公开(公告)号：US09941974B2

公开(公告)日：2018-04-10

申请号：US15387404

申请日：2016-12-21

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Yuanquan Wang ,  Xin Xiao

IPC: H04B10/00 ,  H04B10/61 ,  H04J14/06 ,  H04J14/00

CPC classification number: H04B10/612 ,  H04B10/613 ,  H04B10/6163 ,  H04B10/6166 ,  H04J14/06

Abstract: Techniques for receiving a modulated optical signal which has undergone a digital Fourier transform spreading (DFTS), include generating digital samples of the modulated optical signal, performing resampling and synchronization of the digital samples to generate time-corrected digital samples from an input wireless signal, compensating the time-corrected digital samples for nonlinearity (NL) to produce NL-compensated digital samples, de-spreading the NL-compensated digital samples using an inverse digital Fourier transform to recover quadrature amplitude modulation (QAM) modulated signals, applying post-equalization to the QAM signals to generate equalized QAM signals, performing a decision directed least mean square (DD-LMS) equalization to generate blind-optimized QAM signals and demodulating the blind-optimized QAM signals to recover data bits.

公开(公告)号：US10320489B2

公开(公告)日：2019-06-11

申请号：US15853449

申请日：2017-12-22

Applicant: ZTE Corporation

Inventor： Xin Xiao ,  Jianjun Yu

IPC: H04L27/06 ,  H04B10/69 ,  H04L25/02 ,  H04B10/079 ,  H04B10/11 ,  H04B10/548 ,  H04L27/38

Abstract: A channel estimation technique suitable for implementation at a digital communication receiver such as an optical signal receiver apparatus includes receiving, over a communication channel, a transmission comprising a sequence of modulated symbols, estimating, at multiple frequencies, estimated values of a channel transfer function of the communication channel and selectively revising the estimated values of channel transfer function by reducing glitches in the estimated values of the channel transfer function.

公开(公告)号：US20190052388A1

公开(公告)日：2019-02-14

申请号：US15676929

申请日：2017-08-14

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Jianyang Shi ,  Junwen Zhang ,  Xin Xiao

IPC: H04J14/02 ,  H04B10/2507 ,  H04B10/035 ,  H04B10/077 ,  H04B10/2513 ,  H04B10/2519 ,  H04B10/2525

Abstract: Methods and systems for optical signal transmission, particularly with carrier-less amplitude and phase (CAP) modulation and direct detection, are disclosed. In one exemplary aspect, a method of optical signal transmission is disclosed. The method includes receiving information bits at an input interface; mapping the information bits to a plurality of modulation symbols; separating in-phase (I) and quadrature (Q) components of the plurality of modulation symbols such that the I and Q components form a Hilbert pair in a resulting signal; pre-dispersing the resulting signal with an inverse of a phase delay of an expected chromatic dispersion to obtain a pre-dispersed signal; converting the pre-dispersed signal from digital domain to analog domain using a digital to analog conversion circuit; performing modulation of an output of the digital to analog conversion circuit to generate an output signal; and transmitting, over an optical transmission medium, the output signal from the modulation.

公开(公告)号：US20180183527A1

公开(公告)日：2018-06-28

申请号：US15853449

申请日：2017-12-22

Applicant: ZTE Corporation

Inventor： Xin Xiao ,  Jianjun Yu

IPC: H04B10/69 ,  H04L25/02

CPC classification number: H04B10/6972 ,  H04B10/0795 ,  H04B10/11 ,  H04B10/548 ,  H04L25/0204 ,  H04L27/3854

Abstract: A channel estimation technique suitable for implementation at a digital communication receiver such as an optical signal receiver apparatus includes receiving, over a communication channel, a transmission comprising a sequence of modulated symbols, estimating, at multiple frequencies, estimated values of a channel transfer function of the communication channel and selectively revising the estimated values of channel transfer function by reducing glitches in the estimated values of the channel transfer function.

公开(公告)号：US20170180055A1

公开(公告)日：2017-06-22

申请号：US15387404

申请日：2016-12-21

Applicant: ZTE Corporation

Inventor： Jianjun Yu ,  Yuanquan Wang ,  Xin Xiao

IPC: H04B10/61 ,  H04J14/06

CPC classification number: H04B10/612 ,  H04B10/613 ,  H04B10/6163 ,  H04B10/6166 ,  H04J14/06

Abstract: Techniques for receiving a modulated optical signal which has undergone a digital Fourier transform spreading (DFTS), include generating digital samples of the modulated optical signal, performing resampling and synchronization of the digital samples to generate time-corrected digital samples from an input wireless signal, compensating the time-corrected digital samples for nonlinearity (NL) to produce NL-compensated digital samples, de-spreading the NL-compensated digital samples using an inverse digital Fourier transform to recover quadrature amplitude modulation (QAM) modulated signals, applying post-equalization to the QAM signals to generate equalized QAM signals, performing a decision directed least mean square (DD-LMS) equalization to generate blind-optimized QAM signals and demodulating the blind-optimized QAM signals to recover data bits.