is proposed. Wideband spectrum sensing poses serious challenges for low-power spectrum sharing radios (for e.g., cognitive radio) which cannot afford to use high-rate Analog-to-Digital Converters (ADCs) to sample the signals at Nyquist rate ...
Sundeep Prabhakar Chepuri +2 more
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Wideband Digital Channelizer based on Spectrum Sensing
2020 Third International Conference on Advances in Electronics, Computers and Communications (ICAECC), 2020A Software Defined Radio (SDR) has advanced significantly in all fields including military and mobile communications. In this paper, main requirement of a SDR is presented to effectively channelize the wideband input signal into sub-bands. A channelizer splits a broadband input signal into independent signals.
Bindu H M, Kiran A Gupta
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How wideband receiver nonlinearities impact spectrum sensing
2013 IEEE Global Conference on Signal and Information Processing, 2013Wideband receivers are appealing for cognitive radio spectrum sensing as they allow sensing multiple subbands in parallel. However, wideband radio front-end circuits introduce various impairments into the received signal, which make detection of unoccupied bands difficult.
Eric Rebeiz, Danijela Cabric
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Efficient Wideband Spectrum Sensing: a Methodological Approach
International Journal on Communications Antenna and Propagation (IRECAP), 2017This article proposes a set of methodological steps that allows to address the problem of spectrum sensing in Cognitive Radio (CR) systems, allowing also to address the practical challenges involved in implementing this function; In the same way, the proposed methodological stages are validated through the formulation of a broadband spectrum sensing ...
Evelio Astaiza +2 more
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Likelihood ratio test for wideband spectrum sensing
2013 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM), 2013In this paper, we propose a novel detection scheme of spectrum sensing for cognitive radio with multiple receive antennas operating over a wideband channel composed of a multitude of subbands. By taking the observations in all subbands into consideration in the likelihood ratio test for sensing a subband, the proposed scheme can provide better ...
Taehun An +3 more
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Network coding based wideband compressed spectrum sensing
2012 IEEE International Conference on Communications (ICC), 2012One of the fundamental components in cognitive radios (CRs) is spectrum sensing. For sensing the wide range of frequency bands, CRs need high sampling rate analog to digital converters (ADCs) which have to operate at or above the Nyquist rate. The high operating rate constitutes a major implementation challenge.
Hoda Dehghan +2 more
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Invariant wideband spectrum sensing under unknown variances
IEEE Transactions on Wireless Communications, 2009In this paper, we divide a wide frequency range into multiple subbands and in each subband detect whether in a primary user (PU) is active or not. We assume that PU signal at each subband and the additive noise are white zero-mean independent Gaussian random processes with unknown variances.
Abbas Taherpour +2 more
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Quickest Wideband Spectrum Sensing Over Correlated Channels
IEEE Transactions on Communications, 2015Quickest spectrum sensing seeks to optimize a balance between two opposing performance measures, one being the delay in identifying spectrum opportunities, and the other being the quality of the decision. The existing spectrum sensing approaches formed based on quickest detection theory rely on the assumption that the occupancy states of different ...
Ali Tajer, Javad Heydari
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Subspace-based 1-bit Wideband Spectrum Sensing
2019 11th International Conference on Wireless Communications and Signal Processing (WCSP), 2019We consider spectrum sensing in a wideband cognitive radio system where 1-bit analog-to-digital converters (ADCs) are adopted at the radio frequency (RF) sensors. We focus on a practical scenario where multiple narrow-band radio systems coexist in the considered wide spectrum range and the RF sensor has no prior knowledge about those ambient radio ...
Junquan Deng, Yong Chen
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Cooperative Wideband Spectrum Sensing
2021Kamal M. Captain, Manjunath V. Joshi
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