ITU-T的H.323標(biāo)準(zhǔn)[1規(guī)定了如何在沒有QoS保證的分組網(wǎng)上實(shí)現(xiàn)多媒體通信的具體技術(shù)要求和規(guī)程，它為在IP網(wǎng)絡(luò)上進(jìn)行聲音、視頻和數(shù)據(jù)通信建立了基礎(chǔ)。因?yàn)椋壳癐P網(wǎng)絡(luò)不能完全滿足會(huì)議系統(tǒng)所要求的多點(diǎn)對(duì)多點(diǎn)通信控制功能，需要有多點(diǎn)控制單元MCU處理多點(diǎn)視聽信號(hào)的分配、切換和管理。在Internet迅速發(fā)展和PC極為普及且性能較高的背景下，基于PC和IP網(wǎng)絡(luò)的桌面型視頻會(huì)議將有較好的應(yīng)用前景。整個(gè)系統(tǒng)包括：終端、網(wǎng)關(guān)、網(wǎng)守和MCU，都是基于PC和Windows系統(tǒng)用VC+ +實(shí)現(xiàn)的。1 MCU的總體設(shè)計(jì)MCU支持同時(shí)舉行多個(gè)會(huì)議，會(huì)議的個(gè)數(shù)沒有限制，每個(gè)會(huì)議可以接入多個(gè)終端。MCU可接入終端的數(shù)量理論上只限制于Windows操作系統(tǒng)下可使用的SOCKET端口的數(shù)量，實(shí)際上主要的限制在于MCU接入的網(wǎng)絡(luò)帶寬和MCU主機(jī)的處理能力如CPU、內(nèi)存等。
標(biāo)簽： mcu
上傳時(shí)間： 2022-06-26
上傳用戶：wangshoupeng199
PrefaceDuring the past years, there has been a quickly rising interest in radio access technologies for providingmobile as well as nomadic and fixed services for voice, video, and data. The difference indesign, implementation, and use between telecom and datacom technologies is also becoming moreblurred. One example is cellular technologies from the telecom world being used for broadband dataand wireless LAN from the datacom world being used for voice-over IP.Today, the most widespread radio access technology for mobile communication is digital cellular,with the number of users passing 5 billion by 2010, which is more than half of the world’s population.It has emerged from early deployments of an expensive voice service for a few car-borne users,to today’s widespread use of mobile-communication devices that provide a range of mobile servicesand often include camera, MP3 player, and PDA functions. With this widespread use and increasinginterest in mobile communication, a continuing evolution ahead is foreseen.This book describes LTE, developed in 3GPP (Third Generation Partnership Project) and providingtrue 4G broadband mobile access, starting from the first version in release 8 and through the continuingevolution to release 10, the latest version of LTE. Release 10, also known as LTE-Advanced,is of particular interest as it is the major technology approved by the ITU as fulfilling the IMTAdvancedrequirements. The description in this book is based on LTE release 10 and thus provides acomplete description of the LTE-Advanced radio access from the bottom up.Chapter 1 gives the background to LTE and its evolution, looking also at the different standardsbodies and organizations involved in the process of defining 4G. It also gives a discussion of the reasonsand driving forces behind the evolution.Chapters 2–6 provide a deeper insight into some of the technologies that are part of LTE and itsevolution. Because of its generic nature, these chapters can be used as a background not only for LTEas described in this book, but also for readers who want to understand the technology behind othersystems, such as WCDMA/HSPA, WiMAX, and CDMA2000.Chapters 7–17 constitute the main part of the book. As a start, an introductory technical overviewof LTE is given, where the most important technology components are introduced based onthe generic technologies described in previous chapters. The following chapters provide a detaileddescription of the protocol structure, the downlink and uplink transmission schemes, and the associatedmechanisms for scheduling, retransmission and interference handling. Broadcast operation andrelaying are also described. This is followed by a discussion of the spectrum flexibility and the associated
標(biāo)簽： 4g 移動(dòng)通信
上傳時(shí)間： 2022-07-08
上傳用戶：
VIP專區(qū)-嵌入式/單片機(jī)編程源碼精選合集系列（30）資源包含以下內(nèi)容：1. 用Keilc編寫的讀取計(jì)算機(jī)pc鍵盤碼的程序.2. itu.656數(shù)字分量視頻信號(hào)的接口－－中文版.3. 嵌入式系統(tǒng)的開發(fā)論文.4. 這是有關(guān)cpu和存儲(chǔ)器掛接的一個(gè)硬件課程設(shè)計(jì).5. HM701NEP(S3C44B0X)基本啟動(dòng)代碼,在此基礎(chǔ)上可以做各種實(shí)驗(yàn),包括個(gè)6文件,44BINIT.S 匯編代碼.6. 現(xiàn)場(chǎng)總線是用于過程控制現(xiàn)場(chǎng)儀表與控制室之間的一個(gè)標(biāo)準(zhǔn)的、開放的、雙向的多站數(shù)字通信系統(tǒng)。隨著計(jì)算機(jī)技術(shù)、通訊技術(shù)、集成電路技術(shù)的發(fā)展.7. S3C44B0X內(nèi)部共有6個(gè)16位的定時(shí)器單元這個(gè)實(shí)驗(yàn)把所有的定時(shí)器都用中斷方式測(cè)試。.8. 程序用于演示LCD的驅(qū)動(dòng)和編程方法其中包括初始化設(shè)置、坐標(biāo)位置、色彩選定、作圖方法等。.9. 代碼說明了一個(gè)ps2口驅(qū)動(dòng)和編程方法。主要是鼠標(biāo),當(dāng)鼠標(biāo)產(chǎn)生中斷時(shí).10. 一個(gè)ps2口驅(qū)動(dòng)和編程方法。主要是鍵盤,當(dāng)鍵盤產(chǎn)生中斷時(shí).11. 一本詳細(xì)講解運(yùn)算放大器應(yīng)用的書。是硬件電路得不錯(cuò)的指導(dǎo)。.12. 可以完成12點(diǎn)陣、16點(diǎn)陣漢字的漢字文本向字庫文本的轉(zhuǎn)換工作（非源碼）。.13. 詳細(xì)介紹了cpld技術(shù)的基礎(chǔ)知識(shí)及其應(yīng)用開發(fā)原理。.14. 在sharp 404開發(fā)板的串口測(cè)試代碼.15. 嵌入式系統(tǒng)MP3解碼的c語言算法.16. 本書主要介紹了嵌入式開發(fā)的基本概念、ToMu6)n開發(fā)環(huán)境的使用和vxwort5操作 系統(tǒng)程序設(shè)計(jì)核心技術(shù)等內(nèi)容。作者為國(guó)內(nèi)vxw皿比首批用戶.17. 本書通過介紹嵌入式領(lǐng)域的相關(guān)知識(shí).18. 超級(jí)字符／圖形點(diǎn)陣模提取軟件.19. C51使用技巧及實(shí)戰(zhàn).20. 嵌入式系統(tǒng)及系統(tǒng)級(jí)可編程產(chǎn)品.21. DS1302時(shí)鐘芯片驅(qū)動(dòng)程序.22. 采用gpio口來控制串口擴(kuò)展芯片的驅(qū)動(dòng)和測(cè)試程序.23. 嵌入式系統(tǒng)的USB驅(qū)動(dòng)(S3C2410).24. 一個(gè)基于pci2000數(shù)據(jù)采集卡的數(shù)據(jù)采集系統(tǒng)的源代碼.25. 本程序?yàn)橹本€插補(bǔ)程序.26. 為數(shù)控機(jī)床的圓弧插補(bǔ)程序.27. 直接解壓即可.28. 此代碼主要完成在vxworks 環(huán)境下的網(wǎng)絡(luò)編程.29. 主要完成在uc-os2操作系統(tǒng)對(duì)dsp的資源控制和調(diào)度.30. 本程序主要完成在dsp環(huán)境下對(duì)通過自己的程序可以把程序燒寫到中flash.31. 本程序完成在dsp 的平臺(tái)下.32. LM24064的開發(fā)程序,只顯示一張圖片.33. keil armdk 的詳細(xì)說明 主要針對(duì)周立公仿真器.34. 本文為應(yīng)用于嵌入式電子線路硬件pcb布線方面的書籍.35. isp1161驅(qū)動(dòng)代碼是我下載并該動(dòng)后而成,還有點(diǎn)缺點(diǎn),但對(duì)你可能有點(diǎn)幫助.36. jfs 源碼.37. jfs-2.4-1.1.7.tar.gz jfs 2.4－1.1.7 源碼.38. jfs-2.4-1.1.6-to-1.1.7.patch.gz jfs 源碼的補(bǔ)丁源碼.39. 這是一個(gè)提供給使用遙控器的嵌入式設(shè)備開發(fā)的一個(gè)中文拼音輸入法.40. 這些都是常用的通信設(shè)備的電路原理圖.
標(biāo)簽：
上傳時(shí)間： 2013-04-15
上傳用戶：eeworm
蟲蟲下載站版權(quán)所有 京ICP備2021023401號(hào)-1
