January 1997
Beginner
435 pages
18h 29m
English
Content preview from Microwave and Wireless Communications Technology
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426 MICROWAVE COMMUNICATIONS
satellite links, ship-to-shore links, two-way voice links, and a variety of other ser-
vices. The system may be a single-channel design, or it may have dozens of chan-
nels multiplexed onto the same microwave carrier.
2. Both time-domain multiplex (TDM) and frequency-domain multiplex
(FDM) are used. Communications transmitters may be AM, SSBSC, FM, PM, or
pulse modulated.
3. Terrestial communications systems operate over line-of-sight distances of
about 50 km; greater distances use relay stations to carry the signal. Relay repeater
stations might be either simplex, half-duplex, or (more commonly) ...
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