Why should ls channel estimation be interpolated?

Artificially increase the resolution of the image.

A method to increase the pixel size of an image without generating pixels. Based on the color of surrounding pixels, the color of missing pixels is calculated by mathematical formula. Some cameras use interpolation to artificially increase the resolution of images.

According to the type of input data, channel estimation algorithms can be divided into time domain and frequency domain methods. Frequency domain method is mainly aimed at multi-carrier systems, and time domain method is suitable for all single-carrier and multi-carrier systems. It estimates the fading coefficients of multipath components in fading channels by referring to the statistical characteristics of signals or transmission data.