Direct Sequence Spread Spectrum Radio

Direct Sequence Spread Spectrum Radio
Direct sequence spread spectrum combines a data signal at the sending station with a higher
data rate bit sequence, which many refer to as a chipping code (also known as a processing
gain). A high processing gain increases the signal’s resistance to interference. The minimum
linear processing gain that the FCC allows is 10, and most commercial products operate
under 20. The IEEE 802.11 Working Group has set its minimum processing gain requirement
at 11 chips.  In most cases, frequency hopping is the most cost-effective type of wireless LAN to deploy if
the need for network bandwidth is 2Mbps or less. Direct sequence, having higher potential
data rates, would be best for bandwidth-intensive applications.