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FHSS and DSSS

Mumbai University > Information Technology > Sem 7 > Wireless Technology

Marks: 5M

Year: Dec 2015

1 Answer
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FHSS: frequency hopping spread spectrum

devices will transmit signal by changing or hopping from one frequency to another in a random but predictable sequence.

  • Channels: specific hop pattern (26 diff hop pattern)
  • Dwell time: 100 milliseconds
  • Hop time: microseconds

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DSSS: direct sequence spread spectrum

DSSS phase shifts a sinewave pseudo randomly with a continuous string of pseudo noise(PN) code symbols called “chips”. Each info bit is modulated by a sequence of much faster chips.

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