Line coding - NTNU

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Impulse response for DC cutoff, simulation example illustrating baseline wander Cosine rolloff 100% + H( f )= j j +2 0.02 3 dB cutoff frequency: 0.02/T =T/(2·0.02)=7.96T Digital Communication, Line codes and scrambling IET, NTNU 11 Eye curve for NRZ code with DC cutoff Cosine rolloff 100% + H( f )= j j +2 0.02 NRZ is an unbalanced line code ): serious baseline wander Digital Communication, Line codes and scrambling IET, NTNU 12
Eye curve for AMI code with DC cutoff Cosine rolloff 100% + H( f )= j j +2 0.02 AMI is a balanced line code ): small ISI Digital Communication, Line codes and scrambling IET, NTNU 13 Power spectrum of a line code Transmitted signal: X(t) = a k g(t kT) k= Power spectrum: S X ( f ) = 1 T S a (e j 2 fT ) G( f ) 2 S a (z) : Time discrete power spectrum of sequence {a k } Digital Communication, Line codes and scrambling IET, NTNU 14
Page 1 and 2: Presentation in course TTT4130 Digi
Page 3 and 4: Example, 4B3T code The 4B3T code is
Page 5: DC-balance Most transmission system
Page 9 and 10: Power spectrum AMI code Digital Com
Page 11 and 12: One alternative of a 4B3T code Digi
Page 13 and 14: Duobinary partial response y k = c
Page 15 and 16: Scrambling • Most transmission sy
Page 17 and 18: Applications of scrambling • Echo

Line coding - NTNU

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