Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438438
Pei-Yu Cheng, Yen-Ning Su, Yu-Cheng Chien, Chia-Hung Lai, G. Chen, I. Lu, Yueh-Min Huang
Student's reading attention is highly related to their reading ability and learning performance. Traditionally, it is a difficult procedure that when teachers want to observe the reading attention state of each students. In recent years, sensing technology-based applications and learning methods emerge in the increasingly mature environment. Most studies have shown the effectiveness of sensor-assisted learning system in helping teachers observe students' learning state. In order to help teachers effectively observe students' learning attention, this study developed Attention Recognition Mechanism (ARM) on e-book reading system by brainwave and visual. To derive more insights from the participants of the ARM on e-book system, five teachers were enrolled in the interview study. They commented that using attention recognition mechanism on e-book reading system can help teachers monitor the student's reading attention state and provide suitable feedback.
{"title":"Develop an Attention Recognition Mechanism on e-book reading system by brainwave and visual","authors":"Pei-Yu Cheng, Yen-Ning Su, Yu-Cheng Chien, Chia-Hung Lai, G. Chen, I. Lu, Yueh-Min Huang","doi":"10.1109/ICSENST.2015.7438438","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438438","url":null,"abstract":"Student's reading attention is highly related to their reading ability and learning performance. Traditionally, it is a difficult procedure that when teachers want to observe the reading attention state of each students. In recent years, sensing technology-based applications and learning methods emerge in the increasingly mature environment. Most studies have shown the effectiveness of sensor-assisted learning system in helping teachers observe students' learning state. In order to help teachers effectively observe students' learning attention, this study developed Attention Recognition Mechanism (ARM) on e-book reading system by brainwave and visual. To derive more insights from the participants of the ARM on e-book system, five teachers were enrolled in the interview study. They commented that using attention recognition mechanism on e-book reading system can help teachers monitor the student's reading attention state and provide suitable feedback.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121661282","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438464
R. Nojdelov, D. Voigt, A. V. D. Nes, S. Nihtianov
In this paper we present an investigation of the main non-idealities and error sources in precision capacitive displacement sensors. The sources of errors are described quantitatively and a compensation technique is proposed. The linearity of a capacitive sensor with self-alignment feature is tested with an optical Fabry-Perot displacement Interferometer. Experimental data from the practical implementation of the compensation is presented. Two different models for guard ring gap correction are compared and verified with the experimental data. Accuracy of better than 2 nm is achieved for displacement range of 15 μm, using only two calibration points.
{"title":"Investigation of error- and drift sources in a capacitive sensor system for sub-nanometer displacement measurement","authors":"R. Nojdelov, D. Voigt, A. V. D. Nes, S. Nihtianov","doi":"10.1109/ICSENST.2015.7438464","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438464","url":null,"abstract":"In this paper we present an investigation of the main non-idealities and error sources in precision capacitive displacement sensors. The sources of errors are described quantitatively and a compensation technique is proposed. The linearity of a capacitive sensor with self-alignment feature is tested with an optical Fabry-Perot displacement Interferometer. Experimental data from the practical implementation of the compensation is presented. Two different models for guard ring gap correction are compared and verified with the experimental data. Accuracy of better than 2 nm is achieved for displacement range of 15 μm, using only two calibration points.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121811402","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438441
A. Chowdhury, T. Banerjee, T. Chakravarty, P. Balamuralidhar
This paper presents a smartphone based application whereby a vehicle owner can obtain a reasonable prediction of the vehicle's potential failure time. Through a hybrid model-based and data-driven approach, one can obtain a predictive maintenance suggestion; given the current state of degradation. The smartphone is used both for sensing and computation. The proposed minimal-sensing approach is only meant to indicate Level-1 failure - the first step in identifying the existence of fault. Here, one assumes that the vehicle's vibration continues to increase over time thus indicating progressive degradation in its ability to absorb shock. The vertical vibration is measured using accelerometer and an appropriate measure is deduced for each completed trip. Furthermore, a trend line is obtained that continues to compute time-to-failure with respect to a pre-determined breakdown point. In addition, the effects of potentially rough driving style is also qualitatively accounted for. The results of its deployment in an office bus is presented. Detailed analysis on the data captured for passenger cars is in progress.
{"title":"Smartphone based sensing enables automated vehicle prognosis","authors":"A. Chowdhury, T. Banerjee, T. Chakravarty, P. Balamuralidhar","doi":"10.1109/ICSENST.2015.7438441","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438441","url":null,"abstract":"This paper presents a smartphone based application whereby a vehicle owner can obtain a reasonable prediction of the vehicle's potential failure time. Through a hybrid model-based and data-driven approach, one can obtain a predictive maintenance suggestion; given the current state of degradation. The smartphone is used both for sensing and computation. The proposed minimal-sensing approach is only meant to indicate Level-1 failure - the first step in identifying the existence of fault. Here, one assumes that the vehicle's vibration continues to increase over time thus indicating progressive degradation in its ability to absorb shock. The vertical vibration is measured using accelerometer and an appropriate measure is deduced for each completed trip. Furthermore, a trend line is obtained that continues to compute time-to-failure with respect to a pre-determined breakdown point. In addition, the effects of potentially rough driving style is also qualitatively accounted for. The results of its deployment in an office bus is presented. Detailed analysis on the data captured for passenger cars is in progress.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131187024","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438415
Ryuji Okimuro, M. Nishiyama, A. Hosoki, Kazuhiro Watanabe
We have developed a hetero-core structured fiber optic humidity sensor with a porous immobilized TiO2 nano-particles. Our research group has been proposed the hetero-core optical fiber humidity sensor due to moisture absorption of the hygroscopic polymer based on optical-intensity modulation. However, the sensor had difficulty in detecting the humidity change at lower humidity range less than 50 %RH. In this paper, we present that the hetero-core fiber humidity sensor has devised to increase the sensitivity at relatively lower humidity by means of including the TiO2 nano-particles in a porous sensitive film comparing to the conventional hetero-core fiber humidity sensor. On the other hand, a UV light has been known to make the TiO2 nano-particles indicate super-hydrophilic reaction and photo catalytic effect. Therefore, the sensitivity of the humidity sensor can be improved using the sensitive film including the TiO2 nanoparticles illuminated by the UV light. We tested the transmitted spectra of UV and visible band light of the proposed hetero-core fiber humidity sensor. As a result, the UV-LED light source could enhance the humidity sensitivity in the proposed hetero-core fiber optic sensor.
{"title":"Hetero-core fiber optic humidity sensor with layer-by-layer polymer film including TiO2 nanoparticles using UV light","authors":"Ryuji Okimuro, M. Nishiyama, A. Hosoki, Kazuhiro Watanabe","doi":"10.1109/ICSENST.2015.7438415","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438415","url":null,"abstract":"We have developed a hetero-core structured fiber optic humidity sensor with a porous immobilized TiO2 nano-particles. Our research group has been proposed the hetero-core optical fiber humidity sensor due to moisture absorption of the hygroscopic polymer based on optical-intensity modulation. However, the sensor had difficulty in detecting the humidity change at lower humidity range less than 50 %RH. In this paper, we present that the hetero-core fiber humidity sensor has devised to increase the sensitivity at relatively lower humidity by means of including the TiO2 nano-particles in a porous sensitive film comparing to the conventional hetero-core fiber humidity sensor. On the other hand, a UV light has been known to make the TiO2 nano-particles indicate super-hydrophilic reaction and photo catalytic effect. Therefore, the sensitivity of the humidity sensor can be improved using the sensitive film including the TiO2 nanoparticles illuminated by the UV light. We tested the transmitted spectra of UV and visible band light of the proposed hetero-core fiber humidity sensor. As a result, the UV-LED light source could enhance the humidity sensitivity in the proposed hetero-core fiber optic sensor.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134355568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438504
Ying Guo, J. Wall, Jiaming Li, S. West
The heating, ventilation, and air conditioning (HVAC) system is designed to provide thermal comfort and acceptable indoor air quality. A variety of sensing devices (such as temperature, humidity, velocity, or pressure sensors) are installed in the HVAC systems. In a realistic situation, the HVAC system can fail to satisfy performance expectations envisioned because of a variety of problems. This paper presents online sensor monitoring and fault detection techniques, as well as the key sensor sets selection approach to optimise the fault detection results. The methodology presented is also implemented in commercial buildings and experimental results show that different types of faults are detected successfully.
{"title":"Intelligent online sensor monitoring and fault alarm system in heating ventilation and air conditioning systems","authors":"Ying Guo, J. Wall, Jiaming Li, S. West","doi":"10.1109/ICSENST.2015.7438504","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438504","url":null,"abstract":"The heating, ventilation, and air conditioning (HVAC) system is designed to provide thermal comfort and acceptable indoor air quality. A variety of sensing devices (such as temperature, humidity, velocity, or pressure sensors) are installed in the HVAC systems. In a realistic situation, the HVAC system can fail to satisfy performance expectations envisioned because of a variety of problems. This paper presents online sensor monitoring and fault detection techniques, as well as the key sensor sets selection approach to optimise the fault detection results. The methodology presented is also implemented in commercial buildings and experimental results show that different types of faults are detected successfully.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134396820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438488
Marcelo Ribeiro
The RAMSRS (Robot-Aided Magnetic Sensors Readout Suit) consists of a system that integrates a robot arm with magnetic sensor readout units through a software which controls both the robot movements and the acquisition of data from the sensors. Permanent magnets are fixated to the robot arm though application specific magnet holders, while sensors read magnetic flux densities in 1D, 2D and 3D, so the integration software is able to combine accurate position information with magnetic field strength and present the output graphically for real time visualization as well as in comma separate value files for further analysis in external mathematical tools. The graphical interface of the integration software has a tabbed layout, where information is grouped into areas such as: status, configuration, control and measurement. The system has been developed to allow controlled magnet movements around magnetic sensors in order to identify the behavior of the magnetic field as seem by the sensor, which allows various different test experiments to be quickly performed in order to realize conceptual checks and validation of simulations, which saves development time and is a valuable step before manufacturing actual prototypes. Current applications include linear position detection, magnetic angle measurement, sensor characterization, validation of concepts, simulations and analytics, among others.
{"title":"Robot-Aided Magnetic Sensors Readout Suit","authors":"Marcelo Ribeiro","doi":"10.1109/ICSENST.2015.7438488","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438488","url":null,"abstract":"The RAMSRS (Robot-Aided Magnetic Sensors Readout Suit) consists of a system that integrates a robot arm with magnetic sensor readout units through a software which controls both the robot movements and the acquisition of data from the sensors. Permanent magnets are fixated to the robot arm though application specific magnet holders, while sensors read magnetic flux densities in 1D, 2D and 3D, so the integration software is able to combine accurate position information with magnetic field strength and present the output graphically for real time visualization as well as in comma separate value files for further analysis in external mathematical tools. The graphical interface of the integration software has a tabbed layout, where information is grouped into areas such as: status, configuration, control and measurement. The system has been developed to allow controlled magnet movements around magnetic sensors in order to identify the behavior of the magnetic field as seem by the sensor, which allows various different test experiments to be quickly performed in order to realize conceptual checks and validation of simulations, which saves development time and is a valuable step before manufacturing actual prototypes. Current applications include linear position detection, magnetic angle measurement, sensor characterization, validation of concepts, simulations and analytics, among others.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134109829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438479
V. Mohammadi, R. Kruijs, P. R. Rao, J. M. Sturm, S. Nihtianov
This paper presents our latest results from the investigation of the surface oxide content in boron capped layers used as the entrance window in ultraviolet silicon (UV-Si) photodetectors. These photodetectors have been studied electrically and optically to define the correlation between oxide content and performance, i.e. the direct relationship between the amount of undesired surface oxide in the active region where the boron layer is deposited, and the detector stability to high UV exposure levels. The boron capping layers were deposited by either chemical or physical vapor based deposition techniques (CVD or PVD). Although these techniques provide photodetectors that are highly sensitive to UV radiation [1], the formation of surface oxide during deposition is a major concern, especially for stability. To analyze the oxide content, an XPS (X-ray photoelectron spectroscopy) analysis was performed on high-temperature (HT-CVD: 700 °C), low-temperature (LT-CVD: 400 °C), and room-temperature (RT-CVD: 25 °C) based pure boron (PureB) photodetectors. An inverse relationship between deposition temperature and oxide content was noticed. While the HT-CVD based photodetectors were found to contain 30% of oxide in its active region, this amount drops to less than 10% for LT-CVD, and to a few percent for RT-PVD based process.
{"title":"Influence of the surface oxide content of a boron capping layer on UV photodetector performance","authors":"V. Mohammadi, R. Kruijs, P. R. Rao, J. M. Sturm, S. Nihtianov","doi":"10.1109/ICSENST.2015.7438479","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438479","url":null,"abstract":"This paper presents our latest results from the investigation of the surface oxide content in boron capped layers used as the entrance window in ultraviolet silicon (UV-Si) photodetectors. These photodetectors have been studied electrically and optically to define the correlation between oxide content and performance, i.e. the direct relationship between the amount of undesired surface oxide in the active region where the boron layer is deposited, and the detector stability to high UV exposure levels. The boron capping layers were deposited by either chemical or physical vapor based deposition techniques (CVD or PVD). Although these techniques provide photodetectors that are highly sensitive to UV radiation [1], the formation of surface oxide during deposition is a major concern, especially for stability. To analyze the oxide content, an XPS (X-ray photoelectron spectroscopy) analysis was performed on high-temperature (HT-CVD: 700 °C), low-temperature (LT-CVD: 400 °C), and room-temperature (RT-CVD: 25 °C) based pure boron (PureB) photodetectors. An inverse relationship between deposition temperature and oxide content was noticed. While the HT-CVD based photodetectors were found to contain 30% of oxide in its active region, this amount drops to less than 10% for LT-CVD, and to a few percent for RT-PVD based process.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132051423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438389
Dongwoo Suh, Lin Chen, W. Lu
Schottky photodiode fabricated with Ge/Si core/shell nanowires grown on Si (111) was quantitatively analyzed in terms of electrical properties as well as microstructure. The present device comprised of single nanowire grown by VLS process is quite sensitive enough to detect less than 1 pA at the mid infrared of 3 μm. The barrier of the present nanowire Schottky photodiode isj 1.5 volts. We scrutinized the electrical characteristics of the nanoscale Schottky junction both at forward and reverse bias ranges with thermionic model.
{"title":"Photoelectric characteristics of Schottky diode based on a Ge/Si core/shell nanowire","authors":"Dongwoo Suh, Lin Chen, W. Lu","doi":"10.1109/ICSENST.2015.7438389","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438389","url":null,"abstract":"Schottky photodiode fabricated with Ge/Si core/shell nanowires grown on Si (111) was quantitatively analyzed in terms of electrical properties as well as microstructure. The present device comprised of single nanowire grown by VLS process is quite sensitive enough to detect less than 1 pA at the mid infrared of 3 μm. The barrier of the present nanowire Schottky photodiode isj 1.5 volts. We scrutinized the electrical characteristics of the nanoscale Schottky junction both at forward and reverse bias ranges with thermionic model.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133827450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438417
Qingquan Sun
This paper presents a novel context-aware wireless sensor array system for scene analysis in multiple human monitoring. The goal of the research is to achieve real-time scene recognition and human identification through low-cost, low-data-throughput wireless pyroelectric sensor arrays. In the sensing information space, the scenes can be regarded as the combination of a bunch of basis in subspace. Such bases are extracted by using matrix factorization techniques. Geometry-regularized contextual pattern extraction and region of interest (RoI) identification schemes are developed and utilized. Experiment results demonstrate the capabilities of our context-aware sensing system on scene analysis and system adaption. The proposed context-aware wireless sensor system is not limited to pyroelectric sensors, it can be extended to various sensing modalities.
{"title":"Adaptive context-aware sensor array system for scene analysis in multiple human monitoring","authors":"Qingquan Sun","doi":"10.1109/ICSENST.2015.7438417","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438417","url":null,"abstract":"This paper presents a novel context-aware wireless sensor array system for scene analysis in multiple human monitoring. The goal of the research is to achieve real-time scene recognition and human identification through low-cost, low-data-throughput wireless pyroelectric sensor arrays. In the sensing information space, the scenes can be regarded as the combination of a bunch of basis in subspace. Such bases are extracted by using matrix factorization techniques. Geometry-regularized contextual pattern extraction and region of interest (RoI) identification schemes are developed and utilized. Experiment results demonstrate the capabilities of our context-aware sensing system on scene analysis and system adaption. The proposed context-aware wireless sensor system is not limited to pyroelectric sensors, it can be extended to various sensing modalities.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132339687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-12-01DOI: 10.1109/ICSENST.2015.7438419
M. P. Chang, P. Prucnal, Yanhua Deng
We propose and experimentally demonstrate an optical self-interference cancellation system to realize full-duplex spectrum sensing in cognitive radios. The optical system is an analog radio-frequency front-end module, which cancels in-band self-interference, enabling a radio to simultaneously transmit and receive signals. The system achieves 83 dB of narrowband interference cancellation, and 60 dB of cancellation of a 50 MHz frequency-modulated signal. The center frequency of the optical canceler is freely tunable across the radio frequency spectrum, limited only by the bandwidth of the photodetector and the electro-optic modulators to 10 GHz. The system is modulation-format independent and requires only one piece of hardware to operate across a wide radio-frequency bandwidth. By reducing self-interference to acceptably low powers, a cognitive radio can continuously sense its radio-frequency environment to detect the presence of a licensed user or scan for spectrum white spaces even while transmitting simultaneously.
{"title":"Full-duplex spectrum sensing in cognitive radios using optical self-interference cancellation","authors":"M. P. Chang, P. Prucnal, Yanhua Deng","doi":"10.1109/ICSENST.2015.7438419","DOIUrl":"https://doi.org/10.1109/ICSENST.2015.7438419","url":null,"abstract":"We propose and experimentally demonstrate an optical self-interference cancellation system to realize full-duplex spectrum sensing in cognitive radios. The optical system is an analog radio-frequency front-end module, which cancels in-band self-interference, enabling a radio to simultaneously transmit and receive signals. The system achieves 83 dB of narrowband interference cancellation, and 60 dB of cancellation of a 50 MHz frequency-modulated signal. The center frequency of the optical canceler is freely tunable across the radio frequency spectrum, limited only by the bandwidth of the photodetector and the electro-optic modulators to 10 GHz. The system is modulation-format independent and requires only one piece of hardware to operate across a wide radio-frequency bandwidth. By reducing self-interference to acceptably low powers, a cognitive radio can continuously sense its radio-frequency environment to detect the presence of a licensed user or scan for spectrum white spaces even while transmitting simultaneously.","PeriodicalId":375376,"journal":{"name":"2015 9th International Conference on Sensing Technology (ICST)","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133484939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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