Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798643
Toshiro Nunome, Kenya Mizutani
This paper evaluates subjective QoE of audio and video transmission over Wireless LAN with a reliable groupcast mechanism and a rate-adaptation mechanism. As a reliable groupcast method, we employ LBP (Leader-Based Protocol) without RTS/CTS. For a rate-adaptation mechanism, we utilize ARF (Auto Rate Fallback). We compare the joint method to groupcast without retransmission and IEEE 802.11 GCR Unsolicited Retry with a fixed rate. Computer simulation with ns-3 is carried out. We then assess QoE through a subjective experiment. The result shows that the joint method enhances QoE under various conditions.
{"title":"The Joint Effect of Wireless LAN Reliable Groupcast and a Rate-Adaptation Mechanism on QoE of Audio and Video Transmission","authors":"Toshiro Nunome, Kenya Mizutani","doi":"10.1109/ICT.2019.8798643","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798643","url":null,"abstract":"This paper evaluates subjective QoE of audio and video transmission over Wireless LAN with a reliable groupcast mechanism and a rate-adaptation mechanism. As a reliable groupcast method, we employ LBP (Leader-Based Protocol) without RTS/CTS. For a rate-adaptation mechanism, we utilize ARF (Auto Rate Fallback). We compare the joint method to groupcast without retransmission and IEEE 802.11 GCR Unsolicited Retry with a fixed rate. Computer simulation with ns-3 is carried out. We then assess QoE through a subjective experiment. The result shows that the joint method enhances QoE under various conditions.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116798139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798859
Xuanmei Qin, Yongfeng Huang, Zhen Yang, Xing Li
Attribute-based encryption describes the access policy with the attribute information of users. In practice, attributes usually have a certain lifespan. The existing time-based access control methods directly relate attribute keys to time. Thus, under the constraint of fine-grained time, when the attribute expires, the update of key and policy adds a large additional burden to the data user and owner. In this paper, we propose a dynamic attribute-based access control scheme to set a fine-grained valid time period for each attribute, which not only facilitates dynamic data sharing, but also enables flexible attribute revocation. We use smart contract to set valid time period for attributes. It provides smart management on users' attributes and avoids the waiting time of CSP caused by manual operations. We also introduce trapdoor that are indirectly related to time and proxy decryption method to reduce computational cost on data owners and users. Extensive security and performance analysis shows the security strength and effectiveness of the proposed scheme.
{"title":"An access control scheme with fine-grained time constrained attributes based on smart contract and trapdoor","authors":"Xuanmei Qin, Yongfeng Huang, Zhen Yang, Xing Li","doi":"10.1109/ICT.2019.8798859","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798859","url":null,"abstract":"Attribute-based encryption describes the access policy with the attribute information of users. In practice, attributes usually have a certain lifespan. The existing time-based access control methods directly relate attribute keys to time. Thus, under the constraint of fine-grained time, when the attribute expires, the update of key and policy adds a large additional burden to the data user and owner. In this paper, we propose a dynamic attribute-based access control scheme to set a fine-grained valid time period for each attribute, which not only facilitates dynamic data sharing, but also enables flexible attribute revocation. We use smart contract to set valid time period for attributes. It provides smart management on users' attributes and avoids the waiting time of CSP caused by manual operations. We also introduce trapdoor that are indirectly related to time and proxy decryption method to reduce computational cost on data owners and users. Extensive security and performance analysis shows the security strength and effectiveness of the proposed scheme.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115541608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798817
Ghassan Alnwaimi, H. Boujemaa
In this article, we suggest to optimize packet length for energy harvesting systems. The network contains three nodes A, B, and C. Node B harvests energy from electromagnetic wave transmitted by A to communicate with node C. Packet length optimization allows to increase data rates. Two adaptation protocols are studied: In the first one, the adaptation of packet and Modulation and Coding Scheme (MCS) is made with respect to Average Signal to Noise Ratio (ASNR). In the second protocol, packet length and MCS are adapted to Instantaneous SNR (ISNR). Results show that packet length optimization allow 1–2 dB gain with respected to fixed packet length.
{"title":"Enhanced Data Rates for Energy Harvesting Systems","authors":"Ghassan Alnwaimi, H. Boujemaa","doi":"10.1109/ICT.2019.8798817","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798817","url":null,"abstract":"In this article, we suggest to optimize packet length for energy harvesting systems. The network contains three nodes A, B, and C. Node B harvests energy from electromagnetic wave transmitted by A to communicate with node C. Packet length optimization allows to increase data rates. Two adaptation protocols are studied: In the first one, the adaptation of packet and Modulation and Coding Scheme (MCS) is made with respect to Average Signal to Noise Ratio (ASNR). In the second protocol, packet length and MCS are adapted to Instantaneous SNR (ISNR). Results show that packet length optimization allow 1–2 dB gain with respected to fixed packet length.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124140786","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798813
Ghassan Alnwaimi, H. Boujemaa
In this paper, we suggest to maximize the instantaneous and average throughput of Visible Light Communications (VLC). Two approaches are presented: The first one uses the Instantaneous Signal to Noise Ratio (ISNR) to derive the Optimal Packet Length (OPL) that maximizes the instantaneous throughput. The second approach uses the Average Signal to Noise Ratio (ASNR) to derive the OPL that maximizes the average throughput. Instantaneous throughput maximization using OPL allows up to 4.5 dB gains with respect to fixed packet length. Average throughput maximization using OPL allows up to 1.5 dB gains with respect to fixed packet length.
{"title":"Instantaneous and Average Throughput Maximization for Visible Light Communications","authors":"Ghassan Alnwaimi, H. Boujemaa","doi":"10.1109/ICT.2019.8798813","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798813","url":null,"abstract":"In this paper, we suggest to maximize the instantaneous and average throughput of Visible Light Communications (VLC). Two approaches are presented: The first one uses the Instantaneous Signal to Noise Ratio (ISNR) to derive the Optimal Packet Length (OPL) that maximizes the instantaneous throughput. The second approach uses the Average Signal to Noise Ratio (ASNR) to derive the OPL that maximizes the average throughput. Instantaneous throughput maximization using OPL allows up to 4.5 dB gains with respect to fixed packet length. Average throughput maximization using OPL allows up to 1.5 dB gains with respect to fixed packet length.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128614670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798805
Hiep Nguyen
In this paper, we propose a simple max-min power control scheme for Multi-User MIMO (MU-MIMO) in massive MIMO systems. We model and formulate the issue as a max-min fairness power control problem, which needs to be considered in order to provide good experienced service for users in the system. By exploiting the special properties of the solution, we are able to propose a very simple power control algorithm with complexity $mathcal{O}(M(N+M))$ where $M$ and $N$ are the number of users and base station antennas respectively. In addition, only the estimated channel response and maximum transmit power of each user are required as input information. We implement the proposed algorithm on a record-playback massive MIMO testbed to verify the performance in real environment. The result show that the received signal quality of the worst user is much more improved, and all users experience roughly the same level of quality of service. In addition, simulation is carried out to confirm the advantage of the proposed scheme in term of minimum spectral efficiency.
{"title":"Low Complexity Max-Min Uplink Power Control in Massive MIMO System with Experiment on Testbed","authors":"Hiep Nguyen","doi":"10.1109/ICT.2019.8798805","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798805","url":null,"abstract":"In this paper, we propose a simple max-min power control scheme for Multi-User MIMO (MU-MIMO) in massive MIMO systems. We model and formulate the issue as a max-min fairness power control problem, which needs to be considered in order to provide good experienced service for users in the system. By exploiting the special properties of the solution, we are able to propose a very simple power control algorithm with complexity $mathcal{O}(M(N+M))$ where $M$ and $N$ are the number of users and base station antennas respectively. In addition, only the estimated channel response and maximum transmit power of each user are required as input information. We implement the proposed algorithm on a record-playback massive MIMO testbed to verify the performance in real environment. The result show that the received signal quality of the worst user is much more improved, and all users experience roughly the same level of quality of service. In addition, simulation is carried out to confirm the advantage of the proposed scheme in term of minimum spectral efficiency.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127505220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798776
N. A. Ahmad, Nur Idora Abdul Razak
Narrow-Band Internet of Things (NB-IoT) offers low power and wide coverage for IoT services which reuse existing Long Term Evolution (LTE) technology. Coverage enhancement at weak signal area may be achieved by channel repetition to improve signal quality. In this paper, the performance of NB-IoT is evaluated for three different modes of deployments by repeating the downlink physical channel. It is proved that the increase in the number of repetitions will give better performance of NB-IoT system. It also shows that the standalone and guard band modes perform better compared to in-band mode.
{"title":"Performance of Narrow-Band Internet of Things (NB-IoT) Based on Repetition of Downlink Physical Channel","authors":"N. A. Ahmad, Nur Idora Abdul Razak","doi":"10.1109/ICT.2019.8798776","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798776","url":null,"abstract":"Narrow-Band Internet of Things (NB-IoT) offers low power and wide coverage for IoT services which reuse existing Long Term Evolution (LTE) technology. Coverage enhancement at weak signal area may be achieved by channel repetition to improve signal quality. In this paper, the performance of NB-IoT is evaluated for three different modes of deployments by repeating the downlink physical channel. It is proved that the increase in the number of repetitions will give better performance of NB-IoT system. It also shows that the standalone and guard band modes perform better compared to in-band mode.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131396317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798843
A. Rashich, S. Gorbunov
The paper addresses the BER performance of nonorthogonal multicarrier (SEFDM, Spectrally Efficient Frequency Division Multiplexing) signals in LTE fading channels. The one tap ZF-equalizer and equivalent OFDM presentation of SEFDM signals is used to perform channel correction. Demodulation is done using trellis based demodulator. The proposed receiver structure has relatively low computation complexity compared to SEFDM demodulators which use sphere decoder. Thus the proposed receiver is applicable to SEFDM signals with high number of subcarriers as in WiFi, LTE, DVB-T2 systems. The resulting BER performance of SEFDM in various LTE fading channels using the proposed receiver is comparable with performance of QPSK OFDM with the same number of subcarriers. The analysis is done under assumption of perfect channel knowledge.
{"title":"ZF equalizer and trellis demodulator receiver for SEFDM in fading channels","authors":"A. Rashich, S. Gorbunov","doi":"10.1109/ICT.2019.8798843","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798843","url":null,"abstract":"The paper addresses the BER performance of nonorthogonal multicarrier (SEFDM, Spectrally Efficient Frequency Division Multiplexing) signals in LTE fading channels. The one tap ZF-equalizer and equivalent OFDM presentation of SEFDM signals is used to perform channel correction. Demodulation is done using trellis based demodulator. The proposed receiver structure has relatively low computation complexity compared to SEFDM demodulators which use sphere decoder. Thus the proposed receiver is applicable to SEFDM signals with high number of subcarriers as in WiFi, LTE, DVB-T2 systems. The resulting BER performance of SEFDM in various LTE fading channels using the proposed receiver is comparable with performance of QPSK OFDM with the same number of subcarriers. The analysis is done under assumption of perfect channel knowledge.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130062232","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798642
Hung Lee Vei, Ivan Ku, Ayman A. El-Saleh, T. Le
A channel state information (CSI) feedback algorithm based on scalar quantization is proposed for a multiple-input multiple-output (MIMO) transmission. The performance of the proposed algorithm is evaluated using the effective transmission rate, which incorporates the effect of the CSI feedback overhead on transmission time. Besides that, the power consumed due to the computational complexity of the CSI feedback algorithm is taken into account together with the transmit power when evaluating the energy efficiency. We compare our proposed algorithm to other typical CSI feedback algorithms under correlated channel conditions. Simulation results show that the proposed algorithm enables practical MIMO transmission to achieve an relative transmission rate at 95% of the ideal rate.
{"title":"On the Efficiency of MIMO Transmission with Channel State Information Feedback","authors":"Hung Lee Vei, Ivan Ku, Ayman A. El-Saleh, T. Le","doi":"10.1109/ICT.2019.8798642","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798642","url":null,"abstract":"A channel state information (CSI) feedback algorithm based on scalar quantization is proposed for a multiple-input multiple-output (MIMO) transmission. The performance of the proposed algorithm is evaluated using the effective transmission rate, which incorporates the effect of the CSI feedback overhead on transmission time. Besides that, the power consumed due to the computational complexity of the CSI feedback algorithm is taken into account together with the transmit power when evaluating the energy efficiency. We compare our proposed algorithm to other typical CSI feedback algorithms under correlated channel conditions. Simulation results show that the proposed algorithm enables practical MIMO transmission to achieve an relative transmission rate at 95% of the ideal rate.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134464722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798814
Tran The Son, A. Burton, H. L. Minh, D. Hien
This paper proposes a novel design for a PC-to-PC USB-based indoor visible light communications system. The USB interface enables the design to be suitable not only for a PC but also for a variety of mobile devices. The experimental results show that the bandwidth of the established VLC link reaches 8.0 MHz with a measured bit error rate of 10e-5 spanning a distance of 2.0m. The data communication uses the ON-OFF keying non-return zero (OOK-NRZ) format, which is sufficient for transferring a high-definition Youtube video stream.
本文提出了一种基于pc - pc usb的室内可见光通信系统的新设计。USB接口使设计不仅适用于PC，也适用于各种移动设备。实验结果表明，所建立的VLC链路带宽达到8.0 MHz，测量误码率为10e-5，传输距离为2.0m。数据通信使用ON-OFF键控不返回零(OOK-NRZ)格式，足以传输高清Youtube视频流。
{"title":"Experimental study of PC-to-PC over a visible light channel using Li-Fi USB dongle","authors":"Tran The Son, A. Burton, H. L. Minh, D. Hien","doi":"10.1109/ICT.2019.8798814","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798814","url":null,"abstract":"This paper proposes a novel design for a PC-to-PC USB-based indoor visible light communications system. The USB interface enables the design to be suitable not only for a PC but also for a variety of mobile devices. The experimental results show that the bandwidth of the established VLC link reaches 8.0 MHz with a measured bit error rate of 10e-5 spanning a distance of 2.0m. The data communication uses the ON-OFF keying non-return zero (OOK-NRZ) format, which is sufficient for transferring a high-definition Youtube video stream.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134484449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2019-04-01DOI: 10.1109/ICT.2019.8798860
F. Challita, P. Laly, M. Liénard, D. Gaillot, P. Degauque, W. Joseph
Measurements have been carried out in a low-traffic road tunnel to investigate the influence of the polarization of the transmitting and receiving antennas on the channel characteristics. A real-time channel sounder working in a frequency band around 1.3 GHz has been used, the elements of the transmitting and receiving arrays being dual-polarized patch antennas. Special emphasis is made on cross-polarization discrimination factor and on the spatial correlation between array elements which has a great influence on the performances of transmit/receive diversity schemes. Various polarizations both at the transmitter and the receiver have been tested to minimize this spatial correlation while keeping the size of the array as small as possible.
{"title":"Experimental Study of Depolarization and Antenna Correlation in Tunnels in the 1.3 GHz Band","authors":"F. Challita, P. Laly, M. Liénard, D. Gaillot, P. Degauque, W. Joseph","doi":"10.1109/ICT.2019.8798860","DOIUrl":"https://doi.org/10.1109/ICT.2019.8798860","url":null,"abstract":"Measurements have been carried out in a low-traffic road tunnel to investigate the influence of the polarization of the transmitting and receiving antennas on the channel characteristics. A real-time channel sounder working in a frequency band around 1.3 GHz has been used, the elements of the transmitting and receiving arrays being dual-polarized patch antennas. Special emphasis is made on cross-polarization discrimination factor and on the spatial correlation between array elements which has a great influence on the performances of transmit/receive diversity schemes. Various polarizations both at the transmitter and the receiver have been tested to minimize this spatial correlation while keeping the size of the array as small as possible.","PeriodicalId":127412,"journal":{"name":"2019 26th International Conference on Telecommunications (ICT)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133899407","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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