Patent ID: 8279745
Filing Date: 2012-10-02
Classification: H04L

Abstract:
1. A transmission system for processing three or more input signals for transmission along a multi-wire cable comprising three or more wires, wherein the multi-wire cable comprises a wire for each input signal, and wherein one of the input signals comprises a null signal, the transmission system comprising: a wire-mapping circuit configured to apply a wire-mapping code matrix to the input signals to generate a wire-mapped signal for each wire such that each wire-mapped signal comprises a different combination of all of the input signals, wherein the wire-mapping circuit comprises a plurality of wire-mapping units, and wherein each wire-mapping unit is configured to apply a unit-specific wire-mapping code matrix to symbols from each of the input signals to generate a component of the wire-mapped signal for each wire, each of the wire-mapped signal components generated by one wire-mapping unit corresponding to one subcarrier or subcarrier group and comprising a different combination of all of the corresponding input symbols; a transmitter configured to generate a transmission signal for each wire based on the corresponding wire-mapped signal, and to drive each wire with the corresponding transmission signal, wherein the transmitter comprises for each wire; a modulator configured to modulate the wire-mapped signal generated for the corresponding wire to generate the transmission signal for the corresponding wire, wherein each modulator comprises a multi-carrier modulator configured to generate a multi-carrier transmission signal for the corresponding wire, said multi-carrier transmission signals each comprising a plurality of subcarriers or subcarrier groups, wherein each multi-carrier modulator comprises an OFDM modulator, and wherein each OFDM modulator is configured to generate an OFDM transmission signal from the wire-mapped signal components corresponding to the respective wire; and a line driver configured to drive the corresponding wire with the corresponding transmission signal; wherein the input signals comprise M input signals, one for each of M wires, where each of the M input signals includes N OFDM subcarriers; wherein the plurality of wire-mapping units comprise N wire-mapping units, each configured to implement an M-point discrete Fourier transform using the corresponding unit-specific wire-mapping code matrix; and wherein the OFDM modulators comprise M OFDM modulators, each configured to generate an OFDM transmission signal from the wire-mapped signal components corresponding to the respective wire using an N-point inverse discrete Fourier transform.