Method of equalising a channel and apparatus therefor
First Claim
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1. A method of equalising a channel by adapting tap coefficients of a filter, the method comprising the steps of:
- setting the tap coefficients to a seed solution, the seed solution being a minimum iteration distance from a set of plausible solutions;
making a heuristic change to the tap coefficients; and
measuring a link quality associated with an output signal resulting from the heuristic change to the tap coefficients.
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Abstract
In the field of optical communications, a number of techniques are known for channel equalisation. However, these techniques are, for various different technical and/or economic reasons, unsuitable for application in relation to optical communications at a data rate of 10 Gbps. Consequently, the present invention provides a dithered linear search algorithm adapted to change tap weights (45, 75) of a filter (15) in accordance with a heuristic tap modification scheme.
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Citations
26 Claims
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1. A method of equalising a channel by adapting tap coefficients of a filter, the method comprising the steps of:
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setting the tap coefficients to a seed solution, the seed solution being a minimum iteration distance from a set of plausible solutions;
making a heuristic change to the tap coefficients; and
measuring a link quality associated with an output signal resulting from the heuristic change to the tap coefficients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An apparatus for equalising a communications channel, the apparatus comprising:
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a filter for receiving a bit stream, the filter comprising taps; and
a processing resource arranged to set, when in use, coefficients of the taps to a seed solution, the seed solution being a minimum iteration distance from a set of plausible solutions, and make a heuristic change to the tap coefficients of the filter;
wherein the processing resource is further arranged to measure, when in use, a link quality associated with an output signal resulting from the heuristic change to the tap coefficients.
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23. An adaptive equaliser apparatus comprising the apparatus for equalising a communications channel as claimed in claim 22.
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24. An optical receiver comprising the apparatus for equalising a communications channel as claimed in claim 22.
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25. A method of equalising a channel substantially as hereinbefore described with reference to accompanying FIGS. 2 to 17.
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26. An apparatus for equalising a communications channel substantially as hereinbefore described with reference to accompanying FIGS. 1 to 17.
Specification