第四代移动通信技术，主要说明了4G移动通信的主要接入技术。
标签： 移动通信技术
上传时间： 2016-12-04
上传用户：wfeel
2.4G无线数据模块（CC1100芯片）的驱动程序，与MCU以PSI接口通信，可以用于在MSP430，AVR，ARM等微控制器上。多机通信可以实现用于工业控制领域的无线局域网。络。
上传时间： 2017-05-16
上传用户：zyt
AP4000MT模块是一款插针式4G网络模块，支持2*2贴片卡和外置SIM卡，实现UART 转LTE双向透传功能；支持LTE-FDD、LTE-TDD、WCDMA、GSM通信网络，真正实现广 覆盖，长距离，全国漫游，为用户提供实时、稳定、透明数据传输的通信网络。本产品所有 引脚引出，用户使用更加方便；只需通过简单的设置，即可实现串口到网络的双向数据透明 传输。
上传时间： 2022-06-06
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JDY-40 采用 2.4G 技术开发，视距 120 米，采用串口通信接口，使用简单快捷，只需要了解 串口知识就可以对 JDY-40 进行产品应用
上传时间： 2022-06-19
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5G，第五代移动通信技术，也是4G之后的延伸，目前正在研究中。目前还没有任何电信公司或标准订定组织（像3GPP，WiMAX论坛及ITU-R）的公开规格或官方文件有提到5G。按照业内初步估计，包括5G在内的未来无线移动网络业务能力的提升将在3个维度上同时进行：1）通过引入新的无线传输技术将资源利用率在4G的基础上提高10倍以上；2）通过引入新的体系结构（如超密集小区结构等）和更加深度的智能化能力将整个系统的吞吐率提高25倍左右；3）进一步挖掘新的频率资源（如高频段、毫米波与可见光等），使未来无线移动通信的频率资源扩展4倍左右.5G有以下特点：1）5G研究在推进技术变革的同时将更加注重用户体验，网络平均吞吐速率、传输时延以及对虚拟现实、3D、交互式游戏等新兴移动业务的支撑能力等将成为衡量5G系统性能的关键指标.2）与传统的移动通信系统理念不同，5G系统研究将不仅仅把点到点的物理层传输与信道编译码等经典技术作为核心目标，而是从更为广泛的多点、多用户、多天线、多小区协作组网作为突破的重点，力求在体系构架上寻求系统性能的大幅度提高.3）室内移动通信业务已占据应用的主导地位，5G室内无线覆盖性能及业务支撑能力将作为系统优先设计目标，从而改变传统移动通信系统“以大范围覆盖为主、兼顾室内"的设计理念.4）高频段频谱资源将更多地应用于5G移动通信系统，但由于受到高频段无线电波穿透能力的限制，无线与有线的融合、光载无线组网等技术将被更为普遍地应用.5）可“软”配置的5G无线网络将成为未来的重要研究方向，运营商可根据业务流量的动态变化实时调整网络资源，有效地降低网络运营的成本和能源的消耗.
上传时间： 2022-06-21
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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
上传时间： 2022-07-08
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现代通信系统 MATLAB版 清晰书签版
上传时间： 2013-05-15
上传用户：eeworm
通信原理课件 PPT版
标签： 通信原理
上传时间： 2013-04-15
上传用户：eeworm
通信原理（高频电子电路课件） PPT版
上传时间： 2013-04-15
上传用户：eeworm
通信电子线路 PPT格式
上传时间： 2013-04-15
上传用户：eeworm
