Multiple channel interference cancellation

In a multi-channel environment, a method for canceling interference in two or more received signals arriving over two or more channels at a first communication device from a second communication device comprising:

• receiving two or more outgoing signals, wherein the two or more outgoing signals are to be transmitted from the second communication device to the first communication device over two or more channels which connect the first communication device and the second communication device;
• converting the two or more outgoing signals to a transform domain to create one transform domain signal for each channel;
• distributing the transform domain signal for each channel to a multiplier associated with each channel;
• processing, with the multiplier, the one transform domain signal from each channel with weighting variables to generate two or more cancellation signals in the transform domain;
• combining the two or more cancellation signals in the transform domain to create a combined transform domain cancellation signal;
• converting the combined transform domain cancellation signal out of the transform domain using one inverse transform unit associated with each channel to obtain a cancellation signal for each channel;
• and
• combining the cancellation signal for each channel with the signal received on each channel to cancel interference.

A cancellation system for reducing interference in a received signal in a communication system using four channels to communicate between two communication devices, wherein the cancellation system for each channel comprises:

• inputs for receiving four outgoing signals at a first transceiver, the outgoing signal in a first domain are to be transmitted to a single communication device;.
• four transform units configured to manipulate the four outgoing signals into four second domain signals and distribute the four second domain signals to at least one multiplier associated with each channel;
• one or more multipliers associated with each channel configured to receive the distributed second domain signal from each channel and multiply the second domain signal with one or more weighting variables to create four cancellation signals in the second domain;
• four inverse transform units configured to perform an inverse transform on the four cancellation signals in the second domain to create a cancellation signal in the first domain;
• and
• four subtractors configured to subtract a cancellation signal that is in the first domain from one of the four a received signals.

A cancellation system for use in a first transceiver at a first location and a second transceiver at a second location which communicate there between over two or more channels to cancel unwanted coupling comprising:

• two or more inputs, wherein each input provides an outgoing signal to the cancellation system wherein the outgoing signals are outgoing to the first transceiver;
• one transform unit associated with each channel, wherein each transform unit is configured to convert an outgoing signal from a channel to a transform domain to create one transform domain signal per channel;
• one or more multipliers, wherein each multiplier is configured to receive one transform domain signal from each channel and multiply the outgoing signal from each channel in the transform domain with a weighting variable to create one or more cancellation signals in the transform domain;
• one or more devices configured to combine two or more cancellation signals in the transform domain to create a combined cancellation signal in the transform domain for each channel;
• and
• a inverse transform unit associated with each channel configured to receive the combined cancellation signal and reverse the processing of the transform units, to create two or more cancellation signals;
• two or more combining junctions configured to combine the two or more cancellation signal with two more incoming signals, wherein the incoming signals arrive from the second transceiver.

A method for generating a cancellation signal in a cancellation system, wherein said method occurs within a multi-channel communication system comprising:

• receiving at a cancellation system two or more signals, wherein the two or more signals relate to one or more outgoing signals on the two or more channels in the multi-channel communication system, and wherein the two or more outgoing signals on the two or more channels are transmitted from a first communication device to a second communication device connected by the two or more channels;
• performing a single transform operation on each of the two or more signals to convert each of the two or more signals into a transform domain;
• distributing the two or more signals in the transform domain to a multipliers associated with each of the channels;
• multiplying the two or more signals in the transform domain by one or more weighting variables to create one or more multiplier outputs;
• combining the one or more multiplier outputs associated with each channel to create a combined transform domain cancellation signal, wherein the transform domain cancellation signal is associated with a channel;
• and
• performing a single inverse transform operation on each of the transform domain cancellation signals to remove the cancellation signal from the transform domain and thereby create the cancellation signal for each channel.