·原書(shū)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(shū)名： 其他 出版社：機(jī)械工業(yè)出版社* ISBN：7111096681 上架時(shí)間：2002-1-19 出版日期：2002 年1月 頁(yè)碼：266 版次：1-1
標(biāo)簽： NOKIA WCDMA 系統(tǒng)設(shè)計(jì)
上傳時(shí)間： 2013-08-06
上傳用戶：y307115118
摘自《UMTS中的LTE：向LTE-Advanced演進(jìn)（原書(shū)第2版）》 （芬）Harri Holma 等編著 郎為民 等譯
標(biāo)簽： LTE 關(guān)鍵技術(shù)
上傳時(shí)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(chǔ)上對(duì)MIMO在不同移動(dòng)通信系統(tǒng)中的應(yīng)用進(jìn)行了闡述，最后介紹了R&S公司的相應(yīng)測(cè)試解決方案。 1 引言 對(duì)于所有的無(wú)線通信系統(tǒng)而言，無(wú)論是3GPP UMTS這樣的移動(dòng)無(wú)線網(wǎng)絡(luò)，還是像WLAN那樣的無(wú)線局域網(wǎng)，除了通過(guò)高階調(diào)制或更大的信號(hào)帶寬這樣傳統(tǒng)的方式來(lái)提高數(shù)據(jù)速率以外，還可以通過(guò)多天線技術(shù)來(lái)提高信道的容量。作為未來(lái)移動(dòng)通信的必選項(xiàng)目，MIMO已經(jīng)引起了更多的關(guān)注，而對(duì)于MIMO系統(tǒng)的實(shí)現(xiàn)和測(cè)試，也成為通信行業(yè)的熱點(diǎn)及難點(diǎn)。本文在介紹MIMO的基本原理以及在MIMO不同移動(dòng)通信標(biāo)準(zhǔn)表現(xiàn)形式的基礎(chǔ)上，介紹R&S公司提供的相應(yīng)測(cè)試解決方案，可以滿足不同客戶、不同標(biāo)準(zhǔn)及不同階段的MIMO系統(tǒng)測(cè)試需求。 2 MIMO基本原理 根據(jù)不同的傳輸信道類型，可以在無(wú)線系統(tǒng)中使用相應(yīng)的分集方式。目前，主要的分集方式包括時(shí)間分集（不同的時(shí)隙和信道編碼）、頻率分集（不同的信道、擴(kuò)頻和OFDM）以及空間分集等。多天線系統(tǒng)利用的就是空間方式，而MIMO作為典型的多天線系統(tǒng)，可以明顯提高傳輸速率。而在實(shí)際的無(wú)線系統(tǒng)中，可以根據(jù)實(shí)際情況使用一種或者多種分集方式。
上傳時(shí)間： 2013-12-26
上傳用戶：dave520l
WCDMA系統(tǒng)原理
標(biāo)簽： WCDMA UMTS 培訓(xùn)教材 系統(tǒng)原理
上傳時(shí)間： 2014-08-09
上傳用戶：cainaifa
本文從 VoIP 技術(shù)的發(fā)展現(xiàn)狀開(kāi)始，分析了 VoIP 的發(fā)展方向，引入了軟 交換和下一代網(wǎng)絡(luò)的架構(gòu)，討論了軟交換和下一代網(wǎng)絡(luò)的功能、主要協(xié)議、 組網(wǎng)用途、和演進(jìn)策略，介紹了軟交換架構(gòu)在下一代移動(dòng)通訊網(wǎng) UMTS 中的 應(yīng)用。然后本文討論了 H.323 協(xié)議的體系結(jié)構(gòu)和它在軟交換中應(yīng)用的必要性 和可行性。之后，介紹了 SIP 網(wǎng)絡(luò)與 H.323 網(wǎng)絡(luò)地址解析體系的不同與互通 問(wèn)題，研究分析了他們之間的互通尋址定位方案。
標(biāo)簽： VoIP 發(fā)展現(xiàn)狀
上傳時(shí)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(biāo)簽： the introduction successful generation
上傳時(shí)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(biāo)簽： BRINGING NETWORKS Beyond and 3G 4G
上傳時(shí)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(biāo)簽： Efficient Methods WCDMA for
上傳時(shí)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(biāo)簽： LTE-Advanced From GSM Pro and 5G to
上傳時(shí)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(biāo)簽： GSM LTE-Advanced
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
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