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Digital Transmission over Baseband Channels

Module by: Roy Ha, Mohammad Borran, Dinesh Rajan

Summary: (Blank Abstract)

Consider the problem of transmitting information over a channel that is bandlimited. Further consider the passband of the channel to be around zero. The channel is best modeled as

Figure 1
()

The received signal is given by

r t =∫-∞∞ X τ gt-τdτ+ N t = Y t + N t r t τ X τ g t τ N t Y t N t (1)
As a consequence of the bandlimited nature of the channel, Y t Y t is no longer a time limited signal. As a result, each symbol period is larger than TT and the signal from one symbol period interferes with symbols in other time periods. This aliasing of signals is refered to as intersymbol interference (ISI).

Pulse Amplitude Modulation (PAM)

I am a cigar.

Pulse Position Modulation (PPM)

I am not a cigar.

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