检索结果-内蒙古大学图书馆

Mobile IPV6 wireless test-bed experience

Mobile IPV6 wireless test-bed experience

2005 13th IEEE International Conference on Networks jointly held with the 2005 7th IEEE Malaysia International Conference on communications

作者： Yong, Chu Eu Khatun, Sabira Ali, Borhanuddin Mohd Othman, Mohamed Department of Computer and Communication System Engineering Faculty of Engineering Universiti Putra Malaysia Department of Communication Technology and Network Faculty of Science Computer Universiti Putra Malaysia

ISBN: (纸本)1424400007

Mobility support for Internet devices is very important, since mobile computing is getting more widespread. Since these devices are wireless and therefore mobile, they will derive great benefit form Mobile IPv6. Mobile IPv6 was designed to be a natural outgrowth of Mobile IPv4, just as IPv6 itself was designed to be a natural outgrowth of IPv4. A wireless test-bed was setup to see the performance of the handover. The wireless test-bed consists of hardware, software and network analyzes tools to monitor the handover operation. The hardware consists of a multicast router, 2 access point, home agent, mobile node. We analyzed packet loss, packet delay and handover delay in Mobile IPv6 wireless test-bed. Finally, it is concluded the average packet delay is 0.7s, the handover delay for the first handover (macro-mobility) is 4.4s (44 packet loss) and 4.2s (42 packet loss) during the second handover (micro-mobility). The behavior and performance of Mobile IPv6 scheme can be seen. © 2005 IEEE.

关键词： Wireless telecommunication systems

来源：评论

学校读者我要写书评

暂无评论

Multicast based and fast handover scheme in mobile IPv6 wireless network

Multicast based and fast handover scheme in mobile IPv6 wire...

引用

2005 IEEE International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, IWAT 2005

作者： Eu, Yong Chu Khatun, Sabira Ali, Borhanuddin Mohd Othman, Mohamand Department of Computer and Communication System Engineering Faculty of Engineering University Putra Malaysia 43200 Serdang Selangor Malaysia Department of Communication Technology and Network Faculty of Science Computer University Putra Malaysia 43200 Serdang Selangor Malaysia

Billions of portable computing devices such as mobile phone, laptop and palmtop computers are becoming widely available. Since these devices are wireless and therefore mobile, they will derive great benefit form Mobile IPv6. The main goal of Mobile IPv6 is that a mobile node is always addressable by its home address, whether it is currently attached to its home link or is away from home. Mobile IPv6 enables applications running on an Internet node to survive physical reconnection by inserting a few additional features at the network layer In this paper focus is given on a micro-mobility base test-bed development with improved algorithm. The test-bed consists of both hardware and software including four personal computers and one laptop. Laptop is used as mobile host (MH), two personal computers is acting as access point, one personal computer becomes home agent (HA) and one personal computer is used as multicast router (ML). This test-bed is used to verify the theoretical enhancement of micromobility handover algorithm and results (packet loss, handover delay and quality of service). There is no signaling traffic overload between MH, HA and correspondent host (CH), low handover delay-approximately below I Oms and good reception of video stream. © 2005 IEEE.

关键词： Multicasting

来源：评论

学校读者我要写书评

暂无评论

Theoretical and experimental results of energy based swinging up control for a remotely driven acrobot

Theoretical and experimental results of energy based swingin...

引用

作者： Xin, Xin Yamasaki, Masahiro Omasa, Kazuhisa Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 Japan

ISBN: (纸本)008045108X

The swinging up control for a remotely driven Acrobot (RDA) is studied and an energy based controller is designed via the Lyapunov stability theory. The analysis of convergence of the energy as well as the motion of the RDA under the controller is presented. The conditions on control parameters for achieving a successful swinging up control are given. Furthermore, simulation and experimental results are provided to validate the presented theoretical results. Copyright © 2005 IFAC.

关键词： Lyapunov methods

来源：评论

学校读者我要写书评

暂无评论

Current-mode approach for a variable-gain Low-Noise Amplifier (LNA)

Current-mode approach for a variable-gain Low-Noise Amplifie...

引用

2005 13th IEEE International Conference on Networks jointly held with the 2005 7th IEEE Malaysia International Conference on communications

作者： Lee, Lini Jamuar, S.S. Sidek, Roslina Mohd Khatun, Sabira Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Malaysia Department of Computer System and Communication Engineering Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Malaysia

ISBN: (纸本)1424400007

This paper presents a technique using current-mode approach for a CMOS variable-gain low noise amplifier, emphasizing on low power consumption and low noise factor at 1.8 GHz using standard 0.18 μm CMOS process. Rivaling classical designs in performance, this design has controllable gain range from 12.85 dB to 8.26 dB by varying current without changes in supply, Vdd as well as keeping noise factor minimum by introducing an additional capacitance. As a result, very low noise factor become possible at very low power consumption level through current-mode approach. © 2005 IEEE.

关键词： CMOS integrated circuits

来源：评论

学校读者我要写书评

暂无评论

Photorefractive bi-directional connection module with mutual-pumped phase conjugate mirror

Photorefractive bi-directional connection module with mutual...

引用

Information Optics and Photonics Technology

作者： Kori, Kazumasa Okamoto, Atsushi Takayama, Yoshihisa Bunsen, Masatoshi Funakoshi, Hisatoshi Ito, Terumasa Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Wireless Communications Department National Institute of Information and Communications Technology Research Group of Computer and Communication System Graduate School of Engineering Hokkaido University Kita13-Nishi8 Kita-ku Sapporo 060-8628 Japan

The purpose of this study is to apply a free-space optical interconnection to a reconfigurable board-to-board connection where the wiring patterns connecting boards are optically formed without electrical-optical conversion. We regard a photorefractive bi-directional connection module (PBCM) based on a mutually pumped phase conjugate mirror as a key device to construct such a connection network and employ PBCMs at input/output interfaces of each board. Although optical behaviors of PBCM are influenced by the exposure conditions, we especially focus on the diameter of beams illuminating photorefractive media placed inside PBCM so as to find some geometrical restrictions hi a design of networking system. Through numerical analyses, we show a sample configuration of PBCM for the board-to-board interconnection and present a conceptual design of input/output interface.

关键词： Optical interconnects

来源：评论

学校读者我要写书评

暂无评论

Impact of inter-cell interference on capacity in the joint multiple access (CDMA and SDMA) system

Impact of inter-cell interference on capacity in the joint m...

引用

2005 Asia-Pacific Conference on communications

作者： Ng, Chee Kyun Ismail, Mahamod Ali, Borhanuddin Mohd Khatun, Sabira Jamuar, Sudhanshu Shekhar Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering Universiti Kebangsaan Malaysia Malaysia

ISBN: (纸本)0780391322

Spatial filtering using smart antenna has emerged as a promising technique to improve the performance of cellular systems. Cell splitting and sectorisation in CDMA systems could result in an increase in system capacity. In this paper, we investigate the impact of inter-cell interference on reverse link capacity in a joint multiple access system arising from the combination of CDMA and SDMA systems. The system capacity of CDMA and SDMA systems is reviewed individually. The co-channel and antenna side-lobes interferences in SDMA systems due to the randomly located mobile users in a non-uniform traffic cell are studied. Therefore, the most realistic reverse link capacity improvement of the joint multiple access system is presented here by taking into consideration both intra-sector and inter-sector interferences. The results are based on the system parameters of CDMA and SDMA systems. © 2005 IEEE.

关键词： Code division multiple access

来源：评论

学校读者我要写书评

暂无评论

Performance of LAS-CDMA system using smart antenna

Performance of LAS-CDMA system using smart antenna

引用

2005 13th IEEE International Conference on Networks jointly held with the 2005 7th IEEE Malaysia International Conference on communications

作者： Ng, Chee Kyun Mohd Ali, Borhanuddin Khatun, Sabira Jamuar, Sudhanshu Shekhar Ismail, Mahamod Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering Universiti Kebangsaan Malaysia Malaysia

ISBN: (纸本)1424400007

The choice of CDMA spreading sequences predetermines the properties of the system. The properties of large area synchronous (LAS) CDMA system have been demonstrated an interference free window (IFW) compared to traditional CDMA systems. This IFW property, however, has a limited delay-offset range. It is not always possible that all the channel-induced multipath delay spread components will arrive within IFW delay-offset range if the conventional antenna is employed. In this paper, the high directive narrow beam of smart antenna system is employed to direct all the multipath propagation components to arrive within the IFW range. Moreover, smart antenna system with its mathematical model is described. The reduction of multipath propagation in smart antenna system is also described. Finally, system performance analysis in terms of BER and maximum delay spread in both conventional and smart antennas are presented. © 2005 IEEE.

关键词： Code division multiple access

来源：评论

学校读者我要写书评

暂无评论

Space Division Duplex (SDD) system using smart antenna

Space Division Duplex (SDD) system using smart antenna

引用

2005 IEEE International Workshop on Antenna Technology: Small Antennas and Novel Metamaterials, IWAT 2005

作者： Ng, Chee Kyun Khatun, Sabira Ali, Borhanuddin Mohd Jamuar, Sudhanshu Shekhar Ismail, Mahamod Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical and Electronic Engineering Faculty of Engineering Universiti Putra Malaysia Malaysia Department of Electrical Electronic and System Engineering Faculty of Engineering Universiti Kebangsaan Malaysia Malaysia

The most important property in wireless systems, when it comes to increasing spectral efficiency, is eliminating interference. Recently, there are several new multiple access schemes and duplexing systems have been introduced in wireless systems to overcome several major interferences such as inter symbol interference, multiple access interference and adjacent cell interference. In this paper, we introduce a new duplexing system so-called space division duplex which can eliminate all kinds of interference. This new duplexing system consists of smart antenna's multiple steered narrow beams and orthogonal large area synchronous spread spectrum codes. The purpose is to increase system capacity while maintain its zero correlation window characteristics. The major types of interference and the properties of large area synchronous codes to combat these major interferences are studied. The overviews of code division duplexing system applying these orthogonal smart codes in wireless environment are analyzed. These analyses have shown that the number of orthogonal codes utilization is limited. The proposed solutions of space division duplexing system with several advantages are presented. Besides that, the code reuse concept is proposed to overcome the limitation of orthogonal codes. Finally, the system performances in term of spectral efficiency and capacity are presented. © 2005 IEEE.

关键词： Space division multiple access

来源：评论

学校读者我要写书评

暂无评论

Analysis of unsaturation performance of IEEE 802.11 DCF with and without slow contention window decrease

Analysis of unsaturation performance of IEEE 802.11 DCF with...

引用

作者： Sakakibara, Katsumi Chikada, Shogo Yamakita, Jiro Faculty of Computer Science and System Engineering Okayama Prefectoral University Soja-shi 719-1197 Japan Okayama Prefectoral University Soja Japan Department of Communication Engineering Japan IEEE Japan of Japan Japan Department of Communication Engineering Okayama Prefectural University Soja Japan of Japan Japan United States

Most of analytical models proposed so far for the IEEE 802.11 distributed coordination function (DCF) focus on saturation performance. In this paper, we develop an analytic model for unsaturation performance evaluation of the IEEE 802.11 DCF with and without slow contention window decrease (SCWD). The model explicitly takes into account the carrier sensing mechanism and an additional backoff interval after successful frame transmission, both of which can be ignored under saturation conditions. Expressions are derived for throughput and delay characteristics by means of the equilibrium point analysis. The accuracy of our model is validated through computer simulation. Numerical results based on the IEEE 802.11b with CCK show that the SCWD can stably achieve approximately 20% performance gain over the normal 802.11 DCF under unsaturation conditions as well as saturation ones. Copyright © 2005 The Institute of Electronics, Information and communication Engineers.

关键词： Electric power distribution

来源：评论

学校读者我要写书评

暂无评论

THEORETICAL AND EXPERIMENTAL RESULTS OF ENERGY BASED SWINGING UP CONTROL FOR A REMOTELY DRIVEN ACROBOT

引用

IFAC Proceedings Volumes 2005年第1期38卷 241-246页

作者： Xin XIN Masahiro KANEDA Taiga YAMASAKI Kazuhisa OMASA Department of Communication Engineering Faculty of Computer Science and System Engineering Okayama Prefectural University 111 Kuboki Soja Okayama 719-1197 JAPAN

关键词： the Acrobot Underactuated mechanical system Swinging up control Robot control Stability Lyapunov methods Energy control Attractor

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：