Pub Date : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092424
M. Uhrina, J. Bienik, Tomas Mizdos
Crowdsourcing as one of the newest approaches in the field of Quality of Experience (QoE) has become more and more popular. Even though many papers deal with exploring the quality, most of them use objective or subjective laboratory methods. Publications comparing the quality of any codecs using crowdsourcing method are very rare. Although some of them utilize this approach, they use one of the web-based crowdsourcing frameworks with paid crowdworkers. In this paper we decided to present our own developed web-based crowdsourcing framework and use it as unpaid approach for evaluating two well-known compression standards - H.264 and H.265 and for comparing the results getting from testing via this crowdsourcing framework with results which we got from laboratory testing. These results showed that the subjective quality testing via unpaid crowdsourcing approach can be used as a replacement to the subjective laboratory testing, especially in cases where not very sophisticated evaluation is required.
众包作为体验质量(Quality of Experience, QoE)领域的最新手段之一，已经越来越受到人们的欢迎。尽管许多论文都是探讨质量的，但它们大多采用客观或主观的实验室方法。比较使用众包方法的编解码器质量的出版物是非常罕见的。尽管他们中的一些人使用这种方法，但他们使用的是一种基于网络的众包框架和付费的众包工作者。在本文中，我们决定展示我们自己开发的基于web的众包框架，并将其作为评估两个众所周知的压缩标准(H.264和H.265)的无偿方法，并将通过该众包框架测试得到的结果与我们从实验室测试得到的结果进行比较。这些结果表明，通过无偿众包方法进行的主观质量测试可以替代主观实验室测试，特别是在不需要非常复杂的评估的情况下。
{"title":"QoE on H.264 and H.265: Crowdsourcing versus Laboratory Testing","authors":"M. Uhrina, J. Bienik, Tomas Mizdos","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092424","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092424","url":null,"abstract":"Crowdsourcing as one of the newest approaches in the field of Quality of Experience (QoE) has become more and more popular. Even though many papers deal with exploring the quality, most of them use objective or subjective laboratory methods. Publications comparing the quality of any codecs using crowdsourcing method are very rare. Although some of them utilize this approach, they use one of the web-based crowdsourcing frameworks with paid crowdworkers. In this paper we decided to present our own developed web-based crowdsourcing framework and use it as unpaid approach for evaluating two well-known compression standards - H.264 and H.265 and for comparing the results getting from testing via this crowdsourcing framework with results which we got from laboratory testing. These results showed that the subjective quality testing via unpaid crowdsourcing approach can be used as a replacement to the subjective laboratory testing, especially in cases where not very sophisticated evaluation is required.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121340943","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092381
K. Pitaš, O. Fiser
In this contribution the one year period of the rain rate measurement in the Czech Republic was analyzed. The measurement was located at the experimental site of the Institute of Atmospheric Physics in the town of Hradec Králové. The measurement was performed by a tipping-bucket rain gauge of high resolution of 0.03 mm of rain amount per one tip and by 2D-videodistrometer from Joaneum Research. This study is focused on rain type classification from which the more precise rain attenuation on microwave link can be predicted. Beside description of simple methods using cheap rain amount and rain rate measurement three methods of sophisticated classification (Tokay-Short, Testud and Waldvogel methods) are described and compared using one year Czech distrometer data.
{"title":"On rainfall type classification to improve rain attenuation prediction","authors":"K. Pitaš, O. Fiser","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092381","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092381","url":null,"abstract":"In this contribution the one year period of the rain rate measurement in the Czech Republic was analyzed. The measurement was located at the experimental site of the Institute of Atmospheric Physics in the town of Hradec Králové. The measurement was performed by a tipping-bucket rain gauge of high resolution of 0.03 mm of rain amount per one tip and by 2D-videodistrometer from Joaneum Research. This study is focused on rain type classification from which the more precise rain attenuation on microwave link can be predicted. Beside description of simple methods using cheap rain amount and rain rate measurement three methods of sophisticated classification (Tokay-Short, Testud and Waldvogel methods) are described and compared using one year Czech distrometer data.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116210427","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092383
Irvine Mapfumo, T. Shongwe
To enhance the transmission capacity of communication systems, Power Line Communication (PLC) and Visible Light Communication (VLC) can be cascaded to form a hybrid PLC-VLC system. In this paper, we propose a DC biased Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) system that utilizes the Discrete Hartley Transform (DHT) instead of the traditional Fast Fourier Transform (FFT) for a hybrid PLC-VLC system. Simulation results show that the DHT based DCO-OFDM system performs virtually identical to the FFT based DCO-OFDM system. The proposed system is simple in design, has less computational complexity and improves spectral efficiency.
{"title":"Performance Comparison of FFT and DHT Hybrid PLC-VLC Systems Based on DCO-OFDM in Impulsive Noise","authors":"Irvine Mapfumo, T. Shongwe","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092383","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092383","url":null,"abstract":"To enhance the transmission capacity of communication systems, Power Line Communication (PLC) and Visible Light Communication (VLC) can be cascaded to form a hybrid PLC-VLC system. In this paper, we propose a DC biased Optical Orthogonal Frequency Division Multiplexing (DCO-OFDM) system that utilizes the Discrete Hartley Transform (DHT) instead of the traditional Fast Fourier Transform (FFT) for a hybrid PLC-VLC system. Simulation results show that the DHT based DCO-OFDM system performs virtually identical to the FFT based DCO-OFDM system. The proposed system is simple in design, has less computational complexity and improves spectral efficiency.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"311 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116341356","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092382
L. Polak, Jiří Miloš
In 2017, the Semtech company has released the SX1281 transceiver with the aim to provide Long-Range (LoRa) wireless data link in the 2.4 GHz Industrial, Scientific and Medical (ISM) radio frequency (RF) band. In the future, massive utilization of a LoRa-based technology can cause an origin of new unwanted coexistence scenarios in this license-free RF band. This paper focuses on the adjacent channel interference issues that can occur between Long Term Evolution (LTE) and LoRa systems in the 2.4 GHz band. The influence of LoRa signal on the LTE one is explored on physical (PHY) layer level. An automated laboratory measurement setup is employed to measure and calculate protection ratio for different LTE system configurations. Results show that LoRa with different system parameters influences the performance of LTE in different way.
{"title":"LTE and LoRa in the 2.4 GHz Band: Adjacent Channel Interference Issues","authors":"L. Polak, Jiří Miloš","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092382","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092382","url":null,"abstract":"In 2017, the Semtech company has released the SX1281 transceiver with the aim to provide Long-Range (LoRa) wireless data link in the 2.4 GHz Industrial, Scientific and Medical (ISM) radio frequency (RF) band. In the future, massive utilization of a LoRa-based technology can cause an origin of new unwanted coexistence scenarios in this license-free RF band. This paper focuses on the adjacent channel interference issues that can occur between Long Term Evolution (LTE) and LoRa systems in the 2.4 GHz band. The influence of LoRa signal on the LTE one is explored on physical (PHY) layer level. An automated laboratory measurement setup is employed to measure and calculate protection ratio for different LTE system configurations. Results show that LoRa with different system parameters influences the performance of LTE in different way.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"51 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127393456","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092357
L. Nagy, A. Chvála, V. Stopjaková
The paper addresses a non-standard ESD protection structures developed in general purpose 130 nm CMOS technology and modeled in VerilogA language for transistor-level circuit simulators. ESD structures represent an additional load to the on-chip circuits and can exhibit quite significant portion of the overall power consumption in low-voltage and low-power circuit designs. We describe and discuss the properties of ESD structures designed with minimized leakage current as the main design constraint, while still maintaining their protection capabilities. The other ESD structure discussed in this article was designed for negative voltage levels, which brings completely new possibilities in terms of the power supply voltage range and circuit design. The accuracy of developed VerilogA models is compared to experimental data obtained by laboratory measurement at room temperature and compact models provided by the foundry.
{"title":"Low-Leakage ESD Structures in 130nm CMOS Technology","authors":"L. Nagy, A. Chvála, V. Stopjaková","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092357","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092357","url":null,"abstract":"The paper addresses a non-standard ESD protection structures developed in general purpose 130 nm CMOS technology and modeled in VerilogA language for transistor-level circuit simulators. ESD structures represent an additional load to the on-chip circuits and can exhibit quite significant portion of the overall power consumption in low-voltage and low-power circuit designs. We describe and discuss the properties of ESD structures designed with minimized leakage current as the main design constraint, while still maintaining their protection capabilities. The other ESD structure discussed in this article was designed for negative voltage levels, which brings completely new possibilities in terms of the power supply voltage range and circuit design. The accuracy of developed VerilogA models is compared to experimental data obtained by laboratory measurement at room temperature and compact models provided by the foundry.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"432 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132300285","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092373
Marek Laban, M. Drutarovský
Physical unclonable function (PUF) represents modern element of cryptographic systems. Its advantage resides in generation of a unique identifier based on the physical structure of the device - hard to predict, difficult to clone. PUF usually require application of various constructions, in order to ensure security and reliability of the generated response. This paper describes an improved Code Word Masking method for reconstruction of a PUF response. Improved version is used for maximizing of a PUF response size and thus minimize requirements for an error correction code. The modification resides in repeated encoding of one response. The construction is performed two times, using two simple error correction codes. Such codes minimize complexity of the implementation and maximize utilization of the cells. The method is evaluated using implementation of the PUF in a 32-bit microcontroller. It is based on uninitialized values of static random access memory cells. The stability of the cells is analysed and just the most reliable cells are picked out. The implementation is more secure and effective, when compared to existing solutions. It was able to generate 140 bits using 512 PUF response bits without error, across various temperature and voltage levels. The security of the helper data does not depend on the statistical properties of the generated response.
{"title":"Improved Efficiency of PUF Response Reconstruction Method","authors":"Marek Laban, M. Drutarovský","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092373","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092373","url":null,"abstract":"Physical unclonable function (PUF) represents modern element of cryptographic systems. Its advantage resides in generation of a unique identifier based on the physical structure of the device - hard to predict, difficult to clone. PUF usually require application of various constructions, in order to ensure security and reliability of the generated response. This paper describes an improved Code Word Masking method for reconstruction of a PUF response. Improved version is used for maximizing of a PUF response size and thus minimize requirements for an error correction code. The modification resides in repeated encoding of one response. The construction is performed two times, using two simple error correction codes. Such codes minimize complexity of the implementation and maximize utilization of the cells. The method is evaluated using implementation of the PUF in a 32-bit microcontroller. It is based on uninitialized values of static random access memory cells. The stability of the cells is analysed and just the most reliable cells are picked out. The implementation is more secure and effective, when compared to existing solutions. It was able to generate 140 bits using 512 PUF response bits without error, across various temperature and voltage levels. The security of the helper data does not depend on the statistical properties of the generated response.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129067140","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092432
P. Kubinec, J. Púc̆ik, M. Hagara, E. Cocherová, O. Ondrácek
Determination of complex number modulus and argument is commonly encountered task in digital signal processing. According to definition, this task requires evaluation of square root and inverse tangent functions. When computing hardware resources are limited, e.g. in real-time applications, an approximation by basic arithmetic and logical operations are of interest. We propose method for modulus approximation that uses addition, scaling and comparison, and provides also argument information. At each additional level of our algorithm, modulus approximation error decreases by factor of 4 and argument error by factor of 8.
{"title":"Successive Approximation Algorithm for Complex Number Magnitude and Argument Computation","authors":"P. Kubinec, J. Púc̆ik, M. Hagara, E. Cocherová, O. Ondrácek","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092432","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092432","url":null,"abstract":"Determination of complex number modulus and argument is commonly encountered task in digital signal processing. According to definition, this task requires evaluation of square root and inverse tangent functions. When computing hardware resources are limited, e.g. in real-time applications, an approximation by basic arithmetic and logical operations are of interest. We propose method for modulus approximation that uses addition, scaling and comparison, and provides also argument information. At each additional level of our algorithm, modulus approximation error decreases by factor of 4 and argument error by factor of 8.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128201768","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092371
G. Proskura, Irina V. Vasilyeva, Fangfang Li, V. Lukin
A task of classification of multichannel remote sensing images compressed in a lossy manner is considered. It is recalled that lossy compression usually leads to reduction of classification accuracy both in aggregate and for particular classes. Distortions due to compression are characterized by visual quality metric desired values of which can be provided at compression stage. Dependence of probability of correct classification on image quality and compression ratio is analyzed for several widely used classifiers using a test image composed of three component images of Landsat data in visible range. It is shown that different classifiers are sensitive to distortions introduced by lossy compression in sufficiently different degree. We also propose a way to combine classifiers' outputs to improve classification results.
{"title":"Classification of Compressed Multichannel Images and Its Improvement","authors":"G. Proskura, Irina V. Vasilyeva, Fangfang Li, V. Lukin","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092371","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092371","url":null,"abstract":"A task of classification of multichannel remote sensing images compressed in a lossy manner is considered. It is recalled that lossy compression usually leads to reduction of classification accuracy both in aggregate and for particular classes. Distortions due to compression are characterized by visual quality metric desired values of which can be provided at compression stage. Dependence of probability of correct classification on image quality and compression ratio is analyzed for several widely used classifiers using a test image composed of three component images of Landsat data in visible range. It is shown that different classifiers are sensitive to distortions introduced by lossy compression in sufficiently different degree. We also propose a way to combine classifiers' outputs to improve classification results.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129293796","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092390
Irvine Mapfumo, T. Shongwe
This paper compares the performance of the FFT and DHT hybrid PLC-VLC systems based on Asymmetrically Clipped Optical - Orthogonal Frequency Division Multiplexing (ACO-OFDM) in impulsive noise. We will analyze and compare the Bit Error Rate (BER) performance of the two systems under the influence of Added White Gaussian Noise (AWGN) and Impulsive Noise (IN). Simulation results show that the Discrete Hartley Transform (DHT) based ACO-OFDM outperforms the Fast Fourier Transform (FFT) based ACO-OFDM cascaded PLC-VLC system.
{"title":"A Comparison of FFT and DHT Hybrid PLC-VLC Systems Based on ACO-OFDM in Impulsive Noise","authors":"Irvine Mapfumo, T. Shongwe","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092390","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092390","url":null,"abstract":"This paper compares the performance of the FFT and DHT hybrid PLC-VLC systems based on Asymmetrically Clipped Optical - Orthogonal Frequency Division Multiplexing (ACO-OFDM) in impulsive noise. We will analyze and compare the Bit Error Rate (BER) performance of the two systems under the influence of Added White Gaussian Noise (AWGN) and Impulsive Noise (IN). Simulation results show that the Discrete Hartley Transform (DHT) based ACO-OFDM outperforms the Fast Fourier Transform (FFT) based ACO-OFDM cascaded PLC-VLC system.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132055704","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 : 2020-04-01DOI: 10.1109/RADIOELEKTRONIKA49387.2020.9092399
Krishna Mohan Dwivedi, G. Trivedi, S. Khijwania
In this paper, we present an apodized Fiber Bragg grating (FBG) for the single and quasi-distributed sensing applications. Optical characteristics, such as reflectivity, Full-Width at Half Maximum (FWHM), and side-lobes of FBG critical for an efficient quasi-distributed sensing networks are optimized for the proposed grating. The coupled-mode theory and transfer matrix method are utilized to establish numerical modeling of apodized FBGs for single and quasi-distributed sensing networks. All the simulations are performed using MATLAB. Simulation results illustrate that for the optimized grating parameters L = 10 mm and $overline{delta{n}}=0.8 times 10^{-4}$, the proposed grating is characterized with reflectivity of 0.532, FWHM of 0.132 nm, Maximum Side-Lobe (MSL) of -36.25 dB, and Side-Lobe Suppression Ratio (SLSR) of -33.51 dB. Comparative performance analysis of the proposed grating with the elite apodization profiles, Gaussian and Tanh4z, is carried out through simulation. These results illustrate that the proposed grating has better reflectivity and FWHM as compared to Gaussian. It has better side-lobes suppression than Tanh4z apodized FBG structure as well. Generally, an FBG sensor characterized by the high reflectivity, narrower FWHM, and better side-lobes suppression is of great importance in Wavelength Division Multiplexing (WDM) quasi-distributed sensing networks. The optimized grating is utilized for five-stage WDM quasi-distributed strain and temperature sensing networks. A high dynamic strain/temperature range of 1450 µ∊/131.6°C is obtained using this optimized grating. This dynamic range of strain is very suitable for real-field structural health monitoring applications making our proposed grating a suitable candidate for the above mentioned application.
{"title":"Theoretical Study and Optimization of Apodized Fiber Bragg Grating for Single and Quasi-distributed Structural Health Monitoring Applications","authors":"Krishna Mohan Dwivedi, G. Trivedi, S. Khijwania","doi":"10.1109/RADIOELEKTRONIKA49387.2020.9092399","DOIUrl":"https://doi.org/10.1109/RADIOELEKTRONIKA49387.2020.9092399","url":null,"abstract":"In this paper, we present an apodized Fiber Bragg grating (FBG) for the single and quasi-distributed sensing applications. Optical characteristics, such as reflectivity, Full-Width at Half Maximum (FWHM), and side-lobes of FBG critical for an efficient quasi-distributed sensing networks are optimized for the proposed grating. The coupled-mode theory and transfer matrix method are utilized to establish numerical modeling of apodized FBGs for single and quasi-distributed sensing networks. All the simulations are performed using MATLAB. Simulation results illustrate that for the optimized grating parameters L = 10 mm and $overline{delta{n}}=0.8 times 10^{-4}$, the proposed grating is characterized with reflectivity of 0.532, FWHM of 0.132 nm, Maximum Side-Lobe (MSL) of -36.25 dB, and Side-Lobe Suppression Ratio (SLSR) of -33.51 dB. Comparative performance analysis of the proposed grating with the elite apodization profiles, Gaussian and Tanh4z, is carried out through simulation. These results illustrate that the proposed grating has better reflectivity and FWHM as compared to Gaussian. It has better side-lobes suppression than Tanh4z apodized FBG structure as well. Generally, an FBG sensor characterized by the high reflectivity, narrower FWHM, and better side-lobes suppression is of great importance in Wavelength Division Multiplexing (WDM) quasi-distributed sensing networks. The optimized grating is utilized for five-stage WDM quasi-distributed strain and temperature sensing networks. A high dynamic strain/temperature range of 1450 µ∊/131.6°C is obtained using this optimized grating. This dynamic range of strain is very suitable for real-field structural health monitoring applications making our proposed grating a suitable candidate for the above mentioned application.","PeriodicalId":131117,"journal":{"name":"2020 30th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127915691","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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