System and methods for precursor cancellation of intersymbol interference in a receiver
First Claim
1. For use in a receiver capable of receiving from a transmission channel an incoming stream of known symbols and unknown symbols distorted by intersymbol interference (ISI), an apparatus for reducing a precursor ISI signal comprising:
- a decision feedback equalizer capable of receiving said incoming stream of distorted known symbols and distorted unknown symbols and generating a sequence of detected symbols; and
a known symbol generator capable of generating a copy of a first known symbol prior to an estimation of said first known symbol by said decision feedback equalizer, wherein said decision feedback equalizer uses said copy of said first known symbol to reduce a first precursor ISI signal in a second symbol transmitted prior to said first known symbol.
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Abstract
There is disclosed, for use in a receiver receiving from a transmission channel an incoming stream of known symbols and unknown symbols distorted by intersymbol interference (ISI), an apparatus for reducing a precursor ISI signal. The apparatus for reducing the precursor ISI signal comprises: 1) a decision feedback equalizer for receiving the incoming stream of distorted known symbols and distorted unknown symbols and generating a sequence of detected symbols; and 2) a known symbol generator for generating a copy of a first known symbol prior to an estimation of the first known symbol by the decision feedback equalizer, wherein the decision feedback equalizer uses the copy of the first known symbol to reduce a first precursor ISI signal in a second symbol transmitted prior to the first known symbol.
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Citations
23 Claims
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1. For use in a receiver capable of receiving from a transmission channel an incoming stream of known symbols and unknown symbols distorted by intersymbol interference (ISI), an apparatus for reducing a precursor ISI signal comprising:
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a decision feedback equalizer capable of receiving said incoming stream of distorted known symbols and distorted unknown symbols and generating a sequence of detected symbols; and
a known symbol generator capable of generating a copy of a first known symbol prior to an estimation of said first known symbol by said decision feedback equalizer, wherein said decision feedback equalizer uses said copy of said first known symbol to reduce a first precursor ISI signal in a second symbol transmitted prior to said first known symbol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A receiver capable of minimizing precursor intersymbol interference (ISI) in an incoming stream of known symbols and unknown symbols distorted by intersymbol interference (ISI) in a transmission channel, said receiver comprising:
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receiver front-end circuitry capable of receiving and amplifying an incoming modulated signal;
demodulation circuitry capable of receiving said amplified incoming modulated signal and producing therefrom a baseband signal comprising said incoming stream of distorted known symbols and distorted unknown symbols; and
an apparatus for reducing a precursor ISI signal comprising;
a decision feedback equalizer capable of receiving said incoming stream of distorted known symbols and distorted unknown symbols and generating a sequence of detected symbols; and
a known symbol generator capable of generating a copy of a first known symbol prior to an estimation of said first known symbol by said decision feedback equalizer, wherein said decision feedback equalizer uses said copy of said first known symbol to reduce a first precursor ISI signal in a second symbol transmitted prior to said first known symbol. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. For use in a receiver capable of receiving from a transmission channel an incoming stream of known symbols and unknown symbols distorted by intersymbol interference (ISI), a method of reducing a precursor ISI signal comprising the steps of:
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receiving the incoming stream of distorted known symbols and distorted unknown symbols;
generating a sequence of detected symbols in a decision feedback equalizer;
generating a copy of a first known symbol prior to an estimation of the first known symbol by the decision feedback equalizer; and
using the copy of the first known symbol to reduce a first precursor ISI signal in a second symbol transmitted prior to the first known symbol. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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Specification