In this paper, an adaptive quadrature amplitude modulation (AQAM) scheme for an equalized system over a selective channel is investigated. To reduce intersymbol interference (ISI), a minimum-mean-squared-error decision feedback equalizer (MMSE-DFE) is used. In order to select the appropriate modulation mode, the receiver estimates the MSE at the equalizer output. This estimated MSE is then sent back to the transmitter which adjusts the modulation level. Simulation results illustrate that the MSE is accurately estimated and represents a viable switching metric. It is also shown that switching between different modulation modes does not affect the equalizer coefficients adaptation. Linear region of practical transmitter amplifiers is limited. Thus when switching from one modulation scheme to an another, it is important to control the peak power.
{"title":"On Combining Adaptive Modulation and Unbiased MMSE-DFE Receiver to Increase the Capacity of Frequency Selective Channels","authors":"M. Ammari, F. Gagnon","doi":"10.1109/AICT.2009.42","DOIUrl":"https://doi.org/10.1109/AICT.2009.42","url":null,"abstract":"In this paper, an adaptive quadrature amplitude modulation (AQAM) scheme for an equalized system over a selective channel is investigated. To reduce intersymbol interference (ISI), a minimum-mean-squared-error decision feedback equalizer (MMSE-DFE) is used. In order to select the appropriate modulation mode, the receiver estimates the MSE at the equalizer output. This estimated MSE is then sent back to the transmitter which adjusts the modulation level. Simulation results illustrate that the MSE is accurately estimated and represents a viable switching metric. It is also shown that switching between different modulation modes does not affect the equalizer coefficients adaptation. Linear region of practical transmitter amplifiers is limited. Thus when switching from one modulation scheme to an another, it is important to control the peak power.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133608371","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}
Alberto Blanc, D. Collange, Konstantin Avrachenkov
Compound TCP (CTCP) was designed by Tan at al. to improve the efficiency of TCP on high speed networks without unfairly penalizing other connections. In this work we analyze an isolated CTCP connection, identifying and classifying significantly different CTCP operating regimes depending on the system parameters. We show that in the “constant window” phase the congestion window can in fact have significant oscillations with non-negligible effect on the performances. These oscillations can also induce additional jitter in the cross traffic. We calculate the average throughput and average backlog size at the bottleneck link. These performance metrics depend on the CTCP operating regime. Under certain circumstances, an isolated CTCP connection on a high speed link utilizes around 75% of the link capacity.
{"title":"Modelling an Isolated Compound TCP Connection","authors":"Alberto Blanc, D. Collange, Konstantin Avrachenkov","doi":"10.1109/aict.2009.78","DOIUrl":"https://doi.org/10.1109/aict.2009.78","url":null,"abstract":"Compound TCP (CTCP) was designed by Tan at al. to improve the efficiency of TCP on high speed networks without unfairly penalizing other connections. In this work we analyze an isolated CTCP connection, identifying and classifying significantly different CTCP operating regimes depending on the system parameters. We show that in the “constant window” phase the congestion window can in fact have significant oscillations with non-negligible effect on the performances. These oscillations can also induce additional jitter in the cross traffic. We calculate the average throughput and average backlog size at the bottleneck link. These performance metrics depend on the CTCP operating regime. Under certain circumstances, an isolated CTCP connection on a high speed link utilizes around 75% of the link capacity.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134640339","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}
This paper formulates a framework for wireless network performance measurements with the scope of being as generic as possible. The methodology utilises a cross-layer approach in order to address the limitations of traditional layered techniques. A lot of work in the research community uses the channel power (Cp) to predict performance metrics in higher layers. There are currently two methods to measure Cp; either by using a spectrum analyser or from WiFi card information (RSSI). The paper discusses the correct configuration of a spectrum analyser (SA), to measure Cp. This paper, also provides a comparison of both SA and RSSI results produced inside an anechoic chamber for three different applications. The behaviour of the RSSI values showed significant discrepancy with both the SA results and what was intuitively expected. The results pinpoint the necessity of a cross-layer approach and the importance of carefully selected and positioned equipment for the accuracy of the measurements.
{"title":"A Framework for Cross-Layer Measurements in Wireless Networks","authors":"K. Kyriakopoulos, W. Whittow, D. Parish","doi":"10.1109/AICT.2009.47","DOIUrl":"https://doi.org/10.1109/AICT.2009.47","url":null,"abstract":"This paper formulates a framework for wireless network performance measurements with the scope of being as generic as possible. The methodology utilises a cross-layer approach in order to address the limitations of traditional layered techniques. A lot of work in the research community uses the channel power (Cp) to predict performance metrics in higher layers. There are currently two methods to measure Cp; either by using a spectrum analyser or from WiFi card information (RSSI). The paper discusses the correct configuration of a spectrum analyser (SA), to measure Cp. This paper, also provides a comparison of both SA and RSSI results produced inside an anechoic chamber for three different applications. The behaviour of the RSSI values showed significant discrepancy with both the SA results and what was intuitively expected. The results pinpoint the necessity of a cross-layer approach and the importance of carefully selected and positioned equipment for the accuracy of the measurements.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114240168","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}
Bluetooth, ultra-wideband (UWB), ZigBee, and Wi-Fi are four popular wireless standards for short-range communications. Specifically, ZigBee network is an emerging technology designed for low cost, low power consumption and low-rate wireless personal area networks (LR-WPAN) with a focus on the device-level communication for enabling the wireless sensor networks. In this paper, after a brief overview of the four short-range wireless standards, the developed ZigBee platforms, ITRI ZBnode, have been presented for wireless sensor networking applications. Moreover, design issues for ZigBee industrial applications and the experimental implementation have been demonstrated via a multi-hop tree network.
{"title":"Applications of Short-Range Wireless Technologies to Industrial Automation: A ZigBee Approach","authors":"Jin-Shyan Lee, Chun-Chieh Chuang, Chung-Chou Shen","doi":"10.1109/AICT.2009.9","DOIUrl":"https://doi.org/10.1109/AICT.2009.9","url":null,"abstract":"Bluetooth, ultra-wideband (UWB), ZigBee, and Wi-Fi are four popular wireless standards for short-range communications. Specifically, ZigBee network is an emerging technology designed for low cost, low power consumption and low-rate wireless personal area networks (LR-WPAN) with a focus on the device-level communication for enabling the wireless sensor networks. In this paper, after a brief overview of the four short-range wireless standards, the developed ZigBee platforms, ITRI ZBnode, have been presented for wireless sensor networking applications. Moreover, design issues for ZigBee industrial applications and the experimental implementation have been demonstrated via a multi-hop tree network.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124011321","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}
D. Kim, L. Mathy, M. Campanella, Rick Summerhill, James Williams, S. Shimojo, Y. Kitamura, H. Otsuki
Future Internet is a clean-slate research activity in the quest of new networking technologies to overcome the limits of the current Internet. In its experimental research, virtualization and federation are emerging as essential features, especially in the construction and operation of the testbeds. Moreover, they are believed to sustain as the fundamental features of the Future Internet itself. Visions and experiences on virtualization and federation are given by leading experts from US, EU, and Asia.
{"title":"Future Internet: Challenges in Virtualization and Federation","authors":"D. Kim, L. Mathy, M. Campanella, Rick Summerhill, James Williams, S. Shimojo, Y. Kitamura, H. Otsuki","doi":"10.1109/AICT.2009.8","DOIUrl":"https://doi.org/10.1109/AICT.2009.8","url":null,"abstract":"Future Internet is a clean-slate research activity in the quest of new networking technologies to overcome the limits of the current Internet. In its experimental research, virtualization and federation are emerging as essential features, especially in the construction and operation of the testbeds. Moreover, they are believed to sustain as the fundamental features of the Future Internet itself. Visions and experiences on virtualization and federation are given by leading experts from US, EU, and Asia.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122485970","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}
This paper presents transmission parameters of UVR (Unmanned Vehicle Robot) systems based on IEEE802.16e (Mobile-WiMAX) systems. UVR requires higher uplink multimedia data rate, which is different from commercial M-WiMAX system. This paper designs some parameters satisfying the UVR system requirements and demonstrates performance evaluation based on the parameters. For the transmission parameters, the number of DL/UL OFDM symbols are determined.For reliable transmission of control signals, DL modulation and coding rate is selected by QPSK, 1/2 coding rate and that of UL is chosen by 16QAM, 1/2 coding rate. Based on these parameters, computer simulations demonstrate the system performance of UVR system.
{"title":"Design and Analysis of Transmission Parameters for UVR System Based on IEEE802.16e (M-WiMAX)","authors":"Yoonju Lee, Jihyung Kim, Ilshin Lee, Jaehak Chung","doi":"10.1109/AICT.2009.56","DOIUrl":"https://doi.org/10.1109/AICT.2009.56","url":null,"abstract":"This paper presents transmission parameters of UVR (Unmanned Vehicle Robot) systems based on IEEE802.16e (Mobile-WiMAX) systems. UVR requires higher uplink multimedia data rate, which is different from commercial M-WiMAX system. This paper designs some parameters satisfying the UVR system requirements and demonstrates performance evaluation based on the parameters. For the transmission parameters, the number of DL/UL OFDM symbols are determined.For reliable transmission of control signals, DL modulation and coding rate is selected by QPSK, 1/2 coding rate and that of UL is chosen by 16QAM, 1/2 coding rate. Based on these parameters, computer simulations demonstrate the system performance of UVR system.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129342211","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}
Self-supervision and self-adaptability are key requirements for future network and service platform. This paper presents a fully distributed approach to the supervision of autonomic systems. The proposed approach relies on the self-adaptation features of autonomic elements and their clustering through self-organization algorithms. Furthermore, it presents two use cases of the proposed approach on fault handling and load balancing respectively. Moreover, the paper provides some initial evaluation, through simulation, on a load balancing use case. Finally, it compares the proposed approach with the related works.
{"title":"Highly Distributed Supervision for Autonomic Networks and Services","authors":"L. Ferrari, A. Manzalini, C. Moiso, P. Deussen","doi":"10.1109/AICT.2009.25","DOIUrl":"https://doi.org/10.1109/AICT.2009.25","url":null,"abstract":"Self-supervision and self-adaptability are key requirements for future network and service platform. This paper presents a fully distributed approach to the supervision of autonomic systems. The proposed approach relies on the self-adaptation features of autonomic elements and their clustering through self-organization algorithms. Furthermore, it presents two use cases of the proposed approach on fault handling and load balancing respectively. Moreover, the paper provides some initial evaluation, through simulation, on a load balancing use case. Finally, it compares the proposed approach with the related works.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129388854","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}
In this paper, we propose fairness-oriented dual-stream multiple-input multiple-output (MIMO) packet scheduling schemes for future multi-antenna packet radio systems. In general, multi-user transmit-receive schemes allow users to be scheduled on different parallel streams on the same time-frequency resource. Based on that, implementations of more intelligent scheduling schemes that are aware of the instantaneous state of the radio channel require utilization of time, frequency and spatial domain resources in an efficient manner. Stemming from the earlier advanced Proportional Fair (PF) scheduler studies, we extend the developments to dual-stream MIMO packet radios. Furthermore, we investigate the resulting fairness distribution among users together with efficiency in increasing the system capacity in terms of throughput and coverage by simulating practical orthogonal frequency division multiple access (OFDMA) system environment with MIMO functionality in Micro and Macro cell scenarios. As a concrete example, we demonstrate that by using new multi-user scheduling schemes, significant coverage improvements in the order of 30% can be obtained at the expense of only 14% throughput loss. Furthermore, the user fairness is also greatly increased, by more than 18%, when measured using Jain’s fairness index.
{"title":"Efficient Packet Scheduling Schemes for Multiantenna Packet Radio Downlink","authors":"Stanislav Nonchev, M. Valkama","doi":"10.1109/AICT.2009.73","DOIUrl":"https://doi.org/10.1109/AICT.2009.73","url":null,"abstract":"In this paper, we propose fairness-oriented dual-stream multiple-input multiple-output (MIMO) packet scheduling schemes for future multi-antenna packet radio systems. In general, multi-user transmit-receive schemes allow users to be scheduled on different parallel streams on the same time-frequency resource. Based on that, implementations of more intelligent scheduling schemes that are aware of the instantaneous state of the radio channel require utilization of time, frequency and spatial domain resources in an efficient manner. Stemming from the earlier advanced Proportional Fair (PF) scheduler studies, we extend the developments to dual-stream MIMO packet radios. Furthermore, we investigate the resulting fairness distribution among users together with efficiency in increasing the system capacity in terms of throughput and coverage by simulating practical orthogonal frequency division multiple access (OFDMA) system environment with MIMO functionality in Micro and Macro cell scenarios. As a concrete example, we demonstrate that by using new multi-user scheduling schemes, significant coverage improvements in the order of 30% can be obtained at the expense of only 14% throughput loss. Furthermore, the user fairness is also greatly increased, by more than 18%, when measured using Jain’s fairness index.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126851168","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}
In this paper, the design of a dual-mode transceiver for a power-line telecommunications (D-PLT) is described. We investigate on designing a system architecture of the D-PLT, adopting an efficient modulation technique against power-line channel and supporting a high reliability, which is well suited for the CENELEC B, C, and D bands roughly from 90 to 150 kHz. The proposed D-PLT is eventually integrated to a system-on-a-chip (SoC), synthesizing all of a baseband transceiver, a channel forward error correction (FEC) module, a micro-controller unit (MCU) to access communication protocols, and analog front end circuits, i.e., a pre-amplifier, a gain-amplifier, a digital-to-analog converter (DAC), a comparator, as well as external interfaces to communicate with application layer. The designed D-PLT is fabricated utilizing a mixed 0.18 um CMOS technology and it is required a total area of about 9,576 mm^2 consuming about 148 mW at the maximum data rates of 2.5 kbps.
介绍了一种用于电力线通信(D-PLT)的双模收发器设计。我们研究了D- plt的系统架构设计，采用针对电力线信道的高效调制技术，并支持高可靠性，非常适合90至150 kHz的CENELEC B, C和D频段。所提出的D-PLT最终集成到片上系统(SoC)中，综合了所有基带收发器、通道前向纠错(FEC)模块、访问通信协议的微控制器单元(MCU)和模拟前端电路，即前置放大器、增益放大器、数模转换器(DAC)、比较器以及与应用层通信的外部接口。所设计的D-PLT采用混合0.18 um CMOS技术制造，其总面积约为9,576 mm^2，最大数据速率为2.5 kbps，功耗约为148 mW。
{"title":"SoC Design of a Dual-Mode Transceiver for Power-Line Telecommunications","authors":"Sungsoo Choi, Yonghwa Kim, Won-tae Lee","doi":"10.1109/AICT.2009.82","DOIUrl":"https://doi.org/10.1109/AICT.2009.82","url":null,"abstract":"In this paper, the design of a dual-mode transceiver for a power-line telecommunications (D-PLT) is described. We investigate on designing a system architecture of the D-PLT, adopting an efficient modulation technique against power-line channel and supporting a high reliability, which is well suited for the CENELEC B, C, and D bands roughly from 90 to 150 kHz. The proposed D-PLT is eventually integrated to a system-on-a-chip (SoC), synthesizing all of a baseband transceiver, a channel forward error correction (FEC) module, a micro-controller unit (MCU) to access communication protocols, and analog front end circuits, i.e., a pre-amplifier, a gain-amplifier, a digital-to-analog converter (DAC), a comparator, as well as external interfaces to communicate with application layer. The designed D-PLT is fabricated utilizing a mixed 0.18 um CMOS technology and it is required a total area of about 9,576 mm^2 consuming about 148 mW at the maximum data rates of 2.5 kbps.","PeriodicalId":409336,"journal":{"name":"2009 Fifth Advanced International Conference on Telecommunications","volume":"59 1-2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126950635","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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