Equalizer with perturbation effect based adaptation

An equalizer and adaptive technology, applied in baseband systems, baseband system components, shaping networks in transmitters/receivers, etc., and can solve problems such as frequent use

Active Publication Date: 2022-01-25
CREDO TECH GRP LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Many digital communication links use only one bit per symbol; a binary "0" is represented by one symbol (e.g., a voltage or current signal in a first range), and a

Method used

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  • Equalizer with perturbation effect based adaptation
  • Equalizer with perturbation effect based adaptation
  • Equalizer with perturbation effect based adaptation

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Embodiment Construction

[0017] Note that the specific embodiments given in the drawings and the following description do not limit the present disclosure. On the contrary, they provide a basis for those skilled in the art to discern alternatives, equivalents and modifications included within the scope of the claims.

[0018] The disclosed equalizers and equalization methods are best understood in the context of the larger environment in which they operate. Correspondingly, figure 1 An illustrative communications network is shown that includes mobile device 102 and computer systems 103-104 coupled via packet-switched routing network 106. Routing network 106 may be or include, for example, the Internet, a wide area network, or a local area network. exist figure 1 , routing network 106 includes a network of equipment items 108 such as hubs, switches, routers, bridges, and the like. Items of equipment 108 are connected to each other and to computer systems 103-104 via point-to-point communication lin...

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Abstract

Equalization methods and equalizers employing discrete-time filters are provided with dynamic perturbation effect based adaptation. Tap coefficient values may be individually perturbed during the equalization process and the effects on residual ISI monitored to estimate gradient components or rows of a difference matrix. The gradient or difference matrix components may be assembled and filtered to obtain components suitable for calculating tap coefficient updates with reduced adaptation noise. The dynamic perturbation effect based updates may be interpolated with pre-calculated perturbation effect based updates to enable faster convergence with better accommodation of analog component performance changes attributable to variations in process, supply voltage, and temperature.

Description

Background technique [0001] Digital communications occur between a sending device and a receiving device through an intermediate communications medium or "channel" (eg, fiber optic cable or insulated copper wire). Each transmitting device typically transmits symbols at a fixed symbol rate, while each receiving device detects the (possibly corrupted) symbol sequence and attempts to reconstruct the transmitted data. A "symbol" is a state or salient condition of a channel that persists for a fixed period of time, referred to as a "symbol interval". For example, a symbol may be a voltage or current level, an optical power level, a phase value, or a specific frequency or wavelength. A change from one channel state to another is called a symbol transition. Each symbol may represent (ie, encode) one or more binary bits of data. Alternatively, data may be represented by symbol switching, or by a sequence of two or more symbols. [0002] Many digital communication links use only on...

Claims

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Application Information

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IPC IPC(8): H04L25/03
CPCH04L25/03006H04L25/03885H04L25/03057H04L2025/0349H04L25/4919
Inventor 蔡昉孙俊清钱浩立
Owner CREDO TECH GRP LTD
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