July 2002
Intermediate to advanced
344 pages
8h 37m
English
Content preview from Newnes Radio and RF Engineering Pocket Book, 3rd Edition
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13 Multiplexing
Multiplexing enables several information (speech or data) channels
to be carried simultaneously over one bearer, a wide band, single
frequency microwave radio link for example. Both frequency and
time division multiplex are common methods. On trunked radio sys-
tems where channels are allocated to users on demand the multi-
plexing is referred to as frequency- or time-division multiple access
(FDMA, TDMA).
Frequency division multiplexing (FDM) used to be a common
technique for sharing analogue trunk circuits between 12 (or mul-
tiples of 12) separate channels. This is an analogue technique that
been superseded by the use of digital trunk ...
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