最近很多計(jì)算機(jī)的同學(xué)咨詢，大概可以分為兩個(gè)方向，一個(gè)是同學(xué)們?cè)谡n程學(xué)習(xí)中遇到了代碼難題，或者是代碼的bug修改。還有一種就是有的同學(xué)在面對(duì)計(jì)算機(jī)論文的時(shí)候犯難了，計(jì)算機(jī)專業(yè)的論文寫作和其他論文寫作技巧一樣呢？一篇優(yōu)質(zhì)的計(jì)算機(jī)論文是什么樣子的呢？今天留學(xué)生論文輔導(dǎo)老師給大家提供一篇GSM Communication的論文。

Introduction

GSM is a connection between two people ? a caller and the called person – is the basic service of all telephone networks. To apply this service,the network must has ability to set up and maintain a call,which includes some tasks: identifying the called person,determining the location,routing the call,and ensuring that the connection is continued until conversation lasts. After the transaction,the connection is terminated.

GSM是兩個(gè)人之間的連接：呼叫者和被叫人，它是所有電話網(wǎng)絡(luò)的基本服務(wù)。要應(yīng)用此服務(wù)，網(wǎng)絡(luò)必須能夠設(shè)置和維護(hù)呼叫，其中包括一些任務(wù)：識(shí)別被叫人，確定位置，路由呼叫以及確保連接一直持續(xù)到對(duì)話持續(xù)。在事務(wù)之后，連接終止。

In a fixed telephone network,providing and managing connections is an easy process,because telephones are connected by wires to the network and their location is permanent from the networks’ point of view. Whereas,in a mobile network,the establishment of a call is more complex task,because it doesn’t have wire and permanent location. It enables the users to move by wireless (radio) connection.

在固定電話網(wǎng)絡(luò)中，提供和管理連接是一個(gè)簡(jiǎn)單的過(guò)程，因?yàn)殡娫捦ㄟ^(guò)電線連接到網(wǎng)絡(luò)，并且從網(wǎng)絡(luò)的角度來(lái)看它們的位置是永久性的。然而，在移動(dòng)網(wǎng)絡(luò)中，建立呼叫是比較復(fù)雜的任務(wù)，因?yàn)樗鼪](méi)有線路和永久位置。它使用戶能夠通過(guò)無(wú)線(無(wú)線電)連接進(jìn)行移動(dòng)。

What is GSM?

GSM stands for Global System for Mobile Communication and is an open,digital cellular technology transmits mobile voice and data services. It is a digital mobile telephony system that is widely used technology in the world. The GSM market has more than 70 percent of the world’s digital cellular subscribers. The GSM makes use of narrowband Time Division Multiple Access (TDMA) technique for transmitting signals. The GSM was developed by using digital technology. It has an ability to carry 64 kbps to 120 Mbps of data rates.

GSM代表全球移動(dòng)通信系統(tǒng)，是一種開(kāi)放的數(shù)字蜂窩技術(shù)，可傳輸移動(dòng)語(yǔ)音和數(shù)據(jù)服務(wù)。它是一種數(shù)字移動(dòng)電話系統(tǒng)，是世界上廣泛使用的技術(shù)。GSM市場(chǎng)擁有全球70%以上的數(shù)字蜂窩用戶。GSM利用窄帶時(shí)分多址(TDMA)技術(shù)發(fā)送信號(hào)。GSM是使用數(shù)字技術(shù)開(kāi)發(fā)的。它能夠承載64 kbps至120 Mbps的數(shù)據(jù)速率。

GSM operates at either the 900 MHz or 1800 MHz frequency band. In Europe,operates in the 900MHz and 1.8GHz bands and in US,operates 1.9GHz and 850MHz bands. The GSM is a circuit-switched system that divides each 200 kHz channel into eight 25 kHz time-slots.

GSM工作在900 MHz 或1800 MHz頻段。在歐洲，運(yùn)行在900MHz和1.8GHz頻段，在美國(guó)，運(yùn)行1.9GHz和850MHz頻段。GSM是一個(gè)電路交換系統(tǒng)，它將每個(gè)200 kHz信道分成8個(gè)25 kHz時(shí)隙。

Cell phones use GSM network by searching for cell phone towers in the nearby area. GSM carriers have roaming contacts with other GSM carriers and typically cover rural areas more completely. GSM also has the advantage of using SIM (subscriber identity module) cards. The SIM card,which acts as your digital identity,is tied to your cell phone service carrier’s network rather than to the handset itself. This allows for easy exchange from one phone to another without new cell phone service activation.

手機(jī)通過(guò)搜索附近區(qū)域的手機(jī)信號(hào)塔來(lái)使用GSM網(wǎng)絡(luò)。GSM運(yùn)營(yíng)商與其他GSM運(yùn)營(yíng)商具有漫游聯(lián)系，并且通常更全面地覆蓋農(nóng)村地區(qū)。GSM還具有使用SIM卡。SIM卡作為您的數(shù)字身份，與您的手機(jī)服務(wù)運(yùn)營(yíng)商的網(wǎng)絡(luò)相關(guān)聯(lián)，而不是與手機(jī)本身相關(guān)聯(lián)。這樣可以在不激活新手機(jī)服務(wù)的情況下輕松地從一部手機(jī)更換到另一部手機(jī)。

Today,more than 690 mobile networks provide GSM services across 213 countries and GSM represents 82.4% of all global mobile connections. According to GSM World,there are now more than 2 billion GSM mobile phone users worldwide. GSM World references China as “the largest single GSM market,with more than 370 million users,followed by Russia with 145 million,India with 83 million and the USA with 78 million users.”

如今，超過(guò)690個(gè)移動(dòng)網(wǎng)絡(luò)在213個(gè)國(guó)家提供GSM服務(wù)，GSM占全球移動(dòng)連接的82.4%。據(jù)GSM World稱，目前全球有超過(guò)20億的GSM手機(jī)用戶。GSM World將中國(guó)稱為“最大的單一GSM市場(chǎng)，擁有超過(guò)3.7億用戶，其次是俄羅斯，有1.45億，印度有8300萬(wàn)，美國(guó)有7800萬(wàn)用戶?！?/p>

以上便是一篇優(yōu)質(zhì)的留學(xué)生計(jì)算機(jī)專業(yè)的論文，以上一些論文寫作的技巧和方法同學(xué)們可以學(xué)習(xí)借鑒一些哦~如果需要更加系統(tǒng)的輔導(dǎo)還是建議同學(xué)們聯(lián)系我們客服老師，尋求專業(yè)的一對(duì)一輔導(dǎo)，根據(jù)自己的薄弱點(diǎn)來(lái)輔導(dǎo)學(xué)習(xí)，學(xué)校效果會(huì)事半功倍。