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13. What is Spread Spectrum
？
Spread Spectrum technology is a wideband radio frequency technique developed
by the military for use in reliable, secured, mission-critical communication
systems. It is designed to trade off bandwidth efficiency for reliability, integrity,
and security. In other words, more bandwidth is consumed than in the case of
narrowband transmission, but the trade off produces a signal that is, in effect,
louder and thus easier to detect, provided that the receiver knows the
parameters of the spread-spectrum signal being broadcast. If a receiver is not
tuned to the right frequency, a spread –spectrum signal would look like
background noise. There are two main types: Direct Sequence Spread Spectrum
(DSSS) and Frequency Hopping Spread Spectrum (FHSS).
