1. A method of channel estimation, comprising: receiving a signal after transmission over a media, said signal having a plurality of sub-carriers in a frequency band; preprocessing said signal including performing a fast Fourier transform (FFT) to generate a plurality of frequency-domain samples, and; channel estimating said plurality of frequency-domain samples using (i) least squares (LS) estimation to generate intermediate LS channel estimates for each of said plurality of sub-carriers, and (ii) frequency-domain filtering and scaling said intermediate LS channel estimates, wherein said frequency-domain filtering uses a common frequency-domain filter consisting of a single filter coefficient vector having a plurality of frequency-domain filter coefficients to generate refined channel estimates for each of said plurality of sub-carriers.