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echnology), LTE, and that the technology field technical breakthroughs and promotion will greatly promote the global economy development. As a powerful nextgeneration wireless munication technology, the munication capacity than LTE cable work and its present some download speed can reach peak per 100 MBPS, upload peak rate of 50 can per MBPS. In the meeting, the industry journal analysts will LTE technology as the focus of this year39。s congress. But in the 15th day, global mobile munication association, China tele, special announced Heidi (Japan) and America KDDI in sun wei to promote munications pany because service and mercialization of LTE bee association new members. During the meeting, the Chinese huawei also launched a world first three modes LTE modems, the era of equipment for 3G and 2gb can patible standard requirement. The world of artificial intelligence is the development of mobile munication and a trend. Computer is being the function of smartphones mobile munication. According to the forecast, 2021, mobile phone number of Inter users around the world will use puters, billion over the Inter users, while smartphone and other Inter phone number will be 西安文理學(xué)院本科畢業(yè)設(shè)計(jì)(論文) 第 33 頁 reached billion. Vodafone group CEO vittorio amp。 39。 Secco labor in the subject, the report says, 2021 in a year the pany work, intelligent devices increased by 40%. The conference is the personalized discuss another hot issue. The expert thinks, future phones will not thousands of machines for each side, but the user39。s needs and different, especially with the interconnection between work era, each item needs more individuation. Design and production of the product is rich personalized mobile phone in an important petition. 16 on the BBS of mobile broadband congress agreed that mobile phone technology application will replace the protagonist bees mobile phones, development area of new USES will be the focus of future petition, media function is one of the main functions of the mobile phone. According to the forecast, cisco 2021, global mobile data quantity of video information is 64%. As the number of users of mobile phone at a media, it has the mass, except the realtime and interactive features, it has, at any time, anywhere, omnipresent characteristics, its influence over the Inter will be. According to the 18th conference mobile advertising BBS provides material, if the advertising market, mobile munications saturation advertising market scale is 10 times of the Inter. The experts also predict future mobile phone functions, will be more and more. It is either a munications tool that can also act as an electronic key, electronic purse, also may be the finger on the classroom, bank, television and movie theaters, hospitals, even in the washing machine and microwave remote conductor. The wind blow the green mobile munication field is the significant characteristic of the conference. Not only for the mobile operators and anizers and related equipment manufacturers, some energy saving and emission reduction enterprise also launched a few green products. Obtain the conference green mobile award VNL Indian panies exhibited solar mobile station system. The station just 8 hours in the sun, and can be filled with continuous use of 3 days, the signal can be covered within the radius of two kilometers. The genral stf(1mpoyidvc,uh)0jb。5wT數(shù)字通信技術(shù) 通信技術(shù)從模擬信號(hào)通信發(fā)展擁有先進(jìn) 的 QPSK 調(diào)制技術(shù)的數(shù)字信號(hào)通信。歐拉關(guān)系是用來幫助的正弦和余弦信號(hào)的乘法分析。 SPICE 仿真是用來說明一個(gè) QPSK 調(diào)制的 1MHz 的正弦波。相量圖顯示了一個(gè)同步本地振蕩器的影響。數(shù)字化處理是用來消除相位和頻率誤差。 在電子產(chǎn)品的初期,隨著科技發(fā)生翻天覆地的變化,本地和全球通信的地域界限開始削弱,使這個(gè)世界變得更小,因此能夠更容易的獲得知識(shí)和信息共享。貝爾和馬可尼的開拓性工作促成了信息時(shí)代的今天,鋪平了未來通信的發(fā)展道路的基石。 傳統(tǒng)意義上來說,本地通信是用通過電線,作為確??煽康男畔鬏敵杀拘б娴姆椒?。遠(yuǎn)程 通信則通過無線電波來達(dá)到傳送信息的需要。即使這是從硬件的角度來說是方便的。無線電波傳輸信息往往是高功率發(fā)射機(jī),為了克服依賴天氣的條件,大型建筑物,以及從其他來源的電磁干擾。 現(xiàn)在擁有的各種各樣調(diào)制技術(shù)在成本效益和接收信號(hào)的質(zhì)量上有不同的解決方案,但最近大多數(shù)仍然是模擬調(diào)制。頻率調(diào)制和相位調(diào)制提出了一定的對(duì)噪音的免疫力,而幅度調(diào)制比解調(diào)簡(jiǎn)單。然而,最近低成本微控制器的出現(xiàn)以及國(guó)內(nèi)移動(dòng)電話和衛(wèi)星通信的引進(jìn),使得數(shù)字調(diào)制得到了很好的推行和普及。隨著隨著數(shù)字調(diào)制技術(shù)本身帶來的全部?jī)?yōu)勢(shì),傳統(tǒng)的微處理器電路的優(yōu)勢(shì)已經(jīng)超 過了模擬電路。任何通信鏈路中不足之處,均可利用軟件消除?,F(xiàn)在可以加密信息,誤差修正,可確保對(duì)接收到的數(shù)據(jù)更加有信心,對(duì) DSP的使用可以減少有限的帶寬去分配給每個(gè)服務(wù)。 與傳統(tǒng)的模擬系統(tǒng)相比,數(shù)字調(diào)制具有可以使用振幅,頻率或相位調(diào)制的不同調(diào)制方式的優(yōu)勢(shì)。由于頻率和相位調(diào)制技術(shù)可克服更多的噪聲免疫力,所以它們是大多數(shù)服務(wù)的首選方案,并引起當(dāng)今激烈討論。 QPSK 調(diào)制的載波經(jīng)歷了四個(gè)階段的變化( 4符號(hào)),并且每個(gè)符號(hào)代表兩位二進(jìn)制數(shù)據(jù)。盡管這也許看起來根本微不足道,但此調(diào)制方案的設(shè)定,使一個(gè)載波傳輸 2比特信息而不 是 1 比特信息,從而有效地增加了載波一倍的帶寬。從而提高了傳輸速率。 世界移動(dòng)通信正迎來新的飛躍。寬帶化、智能化、個(gè)性化、媒體化、多功能化、環(huán)保化是世界移動(dòng)通信發(fā)展的新趨勢(shì)。移動(dòng)通信將在經(jīng)濟(jì)發(fā)展和社會(huì)進(jìn)步中發(fā)揮更重要的作用。 西安文理學(xué)院本科畢業(yè)設(shè)計(jì)(論文) 第 35 頁 15日至18日在這里舉行的世界移動(dòng)通信大會(huì)把移動(dòng)寬帶作為下一次信息產(chǎn)業(yè)革命的突破口。盡管3G技術(shù)普及的時(shí)間不長(zhǎng),但世界移動(dòng)通信界已經(jīng)把目光投向了包括“長(zhǎng)期演進(jìn)(LTE)”技術(shù)在內(nèi)的4G技術(shù),并認(rèn)為該領(lǐng)域技術(shù)的突破和推廣將大大推動(dòng)全球經(jīng)濟(jì)發(fā)展。 作為功能強(qiáng)大的下一代無線 通信技術(shù),LTE的通信容量甚至超過當(dāng)前一些有線網(wǎng)絡(luò),其下載峰值速率可達(dá)每秒100兆比特,上傳峰值速率也可達(dá)每秒50兆比特。在大會(huì)會(huì)刊上,多名業(yè)界分析師都將LTE技術(shù)列為今年大會(huì)的焦點(diǎn)。而在15日開幕當(dāng)天,全球移動(dòng)通信協(xié)會(huì)專門宣布,中國(guó)電信、日本凱迪(KDDI)通信公司和美國(guó)韋里孫通信公司因?yàn)椤爸铝ν苿?dòng)LTE的商業(yè)化服務(wù)”而成為協(xié)會(huì)的新會(huì)員。會(huì)議期間,中國(guó)華為公司還推出了世界首款“三模式LTE調(diào)制解調(diào)器”,這種面向4G時(shí)代的設(shè)備還可以兼容3G和2G標(biāo)準(zhǔn)的需求。 智能化是世界移動(dòng)通信發(fā)展的又一大趨勢(shì)。 具有電腦功能的智能手機(jī)正在成為移動(dòng)通信的主流。據(jù)預(yù)測(cè),到2021年,全世界手機(jī)上網(wǎng)用戶數(shù)量將達(dá)17.8億,超過使用電腦上網(wǎng)的用戶數(shù)量,同時(shí)智能手機(jī)和其他能上網(wǎng)的手機(jī)數(shù)量將達(dá)到18.2億部。沃達(dá)豐集團(tuán)首席執(zhí)行官維托里奧178??苿谠诖髸?huì)主旨報(bào)告中說,2009年一年該公司網(wǎng)絡(luò)中的智能設(shè)備增加了40%。 個(gè)性化是本次大會(huì)討論的另一熱點(diǎn)問題。與會(huì)專家認(rèn)為,今后的手機(jī)將不會(huì)“千機(jī)一面”,而是因每個(gè)用戶的需要而有所不同,特別是物與物之間互聯(lián)的物聯(lián)網(wǎng)時(shí)代到來后,每件物品的需求將更加個(gè)性化。設(shè)計(jì)生產(chǎn)富有個(gè)性化的手機(jī)產(chǎn)品是今后的一個(gè)重要競(jìng)爭(zhēng)領(lǐng)域。 16日關(guān)于移動(dòng)寬帶的大會(huì)主論壇達(dá)成一致意見認(rèn)為,手機(jī)應(yīng)用將取代手機(jī)技術(shù)成為移動(dòng)通信領(lǐng)域的主角,開發(fā)手機(jī)新用途將是未來競(jìng)爭(zhēng)的焦點(diǎn),其中媒體功能將是未來手機(jī)的主要功能之一。據(jù)思科公司預(yù)測(cè),到2021年,全球移動(dòng)通信數(shù)據(jù)量中的64%是視頻信息。 手機(jī)成為用戶數(shù)量最多的一種媒體后,它除了具有互聯(lián)網(wǎng)的海量、實(shí)時(shí)和互動(dòng)等特點(diǎn)外,還具有隨時(shí)、隨地、無所不在的特點(diǎn),其影響力將可能超過互聯(lián)網(wǎng)。根據(jù)大會(huì)18日舉行的移動(dòng)通信廣告論壇提供的資料,如果廣告市場(chǎng)都達(dá)到飽和,移動(dòng)通信的廣告市 場(chǎng)規(guī)模將是互聯(lián)網(wǎng)的10倍。 與會(huì)專家還預(yù)測(cè),未來的手機(jī)功能將越來越多。它既可以是通信工具,也可以充當(dāng)電子鑰匙、電子錢包,還可以是指尖上的教室、銀行、電視、影院、醫(yī)院,甚至可以遠(yuǎn)程指揮家中的洗衣機(jī)和微波爐。 The genral stf(1mpoyidvc,uh)0jb。5wT 綠色之風(fēng)吹進(jìn)世界移動(dòng)通信領(lǐng)域是本次大會(huì)的顯著特點(diǎn)。不僅主辦方呼吁各運(yùn)營(yíng)商和手機(jī)及相關(guān)設(shè)備生產(chǎn)商節(jié)能減排,一些企業(yè)還推出了一些綠色產(chǎn)品。獲得本次大會(huì)“綠色移動(dòng)獎(jiǎng)”的印度VNL公司展出了太陽能移動(dòng)基站系統(tǒng)。這種基站只要曬上8?jìng)€(gè)小時(shí)太陽就可以充滿電,然后可以連續(xù)使用3天,信號(hào)可覆蓋半徑2公里 內(nèi)區(qū)域。