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Baseband Pulse and Digital Signaling

Baseband Pulse and Digital Signaling. Definitions. If bits are encoded into one symbol Baud Rate D = N/T o (# Symbols per unit of time) Bit Rate R = lD (# Bits per unit of time, assuming l bits per symbol) Also Baud Rate D = 1/T symbol (The frequency at which symbols are sent)

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Baseband Pulse and Digital Signaling

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  1. Baseband Pulse and Digital Signaling

  2. Definitions • If bits are encoded into one symbol • Baud Rate D = N/To(# Symbols per unit of time) • Bit Rate R = lD(# 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)

  3. Desirable properties of a line code • Self-Synchronization • Low Probability of bit error • Spectrum suitable for channel • Transmission bandwidth • Error detection capability • Transparency

  4. 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).

  5. Works for unipolar RZ if square law device is eliminated Works for unipolar RZ if square law device is eliminated

  6. http://www.cardinalxtal.com/static/frontend/files/cardinal-phase-lock-loop-basics.pdfhttp://www.cardinalxtal.com/static/frontend/files/cardinal-phase-lock-loop-basics.pdf

  7. 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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