Patent ID: 7031251
Filing Date: 2006-04-18
Classification: H04L

Abstract:
1. A method, comprising: (a) transforming a received orthogonal frequency division multiplexed (OFDM) signal from a transmission channel into the frequency domain, the OFDM signal having been subject to a clipping function prior to transmission in order to reduce the peak-to-average power ratio (PAPR); (b) recovering data symbols from the transformed OFDM signal, which include clipping noise; (c) subjecting the data symbols to substantially the same clipping function to which the OFDM signal had been subject to prior to transmission to produce clipped data symbols; (d) attenuating the data symbols; (e) subtracting the attenuated data symbols from the clipped data symbols to estimate the clipping noise in the frequency domain based on the data symbols; and (f) subtracting the estimated clipping noise from the transformed OFDM signal.