Patent ID: 6282167
Filing Date: 2001-08-28
Classification: H04L

Abstract:
A method for transmitting and receiving at least two independent source signals, comprising the steps of:obtaining said at least two independent source signals in the form of independent series of coded bits;assignment of a determined frequency band to an OFDM signal to be transmitted, several approximately orthogonal carrier frequencies being defined in said frequency band;breakdown of said frequency band into at least two frequency subbands, each of said subbands comprising a set of said approximately orthogonal carrier frequencies;assignment of each of said frequency subbands to one of said independent source signals;selectively modulating the carrier frequencies of each frequency subband with the coded bits of the corresponding source signal;grouping said modulated frequency subbands to form a modulated OFDM signal;tuning and transmitting the modulated OFDM signal as a whole;receiving the modulated OFDM signal in a receiver;extracting from the modulated OFDM signal at least one, but not all the frequency subbands, by filtering; andperforming demodulation processing solely on the frequency carriers contained in the extracted subbands of the modulated OFDM signal.