mobile cellular telecommunications by w c y lee 2nd edition pdf free download
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mobile cellular telecommunications by w c y lee 2nd edition pdf free download
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Today, mobile communication is becoming more and more popular. You can see everywhere on mobile phones, offices, at home and on the way to work. In the year 2002, the number of mobile communications users is more than fixed phones. But have you noticed that different types of technologies are being used
GSM, which stands for Global Communications for Mobile Communications, is the most commonly used technology that has more than 1 billion users from more than 200 countries in the US, Europe and Asia. However, the frequency range may vary greatly in these countries too. In the US and parts of Asia, GSM networks work in GSM-850 and GSM-1900 bands. In addition, most regions, including PRC and UK operators, use GSM-800 and GSM-1800 bands. GSM-450 is used in rare countries like Finland. Although all GSM operators use the same technology, the network is not compatible between some bands.Apart from GSM, there are so many technologies used. For example, US and Canada used the system known as digital amps. Now some other advanced technologies like GSM have replaced the existing most networks, the second is called CDMA or code division multiple access. This is the first time the US military is used. After that, Quslcom made this technology available to ordinary users. A well known CDMA standard is known as CDMA One which is used by operators of PRC and Korea etc. In most areas of Asia, another mobile network is the market as a private access system. It is generally not used since the weakness of communication. One of the most special standards comes from Japan and it is called personal digital cellular. Compared to GSM, this standard has poor connection and low voice quality.
Everything is developing, similar to mobile communication. All the above technologies are known as 2G Today, due to technological progress, people are not satisfied with these techniques. Excellent scientists are developing an advanced technique by the name of 3G.GPRS and EDG, as advanced GSM, have been developed at the top of GSM with high rates and they are mentioned as 2.5G? And? 2.75 g? Respectively It is used by connecting handsets such as GPAs and mobile phones to connect to the Internet. The more advanced system UMTS, i.e. universal mobile telecommunication system, is a 3G standard and is outlined as 3GSM and it is evolving for 4G technologies. UMTS uses other techniques as the built-in air interface, and one of the most wildly used is called W-CDMA.
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