Equalizer circuit, data transmission system and equalization method

A technology of equalization circuit and equalization method, which is applied in the field of communication, and can solve the problems of inaccurate DFE output, equalizer output signal rk error, and error transmission, etc.

Active Publication Date: 2013-01-16
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, when the decision device makes a hard decision, if there is an error in the hard decision, the erroneous decision result dk output by the decision device will be kept in the delay regis

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  • Equalizer circuit, data transmission system and equalization method
  • Equalizer circuit, data transmission system and equalization method
  • Equalizer circuit, data transmission system and equalization method

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Embodiment Construction

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0035] Aiming at the error transfer phenomenon existing in the above equalization circuit, feedback equalization and trellis coded modulation (Trellis Coded Modulation, TCM) decoding can be combined to avoid this phenomenon. Specifically, feedback equalization can be used to eliminate a part of backward intersymbol interference, for example, only the second level and subsequent backward intersymbol interference can be eliminated, while the first level b...

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Abstract

The invention provides an equalizer circuit, a data transmission system and an equalization method. The equalizer circuit comprises a first adder, a decoder and a decision feedback equalizer, wherein the first adder receives a feedback signal and first input data which are output by a feed forward equalizer circuit, and is used for adding the first input data and the feedback signal to acquire an equalization output result; the decoder receives the equalization output result, and is used for decoding the equalization output result to acquire a decoding result; and the decision feedback equalizer receives the decoding result, and is used for filtering the decoding result on the basis of a first filter coefficient to acquire the feedback signal and outputs the feedback signal to the first adder, so that time-lag inter-symbol interference is eliminated. By the circuit, the system and the method, the decision feedback equalizer for filtering the output of a decision device to eliminate the inter-symbol interference is eliminated, so that error propagation can be avoided in the decision feedback equalizer.

Description

[0001] The invention relates to the communication field, in particular to an equalizing circuit, a data transmission system and an equalizing method. Background technique [0002] Gigabit Ethernet Physical Layer (GEPHY) is the electrical Ethernet physical layer. In the following, GEPHY specifically refers to the physical layer subsystem (module) implemented in the electrical port Ethernet communication chip, and the communication between the two parties is completed on the five or super five types of unshielded twisted pair (Unshielded Twisted Pair, UTP), and Need to support 1000BASE-T / 100BASE-TX / 10BASE-T protocol. In this article, especially the communication under the 1000BASE-T protocol standard is involved. [0003] According to the requirements of the IEEE specification, the 1000Base-T system transmits 4D-PAM5 signals at a modulation rate of 125MBaud on 4 pairs of unshielded twisted pairs, which can achieve 1Gb / s full-duplex data transmission. While the 4D-PAM5 signal i...

Claims

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Application Information

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IPC IPC(8): H04L25/03
Inventor 俞波曹炜魏茂林
Owner HUAWEI TECH CO LTD
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