2008 Australasian Telecommunication Networks and Applications Conference最新文献_第3页

A Real-time Input Data Buffering Scheme Based on Time Synchronization for a T-DMB Software Baseband Receiver 基于时间同步的T-DMB软件基带接收机实时输入数据缓冲方案

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783325

Jeong Han Jeong, Moohong Lee, Byungjik Keum, Jungkeun Kim, Y. S. Shim, Hwang-Soo Lee

{"title":"A Real-time Input Data Buffering Scheme Based on Time Synchronization for a T-DMB Software Baseband Receiver","authors":"Jeong Han Jeong, Moohong Lee, Byungjik Keum, Jungkeun Kim, Y. S. Shim, Hwang-Soo Lee","doi":"10.1109/ATNAC.2008.4783325","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783325","url":null,"abstract":"To decode a broadcasting signal such as a T-DMB signal using a software baseband receiver running on a digital signal processor (DSP), real-time input data buffering is important. A time offset of each received frame, which is caused by a difference in the sampling frequency between the transmitter and the receiver, makes input buffer management difficult, eventually resulting in the performance deterioration of the receiver. This work proposes an input data buffering scheme based on a ring buffer for a T-DMB software baseband receiver running on a DSP. The time offset of each received frame is estimated by a time synchronization block using a phase reference symbol and is used by a buffer controller to control the ring buffer so that the receiver on the DSP always reads valid data for data decoding. The validity of the proposed scheme is confirmed by showing that the ring buffer never goes into an overflow state when buffering the input data with a time-varying time offset. Thus, the specified receiver performance is guaranteed over time.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"04 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127397732","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}

引用次数: 1

Fixed Broadband Wireless Access based on HAPS using COFDM Schemes: Channel Modelling and Performance Evaluation 基于COFDM方案的HAPS固定宽带无线接入:信道建模和性能评估

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783296

I. Palma-Lázgare, J. A. Delgado-Penín

{"title":"Fixed Broadband Wireless Access based on HAPS using COFDM Schemes: Channel Modelling and Performance Evaluation","authors":"I. Palma-Lázgare, J. A. Delgado-Penín","doi":"10.1109/ATNAC.2008.4783296","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783296","url":null,"abstract":"The high-data rate links in broadband wireless communications are being essential for a constant growth in the tough environment of radio transmissions, and orthogonal frequency division multiplexing (OFDM) can deal with these circumstances. Coded OFDM (COFDM) research in wireless communications is a concept of the well-use spectrum for robust high-data rate transmissions, and its regulation in the IEEE and ITU may have a profitable contribution in our high altitude platform (HAP) study. Moreover, HAP station (HAPS) based systems are now taking part in the world of wireless technologies to carry on with the anywhere and anytime wireless network service considerations. Due to all last considerations, HAP-channel modelling and COFDM-HAPS' performance evaluations conform our study. For our system representation the HAP-based system and ground users are considered as fixed terminals. Herein, our stratospheric channel modelling is approximated to real transmission conditions via the experimental land mobile satellite (LMS) record adoption. Performance results by means of BER vs SNR simulations are plotted and show that our proposal can overcome the wireless link effects of frequency selectivity and multipath fading; our results can offer an alternative idea of an efficient and robust solution for distribution of broadband wireless communications.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125995817","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}

引用次数: 3

How to Improve the Efficiency of IPv6 Handovers in IEEE 802.16 Networks 如何提高IEEE 802.16网络中IPv6切换的效率

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783337

Tomasz Mrugalski, J. Wozniak

{"title":"How to Improve the Efficiency of IPv6 Handovers in IEEE 802.16 Networks","authors":"Tomasz Mrugalski, J. Wozniak","doi":"10.1109/ATNAC.2008.4783337","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783337","url":null,"abstract":"The first generation of fully conformant IEEE 802.16-based networks is being deployed throughout the world. Most of these networks do not support full mobility, due to radio access layer limitations. Newer solutions, based on IEEE 802.16-2005 standard, offer mobility support for subscriber stations. Unfortunately, after quickly changing the point of attachment on the WiMAX layer, very slow and inefficient IPv6 reconfiguration takes place. Delays introduced by DHCPv6 stateless automatic configuration and mobile IPv6 can easily diminish or even render useless all benefits gained using the efficient WiMAX - data link layer. IPv6 automatic configuration process was not designed with fast reconfiguration in mind. As handover speed is a crucial requirement in mobile cellular environments, reasons behind delays introduced by IPv6 layer mechanisms have to be analyzed and appropriate countermeasures applied. Proposals include novel use of DHCPv6 relays for remote configuration, solving DAD delays, limiting Binding Update procedure in Mobile IPv6, configuring routing through DHCPv6 communication and some other. This paper describes all stages of full IPv6 handover in IEEE 802.16 environment, focusing on major reasons of reconfiguration delays. A new metric for assessing impact of every stage on handover efficiency is defined. Several proposed improvements to the IPv6 handover process are evaluated and simulation results are presented. A discussion regarding possible generalization of best improvement proposals and further research areas concludes this paper.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"237 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123010625","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}

引用次数: 5

Instant Handoffs for Wireless Infrastructure Meshed Networks 无线基础设施网状网络的即时切换

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783338

A. Kist

引用次数: 2

Performance Evaluation of VoIP Services using Different CODECs over a UMTS Network 在UMTS网络上使用不同编解码器的VoIP服务的性能评估

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783297

Jian Cao, M. Gregory

引用次数: 14

Quantitative Analysis of Incorrectly-Configured Bogon-Filter Detection 错误配置的玻色子过滤器检测的定量分析

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783287

J. Arnold, Olaf Maennel, A. Flavel, Jeremy McMahon, M. Roughan

引用次数: 2

Dynamic Topology Control Scheme in MANETs for AODV Routing 面向AODV路由的manet动态拓扑控制方案

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783331

A. Naghshegar, A. Darehshoorzadeh, A. Dana, M. Dehghan

引用次数: 2

An Intelligent Model to Control Preemption Rate of Instantaneous Request Calls in Networks with Book-Ahead Reservation 预先预约网络中瞬时请求呼叫抢占率的智能控制模型

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783348

I. Ahmad, J. Kamruzzaman, D. Habibi, Farzana Islam

引用次数: 3

Design and implementation of a hybrid remote display protocol to optimize multimedia experience on thin client devices 设计和实现一种混合远程显示协议，以优化瘦客户机设备上的多媒体体验

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783356

P. Simoens, P. Praet, B. Vankeirsbilck, J. De Wachter, L. Deboosere, F. De Turck, B. Dhoedt, P. Demeester

{"title":"Design and implementation of a hybrid remote display protocol to optimize multimedia experience on thin client devices","authors":"P. Simoens, P. Praet, B. Vankeirsbilck, J. De Wachter, L. Deboosere, F. De Turck, B. Dhoedt, P. Demeester","doi":"10.1109/ATNAC.2008.4783356","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783356","url":null,"abstract":"In a thin client computing architecture, application processing is delegated to a remote server rather than running the application locally. User input is forwarded to the server, and the rendered images are relayed through a dedicated remote display protocol to the user's device. Existing remote display protocols have been successfully optimized for applications with only minor and low-frequent screen updates, such as a spreadsheet or a text editor. However, they are not designed to cope with the fine-grained and complex color patterns of multimedia applications, leading to high bandwidth requirements and an irresponsive user interface. In this article, a hybrid remote display protocol approach is presented. The existing Remote FrameBuffer protocol of Virtual Network Computing (VNC-RFB) protocol is leveraged with a video streaming mode to transport the rendered images of multimedia applications to the client. Dependent on the amount of motion in the images to be presented, the images are relayed to the client either through the VNC-RFB protocol or through video streaming in the H.264 format. The architecture of this hybrid image renderer is presented and the implementation is detailed. Furthermore, the decision heuristic to switch between the VNC-RFB and the streaming mode is discussed. Experimental results clearly show the advantage of the hybrid approach in terms of client CPU and bandwidth requirements.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131763822","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}

引用次数: 64

Improving Mobile Sensor Connectivity Time in the IEEE 802.15.4 Networks 提高IEEE 802.15.4网络中移动传感器的连接时间

2008 Australasian Telecommunication Networks and Applications Conference Pub Date : 2008-12-01 DOI: 10.1109/ATNAC.2008.4783343

K. Zen, D. Habibi, I. Ahmad

{"title":"Improving Mobile Sensor Connectivity Time in the IEEE 802.15.4 Networks","authors":"K. Zen, D. Habibi, I. Ahmad","doi":"10.1109/ATNAC.2008.4783343","DOIUrl":"https://doi.org/10.1109/ATNAC.2008.4783343","url":null,"abstract":"In the IEEE 802.15.4 medium access control (MAC) protocol for wireless sensor networks, a sensor node needs to associate with a coordinator before it starts sending or receiving data. The sensor node will mostly choose the nearest coordinator to associate with. However, this method is not suitable for a constantly moving sensor node because it will end up switching coordinators too often due to short connectivity time. The IEEE 802.15.4 has a simplistic and inadequate method of choosing a coordinator in this context. In this paper, we introduce a method to increase the mobile sensor node connectivity time with its co-ordinator in IEEE 802.15.4 beacon-enabled mode. Our method is based on the timestamp of the beacons received from the nearby coordinators and filtering weak beacon signals. By choosing the coordinator which has sent the most recent received beacon with good signal quality, we increase the moving node connectivity time with the coordinator. Our technique results in significant improvement by reducing the number of times the moving node switches coordinators. This increases the throughput and reduces the wasted power in frequent associations.","PeriodicalId":143803,"journal":{"name":"2008 Australasian Telecommunication Networks and Applications Conference","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123378574","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}

引用次数: 7