What is the difference between pulse shaping and equalizers when used to cancel Inter-symbol Interference (ISI)?

11 August 2018 0 2K Report

According to Nyquist, to transmit R symbols/sec without ISI, the minimum bandwidth required is R/2 Hz, and the sinc pulse shape satisfies this condition.

1. If we use equalizers instead of pulse shaping, do we need to keep this condition ( minimum R/2 Hz to transmit R symbols/sec)?

2. If we use equalizers, should the total system transfer function be of the sinc function shape, thus equivalently achieve the Nyquist condition?

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