• 主题
  • 主题
  • 题名
  • 作者
  • 关键词
  • 摘要
  • 高级搜索  >
  • 外文期刊

  • 外文会议

  • 外文学位

  • 美国政府科技报告

  • 外军国防科技报告

  • 外文OA亿博帐号注册

  • 中文期刊

  • 中文会议

  • 中文学位

  • 美国卫生研究院亿博帐号注册

  • 中国专利

  • 外国专利

  • 您现在的位置:首页> 外文学位 >亿博帐号注册详情

    【6h】 Medium access control layer analysis of the DVB-RCT system.

    机译DVB-RCT系统的媒体访问控制层分析。

    【摘要】The thesis investigates the performance of the medium access control (MAC) layer of the digital video broadcasting return channel terrestrial (DVB-RCT) standard. It explains the working mechanism of the MAC layer and calculates the number of return channel terrestrial users that can access the system at any given time. A MAC procedure is used, which is similar to a hybrid protocol, combining time division multiple access (TDMA) and carrier sense multiple access (CSMA) schemes to assign slot times to every user and then computing the bit-rate for every contending user by assigning sub-carriers within the sub-channel until the required bit-rate threshold is reached for a particular bit-error-rate (BER).;Quality of service (QoS) is an important parameter in connectionless networks, and is a vital element in the design on this system. QoS challenges are brought about by the vast needs of applications such as real time multimedia streaming, video conferencing etc. The proposed design tries to enhance the QoS parameter by weighting all users equally to access the system, while striving hard to accommodate the maximum number of users in the allocated bandwidth. To achieve our goal and to make our system robust, orthogonal frequency division multiplexing is used in conjunction with different quadrature amplitude modulation schemes to increase the spectral efficiency and to avoid multipath propagation effects.;The goal of providing dedicated time slots for return channel users is achieved where every user transmits at a minimum bit-rate threshold of 50 Mbps. A bit-error-rate in the vicinity of 10-6 is also maintained for every user. Finally a cross layer design is presented where MAC algorithms work jointly with the physical layer to achieve a complete non-line-of-sight communication system.;The system is intended for the residential user where the subscriber premises would be equipped with a 'Set-Top-Unit' (STU) that would communicate directly with the base station within a 5 km radius. The aim is to implement a design where the complexity is kept at the base station, and the MAC process handled by the Network User Interface assigns individual slot times to return channel stations.

    【摘要机译】本文研究了数字视频广播返回信道地面(DVB-RCT)标准的媒体访问控制(MAC)层的性能。它说明了MAC层的工作机制,并计算了在任何给定时间可以访问系统的地面回传用户数量。使用类似于混合协议的MAC程序,将时分多址(TDMA)和载波侦听多址(CSMA)方案相结合,为每个用户分配时隙,然后通过计算每个竞争用户的比特率在子信道内分配子载波,直到达到特定的误码率(BER)所需的比特率阈值为止。服务质量(QoS)是无连接网络中的重要参数,并且是至关重要的元素在此系统上进行设计。 QoS挑战是由实时多媒体流,视频会议等应用程序的巨大需求带来的。提出的设计试图通过均等加权所有用户以访问系统来增强QoS参数,同时努力适应最大数量的用户。用户分配的带宽。为了实现我们的目标并使系统健壮,将正交频分复用与不同的正交幅度调制方案结合使用,以提高频谱效率并避免多径传播效应。;为回波用户提供专用时隙的目标是每个用户都以50 Mbps的最小比特率阈值进行传输时实现。每个用户的比特错误率也保持在10-6附近。最后,提出了一种跨层设计,其中MAC算法与物理层一起工作以实现完整的非视距通信系统。该系统适用于订户所在处将配备“ Set”设备的住宅用户-Top-Unit'(STU),它将直接与半径5 km之内的基站进行通信。目的是实现一种设计,在该设计中基站保持复杂性,并且由网络用户界面处理的MAC进程将单独的时隙分配给返回信道站。

    【原文格式】PDF

  • 相关亿博帐号注册
  • 1. Physical and Medium Access Control criteria for the optimal Medium Access Control protocol data unit size in Automatic Repeat Request-enabled connections in IEEE 802.16e/WiMAX systems [J], Sharon, Oran;  Alpert, Yaron ...

    机译IEEE 802.16e / WimaX系统中启用自动重复请求的连接中的最佳媒体访问控制协议数据单元大小的物理和媒体访问控制标准

  • 2. Design and Analysis of an Access Control System for a Multi-Backend Database System. [R ], Ekici, A. ...

    机译多后端数据库系统访问控制系统的设计与分析。

  • 3. Modeling and Performance Analysis of Medium Access Control Schemes for Drive-Thru Internet Access Provisioning Systems [J], Atallah, Ribal F.;  Khabbaz, Maurice J.;  Assi, Chadi M. ...

    机译Drive-thru互联网接入供应系统媒体访问控制方案的建模与性能分析

  • 4. Performance Analysis of the Physical and Medium Access Control Layer Parameters with Effect of Varying Transmission Power Using IEEE 802.15.4 Standard for Wireless Body Sensor Networks [O ], Chiplunkar, Niranjan N.;  Nayak, K. Prabhakar;  Prasad, Durga ...

    机译基于IEEE 802.15.4无线人体传感器网络标准的不同传输功率影响的物理和媒体访问控制层参数性能分析

  • 5. Medium Access Control Layer Design and Simulation for 802.16 System [R ], Yu Cheng;  Hongwei Zhao;  Yucui Li;  Shihui Pei ...

    机译802.16系统的媒体访问控制层设计与仿真

  • 购物车
  • 意见反馈
  • 回到顶部
  • 回到首页
  • 联系方式:18141920177 (微信同号) 客服邮箱:kefu@zhangqiaokeyan.com
  • 中文期刊 外文期刊
  • 京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-1 六维联合信息科技(北京)有限公司©版权所有
  • 客服微信
  • 服务号