1. A method for noise variance estimation in an OFDM system comprising: receiving a first multi-sample symbol (t−1); receiving a second multi-sample symbol (t); converting at least one of the first received multi-sample symbol and the second received multi-sample symbol to give the symbols identical transmission values; subtracting the first multi-sample symbol from the second multi-sample symbol to produce a set of noise samples {circumflex over (n)} using: n ^ k , i ⁡ ( t ) = a k * ⁡ ( t )  a k ⁡ ( t )  2 * r k , i ⁡ ( t ) - a k * ⁡ ( t - 1 )  a k ⁡ ( t - 1 )  2 ⁢ r k , i ⁡ ( t - 1 ) , where i is the receive chain, and k is subcarrier; estimating a noise variance from the set of noise samples; and applying the noise variance estimate to process data provided to a user.