公开(公告)号：US20150311983A1

公开(公告)日：2015-10-29

申请号：US14651037

申请日：2013-12-11

Applicant: NEC CORPORATION

Inventor： Kohei HOSOKAWA ,  Yuichi NAKAMURA

IPC: H04B10/61

CPC classification number: H04B10/6164

Abstract: A frequency offset compensation apparatus includes: first FFT means for performing a discrete-time Fourier transform of an input signal; second FFT means for performing a discrete-time Fourier transform; and offset compensation means for changing an order of output data of the first FFT means according to a frequency offset compensation amount, and rearranging the output data, and then inputting the output data to the second FFT means. This makes possible a frequency offset compensation without needing a new complex multiplier or a new memory in optical communication.

Abstract translation: 频偏补偿装置包括：第一FFT装置，用于执行输入信号的离散时间傅里叶变换; 用于执行离散时间傅里叶变换的第二FFT装置; 以及偏移补偿装置，用于根据频率偏移补偿量改变第一FFT装置的输出数据的顺序，并重新排列输出数据，然后将输出数据输入到第二FFT装置。 这使得可以进行频偏补偿而不需要新的复数乘法器或光通信中的新存储器。

公开(公告)号：US20170308635A1

公开(公告)日：2017-10-26

申请号：US15520781

申请日：2015-10-20

Applicant: NEC Corporation

Inventor： Manabu KUSUMOTO ,  Yuichi NAKAMURA ,  Takahiro KUMURA

IPC: G06F17/50 ,  G06F17/13

CPC classification number: G06F17/5036 ,  G06F17/13 ,  G06F17/50 ,  G06F17/5009 ,  G06F17/509 ,  G06F2217/16 ,  G06F2217/34 ,  G06F2217/36

Abstract: An apparatus, method and the like which enables to represent a pipe network transporting a fluid by use of electrical circuit network is provided. The pipe network analysis apparatus includes; processing circuitry configured to receive a pipe network model that represents a pipe network being constituted by one or more piping elements, convert at least one piping element to an element of an electric circuit being configured to represent a non-linear relation between a pressure and a flow rate of the fluid in the piping elements by use of a relation between a voltage and a current, and generate a model representing an electric circuit network expressing the pipe network, by use of the element of the electric circuit; and an output device configured to provide the model analyzable by a specific electric circuit simulator.