Direct-sequence spread spectrum: Difference between revisions

Revision as of 20:52, 24 December 2005

Revision as of 20:53, 24 December 2005

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In contrast, [[frequency-hopping spread spectrum]] pseudo-randomly retunes the carrier, instead of adding pseudo-random noise to the data, which results in a uniform frequency distribution whose width is determined by the output range of the [[Pseudo-random number|pseudo-random]] number generator.

'''Comparison of DS SSDSSS and FHFrequency Hopped SS'''

*DSSS

*DS SS

**Flexible support of variable data rates

**High capacity is possible with enhancements (interference cancellation, adaptive antenna, etc.)

**Suffers from near-far effect ⇒ power control required

*FHSS

*FH SS

**Suitable for ad hoc networks (no near-far problem)

**Robust to interference