Back to results
US 2003/0227967 A1Published application
System and method for time-domain equalization in discrete multi-tone system
OwnerChin-Liang Wang, Yuan-Shuo Chang +1inventors
InventorsChin-Liang Wang, Yuan-Shuo Chang, Chih-Ming Hsu
Life of this patent
Estimating the term…
Abstract
A novel structure for the TEQ in a DMT system receiver to shorten the length of the effective channel impulse response is provided. A time-domain equalizer, based on the decision-feedback filter structure, along with a training method is disclosed. In accordance with the DFE-based TEQ in the DMT system, the data symbols that transmitted through the effective shortened channel would be more reliable.
Claims25
A time-domain equalizer system, comprising;
- QAM silicers for converting the output of FEQ to the corresponding signal in the QAM constellation for each subcarrier;
- an IFFT for inverse fast Fourier transforming data generated by QAM slicers;
- a Paraller/Serial converter (P/S) for converting said IFFT output data into a serial form;
- a feedforward filter (FF) for whitening the received noises and producing an overall effective channel response such that the output only has causal components;
- a feedback filter (FB) for reconstructing the residual causal ISI by using the past decisions;
- a delay line for buffering the signals to the input of the feedback filter;
- and
- a switch for connecting the input end of said delay line to a first node.
5 more elements
A time-domain equalizer system, comprising
- a feedforward filter(FF) for whitening the received noises and producing an overall effective channel response such that the output only has causal components;
- a feedback filter(FB) for reconstructing the residual causal ISI by using the past decisions;
- and
- a delay ling for buffering the signals to the input of the feedback filter.
1 more element
A training method of TEQ, comprising the steps
- a) fixing the feedforward and feedback filters, and updating a TIR filter in a frequency domain;
- b) performing a windowing operation on said TIR in a time domain to limit the taps outside the window of length v+1 to be zero;
- c) fixing said TIR and updating said feedforward and feedback filter in said frequency domain;
- and
- d) performing said windowing operations on said feedforward and feedback filters in said time domain to limit them to only Na and Nb consecutive non-zero taps, respectively.
2 more elements
Dependencies are inferred from the claim text.