公开(公告)号：US11082135B2

公开(公告)日：2021-08-03

申请号：US16230891

申请日：2018-12-21

Applicant: Huawei Technologies Co., Ltd.

Inventor： Michael Zarubinsky ,  Doron Cohen ,  Qingsong Xue ,  Dori Gidron ,  Ling Liu ,  Changsong Xie ,  Liangchuan Li ,  Ming Chen

IPC: H04B10/69 ,  H04L25/03 ,  H04B7/0413 ,  H04L27/26

Abstract: The present disclosure relates to an apparatus and method of processing a digital signal, wherein an input signal is transformed into the frequency domain by applying a fast Fourier transformation (FFT) processing to obtain a transformed input signal. Positive and negative frequency components of the transformed input signal are separated and respective ones of the separated positive and negative frequency components are separately processed by respective digital filtering to obtain filtered frequency components. The filtered frequency components are combined in the frequency domain using a down-sampling operation for down-sampling the filtered frequency components from an input number of samples per symbol to a different output number of samples per symbol, and the combined output components are converted into the time domain by applying an IFFT processing.

公开(公告)号：US10320478B2

公开(公告)日：2019-06-11

申请号：US14934964

申请日：2015-11-06

Applicant: Huawei Technologies Co., Ltd.

Inventor： Fabian Nikolaus Hauske ,  Changsong Xie

IPC: H04B10/077 ,  H04B10/61 ,  H04B10/50 ,  H04B10/516

Abstract: The present invention relates to an optical channel sounding transmitter apparatus, comprising an optical signal generator for generating an optical carrier signal; an optical modulator for modulating the optical carrier signal with a predetermined training sequence to obtain an modulated optical signal; a first optical transmitter for transmitting the optical carrier signal; and a second optical transmitter for transmitting the modulated optical signal. Further the present invention relates to a coherent optical channel sounding receiver apparatus, comprising a first optical receiver for receiving an optical carrier signal over a first optical channel; a second optical receiver for receiving a modulated optical signal over a second optical channel; an optical down converter for down converting the modulated optical signal using the received optical carrier signal to obtain a down converted signal; and a channel estimator for estimating a channel characteristic of the second optical channel.

公开(公告)号：US20190123834A1

公开(公告)日：2019-04-25

申请号：US16230891

申请日：2018-12-21

Applicant: Huawei Technologies Co., Ltd.

Inventor： Michael Zarubinsky ,  Doron Cohen ,  Qingsong Xue ,  Dori Gidron ,  Ling Liu ,  Changsong Xie ,  Liangchuan Li ,  Ming Chen

IPC: H04B10/69 ,  H04L25/03 ,  H04B7/0413 ,  H04L27/26

Abstract: The present disclosure relates to an apparatus and method of processing a digital signal, wherein an input signal is transformed into the frequency domain by applying a fast Fourier transformation (FFT) processing to obtain a transformed input signal. Positive and negative frequency components of the transformed input signal are separated and respective ones of the separated positive and negative frequency components are separately processed by respective digital filtering to obtain filtered frequency components. The filtered frequency components are combined in the frequency domain using a down-sampling operation for down-sampling the filtered frequency components from an input number of samples per symbol to a different output number of samples per symbol, and the combined output components are converted into the time domain by applying an IFFT processing.