Modulation - Digital Baseband Modulation or Line Coding

Digital Baseband Modulation or Line Coding

The term digital baseband modulation (or digital baseband transmission) is synonymous to line codes. These are methods to transfer a digital bit stream over an analog baseband channel (a.k.a. lowpass channel) using a pulse train, i.e. a discrete number of signal levels, by directly modulating the voltage or current on a cable. Common examples are unipolar, non-return-to-zero (NRZ), Manchester and alternate mark inversion (AMI) codings.

Line coding (digital baseband transmission)
Main articles
  • Unipolar encoding
  • Bipolar encoding
  • On-off keying
Basic line codes
  • Return to zero (RZ)
  • Non-return-to-zero, level (NRZ/NRZ-L)
  • Non-return-to-zero, inverted (NRZ-I)
  • Non-Return-to-Zero, space (NRZ-S)
  • Manchester
  • Differential Manchester/Biphase (Bi-φ)
Extended line codes
  • Conditioned Diphase
  • 4B3T
  • 4B5B
  • 2B1Q
  • Alternate Mark Inversion
  • Modified AMI code
  • Coded mark inversion
  • MLT-3 encoding
  • Hybrid ternary code
  • 6b/8b encoding
  • 8b/10b encoding
  • 64b/66b encoding
  • Eight-to-fourteen modulation
  • Delay/Miller encoding
  • TC-PAM
Optical line codes
  • Carrier-Suppressed Return-to-Zero
  • Alternate-Phase Return-to-Zero
  • See also: Baseband
  • Baud
  • Bit rate
  • Digital signal
  • Digital transmission
  • Ethernet physical layer
  • Pulse modulation methods
  • Pulse-amplitude modulation (PAM)
  • Pulse code modulation (PCM)
  • Serial communication
  • Category:Line codes

Read more about this topic:  Modulation

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