Baseband Digital Transmission

In this chapter we begin the specific studies about digital communications by studying one of its simplest forms: the baseband transmission. We start with some definitions, followed by a discussion on typical baseband waveforms and multi-amplitude signaling. Then we develop the optimum receiver for detecting a received signal corrupted by additive, white Gaussian noise, followed by the performance analysis of such receiver. Channel distortions are studied in the sequel, with focus on intersymbol interference. Partial response signaling is then addressed as a means of achieving minimum bandwidth requirements. Finally, channel equalization is put into focus as a means for compensating for fixed or time-varying channel distortions.

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