Adaptive equalizer, step size derivation method and program
AssigneeNTT, Inc.
InventorsKengo Horikoshi, Seiji Okamoto, Masanori Nakamura
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Abstract
An adaptive equalizer includes an updating unit that updates a step size of a vector of a tap coefficient used for controlling an adaptive filter based on a time-series update vector in accordance with a time-series input and output of the adaptive filter that tracks a polarization state of an optical signal received by a coherent optical receiver. The updating unit updates the step size based on a DC gain of the update vector. The updating unit may update the step size for each update vector component based on a DC gain for each update vector component.
Claims5
An adaptive equalizer comprising:
- a processor;
- and
- a storage medium having computer program instructions stored thereon, wherein the computer program instructions, when executed by the processor, perform processing of:
- updating a step size of a vector of a tap coefficient used for controlling an adaptive filter based on a time-series update vector in accordance with a time-series input and output of the adaptive filter that tracks a polarization state of an optical signal received by a coherent optical receiver,
- wherein the computer program instructions further perform processing of updating the step size based on a DC gain of the update vector.
A step size derivation method executed by an adaptive equalizer, the method comprising the step of:
- updating a step size of a vector of a tap coefficient used for controlling an adaptive filter based on a time-series update vector in accordance with a time-series input and output of the adaptive filter that tracks a polarization state of an optical signal received by a coherent optical receiver,
- wherein the step of updating includes updating the step size based on a DC gain of the update vector.
Dependencies are inferred from the claim text.