Pub Date : 2023-07-01DOI: 10.12720/jcm.18.7.453-461
Sampurna Dadi, Selo Sulistiyo, Wayan Mustika
Spectrum is a limited resource, so it must be used effectively. The fixed spectrum allocation method currently in operation may not sustain the growth in the network access users, which continues to increase over time. Many studies have shown that the spectrum deficiency problem can be solved with cognitive radio network (CRN) technology. CRN allows flexible spectrum utilization. Spectrum handoff is one of the fundamental prerequisites for dynamic spectrum access in cognitive radio networks. The ping-pong effect is one of the problems caused by the frequent occurrence of unnecessary handoff spectrum. So, in CRN, the right handoff decision is needed to avoid the ping-pong effect. The proposed fuzzy system carries the concept of a fuzzy tree that uses two fuzzy inference systems (FIS), which work in two stages, namely FIS-1 and FIS-2. In the early stages, the FIS-1 controls the secondary users (SU) power and prevents interference with the primary users (PU). FIS-2 is used to execute precise spectrum handoff decisions. The test results show that the amount of handoff spectrum has decreased by up to 43 % compared to other methods, which are only 60 %. This results in a decrease of 16.67% from the previous method. Thus, the ping-pong effect can be minimized with the right handoff decisions.
{"title":"Fuzzy Tree Schematic for Spectrum Handoff Reduction in Cognitive Radio Networks","authors":"Sampurna Dadi, Selo Sulistiyo, Wayan Mustika","doi":"10.12720/jcm.18.7.453-461","DOIUrl":"https://doi.org/10.12720/jcm.18.7.453-461","url":null,"abstract":"Spectrum is a limited resource, so it must be used effectively. The fixed spectrum allocation method currently in operation may not sustain the growth in the network access users, which continues to increase over time. Many studies have shown that the spectrum deficiency problem can be solved with cognitive radio network (CRN) technology. CRN allows flexible spectrum utilization. Spectrum handoff is one of the fundamental prerequisites for dynamic spectrum access in cognitive radio networks. The ping-pong effect is one of the problems caused by the frequent occurrence of unnecessary handoff spectrum. So, in CRN, the right handoff decision is needed to avoid the ping-pong effect. The proposed fuzzy system carries the concept of a fuzzy tree that uses two fuzzy inference systems (FIS), which work in two stages, namely FIS-1 and FIS-2. In the early stages, the FIS-1 controls the secondary users (SU) power and prevents interference with the primary users (PU). FIS-2 is used to execute precise spectrum handoff decisions. The test results show that the amount of handoff spectrum has decreased by up to 43 % compared to other methods, which are only 60 %. This results in a decrease of 16.67% from the previous method. Thus, the ping-pong effect can be minimized with the right handoff decisions.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"45 1","pages":"453-461"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83237575","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 : 2023-07-01DOI: 10.12720/jcm.18.7.435-445
W. Pamungkas, A. F. Isnawati, Haryadi Teguh Pribadi
The nature of wireless communication channels evolves throughout time. Depending on the channel model, wireless communication channels can also be affected by a number of key factors. In the Correlated Double Ring (CDR) wireless channel model, the channel gain parameters are affected by the movement of vehicles on the transmitter and receiver sides as well as the amount of scatterers surrounding the transmitter and receiver. When bits are transmitted across the CDR channel using a Generalized Frequency Division Multiplexing (GFDM) multi-carrier system, the received bit will be degraded as a result of Doppler shift and multipath. To circumvent this, we use a Zero Forcing (ZF) equalizer to correct the erroneous bits on the receive side. In this study, we simulate data bits transmitted via a CDR channel at various speeds, ranging from low speed to high speed, using a GFDM multicarrier system. The ZF equalization method that we propose to overcome the higher Doppler frequency on a high-speed CDR channel of 95 m/s with the scatterer of 8 has been demonstrated to increase Bit Error Rate (BER) performance in comparison to the emergence of a ZF equalization scheme. In order to counteract the vast number of up to 16 multipaths on CDR channels, the ZF equalization approach can improve the BER performance at 95 m/s when compared to when it is not employed. On the Rician CDR channel, the ZF equalization algorithm can efficiently overcome the highly significant Doppler effect and multipath fading.
{"title":"GFDM Zero Forcing Equalizer for Large Doppler Shift in Correlated Double Ring Channel Models","authors":"W. Pamungkas, A. F. Isnawati, Haryadi Teguh Pribadi","doi":"10.12720/jcm.18.7.435-445","DOIUrl":"https://doi.org/10.12720/jcm.18.7.435-445","url":null,"abstract":"The nature of wireless communication channels evolves throughout time. Depending on the channel model, wireless communication channels can also be affected by a number of key factors. In the Correlated Double Ring (CDR) wireless channel model, the channel gain parameters are affected by the movement of vehicles on the transmitter and receiver sides as well as the amount of scatterers surrounding the transmitter and receiver. When bits are transmitted across the CDR channel using a Generalized Frequency Division Multiplexing (GFDM) multi-carrier system, the received bit will be degraded as a result of Doppler shift and multipath. To circumvent this, we use a Zero Forcing (ZF) equalizer to correct the erroneous bits on the receive side. In this study, we simulate data bits transmitted via a CDR channel at various speeds, ranging from low speed to high speed, using a GFDM multicarrier system. The ZF equalization method that we propose to overcome the higher Doppler frequency on a high-speed CDR channel of 95 m/s with the scatterer of 8 has been demonstrated to increase Bit Error Rate (BER) performance in comparison to the emergence of a ZF equalization scheme. In order to counteract the vast number of up to 16 multipaths on CDR channels, the ZF equalization approach can improve the BER performance at 95 m/s when compared to when it is not employed. On the Rician CDR channel, the ZF equalization algorithm can efficiently overcome the highly significant Doppler effect and multipath fading.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"25 1","pages":"435-445"},"PeriodicalIF":0.0,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83391614","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}
Building on recent research that challenges the notion that norm violations in online discussions are inherently detrimental, this study relies on a distinction between incivil and intolerant user comments and investigates how online users perceive and react to these distinct forms of antinormative discourse online. Conducting a preregistered factorial survey experiment with a nationally representative sample of n = 964 German online users, we presented participants with manipulated user comments that included statements associated with incivil (profanity; attacks toward arguments) and intolerant discourse (offensive stereotyping; violent threats). The results show that intolerant statements consistently lead to higher perceptions of offensiveness and harm to society as well as an increased intention to delete the comment containing the statement, whereas incivil statements do not. An exploratory multiverse analysis further suggests that these effects remain robust across a variety of analytical decisions.
{"title":"Differential perceptions of and reactions to incivil and intolerant user comments","authors":"A. Kümpel, Julian Unkel","doi":"10.1093/jcmc/zmad018","DOIUrl":"https://doi.org/10.1093/jcmc/zmad018","url":null,"abstract":"\u0000 Building on recent research that challenges the notion that norm violations in online discussions are inherently detrimental, this study relies on a distinction between incivil and intolerant user comments and investigates how online users perceive and react to these distinct forms of antinormative discourse online. Conducting a preregistered factorial survey experiment with a nationally representative sample of n = 964 German online users, we presented participants with manipulated user comments that included statements associated with incivil (profanity; attacks toward arguments) and intolerant discourse (offensive stereotyping; violent threats). The results show that intolerant statements consistently lead to higher perceptions of offensiveness and harm to society as well as an increased intention to delete the comment containing the statement, whereas incivil statements do not. An exploratory multiverse analysis further suggests that these effects remain robust across a variety of analytical decisions.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"33 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79445615","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}
How credulous are we when engaging information on social media? Addressing this question, this article aims to understand how individuals’ epistemic vigilance, a set of cognitive mechanisms that comprise our system of precaution in social interactions, may operate and fall short. Reporting findings from two survey experiments (Study 1, N = 413; Study 2, N = 392), we show that participants tended to be skeptical toward social media news, were reasonably successful in identifying true news, and reported a tendency to share true rather than false news. In one study, social endorsement enticed a higher accuracy rating of news posts. In both studies, people judged attitudinally congruent news posts as being more accurate and reported a higher likelihood to share them. Individuals’ propensity to reflective thinking measured by cognitive reflection test potentially operated as a restraint on sharing inaccurate information and bolstered veracity anchoring in their information engagement.
{"title":"Facts are hard to come by: discerning and sharing factual information on social media","authors":"Fangjing Tu, Z. Pan, Xinle Jia","doi":"10.1093/jcmc/zmad021","DOIUrl":"https://doi.org/10.1093/jcmc/zmad021","url":null,"abstract":"\u0000 How credulous are we when engaging information on social media? Addressing this question, this article aims to understand how individuals’ epistemic vigilance, a set of cognitive mechanisms that comprise our system of precaution in social interactions, may operate and fall short. Reporting findings from two survey experiments (Study 1, N = 413; Study 2, N = 392), we show that participants tended to be skeptical toward social media news, were reasonably successful in identifying true news, and reported a tendency to share true rather than false news. In one study, social endorsement enticed a higher accuracy rating of news posts. In both studies, people judged attitudinally congruent news posts as being more accurate and reported a higher likelihood to share them. Individuals’ propensity to reflective thinking measured by cognitive reflection test potentially operated as a restraint on sharing inaccurate information and bolstered veracity anchoring in their information engagement.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"216 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86852212","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}
Cross-cutting discussion is the foundation of deliberative democracy. However, previous research has reported inconsistent results regarding the effects of exposure to dissimilar perspectives on political polarization. This study aims to extend the literature by exploring how cross-cutting discussion influences affective polarization through unfriending and how this indirect effect is contingent upon exposure to incivility. The study analyzes panel data from a two-wave online survey conducted in South Korea (N = 890). The results show a significantly positive indirect effect of unfriending, suggesting that cross-cutting discussion further reinforces affective polarization via unfriending. Furthermore, the study identifies the boundary conditions for this mediating mechanism, showing that the mediated relationship of cross-cutting discussion on affective polarization via unfriending is stronger for those who are more exposed to incivility on social media.
{"title":"The effects of disagreement and unfriending on political polarization: a moderated-mediation model of cross-cutting discussion on affective polarization via unfriending contingent upon exposure to incivility","authors":"Han Lin, Yi Wang, J. Lee, Yonghwan Kim","doi":"10.1093/jcmc/zmad022","DOIUrl":"https://doi.org/10.1093/jcmc/zmad022","url":null,"abstract":"\u0000 Cross-cutting discussion is the foundation of deliberative democracy. However, previous research has reported inconsistent results regarding the effects of exposure to dissimilar perspectives on political polarization. This study aims to extend the literature by exploring how cross-cutting discussion influences affective polarization through unfriending and how this indirect effect is contingent upon exposure to incivility. The study analyzes panel data from a two-wave online survey conducted in South Korea (N = 890). The results show a significantly positive indirect effect of unfriending, suggesting that cross-cutting discussion further reinforces affective polarization via unfriending. Furthermore, the study identifies the boundary conditions for this mediating mechanism, showing that the mediated relationship of cross-cutting discussion on affective polarization via unfriending is stronger for those who are more exposed to incivility on social media.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77298283","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 : 2023-06-01DOI: 10.12720/jcm.18.6.346-356
B. Dey, Sivaji Bandyopadhyay, Sukumar Nandi
One of the massive machine type communication (mMTC) applications for monitoring and sensing in 5G cellular network is the Internet of Things (IoT) based wireless sensor network (WSN). Non uniform battery usage by the nodes in these networks often results in creating energy holes or voids in the network making the network disconnected. An effective solution is to deploy multiple mobile nodes throughout the network, however finding optimal path for these mobile nodes is reported to be an NP hard problem. This paper proposes MAACH (Mobility Assisted Adaptive Clustering Hierarchy), an efficient mobility assisted clustering and routing framework for IoT based sensor network in 5G and beyond. Also, an elaborate method to calculate the exact path optimally for multiple mobile nodes is presented to alleviate non uniform energy dissipation of the sensing nodes. Simulation results show that our algorithm effectively finds the optimal trajectory of multiple mobile nodes in a distribute manner and also improves network stability period by 60-70% and the network lifetime by 70-90% across multiple network deployments.
{"title":"Mobility Assisted Adaptive Clustering Hierarchy for IoT Based Sensor Networks in 5G and Beyond","authors":"B. Dey, Sivaji Bandyopadhyay, Sukumar Nandi","doi":"10.12720/jcm.18.6.346-356","DOIUrl":"https://doi.org/10.12720/jcm.18.6.346-356","url":null,"abstract":"One of the massive machine type communication (mMTC) applications for monitoring and sensing in 5G cellular network is the Internet of Things (IoT) based wireless sensor network (WSN). Non uniform battery usage by the nodes in these networks often results in creating energy holes or voids in the network making the network disconnected. An effective solution is to deploy multiple mobile nodes throughout the network, however finding optimal path for these mobile nodes is reported to be an NP hard problem. This paper proposes MAACH (Mobility Assisted Adaptive Clustering Hierarchy), an efficient mobility assisted clustering and routing framework for IoT based sensor network in 5G and beyond. Also, an elaborate method to calculate the exact path optimally for multiple mobile nodes is presented to alleviate non uniform energy dissipation of the sensing nodes. Simulation results show that our algorithm effectively finds the optimal trajectory of multiple mobile nodes in a distribute manner and also improves network stability period by 60-70% and the network lifetime by 70-90% across multiple network deployments.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"25 1","pages":"346-356"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87306716","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 : 2023-06-01DOI: 10.12720/jcm.18.6.357-368
M. I. Nashiruddin, Pinasthika Aulia Fadhila, N. Adriansyah, M. Nugraha, Putri Rahmawati
The implementation of mobile cellular networks of the fourth generation, known as 4G Long Term Evolution-Advanced (4G LTE-A), is accelerating throughout the globe. Thus, the number of users in any given area is bound to rise with technological advancements. However, internet connec-tivity has become challenging in Indonesia, particularly in the dense urban area of Central Jakarta, due to network conges-tion caused by the region’s enormous population of users and limited existing frequency. Therefore, this research aims to utilize the 2100 MHz frequency band as an additional fre-quency for the 4G LTE-A network in the dense urban Cen-tral Jakarta region. Furthermore, this research employs a techno-economic assessment of the deployment of 4G LTE-A with and without carrier aggregation (CA). The purpose is to see if expanding the 4G LTE-A network in the study area by adding the 2100 MHz frequency and utilizing the CA method is feasible and beneficial. According to the results, using the CA technique leads to fewer eNodeB requirements in the dense urban area of Central Jakarta than without the CA technique. Furthermore, through network simulation soft-ware, Forsk Atoll, good quality of the Key Performance Indi-cators (KPI) is obtained. In addition, based on the business perspective, this research acquired good Net Present Value (NPV), and the Internal Rate of Return (IRR) values are ob-tained, with returns on capital in the range of two to three years. Overall, these findings indicate that deploying 4G LTE-A technology in the planning region using 2100 MHz as an additional frequency with the CA technique is feasible and beneficial for cellular operators.
{"title":"Implementing Carrier Aggregation on 4G Long Term Evolution-Advanced Network in a Dense Urban Area: A Techno-Economic Assessment","authors":"M. I. Nashiruddin, Pinasthika Aulia Fadhila, N. Adriansyah, M. Nugraha, Putri Rahmawati","doi":"10.12720/jcm.18.6.357-368","DOIUrl":"https://doi.org/10.12720/jcm.18.6.357-368","url":null,"abstract":"The implementation of mobile cellular networks of the fourth generation, known as 4G Long Term Evolution-Advanced (4G LTE-A), is accelerating throughout the globe. Thus, the number of users in any given area is bound to rise with technological advancements. However, internet connec-tivity has become challenging in Indonesia, particularly in the dense urban area of Central Jakarta, due to network conges-tion caused by the region’s enormous population of users and limited existing frequency. Therefore, this research aims to utilize the 2100 MHz frequency band as an additional fre-quency for the 4G LTE-A network in the dense urban Cen-tral Jakarta region. Furthermore, this research employs a techno-economic assessment of the deployment of 4G LTE-A with and without carrier aggregation (CA). The purpose is to see if expanding the 4G LTE-A network in the study area by adding the 2100 MHz frequency and utilizing the CA method is feasible and beneficial. According to the results, using the CA technique leads to fewer eNodeB requirements in the dense urban area of Central Jakarta than without the CA technique. Furthermore, through network simulation soft-ware, Forsk Atoll, good quality of the Key Performance Indi-cators (KPI) is obtained. In addition, based on the business perspective, this research acquired good Net Present Value (NPV), and the Internal Rate of Return (IRR) values are ob-tained, with returns on capital in the range of two to three years. Overall, these findings indicate that deploying 4G LTE-A technology in the planning region using 2100 MHz as an additional frequency with the CA technique is feasible and beneficial for cellular operators.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"39 1","pages":"357-368"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75025022","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 : 2023-06-01DOI: 10.12720/jcm.18.6.377-384
J. Salawa, E. Mwangi, N. Mvungi
Due to scarcity of bandwidth available for sound broadcasting, Digital sound broadcasting Technology is emerging to be the Technology of resort in sound broadcasting industry towards replacing the analogue sound broadcasting currently dominated by FM Radio. There are many digital sound broadcasting systems being proposed with different performance and bandwidth efficiency. Static delays are artificial delays intentionally introduced at each Transmitter in order to minimize interference in a Single Frequency Network (SFN). In this paper, we have looked at the Terrestrial digital audio broadcasting (T-DAB) system specifically to optimize its final SFN coverage by finding an optimal set of static delays for transmitters. For the sake of simulation, hexagonal model of transmitters operating under Single Frequency Network (SFN) was used. The aim of this study is to maximize SFN coverage by using optimal set of artificial static delays, Particle Swarm Optimization (PSO) have strong ability in finding the global optimistic result while Stimulated Annealing (SA) algorithm has a strong ability to find the local Optimistic result and therefore based on their unique strength, these methods were selected so that our study can have a good comparison in terms of coverage by using both global and local optimistic results. We report the increase of coverage by 1.12% and 2.38% using Simulated Annealing and Particle Swarm Optimization technique respectively.
{"title":"Coverage Optimization of Eureka Digital Sound Broadcasting Single Frequency Network Using Simulated Annealing and Particle Swarm Optimization","authors":"J. Salawa, E. Mwangi, N. Mvungi","doi":"10.12720/jcm.18.6.377-384","DOIUrl":"https://doi.org/10.12720/jcm.18.6.377-384","url":null,"abstract":"Due to scarcity of bandwidth available for sound broadcasting, Digital sound broadcasting Technology is emerging to be the Technology of resort in sound broadcasting industry towards replacing the analogue sound broadcasting currently dominated by FM Radio. There are many digital sound broadcasting systems being proposed with different performance and bandwidth efficiency. Static delays are artificial delays intentionally introduced at each Transmitter in order to minimize interference in a Single Frequency Network (SFN). In this paper, we have looked at the Terrestrial digital audio broadcasting (T-DAB) system specifically to optimize its final SFN coverage by finding an optimal set of static delays for transmitters. For the sake of simulation, hexagonal model of transmitters operating under Single Frequency Network (SFN) was used. The aim of this study is to maximize SFN coverage by using optimal set of artificial static delays, Particle Swarm Optimization (PSO) have strong ability in finding the global optimistic result while Stimulated Annealing (SA) algorithm has a strong ability to find the local Optimistic result and therefore based on their unique strength, these methods were selected so that our study can have a good comparison in terms of coverage by using both global and local optimistic results. We report the increase of coverage by 1.12% and 2.38% using Simulated Annealing and Particle Swarm Optimization technique respectively.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"100 1","pages":"377-384"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80938066","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 : 2023-06-01DOI: 10.12720/jcm.18.6.391-397
A. E. Jayati, Agus Margiantono
Next-generation wireless systems use the non-orthogonal modulation technique known as generalized frequency division multiplexing (GFDM). The nonlinearity of the high-power amplifier (HPA) greatly affects the performance of the wireless system. Without phase distortion and only amplitude distortion in the GFDM system using HPA Model Rapp. The effects of nonlinear distortion that occur involve distortion of the amplitude, signal constellation distribution, and spectral distribution. There are two contributions to this paper. First, the impact of HPA Model Rapp's nonlinear distortion on the GFDM system in the AWGN (additive white Gaussian noise) and Rayleigh channels was investigated. The simplicity of this model is the reason it was picked and has an AM/AM (amplitude modulation/amplitude modulation) curve. Second, the linearization of HPA with the use of a predistorter method in GFDM systems has been proposed. The nonlinear distortion impact of HPA can be mitigated by this predistorter. This technique is implemented in the transmitter section. The system performance investigated is determined by a bit error rate (BER) analysis, a constellation diagram, and a spectrum analysis. HPA generates a 55 dB rise in out-of-band (OOB) in the signal spectrum. The HPA effect was successfully compensated for by a 55 dB decrease in the OOB value of the predistorter system.
{"title":"Predistorter for Nonlinear Distortion Mitigation in GFDM Systems","authors":"A. E. Jayati, Agus Margiantono","doi":"10.12720/jcm.18.6.391-397","DOIUrl":"https://doi.org/10.12720/jcm.18.6.391-397","url":null,"abstract":"Next-generation wireless systems use the non-orthogonal modulation technique known as generalized frequency division multiplexing (GFDM). The nonlinearity of the high-power amplifier (HPA) greatly affects the performance of the wireless system. Without phase distortion and only amplitude distortion in the GFDM system using HPA Model Rapp. The effects of nonlinear distortion that occur involve distortion of the amplitude, signal constellation distribution, and spectral distribution. There are two contributions to this paper. First, the impact of HPA Model Rapp's nonlinear distortion on the GFDM system in the AWGN (additive white Gaussian noise) and Rayleigh channels was investigated. The simplicity of this model is the reason it was picked and has an AM/AM (amplitude modulation/amplitude modulation) curve. Second, the linearization of HPA with the use of a predistorter method in GFDM systems has been proposed. The nonlinear distortion impact of HPA can be mitigated by this predistorter. This technique is implemented in the transmitter section. The system performance investigated is determined by a bit error rate (BER) analysis, a constellation diagram, and a spectrum analysis. HPA generates a 55 dB rise in out-of-band (OOB) in the signal spectrum. The HPA effect was successfully compensated for by a 55 dB decrease in the OOB value of the predistorter system.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"1 1","pages":"391-397"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90405292","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 : 2023-06-01DOI: 10.12720/jcm.18.6.385-390
Yuki Iyoda, Kentaro Kobayashi, W. Chujo
This paper studies a visible light communication (VLC) system using a digital signage and an image sensor. The authors have focused on the demodulation part of the communication system, which modulates data signals without disturbing the visual information on the digital signage, and have proposed a novel concept that uses machine learning to demodulate the data signals from images received by the image sensor. However, it has not been fully clarified which parameters of the training images contribute to the performance of the machine learningbased demodulation. This paper extends the convolutional neural network (CNN)-based demodulation method and clarifies how much the number of parallelized data signals and the number of patterns of data signals in the training images contribute to the demodulation performance. The results show that the performance improves with the number of parallelized data signals in the training images, and that half of the signal patterns are sufficient for learning.
{"title":"Effects of Training Images on CNN-Based Demodulation for Digital Signage and Image Sensor-Based VLC","authors":"Yuki Iyoda, Kentaro Kobayashi, W. Chujo","doi":"10.12720/jcm.18.6.385-390","DOIUrl":"https://doi.org/10.12720/jcm.18.6.385-390","url":null,"abstract":"This paper studies a visible light communication (VLC) system using a digital signage and an image sensor. The authors have focused on the demodulation part of the communication system, which modulates data signals without disturbing the visual information on the digital signage, and have proposed a novel concept that uses machine learning to demodulate the data signals from images received by the image sensor. However, it has not been fully clarified which parameters of the training images contribute to the performance of the machine learningbased demodulation. This paper extends the convolutional neural network (CNN)-based demodulation method and clarifies how much the number of parallelized data signals and the number of patterns of data signals in the training images contribute to the demodulation performance. The results show that the performance improves with the number of parallelized data signals in the training images, and that half of the signal patterns are sufficient for learning.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"1 1","pages":"385-390"},"PeriodicalIF":0.0,"publicationDate":"2023-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89543804","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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