Patent ID: 7672381

Claim:
A method of orthogonal frequency-division multiplex (OFDM) communication via a plurality of subchannels within a noncontiguous wideband channel, said method comprising: receiving a reference signal transmitted over each subchannel in said plurality of subchannels within said wideband channel; producing a modulation profile of said wideband channel, wherein said modulation profile is responsive to a signal-to-noise ratio (SNR) for each subchannel in said plurality of subchannels within said wideband channel, wherein said producing activity comprises establishing a least-SNR requirement, determining said SNR for each of said subchannels in said plurality of subchannels within said wideband channel, and designating each of said subchannels having an SNR greater than said least-SNR requirement as a clear subchannel; and transmitting OFDM data in response to said modulation profile.