·原书名： WCDMA FOR UMTS-Radio Access for Third Generation Mobile Communication 作者：（芬）哈里.霍尔马 安提.托斯卡拉 [同作者作品] 译者： 周胜[同译者作品] 等 丛书名： 其他 出版社：机械工业出版社* ISBN：7111096681 上架时间：2002-1-19 出版日期：2002 年1月 页码：266 版次：1-1
上传时间： 2013-08-05
上传用户：y307115118
摘自《UMTS中的LTE：向LTE-Advanced演进（原书第2版）》 （芬）Harri Holma 等编著 郎为民 等译
上传时间： 2013-11-01
上传用户：冇尾飞铊
介绍了MIMO的基本原理，并在此基础上对MIMO在不同移动通信系统中的应用进行了阐述，最后介绍了R&S公司的相应测试解决方案。 1 引言 对于所有的无线通信系统而言，无论是3GPP UMTS这样的移动无线网络，还是像WLAN那样的无线局域网，除了通过高阶调制或更大的信号带宽这样传统的方式来提高数据速率以外，还可以通过多天线技术来提高信道的容量。作为未来移动通信的必选项目，MIMO已经引起了更多的关注，而对于MIMO系统的实现和测试，也成为通信行业的热点及难点。本文在介绍MIMO的基本原理以及在MIMO不同移动通信标准表现形式的基础上，介绍R&S公司提供的相应测试解决方案，可以满足不同客户、不同标准及不同阶段的MIMO系统测试需求。 2 MIMO基本原理 根据不同的传输信道类型，可以在无线系统中使用相应的分集方式。目前，主要的分集方式包括时间分集（不同的时隙和信道编码）、频率分集（不同的信道、扩频和OFDM）以及空间分集等。多天线系统利用的就是空间方式，而MIMO作为典型的多天线系统，可以明显提高传输速率。而在实际的无线系统中，可以根据实际情况使用一种或者多种分集方式。
上传时间： 2013-12-26
上传用户：dave520l
WCDMA系统原理
上传时间： 2014-08-09
上传用户：cainaifa
本文从 VoIP 技术的发展现状开始，分析了 VoIP 的发展方向，引入了软 交换和下一代网络的架构，讨论了软交换和下一代网络的功能、主要协议、 组网用途、和演进策略，介绍了软交换架构在下一代移动通讯网 UMTS 中的 应用。然后本文讨论了 H.323 协议的体系结构和它在软交换中应用的必要性 和可行性。之后，介绍了 SIP 网络与 H.323 网络地址解析体系的不同与互通 问题，研究分析了他们之间的互通寻址定位方案。
上传时间： 2015-10-09
上传用户：comua
After the successful global introduction during the past decade of the second generation (2G) digital mobile communications systems, it seems that the third generation (3G) Universal Mobile Communication System (UMTS) has finally taken off, at least in some regions. The plethora of new services that are expected to be offered by this system requires the development of new paradigms in the way scarce radio resources should be managed. The Quality of Service (QoS) concept, which introduces in a natural way the service differentiation and the possibility of adapting the resource consumption to the specific service requirements, will open the door for the provision of advanced wireless services to the mass market.
标签： the introduction successful generation
上传时间： 2013-12-30
上传用户：qq21508895
In recent years, cellular voice networks have transformed into powerful packet-switched access networks for both voice communication and Internet access. Evolving Universal Mobile Telecommunication System (UMTS) networks and first Long Term Evolution (LTE) installations now deliver bandwidths of several megabits per second to individual users, and mobile access to the Internet from handheld devices and notebooks is no longer perceived as slower than a Digital Subscriber Line (DSL) or cable connection. Bandwidth and capacity demands, however, keep rising because of the increasing number of people using the networks and because of bandwidth-intensive applications such as video streaming. Thus, network manufacturers and network operators need to find ways to continuously increase the capacity and performance of their cellular networks while reducing the cost.
标签： BRINGING NETWORKS Beyond and 3G 4G
上传时间： 2020-05-25
上传用户：shancjb
When joining Siemens in 2001, I also extended my research interest towards radio net- work planning methodologies. This area of research brought together my personal interest in mobile communications and in the design of efficient algorithms and data structures. Between 2001 and 2003, I participated in the EU project Momentum, which was target- ing the performance evaluation and optimization of UMTS radio networks. I
标签： Efficient Methods WCDMA for
上传时间： 2020-05-27
上传用户：shancjb
Wireless technologies like GSM, UMTS, LTE, Wireless LAN and Bluetooth have revolutionized the way we communicate by making services like telephony and Internet access available anytime and from almost anywhere. Today, a great variety of technical publications offer background information about these technologies but they all fall short in one way or another. Books covering these technologies usually describe only one of the systems in detail and are generally too complex as a first introduction. The Internet is also a good source, but the articles one finds are usually too short and super- ficial or only deal with a specific mechanism of one of the systems. For this reason, it was difficult for me to recommend a single publication to students in my telecommunication classes, which I have been teaching in addition to my work in the wireless telecommunication industry. This book aims to change this.
标签： LTE-Advanced From GSM Pro and 5G to
上传时间： 2020-05-27
上传用户：shancjb
Wireless technologies like GSM, UMTS, LTE, Wireless LAN and Bluetooth have revolu- tionized the way we communicate and exchange data by making services like telephony and Internet access available anytime and from almost anywhere. Today, a great variety of techni- cal publications offer background information about these technologies but they all fall short in one way or another. Books covering these technologies usually describe only one of the systems in detail and are generally too complex as a first introduction. The Internet is also a good source, but the articles one finds are usually too short and superficial or only deal with a specific mechanism of one of the systems. For this reason, it was difficult for me to recom- mend a single publication to students in my telecommunication classes, which I have been teaching in addition to my work in the wireless telecommunication industry. This book aims to change this.
标签： GSM LTE-Advanced
上传时间： 2020-05-27
上传用户：shancjb
