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Pulse Generation
   Generalized form of
correlative-level
coding
(partial response signaling)
Figure 7.18




         EE 541/451 Fall 2006
Duobinary signaling
   Duobinary signaling (class I partial response)




          EE 541/451 Fall 2006
Example
   Duobinary Pulse
    – p(nTb)=1, n=0,1
    – p(nTb)=1, otherwise


   Interpretation of received signal
    – 2: 11
    – -2: 00
    – 0: 01 or 10 depends on the previous transmission




          EE 541/451 Fall 2006
Duobinary signal and Nyguist Criteria
   Nyguist second criteria: but twice the bandwidth




          EE 541/451 Fall 2006
Differential Coding
   The response of a pulse is spread over more than one signaling
    interval.
   The response is partial in any signaling interval.
   Detection :
    – Major drawback : error propagation.
   To avoid error propagation, need deferential coding (precoding).




          EE 541/451 Fall 2006
Modified duobinary signaling
   Modified duobinary signaling
    – In duobinary signaling, H(f) is nonzero at the origin.
    – We can correct this deficiency by using the class IV partial
      response.




         EE 541/451 Fall 2006
Modified duobinary signaling
   Spectrum




         EE 541/451 Fall 2006
Modified duobinary signaling
   Time Sequency: interpretation of receiving 2, 0, and -2?




          EE 541/451 Fall 2006
Tradeoffs
   Binary data transmission over a physical baseband channel can
    be accomplished at a rate close to the Nyquist rate, using
    realizable filters with gradual cutoff characteristics.
   Different spectral shapes can be produced, appropriate for the
    application at hand.
   However, these desirable characteristics are achieved at a price :
    – A large SNR is required to yield the same average probability of
      symbol error in the presence of noise.




          EE 541/451 Fall 2006

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Du binary signalling

  • 1. Pulse Generation  Generalized form of correlative-level coding (partial response signaling) Figure 7.18 EE 541/451 Fall 2006
  • 2. Duobinary signaling  Duobinary signaling (class I partial response) EE 541/451 Fall 2006
  • 3. Example  Duobinary Pulse – p(nTb)=1, n=0,1 – p(nTb)=1, otherwise  Interpretation of received signal – 2: 11 – -2: 00 – 0: 01 or 10 depends on the previous transmission EE 541/451 Fall 2006
  • 4. Duobinary signal and Nyguist Criteria  Nyguist second criteria: but twice the bandwidth EE 541/451 Fall 2006
  • 5. Differential Coding  The response of a pulse is spread over more than one signaling interval.  The response is partial in any signaling interval.  Detection : – Major drawback : error propagation.  To avoid error propagation, need deferential coding (precoding). EE 541/451 Fall 2006
  • 6. Modified duobinary signaling  Modified duobinary signaling – In duobinary signaling, H(f) is nonzero at the origin. – We can correct this deficiency by using the class IV partial response. EE 541/451 Fall 2006
  • 7. Modified duobinary signaling  Spectrum EE 541/451 Fall 2006
  • 8. Modified duobinary signaling  Time Sequency: interpretation of receiving 2, 0, and -2? EE 541/451 Fall 2006
  • 9. Tradeoffs  Binary data transmission over a physical baseband channel can be accomplished at a rate close to the Nyquist rate, using realizable filters with gradual cutoff characteristics.  Different spectral shapes can be produced, appropriate for the application at hand.  However, these desirable characteristics are achieved at a price : – A large SNR is required to yield the same average probability of symbol error in the presence of noise. EE 541/451 Fall 2006