Function estimate 

pub fn estimate(
    grid: &ResourceGrid,
    rx: &[C64],
    noise_var: f64,
    method: &FrequencyInterpolation,
) -> Result<Vec<C64>>

The channel at every RE of the grid (symbol after symbol) from the received grid rx (the FFT outputs of the active subcarriers), with the noise variance per RE noise_var (used by LMMSE).

Errors

Error::Shape if rx is not a whole grid, Error::Config without pilots.