English  |  正體中文  |  简体中文  |  Items with full text/Total items : 66984/66984 (100%)
Visitors : 23029144      Online Users : 510
RC Version 7.0 © Powered By DSPACE, MIT. Enhanced by NTU Library IR team.
Scope Tips:
  • please add "double quotation mark" for query phrases to get precise results
  • please goto advance search for comprehansive author search
  • Adv. Search
    HomeLoginUploadHelpAboutAdminister Goto mobile version


    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8341


    Title: 針對正交分頻多工存取系統採用動態頻率選擇演算法;Algorithm for OFDMA Systems Using Dynamic Frequency Selection
    Authors: 黃建文;Chien-wen Huang
    Contributors: 通訊工程研究所碩士在職專班
    Keywords: 頻率;正交分頻多工;frequency;OFDMA
    Date: 2008-07-10
    Issue Date: 2009-09-22 11:23:24 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract: 隨著無線網路的蓬勃發展,WiMAX都會型無線區域網路的佈建是這幾年最發燒的話題,尤其是實體層採用OFDMA技術的IEEE 802.16e-2005規格將被視為下一代的行動通訊網路。 OFDMA技術支援多個使用者在同個時間點一起分享頻寬發送資料,大幅提高網路的使用者的容量及傳輸的吞吐率。本論文將重點放在訊框分配頻寬給使用者的下行資料時,能夠藉由不同使用者對於子通道有不同的通道品質特性,增加影像語音這類即時服務的資料可使用的訊框空間,並降低非即時服務資料傳送錯誤的機率。另外,考量到DL-MAP可能產生的Overhead,將可提升整個訊框可分配的頻寬資源。 As the wireless network growing rapidly in recent years, the construction of WiMAX metropolitan local network becomes the most popular issue. Especially the IEEE 802.16e-2005 standard, which provides OFDMA technique in physical layer, will be viewed as the next generation communication network. OFDMA technique allows multi-user sharing in the bandwidth and transmitting in the same time, then the network’s capacity and throughput increases drastically. The main idea is to consider that the downlink frames are shared between each user could increase the available slots for rtPS traffic like image and voice data, also decrease the probability of transmitting error for nrtPS traffic because the sub-channel qualities for each user are mutually independent. In addition, it will add the bandwidth’s resource in the frame by checking the overhead which DL-MAP produces.
    Appears in Collections:[通訊工程學系碩士在職專班 ] 博碩士論文

    Files in This Item:

    File SizeFormat
    0KbUnknown826View/Open


    All items in NCUIR are protected by copyright, with all rights reserved.

    社群 sharing

    ::: Copyright National Central University. | 國立中央大學圖書館版權所有 | 收藏本站 | 設為首頁 | 最佳瀏覽畫面: 1024*768 | 建站日期:8-24-2009 :::
    DSpace Software Copyright © 2002-2004  MIT &  Hewlett-Packard  /   Enhanced by   NTU Library IR team Copyright ©   - Feedback  - 隱私權政策聲明