Efficient calculation of initial equaliser coefficients

A technology of initial coefficients and equalizers, applied in baseband systems, transmission systems, digital transmission systems, etc., can solve problems such as complex delay taps, complex equations, and inability to solve them

Active Publication Date: 2014-10-01
IMAGINATION TECH LTD
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Problems solved by technology

An example method of obtaining equalizer coefficients is to use the Wienerhoff equation, however, the large number of delay taps used to solve this equation is too complex, and in fact, in some cases, the equation is too complex to solve

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  • Efficient calculation of initial equaliser coefficients
  • Efficient calculation of initial equaliser coefficients
  • Efficient calculation of initial equaliser coefficients

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Embodiment Construction

[0030] Embodiments of the present invention will be described below by way of example only. These examples represent the best mode currently known to the applicant to put the invention into practice, however they are not the only ways in which the invention could be obtained. This specification sets forth the function of the described example and the sequence of steps used to build and operate the described example. However, the same or equivalent functions and sequences can be accomplished by different examples.

[0031] As mentioned above, in practice, using the Wiener-Hoff equation to calculate the equalizer coefficients is too complicated in the case of combined FFE and DFE. An alternative method is described below that substantially reduces the processing effort. figure 1 The method shown in , consists of two stages 10, 11: First, a channel matched filter (which can also be referred to as a "matched filter") is designed and applied to an initial channel estimate (conve...

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Abstract

Methods of efficient calculation of initial equaliser coefficients are described. In a first stage, a channel matched filter is generated based on an estimate of CIR and then used to filter the CIR estimate. In a second stage, initial FFE coefficients are calculated from a portion of the match filtered CIR and then these initial FFE coefficients and the estimate of CIR may be used to generate initial DFE coefficients. In various embodiments, a window is applied to the CIR estimate before the matched filter is generated. In various embodiments, the second stage is iterated to minimise the pre-echoes following the FFE.

Description

Background technique [0001] Digital terrestrial television signals are subject to multipath interference which results in pre-echo caused by signals received via shorter paths than the path traveled by the main signal and by signals having traveled longer paths. Post-echo. Therefore, digital television receivers include circuitry including adaptive equalizers to suppress these echoes. [0002] A common equalization method for these signals is to use a combination of a feed-forward equalizer (FFE) and a decision-feedback equalizer (DFE). These two different types of equalizers have different characteristics and can be used to deal with different aspects of interference. FFE can handle preamble and postamble Intersymbol Interference (ISI), eg, preecho and postecho, while DFE can only handle preamble ISI, but, unlike FFE, DFE does not enhance noise. [0003] In order to use a combination of FFE and DFE, equalizer coefficients must be specified, while these equalizer coefficien...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L25/02
CPCH04L2025/03611H04L25/03159H04L2025/03656H04L25/0212
Inventor 山形拓
Owner IMAGINATION TECH LTD
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