Reduced complexity multicarrier precoder

For use in a multicarrier communication system that transmits through a band-limited wireline communication channel a sequence of N-element time domain signal vectors, where N is an integer, an apparatus comprising:

• a processor;
• a computer readable storage medium;
• a software instantiated in the computer readable storage medium, the software comprising:
• a first function that causes one or more training signals to be sent through the wireline communication channel to a far-end receiver to cooperatively estimate a set of channel parameters for a parametric model;
• a second function that causes a set of precoder parameters to be computed at least partially based upon the channel parameters, wherein the precoder parameters operated in a transform domain of an orthogonal transform;
• a third function that causes each of a set of frequency-domain encoded data blocks to be transformed to a set of precoded data vectors, wherein the third function comprises:
• a fourth function that computes a precoding mathematical operation computed in an orthogonal transform domain wherein a substantial number of precoding cross terms are eliminated to thereby avoid the need to compute one or more order-of-N-squared matrix multiplication operations;
• and
• a fifth function that causes the time domain signal vectors to be transmitted onto the band-limited wireline communication channel to be received by a far-end receiver.

In a multicarrier communication system that transmits through a band-limited wireline communication channel a sequence of N-element time domain signal vectors, where N is an integer, a method comprising;

• obtaining a parametric channel model for the band limited wireline communication channel;
• precoding each of a set of frequency-domain encoded data blocks using a precoder to derive a set of precoded data vectors, the precoder comprising a set of precoder parameters which are each at least partially derived from the parametric channel model;
• transforming each of the precoded data vectors to a respective one of the time domain signal vectors;
• and
• transmitting, back to back without a time domain guard interval, the time domain signal vectors onto the band-limited wireline communication channel to be received by a far-end receiver;
• wherein the precoder parameters are selected and the precoding is performed to compensate for time-domain inter-vector interference that would otherwise be introduced by transmitting the time domain signal vectors through the band limited wireline communication channel

In a communication system involving a multicarrier signal comprising a plurality of individual tones, wherein the communication system transmits the multicarrier signal through a band-limited wireline communication channel as a sequence of N-element time domain signal vectors, where N is an integer, a method comprising;

• sending training signals through the wireline communication channel to a far-end receiver to assist in the estimation of a set of channel model parameters;
• precoding each of a set data blocks using a precoder to derive a set of precoded data vectors, the precoder comprising a set of precoder parameters which are each at least partially derived from the channel model parameters;
• transforming each of the precoded data vectors to a respective one of the time domain signal vectors;
• and transmitting, back to back without a time domain guard interval, the time domain signal vectors onto the band-limited wireline communication channel to be received by a far-end receiver;
• wherein the precoding is performed to compensate for time-domain inter-vector interference that would otherwise be introduced by transmitting the time domain signal vectors through the band limited wireline communication channel;
• and