AP4000MT模塊是一款插針式4G網(wǎng)絡(luò)模塊,支持2*2貼片卡和外置SIM卡,實(shí)現(xiàn)UART 轉(zhuǎn)LTE雙向透傳功能;支持LTE-FDD、LTE-TDD、WCDMA、GSM通信網(wǎng)絡(luò),真正實(shí)現(xiàn)廣 覆蓋,長距離,全國漫游,為用戶提供實(shí)時(shí)、穩(wěn)定、透明數(shù)據(jù)傳輸?shù)耐ㄐ啪W(wǎng)絡(luò)。本產(chǎn)品所有 引腳引出,用戶使用更加方便;只需通過簡單的設(shè)置,即可實(shí)現(xiàn)串口到網(wǎng)絡(luò)的雙向數(shù)據(jù)透明 傳輸。
標(biāo)簽: 4G LTE 透傳模塊 ap4000mt
上傳時(shí)間: 2022-06-06
上傳用戶:
隨著現(xiàn)代移動(dòng)通信系統(tǒng)在全球商用化的快速推進(jìn)與蓬勃發(fā)展,以及通信系統(tǒng)日益增長的高速多媒體數(shù)據(jù)業(yè)務(wù)需求,新一代移動(dòng)通信系統(tǒng)需要更多更先進(jìn)的技術(shù)來實(shí)現(xiàn)更高的傳輸速率和系統(tǒng)容量,目前世界各國已將研究重點(diǎn)轉(zhuǎn)入第四代移動(dòng)通信系統(tǒng)的研究和開發(fā)。第三代合作伙伴計(jì)劃(3GPP)通用移動(dòng)通信系統(tǒng)技術(shù)的長期演進(jìn)(LTE)作為第四代移動(dòng)通信系統(tǒng)的主要研究技術(shù)方向,具有高速率、高系統(tǒng)容量、良好兼容性、應(yīng)用更多先進(jìn)技術(shù)等特點(diǎn)。基站收發(fā)機(jī)在移動(dòng)通信系統(tǒng)中特別是LTE基站中起著十分重要的作用,也是基站重要功能組成部分之一。收發(fā)機(jī)的射頻性能直接決定了基站通信質(zhì)量以及能否正常運(yùn)行,在正常使用過程中,基站與其他通信設(shè)備之間是否互相影響與相互間是否造成干擾也是收發(fā)機(jī)射頻應(yīng)用部分重點(diǎn)關(guān)注的問題之一。本課題將通過完成基站射頻收發(fā)機(jī)項(xiàng)目的研發(fā)和應(yīng)用,包括頻分雙工(FDD)LTE基站射頻系統(tǒng)測試與調(diào)試,對射頻收發(fā)模塊關(guān)鍵技術(shù)指標(biāo)與電路進(jìn)行研究,對收發(fā)鏈路重要參數(shù)進(jìn)行說明,并分析測試原理與意義,介紹測試系統(tǒng)與平臺、測試方法和技術(shù)要點(diǎn)。在本文研究過程中,主要包括三個(gè)方面的工作:1)介紹FDD LTE基站收發(fā)模塊系統(tǒng)的基本結(jié)構(gòu),并對其關(guān)鍵技術(shù)進(jìn)行研究,比如收發(fā)射頻鏈路,數(shù)字預(yù)失真等。
上傳時(shí)間: 2022-06-20
上傳用戶:fliang
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
標(biāo)簽: 4g 移動(dòng)通信
上傳時(shí)間: 2022-07-08
上傳用戶:
分享一下中興全套LTE培訓(xùn)資料,希望對大家有所幫助第一部分鏈接:http://dl.21ic.com/download/lte-299458.html 第二部分鏈接:http://dl.21ic.com/download/lte-299459.html 第三部分鏈接:http://dl.21ic.com/download/lte-299460.html
上傳時(shí)間: 2022-07-18
上傳用戶:
分享一下中興全套LTE培訓(xùn)資料,希望對大家有所幫助第一部分鏈接:http://dl.21ic.com/download/lte-299458.html 第二部分鏈接:http://dl.21ic.com/download/lte-299459.html 第三部分鏈接:http://dl.21ic.com/download/lte-299460.html
上傳時(shí)間: 2022-07-18
上傳用戶:
分享一下中興全套LTE培訓(xùn)資料,希望對大家有所幫助第一部分截圖:第二部分鏈接:http://dl.21ic.com/download/lte-299459.html 第三部分鏈接:http://dl.21ic.com/download/lte-299460.html
上傳時(shí)間: 2022-07-18
上傳用戶:XuVshu
SAE J1939協(xié)議中英文合集 全套非常好
標(biāo)簽: SAE J1939協(xié)議
上傳時(shí)間: 2022-08-10
上傳用戶:slq1234567890
控制器局域網(wǎng)(CAN)最初是由德國BOSCH公司為汽車的監(jiān)測、控制系統(tǒng)設(shè)計(jì)的。它是一種有效的支持分布式控制或者實(shí)時(shí)控制的串行通信網(wǎng)絡(luò)。由于其具有多主機(jī)、高性能以及高可靠性,CAN總線已經(jīng)廣泛應(yīng)用于汽車電子控制、過程控制、機(jī)械工業(yè)、紡織機(jī)械、機(jī)器人、數(shù)控機(jī)床、醫(yī)療器械以及傳感器等領(lǐng)域。CAN總線已經(jīng)形成國際標(biāo)準(zhǔn),并已被公認(rèn)為幾種最有前途的現(xiàn)場總線之一。 另一方面,隨著電動(dòng)車的技術(shù)的不斷發(fā)展,電動(dòng)車已經(jīng)開始邁向了市場普及的道路。對于電動(dòng)車電池的管理和維護(hù)越來越成為電動(dòng)車發(fā)展的重點(diǎn)之一。由于CAN具有抗干擾性強(qiáng)、連接簡單、無主通信等特點(diǎn),非常適合用來實(shí)現(xiàn)實(shí)時(shí)數(shù)據(jù)的采集和傳輸。因此,本文利用CAN總線為基礎(chǔ)設(shè)計(jì)了一個(gè)電池實(shí)時(shí)數(shù)據(jù)采集與管理系統(tǒng),經(jīng)分析、設(shè)計(jì)、編程和調(diào)試,在實(shí)際應(yīng)用中得以實(shí)現(xiàn)。 該系統(tǒng)主要包括數(shù)據(jù)采集層,數(shù)據(jù)傳輸層和用戶管理層三個(gè)部分。數(shù)據(jù)采集層的主要任務(wù)是電池實(shí)時(shí)數(shù)據(jù)的采集和發(fā)送;數(shù)據(jù)傳輸層的主要功能是通過CAN總線接收數(shù)據(jù)采集層發(fā)送的實(shí)時(shí)數(shù)據(jù),并將其轉(zhuǎn)換成RS232串口協(xié)議發(fā)送到上位機(jī);用戶管理層的主要功能是通過串口接收數(shù)據(jù),實(shí)時(shí)顯示,存儲和分析。 論文完成的主要工作有: (1) 通過對系統(tǒng)需求的分析,將整個(gè)系統(tǒng)分為三個(gè)獨(dú)立的層,分別進(jìn)行了軟硬件設(shè)計(jì),實(shí)現(xiàn)了系統(tǒng)的模塊化,增強(qiáng)了系統(tǒng)的應(yīng)用性; (2) 詳細(xì)的研究了CAN2.0B協(xié)議和SAE J1939協(xié)議,并在此基礎(chǔ)上,編寫了適合本設(shè)計(jì)的通訊協(xié)議; (3) 深入研究了MC9S12DG128芯片的硬件結(jié)構(gòu)和軟件設(shè)計(jì)方法; 本課題的創(chuàng)新點(diǎn)在于利用目前汽車工業(yè)廣泛采用的CAN總線協(xié)議,設(shè)計(jì)了一套簡單,高效,穩(wěn)定的電池?cái)?shù)據(jù)采集與管理系統(tǒng),并在實(shí)際中得以應(yīng)用。在系統(tǒng)設(shè)計(jì)過程中將整個(gè)系統(tǒng)分為3個(gè)層,大大提升了系統(tǒng)的模塊化水平,有利于系統(tǒng)的擴(kuò)展和維護(hù)。
上傳時(shí)間: 2013-07-07
上傳用戶:1417818867
SAE J1939協(xié)議是由汽車工程協(xié)會(SAE)定義的,SAE J1939協(xié)議在商用車輛、艦船、軌道機(jī)車、農(nóng)業(yè)機(jī)械和大型發(fā)動(dòng)機(jī)中是應(yīng)用最廣泛的應(yīng)用層協(xié)議,基于傳輸可靠性能優(yōu)越的CAN-bus總線,可達(dá)
上傳時(shí)間: 2013-07-11
上傳用戶:不挑食的老鼠
針對數(shù)字預(yù)失真系統(tǒng)對反饋鏈路平坦度的要求,提出一種在不斷開模擬鏈路的前提下,采用單音測量WCDMA<E混模基站射頻拉遠(yuǎn)單元反饋鏈路的增益平坦度,并采用最小二乘法,分別擬合射頻、本振和中頻的增益的方法。采用MATLAB工具產(chǎn)生濾波器系數(shù),在基本不增加復(fù)雜度的基礎(chǔ)上,通過DPD軟件離線補(bǔ)償中頻的增益不平坦度。實(shí)際應(yīng)用取得良好的補(bǔ)償效果。
標(biāo)簽: 數(shù)字預(yù)失真 反饋 增益
上傳時(shí)間: 2013-10-18
上傳用戶:haohaoxuexi
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