Pub Date : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10044033
Haitham S. Khallaf, E. M. Mohamed, K. Kato
In this letter, outage probability of terahertz (THz) link between two unmanned aerial vehicles (UAVs) is analytically and numerically investigated. Composite fading statistical model is developed considering joint effects of multipath fading, angle of arrival (AoA), and pointing-errors. The derived expression for outage probability is used to illustrate the misleading results in case of neglecting UAV antenna orientation fluctuations. In addition, effect of antenna half power beam width (HPBW) on maximum achievable link length under constraint of threshold outage probability is numerically investigated. Derived expression is validated by comparing analytical results with Monte Carlo (MC) simulation and they show high degree of agreement.
{"title":"Outage Performance of Inter-UAVs THz-Link under Composite Fading Channels","authors":"Haitham S. Khallaf, E. M. Mohamed, K. Kato","doi":"10.1109/JAC-ECC56395.2022.10044033","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10044033","url":null,"abstract":"In this letter, outage probability of terahertz (THz) link between two unmanned aerial vehicles (UAVs) is analytically and numerically investigated. Composite fading statistical model is developed considering joint effects of multipath fading, angle of arrival (AoA), and pointing-errors. The derived expression for outage probability is used to illustrate the misleading results in case of neglecting UAV antenna orientation fluctuations. In addition, effect of antenna half power beam width (HPBW) on maximum achievable link length under constraint of threshold outage probability is numerically investigated. Derived expression is validated by comparing analytical results with Monte Carlo (MC) simulation and they show high degree of agreement.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128674969","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10043913
A. Anter, Samir A. Elsagheer, A. B. Zaky
Computed tomography (CT) scans of the liver and hepatic lesions must be segmented in order to diagnose liver abnormalities precisely and reduce the likelihood of liver surgery. In this study, a dynamic hybrid model is proposed for the automatic identification and segmentation of hepatic lesions from CT scans. More specifically, a powerful optimization model for accuracy, speed, and optimal convergence based on kernel fuzzy c-means (FCM), chaotic map, and antlion optimization (ALO) algorithm for automatic hepatic focal lesion segmentation is proposed; named (CALO-FCM). In order to achieve the best cluster centroids and produce more accurate segmentation results, ALO is employed to guide FCM. By balancing exploration and exploitation rates, the performance of ALO is improved in terms of local minima avoidance and convergence speed. It might be argued that the CALO improves computational performance and prevents the FCM from becoming trapped in local minima. The proposed model shows good detection and segmentation outcomes on a set of patients with abdominal liver CT when compared to other methods. Additionally, the experimental findings demonstrated that the proposed model could locate the ideal centroids and avoid the local optima issue. This new hybrid model may lead to an earlier and more accurate clinical diagnosis of a hepatic lesion, assisting medical professionals in their judgement and enabling patients to receive an earlier prognosis.
{"title":"A robust Segmentation Model-based Fuzzy Swarm Intelligence and Logistic Chaotic Map for Hepatic CT Focal Lesion Segmentation","authors":"A. Anter, Samir A. Elsagheer, A. B. Zaky","doi":"10.1109/JAC-ECC56395.2022.10043913","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10043913","url":null,"abstract":"Computed tomography (CT) scans of the liver and hepatic lesions must be segmented in order to diagnose liver abnormalities precisely and reduce the likelihood of liver surgery. In this study, a dynamic hybrid model is proposed for the automatic identification and segmentation of hepatic lesions from CT scans. More specifically, a powerful optimization model for accuracy, speed, and optimal convergence based on kernel fuzzy c-means (FCM), chaotic map, and antlion optimization (ALO) algorithm for automatic hepatic focal lesion segmentation is proposed; named (CALO-FCM). In order to achieve the best cluster centroids and produce more accurate segmentation results, ALO is employed to guide FCM. By balancing exploration and exploitation rates, the performance of ALO is improved in terms of local minima avoidance and convergence speed. It might be argued that the CALO improves computational performance and prevents the FCM from becoming trapped in local minima. The proposed model shows good detection and segmentation outcomes on a set of patients with abdominal liver CT when compared to other methods. Additionally, the experimental findings demonstrated that the proposed model could locate the ideal centroids and avoid the local optima issue. This new hybrid model may lead to an earlier and more accurate clinical diagnosis of a hepatic lesion, assisting medical professionals in their judgement and enabling patients to receive an earlier prognosis.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"99 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127288809","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10043987
Chang Yang Lin, Yilong Lu, Wen-Piao Lin
In this paper, a 2×4 beamforming phase-shifting antenna array is designed for the Sub-6 GHz N77 (3.3 GHz4.2 GHz) frequency band. The array consists of 8 square FR4 material antennas connected by feed lines and 44-bit digital phase shifters. From the analysis results of the network analyzer, it can be seen that when the center frequency is 4GHz, the return loss is -14.36dB, which is lower than the standard threshold of -10dB. When the main beam angle is offset by 15°, the maximum gain is 8.03 dB; when the main beam angle is offset by -15°, the maximum gain is 7.25 dB.
{"title":"Design of Beamforming Phased Array Antenna for 5G Communication","authors":"Chang Yang Lin, Yilong Lu, Wen-Piao Lin","doi":"10.1109/JAC-ECC56395.2022.10043987","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10043987","url":null,"abstract":"In this paper, a 2×4 beamforming phase-shifting antenna array is designed for the Sub-6 GHz N77 (3.3 GHz4.2 GHz) frequency band. The array consists of 8 square FR4 material antennas connected by feed lines and 44-bit digital phase shifters. From the analysis results of the network analyzer, it can be seen that when the center frequency is 4GHz, the return loss is -14.36dB, which is lower than the standard threshold of -10dB. When the main beam angle is offset by 15°, the maximum gain is 8.03 dB; when the main beam angle is offset by -15°, the maximum gain is 7.25 dB.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125378372","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10043902
Hussein Ssali, M. Che, K. Kato
We analyzed the performance of a microstrip patch antenna fed by a 2 by 1 Wilkinson power combiner at 300 GHz. Simulation results show that a 2.54 dB gain in total radiated power can be achieved when the Wilkinson power combiner is used to feed the antenna compared to a single-port power feed. Results further show that the combiner provides a good isolation of -21.5 dB between the input ports. Additionally, the peak power in the +z (theta =0) direction for both xz and yz planes increases by 4.8 dB.
{"title":"Performance Analysis of a Wilkinson Power Combiner-Fed Patch Antenna for 300-GHz Arrayed Photomixers","authors":"Hussein Ssali, M. Che, K. Kato","doi":"10.1109/JAC-ECC56395.2022.10043902","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10043902","url":null,"abstract":"We analyzed the performance of a microstrip patch antenna fed by a 2 by 1 Wilkinson power combiner at 300 GHz. Simulation results show that a 2.54 dB gain in total radiated power can be achieved when the Wilkinson power combiner is used to feed the antenna compared to a single-port power feed. Results further show that the combiner provides a good isolation of -21.5 dB between the input ports. Additionally, the peak power in the +z (theta =0) direction for both xz and yz planes increases by 4.8 dB.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114145428","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10043925
Nehal Hamden, Ahmed Nasser, Mohamed Y. Selim, M. Elsabrouty
In this paper, we consider the sum rate maximization problem in a downlink unmanned aerial vehicles (UAV) assisted heterogeneous networks (HetNets) to mitigate existing interference. We propose to manage the interference by jointly optimizing the position of the UAV as well as power allocation. The proposed optimization problem is non-convex due to the non-linearity in the objective function and the constraints. We propose a near-optimal solution that breaks down the problem into two consecutive problems. First, we proposed a reinforcement learning-based technique to solve the UAV positioning problem. Then, a particle swarm optimization (PSO) based technique is applied to the power allocation problem. Simulation results demonstrate the efficiency of the proposed algorithm.
{"title":"Reinforcement Learning Based Technique for Interference Management in UAV Aided HetNets","authors":"Nehal Hamden, Ahmed Nasser, Mohamed Y. Selim, M. Elsabrouty","doi":"10.1109/JAC-ECC56395.2022.10043925","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10043925","url":null,"abstract":"In this paper, we consider the sum rate maximization problem in a downlink unmanned aerial vehicles (UAV) assisted heterogeneous networks (HetNets) to mitigate existing interference. We propose to manage the interference by jointly optimizing the position of the UAV as well as power allocation. The proposed optimization problem is non-convex due to the non-linearity in the objective function and the constraints. We propose a near-optimal solution that breaks down the problem into two consecutive problems. First, we proposed a reinforcement learning-based technique to solve the UAV positioning problem. Then, a particle swarm optimization (PSO) based technique is applied to the power allocation problem. Simulation results demonstrate the efficiency of the proposed algorithm.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"796 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116141445","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10043972
Nourhan El.Alashkar, T. Ismail
A vehicular ad hoc network (VANET) is a part of smart transportation. As a result of the vehicles being able to communicate with one another and share sensitive information, it is necessary to have an environment that can be trusted. Vehicles are clustered into platoons to ensure the secure transfer of information between them and select the platoon head of each platoon to control the vehicles. This paper proposes a smart control platoon system employing local and global trust schemes among vehicles in order to establish a secure environment. The platoon head calculates the local trust in each vehicle in the platoon. This allows the platoon head to authenticate trustworthy vehicles and prevent access to untrusted vehicles. In contrast, global trust is applied in the procedure of establishing the trust for the individual platoon.
{"title":"Developing Smart Control Platoon Algorithm for Secure VANET Environment","authors":"Nourhan El.Alashkar, T. Ismail","doi":"10.1109/JAC-ECC56395.2022.10043972","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10043972","url":null,"abstract":"A vehicular ad hoc network (VANET) is a part of smart transportation. As a result of the vehicles being able to communicate with one another and share sensitive information, it is necessary to have an environment that can be trusted. Vehicles are clustered into platoons to ensure the secure transfer of information between them and select the platoon head of each platoon to control the vehicles. This paper proposes a smart control platoon system employing local and global trust schemes among vehicles in order to establish a secure environment. The platoon head calculates the local trust in each vehicle in the platoon. This allows the platoon head to authenticate trustworthy vehicles and prevent access to untrusted vehicles. In contrast, global trust is applied in the procedure of establishing the trust for the individual platoon.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"88 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130540899","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10044018
Mohamed A. Khamis, A. El-Mahdy, Kholoud Shata, W. Gomaa
Accidents fatality is generally dependent on the time an emergency service is dispatched to the accident scene. Decreasing this time requires fast and accurate accident detection and notification systems. Therefore, existing well-established systems rely on rugged devices, with specialised hardware and accurate sensors to allow for in-vehicle detection and notification. Smartphones have been considered as an alternative mainly due to their much lower cost. In this paper, we show that reliable accident detection can be achieved using main stream smartphone sensors (e.g., accelerometer and gyroscope). The method relies on detecting the accident pulse through using Fourier transform and a random forest classifier. The method also utilises a moving window to incorporate time; and is simple enough to allow for during-accident detection, not requiring the mobile to survive the accident. We have validated the model using the Ollie car-like robot micro accident-testbed and the gold standard in accident simulation, LS-DYNA, achieving a true positive rate of about 96% and true negative rate of 99%.
{"title":"Fast Fourier Transform based Method for Accident Detection","authors":"Mohamed A. Khamis, A. El-Mahdy, Kholoud Shata, W. Gomaa","doi":"10.1109/JAC-ECC56395.2022.10044018","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10044018","url":null,"abstract":"Accidents fatality is generally dependent on the time an emergency service is dispatched to the accident scene. Decreasing this time requires fast and accurate accident detection and notification systems. Therefore, existing well-established systems rely on rugged devices, with specialised hardware and accurate sensors to allow for in-vehicle detection and notification. Smartphones have been considered as an alternative mainly due to their much lower cost. In this paper, we show that reliable accident detection can be achieved using main stream smartphone sensors (e.g., accelerometer and gyroscope). The method relies on detecting the accident pulse through using Fourier transform and a random forest classifier. The method also utilises a moving window to incorporate time; and is simple enough to allow for during-accident detection, not requiring the mobile to survive the accident. We have validated the model using the Ollie car-like robot micro accident-testbed and the gold standard in accident simulation, LS-DYNA, achieving a true positive rate of about 96% and true negative rate of 99%.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116319001","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10044034
Mohamed G. Abd El Ghafour, Ahmed H. Abd El‐Malek, O. Hassan, M. Abo-Zahhad
This paper investigates the secrecy performance of full-duplex cooperative vehicular relaying networks under passive eavesdropping attacks in the presence of co-channel interference. In the considered system model, a static source communicates with a static destination through a mobile full-duplex relay in the presence of a mobile passive eavesdropper and a static co-channel interferer. A closed-form expression for the exact secrecy outage probability of the system is derived for the Nakagami-m fading environment. Hence, the asymptotic secrecy outage probability is obtained at high signal-to-noise values. Numerical and Simulation results are obtained to validate the derived analytical expressions.
{"title":"Secrecy Outage Probability of Full-Duplex Relaying Vehicular Networks","authors":"Mohamed G. Abd El Ghafour, Ahmed H. Abd El‐Malek, O. Hassan, M. Abo-Zahhad","doi":"10.1109/JAC-ECC56395.2022.10044034","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10044034","url":null,"abstract":"This paper investigates the secrecy performance of full-duplex cooperative vehicular relaying networks under passive eavesdropping attacks in the presence of co-channel interference. In the considered system model, a static source communicates with a static destination through a mobile full-duplex relay in the presence of a mobile passive eavesdropper and a static co-channel interferer. A closed-form expression for the exact secrecy outage probability of the system is derived for the Nakagami-m fading environment. Hence, the asymptotic secrecy outage probability is obtained at high signal-to-noise values. Numerical and Simulation results are obtained to validate the derived analytical expressions.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"65 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125100406","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10044015
Norhan Elsayed Amer, Ahmed El Mahdy, Mohamed A. Khamis, W. Gomaa, A. Shoukry
Traffic fatalities are increasing in developing countries where there are few investments in road safety. Culture and road conditions also affect driving habits. Therefore, automatic detection and reporting of driver behavior to concerned entities can potentially save lives. In particular, we analyze a driving maneuvers dataset collected from one environment (country) but tested in another environment with aggressive driving habits and irregular road conditions. We also develop an on-edge system with fast response time to serve users on a large scale. Specffically, we propose an approach for detecting aggressive and normal events using random forest classifier. We utilize the accelerometer and gyroscope smartphone readings to classify driving maneuvers events to five types (aggressive acceleration, suddenly break, aggressive turn right, aggressive turn left, and normal). We achieved an accuracy of only 63.4% by training our model on an available dataset collected from a foreigner environment and tested on our environment. The lowest precision value was 54% while the lowest recall was 42%. However, we achieved an accuracy of 98.4% when augmenting an available dataset with data collected with our application. The lowest precision value was 98% while the lowest recall was 90%. From the results, it is shown that the available datasets do not generalize well to different driving habits and road conditions. Finally, an implementation of the random forest model using OpenCV on an Android platform is analyzed.
{"title":"On-Edge Driving Maneuvers Detection in Challenging Environments from Smartphone Sensors","authors":"Norhan Elsayed Amer, Ahmed El Mahdy, Mohamed A. Khamis, W. Gomaa, A. Shoukry","doi":"10.1109/JAC-ECC56395.2022.10044015","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10044015","url":null,"abstract":"Traffic fatalities are increasing in developing countries where there are few investments in road safety. Culture and road conditions also affect driving habits. Therefore, automatic detection and reporting of driver behavior to concerned entities can potentially save lives. In particular, we analyze a driving maneuvers dataset collected from one environment (country) but tested in another environment with aggressive driving habits and irregular road conditions. We also develop an on-edge system with fast response time to serve users on a large scale. Specffically, we propose an approach for detecting aggressive and normal events using random forest classifier. We utilize the accelerometer and gyroscope smartphone readings to classify driving maneuvers events to five types (aggressive acceleration, suddenly break, aggressive turn right, aggressive turn left, and normal). We achieved an accuracy of only 63.4% by training our model on an available dataset collected from a foreigner environment and tested on our environment. The lowest precision value was 54% while the lowest recall was 42%. However, we achieved an accuracy of 98.4% when augmenting an available dataset with data collected with our application. The lowest precision value was 98% while the lowest recall was 90%. From the results, it is shown that the available datasets do not generalize well to different driving habits and road conditions. Finally, an implementation of the random forest model using OpenCV on an Android platform is analyzed.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115901650","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 : 2022-12-19DOI: 10.1109/JAC-ECC56395.2022.10043918
Camellia S. Mouhammad, M. El-Shimy, H. Shalaby, H. N. Kheirallah
Visible light communication (VLC) systems are widely considered for adoption in the upcoming sixth-generation (6G) systems. This is because they provide a power-efficient, noncomplex, unlicensed frequency band, safe, and secure solution for data transmission. High data rates up to gigabit per second have been achieved in research over the past years using VLC. However, in order to achieve high data rates in such systems utilizing light emitting diodes (LEDs) already in the infrastructure, it is crucial to mitigate its impairments such as limited frequency response (tens of MHz bandwidth) and nonlinearity. In this paper, a novel transmitter system is proposed to compensate for the two main limitations in LED-based VLC systems. Different pulse shaping Nyquist filtering techniques are applied to minimize inter-symbol interference (ISI) caused by the LED's small modulation bandwidth. Additionally, a preequalizer is presented to alleviate LED nonlinearity. Results show an overall linear transmission and a significant enhancement in symbol-error rates (SER). Moreover, out-of-band side lobes are successfully suppressed, thus requiring smaller bandwidth for signal transmission without loss of information.
{"title":"Proposal of a Pre-equalizer with Nyquist Filtering to Mitigate LED Nonlinearity in PAM-4 VLC Systems","authors":"Camellia S. Mouhammad, M. El-Shimy, H. Shalaby, H. N. Kheirallah","doi":"10.1109/JAC-ECC56395.2022.10043918","DOIUrl":"https://doi.org/10.1109/JAC-ECC56395.2022.10043918","url":null,"abstract":"Visible light communication (VLC) systems are widely considered for adoption in the upcoming sixth-generation (6G) systems. This is because they provide a power-efficient, noncomplex, unlicensed frequency band, safe, and secure solution for data transmission. High data rates up to gigabit per second have been achieved in research over the past years using VLC. However, in order to achieve high data rates in such systems utilizing light emitting diodes (LEDs) already in the infrastructure, it is crucial to mitigate its impairments such as limited frequency response (tens of MHz bandwidth) and nonlinearity. In this paper, a novel transmitter system is proposed to compensate for the two main limitations in LED-based VLC systems. Different pulse shaping Nyquist filtering techniques are applied to minimize inter-symbol interference (ISI) caused by the LED's small modulation bandwidth. Additionally, a preequalizer is presented to alleviate LED nonlinearity. Results show an overall linear transmission and a significant enhancement in symbol-error rates (SER). Moreover, out-of-band side lobes are successfully suppressed, thus requiring smaller bandwidth for signal transmission without loss of information.","PeriodicalId":326002,"journal":{"name":"2022 10th International Japan-Africa Conference on Electronics, Communications, and Computations (JAC-ECC)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116103464","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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