Pub Date : 2023-04-01DOI: 10.12720/jcm.18.4.215-220.
G. Hussain, Husam A. Wahhab, Y. Harbi
Orthogonal Frequency Division Multiplexing (OFDM) technique is widely adopted for broadband Forth Generation (4G) wireless communication systems at present, owing to its ability to combat multi-path interference. Nevertheless, it suffers from a large Peak to Average Power Ratio (PAPR) and Out Of Band Emission (OOBE), making it unsuitable for a high-speed transmission system. On the other hand, the Filtered-OFDM (f-OFDM) system is suggested to overcome the traditional OFDM system's disadvantages and maintain its advantages. Nowadays, the developments and growing communications systems are rapid, especially on their applications such as wireless networks, internet, satellite communications, mobile telephony, etc. This increases the demand for raising the bit rates with decreasing power consumption and the bit error rates (BER). In this paper, Hamming codes are proposed to improve the f-OFDM system performance, while the presence of the subband filter in system architecture could decrease the values of OOBE than the familiar OFDM system. The outcomes showed that utilizing interleaver with Hamming code considerably improves the proposed system performance, while the OOBE values were lower than the conventional OFDM system.
{"title":"Filtered OFDM System Improvement Using Hamming Code","authors":"G. Hussain, Husam A. Wahhab, Y. Harbi","doi":"10.12720/jcm.18.4.215-220.","DOIUrl":"https://doi.org/10.12720/jcm.18.4.215-220.","url":null,"abstract":"Orthogonal Frequency Division Multiplexing (OFDM) technique is widely adopted for broadband Forth Generation (4G) wireless communication systems at present, owing to its ability to combat multi-path interference. Nevertheless, it suffers from a large Peak to Average Power Ratio (PAPR) and Out Of Band Emission (OOBE), making it unsuitable for a high-speed transmission system. On the other hand, the Filtered-OFDM (f-OFDM) system is suggested to overcome the traditional OFDM system's disadvantages and maintain its advantages. Nowadays, the developments and growing communications systems are rapid, especially on their applications such as wireless networks, internet, satellite communications, mobile telephony, etc. This increases the demand for raising the bit rates with decreasing power consumption and the bit error rates (BER). In this paper, Hamming codes are proposed to improve the f-OFDM system performance, while the presence of the subband filter in system architecture could decrease the values of OOBE than the familiar OFDM system. The outcomes showed that utilizing interleaver with Hamming code considerably improves the proposed system performance, while the OOBE values were lower than the conventional OFDM system.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"394 ","pages":"215"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91461496","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 : 2023-04-01DOI: 10.12720/jcm.18.4.221-227
Abdelilah El ihyaoui, M. Youssefi, A. Mouhsen, Abdelhafid ELfarnane
The Vehicle Ad Hoc Network (VANET) has been widely used to improve road safety and comfort. However, security is a big challenge for VANET, in fact, vehicle networks have the same security problems as traditional computer networks, hackers can introduce a dangerous threat to security. The issue of security in VANET networks has attracted a lot of attention from researchers to propose several security models. However, validation and performance testing of proposed solutions in a real or simulated environment remains a difficult problem. In this work, we present VANETcloudSim, it’s a new cloud platform simulator for VANET security solutions. The proposed simulator allows running stress and tests performance, In contrast to the majority of existing simulators, the proposed platform evaluates the performance and limitations of security models, through the execution of performance and stress tests, it is simple to deploy, robust and efficient. This simulator can be deployed on users' local computers or on the cloud platform.
{"title":"Evaluate the Security Models Performances and Limitations of the Vehicular Network VANETcloudSim","authors":"Abdelilah El ihyaoui, M. Youssefi, A. Mouhsen, Abdelhafid ELfarnane","doi":"10.12720/jcm.18.4.221-227","DOIUrl":"https://doi.org/10.12720/jcm.18.4.221-227","url":null,"abstract":"The Vehicle Ad Hoc Network (VANET) has been widely used to improve road safety and comfort. However, security is a big challenge for VANET, in fact, vehicle networks have the same security problems as traditional computer networks, hackers can introduce a dangerous threat to security. The issue of security in VANET networks has attracted a lot of attention from researchers to propose several security models. However, validation and performance testing of proposed solutions in a real or simulated environment remains a difficult problem. In this work, we present VANETcloudSim, it’s a new cloud platform simulator for VANET security solutions. The proposed simulator allows running stress and tests performance, In contrast to the majority of existing simulators, the proposed platform evaluates the performance and limitations of security models, through the execution of performance and stress tests, it is simple to deploy, robust and efficient. This simulator can be deployed on users' local computers or on the cloud platform.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"1445 1","pages":"221-227"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77708762","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 : 2023-04-01DOI: 10.12720/jcm.18.4.207-214
N. Nasaruddin, E. Elizar, Afdhal Afdhal
Channel conditions strongly influence the performance of the wireless communication system. Fading is one of the main problems caused by signal propagation via various paths. Recently, cooperative communication systems have been extensively studied to overcome this problem. However, the power consumption in the system relaying information to the destination increases, shortening the network's life. Therefore, this paper analyzes the impact of three Raleigh and Rician fading channel scenarios on cooperative communication performance in which a relay uses energy harvesting based on power splitting (EH-PS). The three scenarios are Rayleigh-Rayleigh fading (I), Rician- Rayleigh fading (II), and Rician-Rician fading (III). Subsequently, the throughput performance and energy efficiency are evaluated based on the maximum power splitting (PS) ratio. The simulation results indicate that the PS ratio in scenario III is higher than in scenarios I and II. Thus, the Rician fading channel can accumulate more energy in the relay due to the line-of-sight path between the source and the relay. Hence, scenario III's throughput and energy efficiency are higher than the other scenarios. The energy efficiency for scenario III is 33.08% and 12.14% higher than scenarios I and II, respectively. Therefore, the EH-PS cooperative communication system with the Rician fading channels has the highest throughput and is promising for future 5G technology.
{"title":"Impact of Fading Channel to Energy Harvesting Relay on Cooperative Communication Systems","authors":"N. Nasaruddin, E. Elizar, Afdhal Afdhal","doi":"10.12720/jcm.18.4.207-214","DOIUrl":"https://doi.org/10.12720/jcm.18.4.207-214","url":null,"abstract":"Channel conditions strongly influence the performance of the wireless communication system. Fading is one of the main problems caused by signal propagation via various paths. Recently, cooperative communication systems have been extensively studied to overcome this problem. However, the power consumption in the system relaying information to the destination increases, shortening the network's life. Therefore, this paper analyzes the impact of three Raleigh and Rician fading channel scenarios on cooperative communication performance in which a relay uses energy harvesting based on power splitting (EH-PS). The three scenarios are Rayleigh-Rayleigh fading (I), Rician- Rayleigh fading (II), and Rician-Rician fading (III). Subsequently, the throughput performance and energy efficiency are evaluated based on the maximum power splitting (PS) ratio. The simulation results indicate that the PS ratio in scenario III is higher than in scenarios I and II. Thus, the Rician fading channel can accumulate more energy in the relay due to the line-of-sight path between the source and the relay. Hence, scenario III's throughput and energy efficiency are higher than the other scenarios. The energy efficiency for scenario III is 33.08% and 12.14% higher than scenarios I and II, respectively. Therefore, the EH-PS cooperative communication system with the Rician fading channels has the highest throughput and is promising for future 5G technology.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"1 1","pages":"207-214"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90864179","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 : 2023-04-01DOI: 10.12720/jcm.18.4.250-255
Hyuk-Je Kim, I. Lee
Frequency sharing problems may occur between neighboring networks when multiple operators build 5G private networks within a specific region. The interference between time division duplex (TDD) 5G private networks depends on various factors, such as frequency channels, synchronization, and building entry loss (BEL). In this study, we propose separation distances at which two 5G private networks in close proximity can coexist. The amount of interference according to the separation distance between the two 5G private networks was simulated by the Monte Carlo (MC) method. When the two networks operated in an outdoor environment and had different channels, there was a minimum interference effect even if the cell radii of the two networks overlap. However, the separation distance between networks using the same channel was simulated to be approximately 500 m. The TDD synchronization of two networks using the same channel reduced the separation distance to approximately 100 m. The additional radio wave attenuation by the BEL reduced the amount of interference, allowing frequency coexistence between networks even within the cell radii.
{"title":"Separation Distance for Frequency Coexistence between Unsynchronized Time Division Duplex 5G Private Networks at 4.7 GHz","authors":"Hyuk-Je Kim, I. Lee","doi":"10.12720/jcm.18.4.250-255","DOIUrl":"https://doi.org/10.12720/jcm.18.4.250-255","url":null,"abstract":"Frequency sharing problems may occur between neighboring networks when multiple operators build 5G private networks within a specific region. The interference between time division duplex (TDD) 5G private networks depends on various factors, such as frequency channels, synchronization, and building entry loss (BEL). In this study, we propose separation distances at which two 5G private networks in close proximity can coexist. The amount of interference according to the separation distance between the two 5G private networks was simulated by the Monte Carlo (MC) method. When the two networks operated in an outdoor environment and had different channels, there was a minimum interference effect even if the cell radii of the two networks overlap. However, the separation distance between networks using the same channel was simulated to be approximately 500 m. The TDD synchronization of two networks using the same channel reduced the separation distance to approximately 100 m. The additional radio wave attenuation by the BEL reduced the amount of interference, allowing frequency coexistence between networks even within the cell radii.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"35 1","pages":"250-255"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81132130","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 : 2023-04-01DOI: 10.12720/jcm.18.4.256-266
Jonathan Shilling, Chao Chen
In-band full-duplex (IBFD) technology allows simultaneous transmission and reception in the same frequency band to boost spectral efficiency. However, selfinterference, introduced by transmitter-to-receiver leakage, poses the biggest obstacle to the realization of IBFD. Altogether IBFD radio performance and effective network throughput are directly correlated with the amount of energy suppressed by self-interference cancellation (SIC). In this work a model of an IBFD transceiver, featuring an adaptive, analog-domain, tapped-branch self-interference canceller, was developed to evaluate the inimical effects attributable to the various noise and nonlinear distortions of the simulated transceiver components. Results of the simulation show that noise incursions and nonlinearity in the transmission channel produced a negligible effect on the overall cancellation performance. However, the effectiveness of the cancellation hardware is highly dependent on the level of intrinsic nonlinearity within the canceller’s own components. Consideration of these non-ideal characteristics should be an essential part of analog SIC design to prevent any intrinsic limitations on the cancellation performance.
{"title":"Evaluating Analog Self-Interference Cancellation for In-Band Full-Duplex Wireless Communication","authors":"Jonathan Shilling, Chao Chen","doi":"10.12720/jcm.18.4.256-266","DOIUrl":"https://doi.org/10.12720/jcm.18.4.256-266","url":null,"abstract":"In-band full-duplex (IBFD) technology allows simultaneous transmission and reception in the same frequency band to boost spectral efficiency. However, selfinterference, introduced by transmitter-to-receiver leakage, poses the biggest obstacle to the realization of IBFD. Altogether IBFD radio performance and effective network throughput are directly correlated with the amount of energy suppressed by self-interference cancellation (SIC). In this work a model of an IBFD transceiver, featuring an adaptive, analog-domain, tapped-branch self-interference canceller, was developed to evaluate the inimical effects attributable to the various noise and nonlinear distortions of the simulated transceiver components. Results of the simulation show that noise incursions and nonlinearity in the transmission channel produced a negligible effect on the overall cancellation performance. However, the effectiveness of the cancellation hardware is highly dependent on the level of intrinsic nonlinearity within the canceller’s own components. Consideration of these non-ideal characteristics should be an essential part of analog SIC design to prevent any intrinsic limitations on the cancellation performance.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"402 1","pages":"256-266"},"PeriodicalIF":0.0,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86830908","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}
Although peer production has created valuable information goods like Wikipedia, the GNU/Linux operating system, and Reddit, the majority of attempts at peer production achieve very little. In work groups and teams, coordination and social integration—manifested via dense, integrative communication networks—predict success. We hypothesize that the conditions in which new peer production communities operate make communication problems common and make coordination and integration more difficult, and that variation in the structure of project communication networks will predict project success. In this article, we measure communication networks for 999 early-stage peer production wikis. We assess whether communities displaying network markers of coordination and social integration are more productive and long-lasting. Contrary to our expectations, we find a very weak relationship between communication structure and collaborative performance. We propose that technology may serve as a partial substitute for communication in coordinating work and integrating newcomers in peer production.
{"title":"Communication networks do not predict success in attempts at peer production","authors":"Jeremy Foote, Aaron Shaw, Benjamin Mako Hill","doi":"10.1093/jcmc/zmad002","DOIUrl":"https://doi.org/10.1093/jcmc/zmad002","url":null,"abstract":"Although peer production has created valuable information goods like Wikipedia, the GNU/Linux operating system, and Reddit, the majority of attempts at peer production achieve very little. In work groups and teams, coordination and social integration—manifested via dense, integrative communication networks—predict success. We hypothesize that the conditions in which new peer production communities operate make communication problems common and make coordination and integration more difficult, and that variation in the structure of project communication networks will predict project success. In this article, we measure communication networks for 999 early-stage peer production wikis. We assess whether communities displaying network markers of coordination and social integration are more productive and long-lasting. Contrary to our expectations, we find a very weak relationship between communication structure and collaborative performance. We propose that technology may serve as a partial substitute for communication in coordinating work and integrating newcomers in peer production.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82863951","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}
Two large surveys with adult samples of Americans (N = 1,105; N = 1,035) investigated differences in perceived incivility between seven social media platforms. Perceptions of incivility were targeted, given both their inherent societal relevance and the personalized nature of each user’s platform experience. Utilizing a novel approach, observations per platform were nested within each user, facilitating disentangling user-level from platform-level factors. Study 1 demonstrated that even accounting for differences between users, perceptions vary by platform. Further, while individual users do admit to generating uncivil content themselves, self-perceptions were in contrast largely stable across platforms. Study 2 built upon Study 1 by investigating additional platform-level factors that could impact perceptions of incivility: Differences in perceived affordances between platforms were related to differences in perceptions of incivility’s prevalence. Specifically, platforms characterized by either perceived anonymity or perceived network association were in turn perceived to be more uncivil.
{"title":"Different platforms, different uses: testing the effect of platforms and individual differences on perception of incivility and self-reported uncivil behavior","authors":"Daniel J. Sude, S. Dvir-Gvirsman","doi":"10.1093/jcmc/zmac035","DOIUrl":"https://doi.org/10.1093/jcmc/zmac035","url":null,"abstract":"\u0000 Two large surveys with adult samples of Americans (N = 1,105; N = 1,035) investigated differences in perceived incivility between seven social media platforms. Perceptions of incivility were targeted, given both their inherent societal relevance and the personalized nature of each user’s platform experience. Utilizing a novel approach, observations per platform were nested within each user, facilitating disentangling user-level from platform-level factors. Study 1 demonstrated that even accounting for differences between users, perceptions vary by platform. Further, while individual users do admit to generating uncivil content themselves, self-perceptions were in contrast largely stable across platforms. Study 2 built upon Study 1 by investigating additional platform-level factors that could impact perceptions of incivility: Differences in perceived affordances between platforms were related to differences in perceptions of incivility’s prevalence. Specifically, platforms characterized by either perceived anonymity or perceived network association were in turn perceived to be more uncivil.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"77 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84651519","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}
Eugy Han, M. R. Miller, C. Deveaux, Hanseul Jun, Kristine L. Nowak, Jeffrey T. Hancock, Nilam Ram, J. Bailenson
As the metaverse expands, understanding how people use virtual reality to learn and connect is increasingly important. We used the Transformed Social Interaction paradigm (Bailenson, J. N., Beall, A. C., Loomis, J., Blascovich, J., & Turk, M. (2004). Transformed social interaction: Decoupling representation from behavior and form in collaborative virtual environments. Presence: Teleoperators and Virtual Environments , 13 (4), 428–441) to examine different avatar identities and environments over time. In Study 1 ( n ¼ 81), entitativity, presence, enjoyment, and realism increased over 8 weeks. Avatars that resembled participants increased synchrony, similarities in moment-to-moment nonverbal behaviors between participants. Moreover, self-avatars increased self-presence and realism, but decreased enjoyment, compared to uniform avatars. In Study 2 ( n ¼ 137), participants cycled through 192 unique virtual environments. As visible space increased, so did nonverbal synchrony, per- ceived restorativeness, entitativity, pleasure, arousal, self- and spatial presence, enjoyment, and realism. Outdoor environments increased perceived restorativeness and enjoyment more than indoor environments. Self-presence and realism increased over time in both studies. We dis- cuss implications of avatar appearance and environmental context on social behavior in classroom contexts over time.
随着虚拟世界的扩展，了解人们如何使用虚拟现实来学习和联系变得越来越重要。我们使用了转化的社会互动范式(Bailenson, J. N.， Beall, A. C.， Loomis, J.， Blascovich, J.， & Turk, M.， 2004)。转化的社会互动:协作虚拟环境中行为与形式的解耦表征。存在:远程操作员和虚拟环境，13(4)，428-441)来检查不同的化身身份和环境随着时间的推移。在研究1(81)中，实体性、存在感、享受感和现实性在8周内都有所增加。与参与者相似的虚拟形象增加了参与者之间即时非语言行为的同步性和相似性。此外，与统一的虚拟形象相比，自我形象增加了自我存在感和现实性，但降低了乐趣。在研究2中，参与者在192个不同的虚拟环境中循环。随着可见空间的增加，非语言同步性、知觉恢复性、实体性、愉悦、觉醒、自我和空间存在、享受和现实主义也随之增加。室外环境比室内环境更能增加人们对恢复和享受的感觉。在这两项研究中，自我存在和现实主义都随着时间的推移而增加。我们讨论了虚拟形象的外观和环境背景对课堂社会行为的影响。
{"title":"People, places, and time: a large-scale, longitudinal study of transformed avatars and environmental context in group interaction in the metaverse","authors":"Eugy Han, M. R. Miller, C. Deveaux, Hanseul Jun, Kristine L. Nowak, Jeffrey T. Hancock, Nilam Ram, J. Bailenson","doi":"10.1093/jcmc/zmac031","DOIUrl":"https://doi.org/10.1093/jcmc/zmac031","url":null,"abstract":"As the metaverse expands, understanding how people use virtual reality to learn and connect is increasingly important. We used the Transformed Social Interaction paradigm (Bailenson, J. N., Beall, A. C., Loomis, J., Blascovich, J., & Turk, M. (2004). Transformed social interaction: Decoupling representation from behavior and form in collaborative virtual environments. Presence: Teleoperators and Virtual Environments , 13 (4), 428–441) to examine different avatar identities and environments over time. In Study 1 ( n ¼ 81), entitativity, presence, enjoyment, and realism increased over 8 weeks. Avatars that resembled participants increased synchrony, similarities in moment-to-moment nonverbal behaviors between participants. Moreover, self-avatars increased self-presence and realism, but decreased enjoyment, compared to uniform avatars. In Study 2 ( n ¼ 137), participants cycled through 192 unique virtual environments. As visible space increased, so did nonverbal synchrony, per- ceived restorativeness, entitativity, pleasure, arousal, self- and spatial presence, enjoyment, and realism. Outdoor environments increased perceived restorativeness and enjoyment more than indoor environments. Self-presence and realism increased over time in both studies. We dis- cuss implications of avatar appearance and environmental context on social behavior in classroom contexts over time.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73272036","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}
The design of multiband antennas is useful for providing multiple resonance frequencies required for multiple application scenarios. However, there is a scarcity of compact-sized antennas in the 70-110 GHz band. In this regard, this paper proposes two multiband millimeter wave antennas in the W and D bands. A small-sized antenna operating at five different frequencies (penta band) with an overall dimension of 4.8 × 5.4 mm2 and resonances at 35.84 GHz, 46.07 GHz, 56.74 GHz, 81.6 GHz, and 110.09 GHz is proposed first. The second one is an array antenna from the first antenna with a size of 11.1 by 6.4 mm2 and resonances at 28.03 GHz, 36.5 GHz, 53.11 GHz, 65.98 GHz, 77.64 GHz, 89.3 GHz, 100.52 GHz, 111.74 GHz, and 122.19 GHz. Computer Simulation Technology (CST) Microwave Studio tool is used for antenna design purposes. At the two larger frequencies of 81.6 GHz and 110.09 GHz of the first antenna, (the BW, the directivity, the gain, and radiation efficiency) are (3.3 GHz, 6.486 dBi, 6.22 dB, and 94.06%), and (10.01 GHz, 8.797 dBi, 8.506 dB, and 93.52%), respectively. At 77.64 GHz, and 111.74 GHz of the array antenna, (the BW, the directivity, the gain, and radiation efficiency) are (3.73 GHz, 12.35 dBi, 10.68 dB, and 67.9%), (4.4 GHz, 15.31 dBi, 14.07 dB, and 75.23%), respectively. The advantage of the proposed antennas over the currently available 80 GHz and 110 GHz antennas is that they are compact in size while maintaining high bandwidth and gain. Hence, the proposed antennas have potential applications in satellite communications, the Internet of things, compact biomedical devices, and interferometry radars.
{"title":"Novel Multiband Millimeter Wave Antennas","authors":"A. Galib, Nayan Sarker, M. Mondal","doi":"10.12720/jcm.18.1.1-14","DOIUrl":"https://doi.org/10.12720/jcm.18.1.1-14","url":null,"abstract":"The design of multiband antennas is useful for providing multiple resonance frequencies required for multiple application scenarios. However, there is a scarcity of compact-sized antennas in the 70-110 GHz band. In this regard, this paper proposes two multiband millimeter wave antennas in the W and D bands. A small-sized antenna operating at five different frequencies (penta band) with an overall dimension of 4.8 × 5.4 mm2 and resonances at 35.84 GHz, 46.07 GHz, 56.74 GHz, 81.6 GHz, and 110.09 GHz is proposed first. The second one is an array antenna from the first antenna with a size of 11.1 by 6.4 mm2 and resonances at 28.03 GHz, 36.5 GHz, 53.11 GHz, 65.98 GHz, 77.64 GHz, 89.3 GHz, 100.52 GHz, 111.74 GHz, and 122.19 GHz. Computer Simulation Technology (CST) Microwave Studio tool is used for antenna design purposes. At the two larger frequencies of 81.6 GHz and 110.09 GHz of the first antenna, (the BW, the directivity, the gain, and radiation efficiency) are (3.3 GHz, 6.486 dBi, 6.22 dB, and 94.06%), and (10.01 GHz, 8.797 dBi, 8.506 dB, and 93.52%), respectively. At 77.64 GHz, and 111.74 GHz of the array antenna, (the BW, the directivity, the gain, and radiation efficiency) are (3.73 GHz, 12.35 dBi, 10.68 dB, and 67.9%), (4.4 GHz, 15.31 dBi, 14.07 dB, and 75.23%), respectively. The advantage of the proposed antennas over the currently available 80 GHz and 110 GHz antennas is that they are compact in size while maintaining high bandwidth and gain. Hence, the proposed antennas have potential applications in satellite communications, the Internet of things, compact biomedical devices, and interferometry radars.","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"31 1","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85717176","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}
Joshua Baldwin, Joomi Lee, Allan D. Tate, Christian D. Okitondo, Kyle Johnsen, Michael D. Schmidt, Stephen L. Rathbun, Eric Novotny, Sun Joo Grace Ahn
{"title":"Mediating social support through sensor-based technologies for children's health behavior change","authors":"Joshua Baldwin, Joomi Lee, Allan D. Tate, Christian D. Okitondo, Kyle Johnsen, Michael D. Schmidt, Stephen L. Rathbun, Eric Novotny, Sun Joo Grace Ahn","doi":"10.1093/jcmc/zmad011","DOIUrl":"https://doi.org/10.1093/jcmc/zmad011","url":null,"abstract":"","PeriodicalId":14832,"journal":{"name":"J. Comput. Mediat. Commun.","volume":"170 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86048677","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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