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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12.4 Code division multiple access (CDMA)
or spread spectrum
The extension of pseudo-random key or noise generation is code divi-
sion multiple access or spread spectrum transmission, described in
Chapter 8. The spread spectrum technique provides an extremely high
level of security by reducing the radiated energy at any one frequency
to very little above the ambient noise level by spreading the trans-
mission over a very wide band. The transmitter uses what is in effect
an extended digital key to spread the bandwidth and the receiver is
equipped with an identical key for de-spreading. The transmission
almost disappears into the noise and, without the appropriate key, the
existence of a spread spectrum signal is very difficult to detect.
12.5 Classification ...
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