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Title:
SYMBOL-DETERMINING DEVICE AND SYMBOL DETERMINATION METHOD
Document Type and Number:
WIPO Patent Application WO/2019/142912
Kind Code:
A1
Abstract:
A symbol-determining device of an embodiment is provided with: a transmission-line-shortening unit for multiplying the tap gain of a linear digital filter for each symbol value in some of symbol sequences of an input signal and outputting a symbol sequence that indicates the sum of each multiplied value; a transmission line estimation unit for estimating, using an adaptive nonlinear digital filter, the transfer function of a transmission line on the basis of a symbol sequence that indicates the state of the transmission line; an addition-comparison processing unit for calculating the minimum value of a distance function in a Viterbi algorithm on the basis of metrics calculated on the basis of the output of the transmission-line-shortening unit and the transfer function; and a path backtracing determination unit for tracing back the path of trellis in the Viterbi algorithm on the basis of the minimum value of the distance function and thereby making symbol determination.

Inventors:
TANIGUCHI Hiroki (9-11 Midori-cho 3-chome, Musashino-sh, Tokyo 85, 〒1808585, JP)
YAMAMOTO Shuto (9-11 Midori-cho 3-chome, Musashino-sh, Tokyo 85, 〒1808585, JP)
MASUDA Akira (9-11 Midori-cho 3-chome, Musashino-sh, Tokyo 85, 〒1808585, JP)
FUKUTOKU Mitsunori (9-11 Midori-cho 3-chome, Musashino-sh, Tokyo 85, 〒1808585, JP)
Application Number:
JP2019/001474
Publication Date:
July 25, 2019
Filing Date:
January 18, 2019
Export Citation:
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Assignee:
NIPPON TELEGRAPH AND TELEPHONE CORPORATION (5-1 Otemachi 1-chome, Chiyoda-ku Tokyo, 16, 〒1008116, JP)
International Classes:
H04B10/2507; H03M13/41; H04B3/06; H04B10/69; H04L25/03
Domestic Patent References:
WO1995012926A11995-05-11
Foreign References:
JPH10173573A1998-06-26
JPH04351136A1992-12-04
Other References:
KAWAHARA, HIROKI ET AL.: "A Proposal of Interchannel Nonlinear Compensation Method by the Collaboration of Optical Compensation and the Adaptive Volterra Filter", PROCEEDINGS OF THE IEICE GENERAL CONFERENCE, March 2016 (2016-03-01), pages 357
SJOERD VAN DER HEIDE: "Experimental Investigation of Impulse Response Shortening for Low-Complexity MLSE of a 112-Gbit/s PAM-4 Transceiver", IEEE 42ND EUROPEAN CONFERENCE AND EXHIBITION ON OPTICAL COMMUNICATION, ECOC 2016, September 2016 (2016-09-01), pages 115 - 117, XP055628552
TANIGUCHI, HIROKI ET AL.: "Improvement in proof stress of bandwidth limitation by nonlinear maximum- likelihood sequence estimation in short-haul optical transmission", PROCEEDINGS OF THE IEICE GENERAL CONFERENCE, March 2018 (2018-03-01), pages 222
Attorney, Agent or Firm:
SHIGA INTERNATIONAL PATENT OFFICE (1-9-2, Marunouchi Chiyoda-k, Tokyo 20, 〒1006620, JP)
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