US 12,231,173 B2
Symbol determination device and tap selection method
Hiroki Taniguchi, Musashino (JP); Masanori Nakamura, Musashino (JP); Shuto Yamamoto, Musashino (JP); and Yoshiaki Kisaka, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 18/021,869
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Aug. 24, 2020, PCT No. PCT/JP2020/031852
§ 371(c)(1), (2) Date Feb. 17, 2023,
PCT Pub. No. WO2022/044077, PCT Pub. Date Mar. 3, 2022.
Prior Publication US 2023/0361881 A1, Nov. 9, 2023
Int. Cl. H04B 10/60 (2013.01); H04B 10/516 (2013.01)
CPC H04B 10/60 (2013.01) [H04B 10/516 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A symbol determination device, comprising:
a candidate symbol sequence generator configured to generate a plurality of candidate symbol sequences that are candidates for a transmission symbol sequence;
a transmission line estimator configured to have a nonlinear filter including a plurality of taps and generate a plurality of estimated reception symbol sequences on the basis of an estimated transfer function of the transmission line represented by a tap gain value applied to each tap and the plurality of candidate symbol sequences;
a symbol determiner configured to determine the transmission symbol by maximum likelihood sequence estimation based on a determination target reception symbol sequence obtained from the reception signal sequence and each of the plurality of estimated reception symbol sequences, and identify the estimated transmission symbol corresponding to the determination target reception symbol sequence;
an update processor unit configured to calculate new tap gain values based on the determination target reception symbol sequence and the estimated transmission symbol sequence identified by the symbol determiner, and update the estimated transfer function by applying the calculated new tap gain values to the taps of the transmission line estimator; and
a tap selector configured to select the tap to be used on the basis of the magnitude of the new tap gain values calculated by the update processor and a predetermined tap gain threshold value.