Abstract: Methods of estimating the signal-to-noise ratio (SNR) of a signal in an orthogonal frequency division multiplexed (OFDM) system include the steps of representing the signal as a complex symbol and rotating the complex symbol in a complex plane so that the signal component of the function lies substantially on the real axis of the complex plane and the noise function lies substantially on the imaginary axis of the complex plane. By obtaining the means squared value of the complex symbol and the variance of the complex symbol and dividing them, an estimate for the SNR of the signal is obtained.