System Implementation

• Modulation: on/off keying

• Errors due to: thermal, shot noise and

multi-access interference

• LED: Gaussian shaped spectrum
  • Codes appear as being multilevel
  • Codes orthogonality can be lost
  • Solutions: - Nonbinary amplitude masks

• - Equalize spectrum

• - Reduce encoded bandwidth

• Programmable amplitude masks in the transmitter

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