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Unformatted text preview: patterns should be orthogonal: Perfect orthogonality not possible, undesired signals contribute
some interference. Frequency-hopping CDMA - frequency hopping according to
some code pattern.
802.11 - IEEE wireless standard for short range
communications. It uses direct sequence or frequency hopping.
Frequency hopping - 79 1 mhz channels.
Direct sequence - L = 11-bit chipping sequence.
Mostly for very short range.
Satellites receive signals from earth in a certain frequency
band, retransmit in a different frequency band. Most common is the Geostationary Orbit A satellite has multiple transponders in separate sub- bands.
Also Orbiting Satellites - medium and low orbits....
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- Fall '08