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Effective adaptive filtering techniques

An equalizer and performance technology, applied in digital transmission systems, adaptive networks, baseband systems, etc., can solve problems such as non-existence

Inactive Publication Date: 2012-05-23
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Effective adaptive filtering techniques
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Embodiment Construction

[0016] Embodiments may generally relate to efficient adaptive filtering techniques. In one embodiment, for example, the noise calculation module determines the noise level of the input signal. Based on the noise level, the boundary setting module sets simplified constellation boundary intervals. This simplified constellation boundary spacing is used by an equalizer (adaptive filter) to perform adaptive equalization on the input signal. Thereby, the performance of the equalizer is enhanced at higher noise levels (ie low signal-to-noise ratio). Other embodiments may be described and claimed.

[0017] Various embodiments may include one or more elements. An element may comprise any structure arranged to perform some operation. Each element may be implemented as hardware, software or any combination thereof as desired for a given set of design parameters or performance constraints. Although an embodiment may be described using a limited number of elements in a particular topo...

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Abstract

A noise level of an input signal is determined by a noise calculation module. based on the noise level, a boundary setting module sets a reduced constellation boundary interval. This reduced constellation boundary interval is employed by an equalizer to perform adaptive equalization of the input signal.

Description

technical field [0001] The present invention relates generally to efficient adaptive filtering techniques, and more particularly to apparatus, methods and apparatus for providing enhanced equalizer performance. Background technique [0002] A decision feedback equalizer may be employed in the device to correct for signal multipath and / or intersymbol interference (ISI) of the received signal. However, in a noisy environment, the equalizer can make wrong decisions when estimating the transmitted signal. Such decisions can lead to incorrect symbol feedback within the equalizer and incorrect adaptation of the equalizer filter coefficients. As a result, unstable equalizer performance may be caused. [0003] Currently, there is a lack of dedicated techniques or algorithms designed to address this deleterious effect. Certain equalizers may employ simplified constellation boundaries. It is also conceivable to suspend the adaptation of the equalizer filter coefficients when the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03H21/00
CPCH03H2021/0056H04L2025/03356H04L2025/03694H04L25/0307H04L2025/03566
Inventor A·塞德E·纽默G·格斯林
Owner INTEL CORP