US 7,206,350 B2 · OFDM multiple sub-channel communication system

Abstract

A transmitter and corresponding method for transmitting an OFDM signal in a communications channel, including a plurality of base-band OFDM modulators, each for modulating a respective data signal onto a plurality of orthogonal sub-carriers and outputting a respective sub-channel OFDM signal; and a fast convolution filter and up-converter for applying fast convolution filtering and digital up-conversion to the sub-channel OFDM signals to output a combined OFDM signal that includes each of the sub-channel OFDM signals, the fast convolution and up-converter filtering each of the sub-channel OFDM signals and frequency shifting all of the sub-channel signals to respective designated frequencies within the combined OFDM signal. A corresponding receiver is also provided.

Claims5

Dependent claims

A receiver for receiving a combined OFDM signal that includes a plurality of sub-channel OFDM signals, the receiver including:

a buffer and FFT for receiving the combined OFDM signal and performing an FFT thereon to output a frequency domain signal, each of the sub-channel OFDM signals occupying assigned frequency ranges within the frequency domain signal;
a plurality of processing chains each associated with a sub-channel and each including:
(i) a fast convolution filter and digital downconverter for extracting from the FFT of the combined OFDM signal the sub-channel OFDM signal occupying the assigned frequency range of the associated sub-channel and performing an IFFT on the extracted sub-channel OFDM signal;
(ii) an OFDM demodulator for demodulating the sub-channel OFDM signal output from the fast convolution and digital downconvertor.

1 more element

Dependencies are inferred from the claim text.

OFDM multiple sub-channel communication system

Life of this patent

OFDM multiple sub-channel communication system

Life of this patent

Abstract

Claims5