Evolution of mobile radio communication

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    about evolution of mobile communication
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    Evolution of mobile radio communication
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    • 1. Presentation by : Manoj Mohan Jadhav Roll no: T4415 Div: A
    • 2.  The term ‘mobile’ has completely revolutionized the communication by opening up innovative applications that are limited to one's imagination. Today, mobile communication has become the backbone of the society. All the mobile system technologies have improved the way of living. Its main plus point is that it has privileged a common mass of society.
    • 3.  The first wire line telephone system was introduced in the year 1877. Mobile communication systems as early as 1934 were based on Amplitude Modulation (AM) schemes and only certain public organizations maintained such systems.  However, during its initial three and a half decades it found very less market penetration owing to high costs and numerous technological drawbacks. But with the development of the cellular concept in the 1960s at the Bell Laboratories, mobile communications began to be a promising field of expanse which could serve wider populations.
    • 4.  Simplex System: Simplex systems utilize simplex channels i.e., the communication is unidirectional.  Half Duplex System: Half duplex radio systems that use half duplex radio channels allow for non- simultaneous bidirectional communication.  Full Duplex System: Full duplex systems allow two way simultaneous communications.
    • 5.  The first mobile phone system in the market was AMPS. It was the first U.S. cellular telephone system, deployed in Chicago in 1983. The main technology of this first generation mobile system was FDMA/FDD and analog FM.
    • 6.  Digital modulation formats were introduced in this generation with the main technology as TDMA/FDD and CDMA/FDD. The 2G systems introduced three popular TDMA standards and one popular CDMA standard in the market.
    • 7.  3G is the third generation of mobile phone standards and technology, superseding 2.5G. It is based on the International Telecommunication Union (ITU) family of standards under the International Mobile Telecommunications-2000 (IMT-2000).  ITU launched IMT-2000 program, which, together with the main industry and standardization bodies worldwide, targets to implement a global frequency band that would support a single, ubiquitous wireless communication standard for all countries, to provide the framework for the definition of the 3G mobile systems
    • 8.  Microwave wireless links can be used to create a wireless local loop. The local loop can be thought of as the "last mile" of the telecommunication network that resides between the central office (CO) and the individual homes and business in close proximity to the CO. An advantage of WLL technology is that once the wireless equipment is paid for, there are no additional costs for transport between the CO and the customer premises equipment. Many new services have been proposed and this includes the concept of Local Multipoint Distribution Service (LMDS), which provides broadband telecommunication access in the local exchange.
    • 9.  Facilitates ad-hoc data transmission over short distances from fixed and mobile Devices.  Uses a radio technology called frequency hopping spread spectrum. It chops up the data being sent and transmits chunks of it on up to 79 different frequencies.  In its basic mode, the modulation is Gaussian frequency shift keying (GFSK).  It can achieve a gross data rate of 1 Mb/s  Primarily designed for low power consumption, with a short range (power class-dependent: 1 meter, 10 meters, 100 meters) based on low-cost transceiver microchips in each device
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