1. A noise estimation filter for an orthogonal frequency-division multiplexed (OFDM) system, comprising: a filter bank module for multiplying a unitary vector by an OFDM signal vector to generate scalar products of the OFDM signal vector; a coefficient squaring module for squaring the scalar products and weighting the scalar products to generate a plurality of weighted single estimates; and a summing module for summing the weighted single estimates to generate a noise and interference power estimate.