L15-x1rev

Ideally code patterns should be orthogonal perfect

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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. Communication Satellites 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....
View Full Document

Ask a homework question - tutors are online