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Introduction to GSM

Introduction to GSM Book
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Frequency Hopping - FH Frequency Hopping - FH
A radio transmission process where a message or voice communications are sent on a radio channel that regularly changes frequency (hops) according to a predetermined code. The receiver of the message or voice information must also receive on the same frequencies using the same frequency hopping sequence. Frequency hopping was first used for military electronic countermeasures. Because radio communication occurs only for brief periods on a radio channel and the frequency hop locations are only known to authorized receivers of the information, frequency hopping signals are difficult to detect or monitor.
Frequency Hopping - FH Frequency Hopping Operation
Frequency Hopping Operation
This diagram shows a simplified diagram of how a frequency hopping system transfers information (data) from a transmitter to a receiver using many communication channels. This diagram shows a transmitter that has a preprogrammed frequency tuning sequence and this frequency sequence occurs by hopping from channel frequency to channel frequency. To receive information from the transmitter, the receiver uses the exact same hopping sequence is used. When the transmitter and receiver frequency hopping sequences occur exactly at the same time, information can transfer from the transmitter to the receiver. This diagram shows that after the transmitter hops to a new frequency, it transmits a burst of information (packet of data). Because the receiver hops to the same frequency, it can receive the packet of data each time.
Physical Channels, Logical Channels, Network Functions, and Operation GSM Books
Introduction to GSM Book
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 Introduction to GSM
This book explains the basic components, technologies used, and operation of GSM systems. This book starts with the system components and basic services that the GSM system can provide. You will learn that the key types of GSM devices include single mode and dual mode mobile telephones, wireless PCMCIA cards, embedded radio modules, and external radio modems. You will then discover the different types of available services such as multiple types of voice services, data services, group call, and messaging services.

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