Patent ID: 6990062

Claim:
A discrete multitone (DMT) and orthogonal frequency division multiplex (OFDM) transceiver wherein communication occurs between stations in the form of symbols; the symbols being distributed and transmitted in channels which are allocated when making a link between the stations, each channel supporting a number of bits depending on the spectral response of the link when it is established; said transceiver having a transmit mode where, according to the channel allocations, variable length sequences of bits are encoded and inverse fast Fourier transforms (iFFT's) are normally performed, and a receive mode, in which the received symbols are sampled and fast Fourier transforms (FFT's) are normally performed on the samples to produce a data sequence, said sequence being decoded into variable length sequences; characterised in that only a single FFT, or iFFT operates on real and imaginary parts of the data stream; the outputs of the FFT or iFFT being supplied to a post processing stage for solving simultaneous equations having real and imaginary terms, in order to derive parameters for separating the transmit and receive data.