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Direct Sequence Spread Spectrum (DSSS)
Prepared by
Dr.G.Gangadevi
Direct Sequence Spread Spectrum
(DSSS)
• Each bit represented by multiple bits using spreading code
• Spreading code spreads signal across wider frequency band
– In proportion to number of bits used
– 10 bit spreading code spreads signal across 10 times bandwidth of 1
bit code
• One method:
– Combine input with spreading code using XOR
– Input bit 1 inverts spreading code bit
– Input zero bit doesn’t alter spreading code bit
– Data rate equal to original spreading code
• Performance similar to FHSS
Direct Sequence Spread Spectrum
Example
Direct Sequence Spread Spectrum
Transmitter
Direct Sequence Spread Spectrum
Transmitter
Direct Sequence Spread Spectrum
Using BPSK Example

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Direct Sequence Spread Spectrum-DSSS.pdf

  • 1. Direct Sequence Spread Spectrum (DSSS) Prepared by Dr.G.Gangadevi
  • 2. Direct Sequence Spread Spectrum (DSSS) • Each bit represented by multiple bits using spreading code • Spreading code spreads signal across wider frequency band – In proportion to number of bits used – 10 bit spreading code spreads signal across 10 times bandwidth of 1 bit code • One method: – Combine input with spreading code using XOR – Input bit 1 inverts spreading code bit – Input zero bit doesn’t alter spreading code bit – Data rate equal to original spreading code • Performance similar to FHSS
  • 3. Direct Sequence Spread Spectrum Example
  • 4. Direct Sequence Spread Spectrum Transmitter
  • 5. Direct Sequence Spread Spectrum Transmitter
  • 6. Direct Sequence Spread Spectrum Using BPSK Example