Pub Date : 2019-10-01DOI: 10.1109/ATC.2019.8924557
T. Omura, Nythanel Hoeur, K. Maruta, Chanz-Jun Ahn
Under the fast fading environment, the estimated channel state information (CSI) is largely different from real channel state particularly in the last part of the packet. To mitigate this influence, we previously proposed a multilayer feedforward neural network (MLFNN) based channel estimation method. Regression capability of the MLFNN well estimated the whole transition of CSI. This network is trained by using a few CSI data set at beginning part of the packet. These partial CSIs are obtained by the pilot-aided channel estimation (PCE) and the decision feedback channel estimation (DFCE). However, MLFNN back-propagation (BP) training needs iterative renewal process of parameters. Thus, the computational complexity of the training part is quite large. To overcome this problem, this paper newly proposes a generalized regression neural network (GRNN) based channel estimation for OFDM system. Because of the direct detection method for parameters applied to GRNN, it can estimate the whole transition of channel states without huge complexity training and the processing delay. The computer simulation results clarifies that the proposed method can improve the BER performance even while the calculation quantity is minimized.
{"title":"Improving ANN based Channel Identification and Compensation using GRNN Method under Fast Fading Environment","authors":"T. Omura, Nythanel Hoeur, K. Maruta, Chanz-Jun Ahn","doi":"10.1109/ATC.2019.8924557","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924557","url":null,"abstract":"Under the fast fading environment, the estimated channel state information (CSI) is largely different from real channel state particularly in the last part of the packet. To mitigate this influence, we previously proposed a multilayer feedforward neural network (MLFNN) based channel estimation method. Regression capability of the MLFNN well estimated the whole transition of CSI. This network is trained by using a few CSI data set at beginning part of the packet. These partial CSIs are obtained by the pilot-aided channel estimation (PCE) and the decision feedback channel estimation (DFCE). However, MLFNN back-propagation (BP) training needs iterative renewal process of parameters. Thus, the computational complexity of the training part is quite large. To overcome this problem, this paper newly proposes a generalized regression neural network (GRNN) based channel estimation for OFDM system. Because of the direct detection method for parameters applied to GRNN, it can estimate the whole transition of channel states without huge complexity training and the processing delay. The computer simulation results clarifies that the proposed method can improve the BER performance even while the calculation quantity is minimized.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"177 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129403200","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924540
C. My, D. X. Bien, B. H. Tung, L. C. Hieu, N. V. Cong, T. Hiếu
The welding robots equipped with rotary positioners have been widely used in several manufacturing industries. However, for welding a 3D complex weld seam, a great deal of points should be created to ensure the weld path smooth. This is a boring job and is a great challenge - rotary positioner system since the robot and the positioner must move simultaneously at the same time. Therefore, in this article, a new inverse kinematics solution is proposed to generate the movement codes for a six DOFs welding robot incorporated with a rotary positioner. In the algorithm, the kinematic error is minimized, and the actual welding error is controlled so that it is always less than an allowable limit. It has shown that the proposed algorithm is useful in developing an offline CAD-based programming tool for robots when welding complex 3D paths. The use of the algorithm increases the accuracy of the end-effector positioning and orientation, and reduces the time for teaching a welding robot - positioner system. Simulation scenarios demonstrate the potency of the suggested method.
{"title":"Inverse kinematic control algorithm for a welding robot - positioner system to trace a 3D complex curve","authors":"C. My, D. X. Bien, B. H. Tung, L. C. Hieu, N. V. Cong, T. Hiếu","doi":"10.1109/ATC.2019.8924540","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924540","url":null,"abstract":"The welding robots equipped with rotary positioners have been widely used in several manufacturing industries. However, for welding a 3D complex weld seam, a great deal of points should be created to ensure the weld path smooth. This is a boring job and is a great challenge - rotary positioner system since the robot and the positioner must move simultaneously at the same time. Therefore, in this article, a new inverse kinematics solution is proposed to generate the movement codes for a six DOFs welding robot incorporated with a rotary positioner. In the algorithm, the kinematic error is minimized, and the actual welding error is controlled so that it is always less than an allowable limit. It has shown that the proposed algorithm is useful in developing an offline CAD-based programming tool for robots when welding complex 3D paths. The use of the algorithm increases the accuracy of the end-effector positioning and orientation, and reduces the time for teaching a welding robot - positioner system. Simulation scenarios demonstrate the potency of the suggested method.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133535106","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924506
Dao Dinh Ha, Trung Tran Tuan, V. Volcheck, V. Stempitsky
The effect of the presence of iron-induced acceptor centers in the gallium nitride high electron mobility transistor is studied using device physics simulations at elevated temperatures (up to 600 K), as a lattice heat flow equation is solved self-consistently with the Poisson and the continuity equations to account for self-heating effects. It is shown that the acceptor centers intentionally introduced in the buffer layer of the device cause a shift of the input characteristics in the positive direction.
{"title":"Iron-Induced Acceptor Centers in the Gallium Nitride High Electron Mobility Transistor: Thermal Simulation and Analysis","authors":"Dao Dinh Ha, Trung Tran Tuan, V. Volcheck, V. Stempitsky","doi":"10.1109/ATC.2019.8924506","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924506","url":null,"abstract":"The effect of the presence of iron-induced acceptor centers in the gallium nitride high electron mobility transistor is studied using device physics simulations at elevated temperatures (up to 600 K), as a lattice heat flow equation is solved self-consistently with the Poisson and the continuity equations to account for self-heating effects. It is shown that the acceptor centers intentionally introduced in the buffer layer of the device cause a shift of the input characteristics in the positive direction.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121854722","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924565
D. Tran, H. Zepernick
In this paper, we propose a spherical light-weight data hiding technique for 360-degree videos with equirectangular projection between sphere and plane. In particular, computationally efficient least significant bit (LSB) data hiding is applied to the color encoded equirectangular projection of the sphere. As viewers put more attention to the areas around the equator of a 360-degree video compared to the poles, LSB data hiding may be performed in the regions around the poles without causing perceptually significant quality degradation. In addition, the equirectangular projection induces a huge amount of data redundancy in the areas near the poles which increases the capacity available for LSB data hiding. A performance assessment of the proposed spherical light-weight data hiding technique is conducted using the weighted-to-spherically-uniform peak-signal-to-noise ratio (WS-PSNR) and the Craster parabolic projection PSNR (CPP-PSNR). Because both metrics take the non-linear relationship between samples on the sphere and the samples mapped to the plane into account, they are well suited for assessing the performance of the spherical LSB data hiding technique. Numerical results are provided for scenarios in which a 360-degree cover video carries a secret video using different numbers of bit planes. It is shown that video fidelity in terms of WS-PSNR and CPP-PSNR is indeed kept high in the 360-degree stego-video as long as the LSB data hiding is performed in the areas around the poles.
{"title":"Spherical Light-Weight Data Hiding in 360-Degree Videos With Equirectangular Projection","authors":"D. Tran, H. Zepernick","doi":"10.1109/ATC.2019.8924565","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924565","url":null,"abstract":"In this paper, we propose a spherical light-weight data hiding technique for 360-degree videos with equirectangular projection between sphere and plane. In particular, computationally efficient least significant bit (LSB) data hiding is applied to the color encoded equirectangular projection of the sphere. As viewers put more attention to the areas around the equator of a 360-degree video compared to the poles, LSB data hiding may be performed in the regions around the poles without causing perceptually significant quality degradation. In addition, the equirectangular projection induces a huge amount of data redundancy in the areas near the poles which increases the capacity available for LSB data hiding. A performance assessment of the proposed spherical light-weight data hiding technique is conducted using the weighted-to-spherically-uniform peak-signal-to-noise ratio (WS-PSNR) and the Craster parabolic projection PSNR (CPP-PSNR). Because both metrics take the non-linear relationship between samples on the sphere and the samples mapped to the plane into account, they are well suited for assessing the performance of the spherical LSB data hiding technique. Numerical results are provided for scenarios in which a 360-degree cover video carries a secret video using different numbers of bit planes. It is shown that video fidelity in terms of WS-PSNR and CPP-PSNR is indeed kept high in the 360-degree stego-video as long as the LSB data hiding is performed in the areas around the poles.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125097127","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924538
Nguyen Minh Giang, Trinh Huy Hoang
In this paper, we present a method for calculating propagation characteristics of high - frequency radio waves reflecting one time and two times at ionospheric layer F2 under inhomogeneous conditions of the ionosphere. The proposed method provides accurate calculation of the maximum usable frequency(MUF). Results of calculating frequency dependence of radio field strength show that scattering of radio waves in the ionosphere leads to the possibility of receiving radio waves at frequencies exceeding the maximum usable frequencies.
{"title":"Calculating Characteristics of HF Radio Waves Taking into Account Ionospheric Inhomogeneities","authors":"Nguyen Minh Giang, Trinh Huy Hoang","doi":"10.1109/ATC.2019.8924538","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924538","url":null,"abstract":"In this paper, we present a method for calculating propagation characteristics of high - frequency radio waves reflecting one time and two times at ionospheric layer F2 under inhomogeneous conditions of the ionosphere. The proposed method provides accurate calculation of the maximum usable frequency(MUF). Results of calculating frequency dependence of radio field strength show that scattering of radio waves in the ionosphere leads to the possibility of receiving radio waves at frequencies exceeding the maximum usable frequencies.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127074083","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924564
D. Duong
In this paper, we propose a novel multiple description coding method based on the Wyner-Ziv scheme for robust video transmission. In the proposed method, the motion vector (MV) field is encoded into two descriptions, which are transmitted over different paths to the decoder. Unlike the conventional methods, the correlation between descriptions in the proposed method is generated without using any additional redundant data since it can be estimated based on the high spatial correlation of MVs themselves in the MV field. At the decoder, this correlation is then employed as the side information in the Wyner-Ziv scheme to effectively improve the performance of the proposed method. Experimental results show that the proposed method can achieve a wide range of tradeoffs between coding efficiency and error resilience, and provide much better objective and subjective performance than other conventional MDC methods.
{"title":"Wyner-Ziv Scheme Based Multiple Description Coding for Robust Video Transmission over Path Diversity Networks","authors":"D. Duong","doi":"10.1109/ATC.2019.8924564","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924564","url":null,"abstract":"In this paper, we propose a novel multiple description coding method based on the Wyner-Ziv scheme for robust video transmission. In the proposed method, the motion vector (MV) field is encoded into two descriptions, which are transmitted over different paths to the decoder. Unlike the conventional methods, the correlation between descriptions in the proposed method is generated without using any additional redundant data since it can be estimated based on the high spatial correlation of MVs themselves in the MV field. At the decoder, this correlation is then employed as the side information in the Wyner-Ziv scheme to effectively improve the performance of the proposed method. Experimental results show that the proposed method can achieve a wide range of tradeoffs between coding efficiency and error resilience, and provide much better objective and subjective performance than other conventional MDC methods.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127894726","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924568
Tran Quang-Huy, Van Dien Nguyen, Van Dung Nguyen, Tran Duc-Tan
Density information has been used as a property of sound to restore objects in a quantitative manner in ultrasound tomography based on backscatter theory. In the traditional method, the authors only study the distorted Born iterative method (DBIM) to create density images using Tikhonov regularization. The downside is that the image quality is still low, the resolution is low, the convergence rate is not high. In this paper, we study the DBIM method to create density images using compressive sampling technique. With compressive sampling technique, the probes will be randomly distributed on the measurement system (unlike the traditional method, the probes are evenly distributed on the measurement system). This approach uses the l1 regularization to restore images. The proposed method will give superior results in image recovery quality, spatial resolution. The limitation of this method is that the imaging time is longer than the one in the traditional method, but the less number of iterations is used in this method.
{"title":"Density Imaging Using a Compressive Sampling DBIM approach","authors":"Tran Quang-Huy, Van Dien Nguyen, Van Dung Nguyen, Tran Duc-Tan","doi":"10.1109/ATC.2019.8924568","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924568","url":null,"abstract":"Density information has been used as a property of sound to restore objects in a quantitative manner in ultrasound tomography based on backscatter theory. In the traditional method, the authors only study the distorted Born iterative method (DBIM) to create density images using Tikhonov regularization. The downside is that the image quality is still low, the resolution is low, the convergence rate is not high. In this paper, we study the DBIM method to create density images using compressive sampling technique. With compressive sampling technique, the probes will be randomly distributed on the measurement system (unlike the traditional method, the probes are evenly distributed on the measurement system). This approach uses the l1 regularization to restore images. The proposed method will give superior results in image recovery quality, spatial resolution. The limitation of this method is that the imaging time is longer than the one in the traditional method, but the less number of iterations is used in this method.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122440979","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924547
Hanh Dang-Ngoc, Hieu Nguyen-Trung
Unmanned Aerial Vehicles (UAVs), which can provide an aerial view for fast responding in large-scale zones of disaster, are recently utilized for forest fire monitoring. In this paper, one general model of forest fire detection using aerial videos is investigated to prove its robustness for practical application of aerial forest fire surveillance. Fire pixels are extracted using the color and motion characteristics of fire. The fire detection performance is evaluated through a large database of various scene conditions to show the efficiency as well as deficiency of our fire detection model in previous study. Our database consists of 49 aerial videos with total of 16898 examined frames of forest fires. The accuracy rate of our forest fire detection model is 93.97 % while the false alarm rate and the miss rate are 7.08% and 6.86 %, respectively. Thick smoke which covers almost the fire is found as the main cause of miss detection in our fire detection model. To enhance the detection performance, in this study we propose one more stage of smoke detection. Smoke pixels are segmented using both color and motion characteristics of smoke. The results prove that smoke detection stage give help in detecting the fire area in case of smoke.
{"title":"Aerial Forest Fire Surveillance - Evaluation of Forest Fire Detection Model using Aerial Videos","authors":"Hanh Dang-Ngoc, Hieu Nguyen-Trung","doi":"10.1109/ATC.2019.8924547","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924547","url":null,"abstract":"Unmanned Aerial Vehicles (UAVs), which can provide an aerial view for fast responding in large-scale zones of disaster, are recently utilized for forest fire monitoring. In this paper, one general model of forest fire detection using aerial videos is investigated to prove its robustness for practical application of aerial forest fire surveillance. Fire pixels are extracted using the color and motion characteristics of fire. The fire detection performance is evaluated through a large database of various scene conditions to show the efficiency as well as deficiency of our fire detection model in previous study. Our database consists of 49 aerial videos with total of 16898 examined frames of forest fires. The accuracy rate of our forest fire detection model is 93.97 % while the false alarm rate and the miss rate are 7.08% and 6.86 %, respectively. Thick smoke which covers almost the fire is found as the main cause of miss detection in our fire detection model. To enhance the detection performance, in this study we propose one more stage of smoke detection. Smoke pixels are segmented using both color and motion characteristics of smoke. The results prove that smoke detection stage give help in detecting the fire area in case of smoke.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126705722","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924495
Ngoc Pham-Thi-Dan, Thiem Do-Dac, Khuong Ho‐Van, Son Vo-Que, Son Pham-Ngoc
The current paper proposes the exact analysis on the secrecy outage probability of energy scavenging cognitive radio networks over Nakagami-m fading channels and under both (interference and maximum transmit) power constraints and primary interference. The suggested analysis is verified by Monte-Carlo simulations. Multiple results demonstrate that primary interference, required security degree, and fading severity drastically impact the security performance. Moreover, this performance can be minimized by cleverly selecting time fraction.
{"title":"Effect of Nakagami-m Fading on Secrecy Outage of Energy Scavenging Underlay Cognitive Networks","authors":"Ngoc Pham-Thi-Dan, Thiem Do-Dac, Khuong Ho‐Van, Son Vo-Que, Son Pham-Ngoc","doi":"10.1109/ATC.2019.8924495","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924495","url":null,"abstract":"The current paper proposes the exact analysis on the secrecy outage probability of energy scavenging cognitive radio networks over Nakagami-m fading channels and under both (interference and maximum transmit) power constraints and primary interference. The suggested analysis is verified by Monte-Carlo simulations. Multiple results demonstrate that primary interference, required security degree, and fading severity drastically impact the security performance. Moreover, this performance can be minimized by cleverly selecting time fraction.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124171388","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 : 2019-10-01DOI: 10.1109/ATC.2019.8924528
Ngoc-Anh Vu, Hai-Nam Le, Thi-Hong-Tham Tran, Van‐Phuc Hoang, Quang-Kien Trinh
This paper presents the analysis of the nonlinear distortion model of the Low Noise Amplifier (LNA) for multichannel direct RF digitization receivers (DRF-RX). The distortion model gives insights into the nature of the LNA distortions and is used as the fundamental ground for distortion compensation. The paper further presents a fully-digital solution using a reference channel accompanied by a least mean square (LMS) circuit for adaptive distortion compensation. The LMS circuit uses the information from the reference channel to invert the distortion impacts caused by the LNA's nonlinearity in the main channel and eventually recover the linear component. A direct RF digitization UHF receiver with 4-QPSK channels was implemented in Matlab to evaluate the proposed method's efficiency. The performance of the compensation circuits has been studied in detail. The simulation results show that the proposed solution greatly improves the receiver performance. Compared to the receiver without compensation, the compensation circuit helps to lower the distortion components by ~20 dB and improve the bit error rate (BER) by 2 orders of magnitude.
{"title":"Adaptive Distortion Inversion Technique for LNA's Nonlinearity Compensation in Direct RF Digitization Receivers","authors":"Ngoc-Anh Vu, Hai-Nam Le, Thi-Hong-Tham Tran, Van‐Phuc Hoang, Quang-Kien Trinh","doi":"10.1109/ATC.2019.8924528","DOIUrl":"https://doi.org/10.1109/ATC.2019.8924528","url":null,"abstract":"This paper presents the analysis of the nonlinear distortion model of the Low Noise Amplifier (LNA) for multichannel direct RF digitization receivers (DRF-RX). The distortion model gives insights into the nature of the LNA distortions and is used as the fundamental ground for distortion compensation. The paper further presents a fully-digital solution using a reference channel accompanied by a least mean square (LMS) circuit for adaptive distortion compensation. The LMS circuit uses the information from the reference channel to invert the distortion impacts caused by the LNA's nonlinearity in the main channel and eventually recover the linear component. A direct RF digitization UHF receiver with 4-QPSK channels was implemented in Matlab to evaluate the proposed method's efficiency. The performance of the compensation circuits has been studied in detail. The simulation results show that the proposed solution greatly improves the receiver performance. Compared to the receiver without compensation, the compensation circuit helps to lower the distortion components by ~20 dB and improve the bit error rate (BER) by 2 orders of magnitude.","PeriodicalId":409591,"journal":{"name":"2019 International Conference on Advanced Technologies for Communications (ATC)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127802189","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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