Does zero-forcing equalizer need known channel impulse response?

1. What is the frequency response of the zero-forcing equalizer?
2. What is the drawback of the zero-forcing equalizer?
3. What is the use of zero forced equalizers in digital communication?
4. What is zero forcing technique?

What is the frequency response of the zero-forcing equalizer?

The Zero-Forcing Equalizer applies the inverse of the channel frequency response to the received signal, to restore the signal after the channel [21]. The name Zero Forcing corresponds to bringing down the intersymbol interference (ISI) to zero in a noise free case.

What is the drawback of the zero-forcing equalizer?

In reality, zero-forcing equalization does not work in most applications, for the following reasons: Even though the channel impulse response has finite length, the impulse response of the equalizer needs to be infinitely long. At some frequencies the received signal may be weak.

What is the use of zero forced equalizers in digital communication?

2.1 Zero Forcing (ZF)

The names zero forcing corresponds to bringing down to inter-symbol interference to zero in a noise free case. This will be useful when ISI is significant compared to noise. Zero-forcing equalizers ignore the additive noise and may significantly amplify noise for channels with spectral nulls.

What is zero forcing technique?

Zero-forcing (or null-steering) precoding is a method of spatial signal processing by which a multiple antenna transmitter can null the multiuser interference in a multi-user MIMO wireless communication system.