Decision feedback equalization with precursor inter-symbol interference reduction

A decision feedback equalization and decision technology, applied in equalizers, shaping networks in transmitters/receivers, digital transmission systems, etc., can solve problems such as preamble ISI amplification noise and crosstalk

Active Publication Date: 2018-02-16
XILINX INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, FFE may amplify noise and / or crosstalk during this leading ISI reduction

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  • Decision feedback equalization with precursor inter-symbol interference reduction
  • Decision feedback equalization with precursor inter-symbol interference reduction
  • Decision feedback equalization with precursor inter-symbol interference reduction

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Embodiment Construction

[0033] In the following description, numerous specific details are set forth in order to provide a thorough description of certain embodiments described herein. It will be apparent, however, to one skilled in the art that one or more other embodiments and / or variations of these embodiments may be practiced without the specific details described below. In other instances, well-known features have not been described in order to avoid obscuring the description of the embodiments herein. For ease of illustration, the same numerals are used in different figures to denote the same content; however, in other embodiments, these content may be different.

[0034] Before describing the embodiments illustrated in the figures, an overview is provided to aid further understanding.

[0035] FFE preamble ISI reduction has limitations related to noise and / or crosstalk amplification. As described in additional detail below, leading ISI reduction can be used in DFE to provide enhanced DFE. T...

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Abstract

In a receiver (100), a decision feedback equalizer provides weighted postcursor decisions to a subtraction block for subtraction from an analog input signal (101) to provide an analog output signal (123). A postcursor decision block compares the analog output signal against positive and negative values (104, 105) of a postcursor coefficient for providing first and second possible decisions (136, 137) for selecting a current postcursor-based decision (116) therebetween responsive to a previous postcursor-based decision (117). A precursor cancellation block (108) receives the analog output signal, the previous postcursor-based decision and the current postcursor-based decision for providing a digital output signal (124) for a previous sample of the analog input signal. The precursor cancellation block includes comparators (211-214) for receiving the analog output signal and for respectively receiving threshold inputs (201-204) different from one another for providing possible digital outputs (215-218) for the analog output signal. The selection stage (230) is coupled for receiving the possible digital outputs (215-218) for selection of the digital output signal.

Description

technical field [0001] The following description refers to integrated circuit devices ("ICs"). More particularly, the following description relates to decision feedback equalization with pre-cursor inter-symbol interference reduction for use in IC. Background technique [0002] In discrete systems, the receiver can use an equalizer to clean up the signal for data decisions. For example, in a serial deserialization ("SerDes") receiver, continuous time linear equalization ("CLTE"), feed-forward equalization ("FFE"), and decision feedback equalization (decision feedback equalization, "DFE") can be used. CTLE and DFE reduce interference primarily by canceling trailing inter-symbol interference ("ISI") in modulated data transmissions received by such receivers. FFE is used to reduce interference by eliminating leading ISI. However, FFE may amplify noise and / or crosstalk during this leading ISI reduction. Accordingly, it would be desirable to be able to provide an IC that ove...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): H04L25/03
CPCH04L25/03146H04L25/03878H04L2025/03503H04L2025/0349H04L25/03057H04L25/03885H04L27/10H04L27/01H04L25/03
Inventor廖宇张洪涛张琨永G·张
OwnerXILINX INC