Receiver and data receiving method

Patent metadata

Field	Value
Publication number	US-10630419-B2
Application number	US-201916398169-A
Country	US
Kind code	B2
Filing date	Apr 29, 2019
Priority date	Oct 31, 2016
Publication date	Apr 21, 2020
Grant date	Apr 21, 2020

Abstract

Embodiments of the present invention provide a receiver and a data receiving method. The receiver includes: two first input ends, configured to receive a digital signal of an X-polarization state and a digital signal of a Y-polarization state; a despreading module, configured to despread the digital signal of the X-polarization state and the digital signal of the Y-polarization state based on N delay values and spreading codes of N transmitters, to obtain N first baseband signals and N second baseband signals; and a multiple-input multiple-output equalization module, configured to perform equalization filtering processing on the N first baseband signals and the N second baseband signals, to obtain recovered data of the first polarization states and recovered data of the second polarization states of the N transmitters. In the embodiments of the present invention, the coherent CDMA multipoint-to-point data transmission in an optical communications system is implemented.

First claim

What is claimed is:

1. A receiver, comprising:
two first input ends;
a despreading module;
a multiple-input multiple-output equalization module; and
2N first output ends;
wherein the two first input ends are connected to the despreading module, and
are configured to respectively receive a digital signal of an X-polarization state and a digital signal of a Y-polarization state;
wherein the despreading module is connected to the multiple-input multiple-output equalization module, and is configured to despread the digital signal of the X-polarization state and the digital signal of the Y-polarization state based on N delay values and spreading codes of N transmitters, to obtain N first baseband signals and N second baseband signals;
wherein each of the N first baseband signal comprises a first baseband signal of the X-polarization state and a first baseband signal of the Y-polarization state;
wherein each of the N second baseband signal comprises a second baseband signal of the X-polarization state and a second baseband signal of the Y-polarization state;
wherein the N delay values are respectively determined based on differences between synchronization positions of first polarization states and synchronization positions of second polarization states of the N transmitters;
wherein the multiple-input multiple-output equalization module is configured to perform equalization filtering processing on the N first baseband signals and the N second baseband signals, to obtain recovered data of the first polarization states and recovered data of the second polarization states of the N transmitters; and
wherein the 2N first output ends each are configured to output recovered data of one polarization state of one transmitter, N being a positive integer greater than or equal to 1.

2. The receiver according to claim 1 , wherein the despreading module comprises a first despreading module and a second despreading module, and wherein the first despreading module and the second despreading module each comprise two input ends and 2N output ends;
wherein the two input ends of the first despreading module and the two input ends of the second despreading module are separately connected to the two first input ends;
wherein the 2N output ends of the first despreading module and the 2N output ends of the second despreading module are separately connected to one second output end;
wherein the first despreading module is configured to output the N first baseband signals, and the second despreading module is configured to output the N second baseband signals; and
wherein one output end of the first despreading module is configured to output a first baseband signal of the X-polarization state of one transmitter or a first baseband signal of the Y-polarization state of one transmitter, and one output end of the second despreading module is configured to output a second baseband signal of the X-polarization state of one transmitter or a second baseband signal of the Y-polarization state of one transmitter.

3. The receiver according to claim 2 , wherein the despreading module further comprises a first polarization state synchronization module and a second polarization state synchronization module;
wherein the first polarization state synchronization module is configured to determine the synchronization positions of the first polarization states of the N transmitters based on training sequences of the first polarization states of the N transmitters, the digital signal of the X-polarization state, and the digital signal of the Y-polarization state; and
wherein the second polarization state synchronization module is configured to determine the synchronization positions of the second polarization states of the N transmitters based on training sequences of the second polarization states of the N transmitters, the digital signal of the X-polarization state, and the digital signal of the Y-polarization state.

4. The receiver according to claim 3 , wherein the despreading module further comprises an adjustable delay module, wherein the adjustable delay module is disposed between the two first input ends and the first despreading module, and wherein the adjustable delay module is further connected to the first polarization state synchronization module and the second polarization state synchronization module;
wherein the adjustable delay module is configured to: determine delay values of the N transmitters based on the differences between the synchronization positions of the first polarization states of the N transmitters and the synchronization positions of the second polarization states of the N transmitters, perform delay processing on the digital signal of the X-polarization state and the digital signal of the Y-polarization state separately based on the delay values of the N transmitters to obtain N delayed digital signals of the X-polarization state and N delayed digital signals of the Y-polarization state, and output the N delayed digital signals of the X-polarization state and the N delayed digital signals of the Y-polarization state to the first despreading module; and
wherein the first despreading module separately despreads the N delayed digital signals of the X-polarization state and the N delayed digital signals of the Y-polarization state by using the spreading codes of the N transmitters, to obtain the N first baseband signals.

5. The receiver according to claim 3 , wherein the despreading module further comprises an adjustable delay module, wherein the adjustable delay module is disposed between the two first input ends and the second despreading module, and wherein the adjustable delay module is further connected to the first polarization state synchronization module and the second polarization state synchronization module;
wherein the adjustable delay module is configured to: determine delay values of the N transmitters based on the differences between the synchronization positions of the first polarization states of the N transmitters and the synchronization positions of the second polarization states of the N transmitters, respectively perform delay processing on the digital signal of the X-polarization state and the digital signal of the Y-polarization state based on the delay values of the N transmitters to obtain N delayed digital signals of the X-polarization state and N delayed digital signals of the Y-polarization state, and output the N delayed digital signals of the X-polarization state and the N delayed digital signals of the Y-polarization state to the second despreading module; and
wherein the second despreading module respectively despreads the N delayed digital signals of the X-polarization state and the N delayed digital signals of the Y-polarization state by using the spreading codes of the N transmitters, to obtain the N second baseband signals.

6. The receiver according to claim 3 , wherein the despreading module further comprises N adjustable delay modules, wherein the first despreading module comprises N first despreading submodules, wherein the N adjustable delay modules each are disposed in one first despreading submodule, and wherein one of the first N despreading submodule is configured to output a first baseband signal of the X-polarization state and a first baseband signal of the Y-polarization state of one transmitter;
wherein each of the N adjustable delay module determines a delay value of one transmitter based on a difference between a synchronization position of a first polarization state of the transmitter and a synchronization position of a second polarization state of the transmitter, performs delay processing on a spreading code of the transmitter based on the delay value of the transmitter to obtain a delayed spreading code of the transmitter, and outputs the delayed spre

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Xie
• Huang Yuanda
• Li Liangchuan

Classifications

• H04B10/2569

  due to polarisation mode dispersion [PMD] · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04J14/0238

  Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths · CPC title

• H04J14/005 Primary

  Optical Code Multiplex · CPC title

• H04B7/10

  Polarisation diversity; Directional diversity · CPC title