Each mobile uses a separate, temporary radio channel to talk to the cell site. The cell site talks to many mobiles at once, using one channel per mobile. Channels use a pair of frequencies for communication. One for transmitting from the cell site, the forward link, and one frequency for the cell site to receive calls from the users, the reverse link.
Communication between mobile units can be either half-duplex or full-duplex. In case of half-duplex, transmit and receive communications between the mobile units are not at the same time, i.e. ta ....etc

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I want full Pdf file about Mobile train radio communication.. So please give the brief explantion about this topic and also pdf file
I want full Pdf file about Mobile train radio communication. ....etc

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VEHICLE INFRASTRUCTURE INTEGRATION (VII) IN THE US “ ENHANCING SAFETY. ENABLING MOBILITY.

ABSTRACT:
VII or Vehicle Infrastructure Initiative is listed as a new DSRC (Dedicated short range communication) protocol, it is more than DSRC, it is a major advancement in ITS for vehicle to vehicle and vehicle to road side system. The 5.9Ghz wave protocol provides the range, throughput capacity and low latency to handle current and future ITS roles and capabilities, Future e-payment system has the potential to provide tolling. Priority toll / ....etc

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Each mobile uses a separate, temporary radio channel to talk to the cell site. The cell site talks to many mobiles at once, using one channel per mobile. Channels use a pair of frequencies for communication. One for transmitting from the cell site, the forward link, and one frequency for the cell site to receive calls from the users, the reverse link. Communication between mobile units can be either half-duplex or full-duplex. In case of half-duplex, transmit and receive communications between the mobile units are not at the same time, i.e. ta ....etc

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Abstract”
Two major objectives are concerned in this paper. On one hand, a multiplicity of typical methodologies available for achieving dual-frequency operation for microstrip patch antennas are summarized and classified into three categories, based on their intrinsic mechanisms. On the other hand, by employing the dual-frequency solutions, microstrip patch antennas are applied to the mobile handsets of the third-generation IMT-2000 system. Two novel microstrip patch antennas with broadband property and miniaturized size have been prop ....etc

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