CELLULAR MOBILE COMMUNICATION
CELLULAR MOBILE COMMUNICATION1UNIT IINTRODUCTION TO WIRELESS MOBILE COMMUNICATION2Introduction: In1897,GuglielmoMarconifirstdemonstrated radio sabilitytoprovidecontinuouscontactwithsh ipssailingtheEnglishchannel. Duringthepast10years,fueledby DigitalandRFcircuitfabricationimprovemen ts NewVLSItechnologies Otherminiaturizationtechnologies( ,passivecomponents) Themobilecommunicationsindustryhasgrownb yordersofmagnitude. of MOBILE Radio Communications4 In1934,AMmobilecommunicationsystemsformu nicipalpoliceradiosystems. Vehicleignitionnoisewasamajorproblem. In1946,FMmobilecommunicationsforthefirst publicmobiletelephoneservice Eachsystemusedasingle,high-poweredtransm itterandlargetowertocoverdistancesofover 50km.
ETSI’s 20 Mbps HIPER LAN: Standard for indoor Wireless Networks IMT-2000 [International Mobile Telephone-2000 Standard]: A 3G universal, multi-function, globally compatible Digital Mobile Radio Standard is in making Satellite-based Cellular Phone Systems A very good Chance for Developing Nations to Improve their Communication Networks 22
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