Title:
SIGNAL PROCESSING DEVICE AND SIGNAL PROCESSING METHOD
Document Type and Number:
WIPO Patent Application WO/2024/053059
Kind Code:
A1
Abstract:
One aspect of the present invention pertains to a signal processing device equipped with a number of filter processing units which corresponds to the number of spatial modes of a received optical signal, a total calculation unit for outputting the total of the output from the plurality of filter processing units, an IFFT processing unit for subjecting said total to an inverse Fourier transform, an output signal selection unit for outputting a signal containing only a pre-set prescribed portion of the output from the IFFT processing unit, an error signal output unit for outputting the difference between a desired signal and the output from the output signal selection unit as an error signal, and an FFT processing unit for subjecting the signal containing the error signal to a Fourier transform, wherein: the filter processing unit updates a filter weighting coefficient by using a signal obtained by multiplying only a pre-set prescribed portion of the output from the FFT processing unit and of a signal obtained by subjecting the received optical signal to processing which involves a Fourier transform by one another; and the filter processing unit outputs a signal obtained by multiplying only a pre-set prescribed portion of the filter weighting coefficient and of the received optical signal by one another.
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Inventors:
SHIBAHARA KOKI (JP)
KOBAYASHI TAKAYUKI (JP)
MIYAMOTO YUTAKA (JP)
KOBAYASHI TAKAYUKI (JP)
MIYAMOTO YUTAKA (JP)
Application Number:
PCT/JP2022/033759
Publication Date:
March 14, 2024
Filing Date:
September 08, 2022
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
International Classes:
H04B10/2581; H04B10/61
Domestic Patent References:
| WO2021044632A1 | 2021-03-11 | |||
| WO2018198891A1 | 2018-11-01 | |||
| WO2017211413A1 | 2017-12-14 | |||
| WO2015052895A1 | 2015-04-16 |
Other References:
LEE DOOHWAN; SHIBAHARA KOHKI; KOBAYASHI TAKAYUKI; MIZUNO TAKAYUKI; TAKARA HIDEHIKO; SANO AKIHIDE; KAWAKAMI HIROTO; NAKAGAWA TADAO;: "A Sparsity Managed Adaptive MIMO Equalization for Few-Mode Fiber Transmission With Various Differential Mode Delays", JOURNAL OF LIGHTWAVE TECHNOLOGY, IEEE, USA, vol. 34, no. 8, 15 April 2016 (2016-04-15), USA, pages 1754 - 1761, XP011609147, ISSN: 0733-8724, DOI: 10.1109/JLT.2015.2511178
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (JP)
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