The present invention is directed to a cognitive radio device. The device includes a spectrum sensing portion configured to identify idle subcarrier blocks corresponding to non-contiguous channels within the plurality of predetermined channels, a mapping portion configured to encode a transmission message signal into a series of transmit frequency domain samples and map each of the transmit frequency domain samples into an idle subcarrier block, the mapping portion being configured to map each of the transmit frequency domain samples into an idle subcarrier block on a symbol-by-symbol basis, a transmit Fourier transformer configured to transform the series of transmit frequency domain samples into a time domain signal corresponding to a transmit RF waveform, and a transmitter portion configured to upconvert the time domain signal and transmit the transmit RF waveform.
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