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7. Baseband Digital Transmission

7. Baseband Digital Transmission Baseband Transmission is the simplest form for the communication of information is communicated with specific symbols selected from a finite set ofsymbols. In Baseband Transmission , symbols are simply communicated as a pulse with a discretevoltage level and, for binary Transmission , only two voltages are used. A series of pulses forms apulse train that carries the full message. Prior to Transmission , especially in radio systems, thesepulses are shaped to limit their high frequency content so as to minimize crosstalk with adjacentcommunication channels. During Transmission through a bandlimited channel, pulses aredispersed (spread) in time and can overlap with each other giving rise to intersymbol interference(ISI). When pulses reach the receiver, dispersion and other distortions can be partiallycompensated with an impulse response IN A BANDLIMITED CHANNELWe first consider a series of narrow symbol pulses.

Additionally, an ideal filter must have an impulse response that extends to infinite time before and after the pulse peak and, if the filter is to be causal (output response occurs after the input is applied), the peak output would occur an infinite time after the input. This would

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people.ee.duke.edu

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