Thursday, January 10, 2008

Digital Baseband Modulation or Line Coding

The term digital baseband modulation is synonymous to line codes, which are methods to transfer a digital bit stream over an analog lowpass channel using a discrete number of signal levels, by modulating a pulse train (a square wave instead of a sinusoidal waveform). Common examples are unipolar, non-return-to-zero (NRZ), Manchester and alternate mark inversion (AMI) coding.

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