公开(公告)号：US20220070046A1

公开(公告)日：2022-03-03

申请号：US17410064

申请日：2021-08-24

Applicant: NEC Corporation

Inventor： Kiyohiko TAKAHASHI ,  Kaoru KISHIMOTO ,  Toshiki TAKEUCHI ,  Taichi OHTSUJI

IPC: H04L27/36 ,  H04L27/38 ,  H04L27/00 ,  G06N20/00

Abstract: A modulation format estimation device 100 includes: a frequency shift correction unit 112 configured to estimate the amount of a frequency shift using a baseband signal acquired from a received signal and correct the baseband signal based on an estimation result; a frequency error generation unit 122 configured to generate a plurality of frequency errors from a range set based on an error occurring in the estimation of the frequency shift amount; a frequency error introduction unit 123 configured to acquire learning baseband signals in which each of a plurality of source signals modulated by different modulation formats is frequency-shifted by each frequency error; and a modulation format estimation unit 113 configured to input a corrected baseband signal to a first machine learning model created by machine learning using learning data including the plurality of learning baseband signals and a label, and estimate a modulation format of the received signal.

公开(公告)号：US20160254786A1

公开(公告)日：2016-09-01

申请号：US15028556

申请日：2014-05-09

Applicant: NEC CORPORATION

Inventor： Kiyohiko TAKAHASHI

IPC: H03F1/02 ,  H03F3/217 ,  H03F3/19

CPC classification number: H03F1/0222 ,  H03F3/19 ,  H03F3/2173 ,  H03F3/2178 ,  H03F2200/171 ,  H03F2200/432 ,  H03F2200/462 ,  H03F2200/78

Abstract: A power supply circuit (10) includes: a linear amplifier (11) for generating a linear amplification signal based on an input signal; a first switching amplifier (12) for generating a first switching amplification signal of a first frequency band based on the linear amplification signal; a second switching amplifier (13) for generating a second switching amplification signal of a second frequency band based on the first switching amplification signal; and a power supply unit (14) for supplying a combined signal in which the linear amplification signal and the first and second switching amplification signals are combined to an external circuit as a power supply. It is therefore possible to improve the power efficiency.

Abstract translation: 电源电路（10）包括：线性放大器（11），用于基于输入信号产生线性放大信号; 第一开关放大器（12），用于基于线性放大信号产生第一频带的第一开关放大信号; 第二开关放大器（13），用于基于所述第一开关放大信号产生第二频带的第二开关放大信号; 以及电源单元（14），用于将线性放大信号和第一和第二开关放大信号组合的组合信号作为电源提供给外部电路。 因此，能够提高功率效率。