Equalizer for time domain signal processing
OwnerJingsong Xia, Richard Citta +2inventors
InventorsJingsong Xia, Richard Citta, Scott LoPresto, Wenjun Zhang
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Abstract
A digital equalizer comprises a matched filter that, in conjunction with an FIR filter, assures a single peak with substantially greater energy than other peaks caused by ghosts, thereby permitting synchronization even with multiple, arbitrarily strong ghosts caused by strong multipathing, multiple transmitters, or both.
Claims9
A digital equalizer comprising:
- a matched filter;
- an FIR filter connected to the matched filter;
- a decision device connected to the FIR filter;
- a feedback filter connected to decision device;
- a controller connected to the matched filter, the FIR filter, and the feedback filter.
A digital equalizer that synchronizes with a synthesized signal having a peak constructed from energy from each significant ghost.
A digital equalizer having an FIR filter and a decision feedback filter, wherein the FIR filter is substantially longer than the decision feedback filter.
A digital equalizer comprising:
- a matched filter having a response equal to a channel response of a channel used to transmit a received signal;
- an FIR filter connected to the matched filter;
- a decision device connected to the FIR filter;
- a feedback filter that is substantially shorter than the FIR filter and that is connected to decision device;
- a controller connected to the matched filter, the FIR filter, and the feedback filter;
- wherein the channel response is determined using a test sequence contained in the transmitted signal;
- and
- wherein the equalizer synchronizes with a synthesized signal constructed by the composite function of the channel response of a channel used to transmit a received signal and itself.
Dependencies are inferred from the claim text.