The first Third Generation Partnership Project (3GPP) Wideband Code Division Multiple Access (WCDMA) networks were launched during 2002. By the end of 2005 there were 100 open WCDMA networks and a total of over 150 operators having frequency licenses for WCDMA operation. Currently, the WCDMA networks are deployedinUniversalMobileTelecommunicationsSystem(UMTS)bandaround2GHz in Europe and Asia including Japan and Korea. WCDMA in America is deployed in the existing 850 and 1900 spectrum allocations while the new 3G band at 1700/2100 is expected to be available in the near future. 3GPP has defined the WCDMA operation also for several additional bands, which are expected to be taken into use during the coming years.
標(biāo)簽： HSDPAHSUPA Access Speed Radio UMTS High for
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
We were on the lookout for ice. I was in a 32 foot sailing yacht with writer and explorer Tristan Gooley, undertaking a double-handed sail from Scotland through the Faroes up to 66 33 45.7 N and the midnight sun. Now sailing out of the Arctic Circle we were approaching Iceland from the north, heading for the Denmark Straits, where ice flowed south. The Admiralty Pilot warned of bergs but the ice charts we had sailed with were over a week old. We needed an update.
標(biāo)簽： Interference Analysis
上傳時(shí)間： 2020-05-27
上傳用戶：shancjb
Reliable and accurate positioning and navigation is critical for a diverse set of emerging applications calling for advanced signal-processing techniques. This book provides an overview of some of the most recent research results in the field of signal processing for positioning and navigation, addressing many challenging open problems.
標(biāo)簽： Positioning Terrestrial Satellite Radio and
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
This book addresses the issues on the development of next generation CDMA technologies and contains a lot of information on the subject from both the open literature and my own research activities in the last fifteen years.
標(biāo)簽： Technologies Generation Next CDMA The
上傳時(shí)間： 2020-06-01
上傳用戶：shancjb
The world of home automation is an exciting field that has exploded over the past few years with many new technologies in both the commercial and open source worlds. This book provides a gateway for those interested in learning more about this topic and building their own projects. With the introduction of the Raspberry Pi computer in 2012, a small and powerful tool is now available for the home automation enthusiast, programmer, and electronic hobbyist. It allows them to augment their home with sensors and software.
標(biāo)簽： Automation Raspberry Home Pi
上傳時(shí)間： 2020-06-06
上傳用戶：shancjb
GaN is an already well implanted semiconductor technology, widely diffused in the LED optoelectronics industry. For about 10 years, GaN devices have also been developed for RF wireless applications where they can replace Silicon transistors in some selected systems. That incursion in the RF field has open the door to the power switching capability in the lower frequency range and thus to the power electronic applications. Compared to Silicon, GaN exhibits largely better figures for most of the key specifications: Electric field, energy gap, electron mobility and melting point. Intrinsically, GaN could offer better performance than Silicon in terms of: breakdown voltage, switching frequency and Overall systems efficiency.
標(biāo)簽： GaN-on-Si Displace and SiC Si
上傳時(shí)間： 2020-06-07
上傳用戶：shancjb
Modern power systems involve large amount of investment. An electric power system comprises of generation, transmission, and distribution of electric energy. Growth of power systems has led to very complex networks extended across large areas. In such situations, the proper functioning of a modern power system is heavily dependent upon the healthy operation of the transmission lines within it. Transmission lines are used to transmit a huge amount of power over a long distance. But as these lines are located in the open atmosphere, they are highly affected by different types of abnormal conditions or faults.
標(biāo)簽： Transmission Protection Line
上傳時(shí)間： 2020-06-07
上傳用戶：shancjb
Since OpenStreetMap (OSM) appeared more than ten years ago, new collaborative mapping approaches have emerged in different areas and have become important components of localised information and services based on localisation. There is now increased awareness of the importance of the space-time attributes of almost every event and phenomenon. Citizens now have endless possibilities to quickly geographically locate themselves with an accuracy previously thought impossible. Based on these societal drivers, we proposed a number of collaborative mapping experiments (“mapping parties”) to delegates of a large open-source geospatial conference and to citizens of the conference’s host city during July 2015.
標(biāo)簽： Information Leveraging Systems Mobile
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
Since its release, Arduino has become more than just a development platform; it has become a culture built around the idea of open source and open hardware, and one that is reimagining computer science and education. Arduino has opened hardware development by making the starting skills easy to obtain, but retaining the complexities of real-world application. This combination makes Arduino a perfect environment for school students, seasoned developers, and designers. This is the first Arduino book to hold the title of “Pro,” and demonstrates skills and concepts that are used by developers in a more advanced setting. Going beyond projects, this book provides examples that demonstrate concepts that can be easily integrated into many different projects and provide inspiration for future ones. The focus of this book is as a transition from the intermediate to the professional.
上傳時(shí)間： 2020-06-09
上傳用戶：shancjb
1運(yùn)行sigmawin+1.1選擇伺服驅(qū)動(dòng)器sigmawin+軟件開(kāi)始運(yùn)行時(shí)，會(huì)看到選擇連接的對(duì)話框，根據(jù)實(shí)際使用的通信端口來(lái)選擇伺服驅(qū)動(dòng)器和PC的連接。選擇連接伺服驅(qū)動(dòng)器的方式：在線或離線狀態(tài)，在線狀態(tài)是默認(rèn)設(shè)置在線方式：當(dāng)要對(duì)伺服驅(qū)動(dòng)器進(jìn)行調(diào)諧和設(shè)置時(shí)需要使用在線方式離線方式：當(dāng)要對(duì)參數(shù)進(jìn)行調(diào)整以及檢查屏幕顯示和機(jī)械分析時(shí)使用離線方式當(dāng)采用離線方式時(shí)選擇相應(yīng)系列的伺服，之后會(huì)出現(xiàn)sigmawin+軟件的主窗口當(dāng)選擇在現(xiàn)方式時(shí)之后進(jìn)行必要的通信端口的選擇點(diǎn)擊search按鈕，搜索當(dāng)先連接的端口，注：2-V為USB端口點(diǎn)擊search按鈕，當(dāng)驅(qū)動(dòng)器和PC成功連接后會(huì)出現(xiàn)如下對(duì)話框點(diǎn)擊出現(xiàn)的相應(yīng)型號(hào)的伺服驅(qū)動(dòng)器然后按connect按鈕或者直接雙擊伺服驅(qū)動(dòng)器來(lái)進(jìn)行連接，sigmawin+軟件的主窗口就會(huì)出現(xiàn)，點(diǎn)擊cancel關(guān)閉當(dāng)前對(duì)話框。Sigmawin+連接2-V后出現(xiàn)主窗口所有的應(yīng)用功能都可以通過(guò)菜單欄或工具欄上面使用1.2工具欄直接點(diǎn)擊工具欄上的圖標(biāo)就可以使用相應(yīng)的功能1.3參數(shù)設(shè)定伺服驅(qū)動(dòng)器的參數(shù)可以在離線模式和在線模式下進(jìn)行設(shè)置，但是這兩種狀態(tài)下的參數(shù)設(shè)置畫(huà)面是不同的。1.4參數(shù)的轉(zhuǎn)換在sigmawin+軟件主窗口中，點(diǎn)擊parameters然后點(diǎn)擊parameter converter選擇需要轉(zhuǎn)換的參數(shù)文件，即其他系列的伺服驅(qū)動(dòng)器，點(diǎn)擊open選中的文件將被導(dǎo)入，源文件對(duì)應(yīng)的驅(qū)動(dòng)器的型號(hào)會(huì)顯示在conversion source中。轉(zhuǎn)換后對(duì)應(yīng)的驅(qū)動(dòng)器型號(hào)也會(huì)在conversion destination中自動(dòng)設(shè)置。注：如果選擇了不能轉(zhuǎn)換的文件，會(huì)出現(xiàn)以下對(duì)話框提示你選擇了不能轉(zhuǎn)換的文件。點(diǎn)擊convert已選擇的之前系列的驅(qū)動(dòng)器參數(shù)文件將被轉(zhuǎn)換成和2-V系列驅(qū)動(dòng)器相一致的參數(shù)數(shù)據(jù)，而且會(huì)保存在新建的參數(shù)文件中。轉(zhuǎn)換完成后，轉(zhuǎn)換結(jié)果會(huì)顯示在參數(shù)轉(zhuǎn)換窗口中。如下：
標(biāo)簽： sigmawin
上傳時(shí)間： 2022-05-31
上傳用戶：
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