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 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, wherein said frequency-domain filtering and scaling is implemented by the following relation: h ^ ( k ) = S ( k ) ⁢ ∑ m = - ⌊ M CE / 2 ⌋ ⌊ M CE / 2 ⌋ ⁢ ⁢ w m ⁢ h ⋒ ( k + m ) ( 4 ) wherein ĥ (k) represents ones of said refined channel estimates for said plurality of sub-carriers, wherein k represents ones of said plurality of sub-carriers, and M CE represents a predetermined number of neighboring ones of said plurality of sub-carriers for estimating each of said plurality of sub-carriers, wherein ĥ (k) =0 for k<−N a /2 or k>N a /2, wherein N a represents a total number of said plurality of sub-carriers, {w m } represents said single filter coefficient vector having said plurality of frequency-domain filter coefficients, ĥ (k) represents intermediate least-squares based channel estimate for the sub-carrier k, and S (k) is a scale factor for said scaling.