通信專(zhuān)業(yè)畢業(yè)設(shè)計(jì)外文翻譯---2g的潛力-展示頁(yè)
2025-05-26 15:30本頁(yè)面
【正文】 3G，同一個(gè)新聞服務(wù)可能會(huì)包括語(yǔ)音新聞的視頻剪輯或在新聞中附有生動(dòng)的圖像。 因此， 2G 系統(tǒng)仍然在提供多媒體服務(wù)方面很重要。這項(xiàng)規(guī)定僅僅是增加渠道。這種應(yīng)用在 3G 終端相對(duì)容易實(shí)現(xiàn)。 雖然 2G 被作為一個(gè)劣等的技術(shù)形象而 3G 是一個(gè)技術(shù)先進(jìn)的形象，他們各自保留自己的優(yōu)點(diǎn)和缺點(diǎn)。 2G 仍將服務(wù)于低收入和中等終端市場(chǎng)，而 3G 將服務(wù)于高端市場(chǎng)。 本文對(duì) 2G 和 3G 的分析，意味著一個(gè)技術(shù)的成功不僅與技術(shù)本身的表現(xiàn)有直接關(guān)系，還受其他許多因素的影響，包括市場(chǎng)需求，商業(yè)模式和政府的政策，其他國(guó)家的經(jīng)驗(yàn)有助于證明這一點(diǎn)。政府應(yīng)確?，F(xiàn)有的開(kāi)發(fā)商在改善自己的 2G 的服務(wù)質(zhì)量方面不放松。當(dāng)用戶正在開(kāi)展移動(dòng)銀行，他 /她應(yīng)該能夠在 3G 服務(wù)領(lǐng)域而不使用現(xiàn)有的 GPRS。對(duì)于多媒體和高速互聯(lián)網(wǎng)接入， 3G 模式可能是必要的。 共 8 頁(yè) 第 4 頁(yè) 附件（外文原文） Untapped Capabilities of 2g Stephen Abstract: The advent of 3G wireless technologies is obviously relegating the 2G work, gradually pushing them into oblivion. The shortings of 2G are the platform that brought about the development of 3G but this does not justify it to be scrapped. This paper will analyze these shortings and try to bring out the potentials of the 2G system which can still be garnered. This analysis will be based on the technology used by the system, marketing and the consumers. Keywords: Second generation for mobile munications, Third generation for mobile munications, General packet radio service, Global systems for mobile munication, Universal mobile telemunication system, Wideband code division multiple access 1. Introduction 2G technology has being said to have reached its capacity limit because of the lack of available channels . the channels are totally used up (congestion). This is especially said in the urban areas which are traffic hotspots, due to the population of people subscribed to the service. During peak hours the operators may soon be unable to provide service for everybody in these traffic hot spots. But the lack of capacity in 2G systems alone does not make the building of 3G systems necessary. Current phone usage is still mostly voice, and this traffic could be handled quite easily by just adding extra frequency allocations to 2G works (. from the UMTS spectrum[5Mhz]). Breaking it down, one GSM frequency carrier takes 200kHz bandwidth and can acmodate eight traffic channels. Thus, one WCDMA 5MHz frequency carrier could acmodate 25 GSM frequency carriers, translating into 200 GSM traffic channels. In practice, the number of traffic channels is lower, as control channels use part of the capacity, and also in TDMA systems, the same frequency cannot be reused in nearby base stations. Therefore, a 5MHz frequency slice would offer lots of new capacity for a GSM system. Apparently, the character of mobile munications will evolve considerably in the ing years, and data in their many forms will bee more and more important. Voice will remain an important ponent in telemunications, but quite often it will be bined with other types of information to form multimedia applications. The current 2G works were designed to transfer voice traffic only。 for example, WLAN systems can provide bit rates up to several tens of Mbps (100Mbps) in hot spots, which is much
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