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Book
Year: 1990 Publisher: Santa Monica, CA : RAND Corporation,
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This report presents the results of an investigation of the technical feasibility of establishing a nationwide digital network using commercial AM radio broadcast stations that can support both voice and data transmission. The proposed network, called AMBER (AM broadcast emergency relay), is meant to support emergency communications for civilian and military users when other communication facilities are not available. The authors describe AMBER assets and users; consider key network issues and technical considerations; present preliminary cost estimates; describe the AMBER data link; and discuss a large-scale, nationwide computer simulation that has been developed for AMBER at RAND, including the propagation and noise models incorporated into this simulation and the methodology, host computer, and components of the AMBER simulation. The report concludes with a study of the connectivity of an illustrative network.
Civil defense --- Emergency communication systems --- Radio relay systems --- Radio stations --- United States --- Armed Forces --- Communication systems.
Book
Year: 1996 Publisher: Santa Monica, Calif. : RAND Corporation,
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This report presents the results of a theoretical analysis of a frequency-hopping, multiple-frequency-shift-keyed, spread-spectrum communication system using a nonprocessing communication satellite transponder. A large number of users are assumed to be hopping pseudo-randomly about the transponder passband in time synchronization and approximate frequency synchronization. The users are assumed to be free to hop independently with the result that they occasionally interfere with one another. Formulations are presented that permit assessment of the level of mutual interference, thereby facilitating the selection of system parameters that will maximize the communication throughput of the system.
Military telecommunication --- Artificial satellites in telecommunication --- Radio --- Spread spectrum communications. --- Computer simulation. --- Interference --- United States --- Armed Forces --- Communication systems.
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