A method of orthogonal frequency-division multiplex communication is provided. The method determines the SNR for each of the subchannels (30). The method then designates a subchannel (30) as clear (93) when its SNR is greater than a first threshold (70), as impeded (95) when its SNR is less than the first threshold and greater than a second threshold, and as obstructed (111) when its SNR is less than both the thresholds. The method then transmits OFDM data (34) so that each of the clear subchannels receives the OFDM data (34) at the maximum subchannel signal level (40), each of the impeded subchannels receives the OFDM data (34) at an intermediate signal level (42), and each of the obstructed subchannels receives the OFDM data (34) at zero subchannel signal level (44).
