Patent ID: 7280469

Claim:
A broad bandwidth, high data rate communications system comprising a transmitter employing Inverse Fast Fourier Transform and a receiver employing Fast Fourier Transform, the transmitter having means for dividing the bandwidth into a plurality of sub-bands each for a respective one of a corresponding plurality of sub-band signals, each of the sub-band signals being modulated with a respective portion of input data to be transmitted; and means for performing Inverse Fast Fourier Transform (IFFT) upon the sub-band signals using, for each sub-band signal, a respective one of a plurality of different IFFTs, combining the transformed sub-band signals and transmitting the combined transformed signals to the receiver; the receiver having means for receiving the combined transformed sub-band signals, separating the sub-band signals and performing forward Fast Fourier Transform thereupon individually using, for each transformed sub-band signal, a respective one of a plurality of different FFTs corresponding to those in the transmitter.