13.07.2015 Views

User's Manual - AirLive

User's Manual - AirLive

User's Manual - AirLive

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

13. What is Spread Spectrum?Spread Spectrum technology is a wideband radio frequency technique developed by the militaryfor use in reliable, secure, mission-critical communication systems. It is designed to trade offbandwidth efficiency for reliability, integrity, and security. In other words, more bandwidth isconsumed than in the case of narrowband transmission, but the trade off produces a signal thatis, in effect, louder and thus easier to detect, provided that the receiver knows the parameters ofthe spread-spectrum signal being broadcast. If a receiver is not tuned to the right frequency, aspread –spectrum signal looks like background noise. There are two main alternatives, DirectSequence Spread Spectrum (DSSS) and Frequency Hopping Spread Spectrum (FHSS).31

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!