Baseband Pulse and Digital Signaling Definitions If bits
Baseband Pulse and Digital Signaling
Definitions If bits are encoded into one symbol Baud Rate D = N/To (# Symbols per unit of time) Bit Rate R = l. D (# Bits per unit of time, assuming l bits per symbol) Also Baud Rate D = 1/Tsymbol (The frequency at which symbols are sent) Bit Rate R = l/Tsymbol (The frequency at which bits are sent)
Desirable properties of a line code Self-Synchronization Low Probability of bit error Spectrum suitable for channel Transmission bandwidth Error detection capability Transparency
The advantage over analog communication is that the signal is cleaned before retransmission. The filter reduces noise and equalizes for ISI In general, unipolar, polar and bipolar will work when there are sufficient number of alternating 1’s and 0’s. Other techniques required when these conditions are not met (Scrambling, Manchester).
Works for unipolar RZ if square law device is eliminated
http: //www. cardinalxtal. com/static/frontend/files/c ardinal-phase-lock-loop-basics. pdf
In general, unipolar, polar and bipolar will work when there are sufficient number of alternating 1’s and 0’s. Other techniques required when these conditions are not met (Scrambling, Manchester).
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