A digital communication system suffers from inter-symbol interference (ISI) due to multi-path propagation. If the transmitter applies a zero-forcing equalizer, which consequence follows regarding noise?

💡 Explanation

Zero-forcing equalizers attempt to invert the channel response completely. Because the inverse channel often has high gain at frequencies where the channel has low gain (high noise), this leads to significant noise amplification at those frequencies; therefore, the equalizer amplifies the noise, rather than mitigating it uniformly.

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