1. A method of estimating noise variance within an OFDM receiver, the method comprising: evaluating a noise estimate for each of a plurality of pilots within one or more received OFDM symbols; dividing the plurality of pilots into bands; calculating a noise variance estimate for each band by averaging noise estimates for pilots within the band; storing the noise variance estimate for each band in memory; setting a noise variance estimate for a pilot equal to the calculated noise variance estimate for the band which includes the pilot; and determining a noise variance estimate for a data sub-carrier within the one or more received OFDM symbols by interpolating between the noise variance estimates for each pilot.