·原書名： WCDMA FOR umts-Radio Access for Third Generation Mobile Communication 作者：（芬）哈里.霍爾馬 安提.托斯卡拉 [同作者作品] 譯者： 周勝[同譯者作品] 等 叢書名： 其他 出版社：機械工業出版社* ISBN：7111096681 上架時間：2002-1-19 出版日期：2002 年1月 頁碼：266 版次：1-1
上傳時間： 2013-08-06
上傳用戶：y307115118
摘自《umts中的LTE：向LTE-Advanced演進（原書第2版）》 （芬）Harri Holma 等編著 郎為民 等譯
上傳時間： 2013-11-01
上傳用戶：冇尾飛鉈
介紹了MIMO的基本原理，并在此基礎上對MIMO在不同移動通信系統中的應用進行了闡述，最后介紹了R&S公司的相應測試解決方案。 1 引言 對于所有的無線通信系統而言，無論是3GPP umts這樣的移動無線網絡，還是像WLAN那樣的無線局域網，除了通過高階調制或更大的信號帶寬這樣傳統的方式來提高數據速率以外，還可以通過多天線技術來提高信道的容量。作為未來移動通信的必選項目，MIMO已經引起了更多的關注，而對于MIMO系統的實現和測試，也成為通信行業的熱點及難點。本文在介紹MIMO的基本原理以及在MIMO不同移動通信標準表現形式的基礎上，介紹R&S公司提供的相應測試解決方案，可以滿足不同客戶、不同標準及不同階段的MIMO系統測試需求。 2 MIMO基本原理 根據不同的傳輸信道類型，可以在無線系統中使用相應的分集方式。目前，主要的分集方式包括時間分集（不同的時隙和信道編碼）、頻率分集（不同的信道、擴頻和OFDM）以及空間分集等。多天線系統利用的就是空間方式，而MIMO作為典型的多天線系統，可以明顯提高傳輸速率。而在實際的無線系統中，可以根據實際情況使用一種或者多種分集方式。
上傳時間： 2013-12-26
上傳用戶：dave520l
WCDMA系統原理
上傳時間： 2014-08-09
上傳用戶：cainaifa
本文從 VoIP 技術的發展現狀開始，分析了 VoIP 的發展方向，引入了軟 交換和下一代網絡的架構，討論了軟交換和下一代網絡的功能、主要協議、 組網用途、和演進策略，介紹了軟交換架構在下一代移動通訊網 umts 中的 應用。然后本文討論了 H.323 協議的體系結構和它在軟交換中應用的必要性 和可行性。之后，介紹了 SIP 網絡與 H.323 網絡地址解析體系的不同與互通 問題，研究分析了他們之間的互通尋址定位方案。
上傳時間： 2015-10-10
上傳用戶：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.
標簽： the introduction successful generation
上傳時間： 2013-12-30
上傳用戶：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.
標簽： BRINGING NETWORKS Beyond and 3G 4G
上傳時間： 2020-05-26
上傳用戶：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
標簽： Efficient Methods WCDMA for
上傳時間： 2020-05-27
上傳用戶：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.
標簽： LTE-Advanced From GSM Pro and 5G to
上傳時間： 2020-05-27
上傳用戶：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.
標簽： GSM LTE-Advanced
上傳時間： 2020-05-27
上傳用戶：shancjb
