WO2020001651A1

WO2020001651A1 - Data recovering method and apparatus

Info

Publication number: WO2020001651A1
Application number: PCT/CN2019/093888
Authority: WO
Inventors: 乐燕思; 周谞; 冯志勇
Original assignee: 华为技术有限公司
Priority date: 2018-06-30
Filing date: 2019-06-28
Publication date: 2020-01-02
Also published as: CN110661578B; CN110661578A

Abstract

A data restoring method and apparatus, for resolving the problem of how to perform stable and accurate data recovery on any polarization signal received by a simple coherent optical receiver. The method comprises: receiving a polarization insensitive signal, performing frame synchronization on the polarization insensitive signal, and determine a frame start position; extracting synchronization header overhead and DSP overhead according to the frame start position and a frame structure; performing frequency offset compensation on a data portion in the polarization insensitive signal according to the DSP overhead; performing carrier phase compensation on the synchronization header overhead according to the synchronization header overhead of a first reference sequence and determining an initial MIMO coefficient according to the synchronization header overhead after carrier phase compensation; next, determining an initial phase; determining updated MIMO coefficient and updated phase according to the initial MIMO coefficient and the initial phase; and performing carrier phase compensation and polarization de-multiplexing according to the updated MIMO coefficient and the updated phase.

Description

Data recovery method and device

This application claims priority from a Chinese patent application filed with the Chinese Patent Office on June 30, 2018, with an application number of 201810716438.8, and an application name of "a data recovery method and device", the entire contents of which are incorporated herein by reference .

Technical field

The present application relates to the field of optical communication technologies, and in particular, to a data recovery method and device.

Background technique

With the rise of mobile Internet and high-definition video services, the traffic of metropolitan area networks has grown exponentially, and low latency and high bandwidth have gradually become the requirements of next-generation metro optical networks. Due to the increasing bandwidth requirements of metropolitan area network services and the characteristics of low convergence ratio of services, the network needs to establish an end-to-end connection for the service, that is, an end-to-end channel is established directly at the optical layer for the specific service through the optical wavelength, so that the The service obtains the lowest transmission delay and can make the network architecture more flat. In order to achieve this purpose, a coherent communication system was initially used to implement the selection of the wavelength channel. The coherent communication system uses a traditional coherent receiver, including a 90 ° optical mixer and a polarized beam splitter. The structure is complex, expensive, and consumes high power. , Users are difficult to accept. For this reason, a minimalist coherent communication system is proposed, which does not require a 90 ° optical hybrid and a polarized beam splitter (PBS), and only requires a coupler to achieve coherent reception. Compared with the traditional coherent optical receiver, the minimalist coherent optical receiver reduces the production cost and difficulty, and has a great cost advantage. However, the signals received by the minimalist coherent optical receiver include signals of two arbitrary polarization states (polarization insensitivity), X and Y, and data recovery cannot be achieved using traditional DSP algorithms.

In order to recover polarization-insensitive signal data, two solutions have been proposed in the prior art. The first solution is a digital signal processing (DSP) algorithm that implements data recovery in the frequency domain. Specifically, in the signal spectrum two Side-inserted probes achieve frequency offset compensation (FOC) and phase recovery. However, this solution requires accurate filtering of the probe. If the initial frequency offset is large, the probe may be lost and data recovery may fail. When there is an error in the frequency offset compensation, the phase recovery performance is poor, so the system is stable. There is no guarantee. Solution 2: Cascade LMS algorithm. Specifically, phase recovery, polarization demultiplexing, and dispersion compensation can be implemented in the time domain. However, there is no frame synchronization and frequency offset compensation module in this solution, so it is still impossible to achieve data recovery in the time domain.

In summary, in a minimalist coherent communication system, the traditional coherent receiving DSP algorithm cannot solve the problems of frequency offset compensation and phase recovery in the time domain, so data recovery cannot be achieved. How to receive a minimalist coherent optical receiver The stable and accurate data recovery of arbitrary polarization signals is a problem that needs to be solved at present.

Summary of the invention

The present application provides a data recovery method and device for solving the problem of how to perform stable and accurate data recovery on an arbitrary polarization state signal received by a minimalist coherent optical receiver in the prior art.

In a first aspect, the present application provides a data recovery method including: receiving a polarization insensitive signal, performing frame synchronization on the one polarization insensitive signal, and determining a frame start position; and according to the one polarization insensitive signal Frame start position and frame structure, extract the synchronization header overhead and DSP overhead in the one polarization insensitive signal; perform frequency offset compensation for the data portion in the one polarization insensitive signal according to the DSP overhead; A reference sequence synchronization header overhead, carrier phase compensation is performed on the synchronization header overhead, and an initial MIMO coefficient is determined according to the synchronization head overhead after the carrier phase compensation; an initial phase is determined according to the initial MIMO coefficient; and an initial MIMO is determined according to the initial MIMO coefficient. The coefficient and the initial phase, determine the updated MIMO coefficient and the updated phase; and perform a data portion of the one polarization-insensitive signal after frequency offset compensation according to the updated MIMO coefficient and the updated phase Carrier phase compensation and polarization demultiplexing.

Through the above method, a minimalist coherent optical receiver can determine the synchronization head overhead and DSP overhead in a received polarization-insensitive signal, and perform frequency offset compensation on the data portion of the polarization-insensitive signal according to the DSP overhead. Sync header overhead Carrier phase compensation is performed on the synchronization header overhead of the polarization-insensitive signal. The MIMO coefficient is determined by an algorithm, and the updated MIMO coefficient and the updated phase are further determined. The updated MIMO coefficient is used. And the updated phase performs carrier phase compensation and polarization demultiplexing on the data portion of a polarization-insensitive signal, that is, the received arbitrary polarization signal is stably and accurately restored.

In a possible design, the one polarization insensitive signal includes a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal have a special frame structure, so In the special frame structure, a synchronization header overhead is inserted at a setting position of a frame header of the first polarization state signal and the second polarization state signal, and a DSP overhead is inserted at a setting position of a data frame.

With this method, based on a special frame structure, data recovery is performed on a received polarization-insensitive signal, which can improve the accuracy of data recovery.

In a possible design, the synchronization header overhead is a frame inserted with a first set frame length at a frame header interval between the first polarization state signal and the second polarization state signal; and the DSP overhead is A frame of a third set frame length that is inserted every second set frame length in a data frame of the first polarization state signal and the second polarization state signal.

With this method, the synchronization head overhead of the polarization state of the first polarization state signal and the synchronization head overhead of the second polarization state are spaced, so that at the same time, there is only one group of polarization insensitive signals during data transmission. The data is the same when the DSP overhead is inserted and when the synchronization header overhead is inserted.

In a possible design, the first reference sequence is a reference sequence corresponding to a polarized signal with a larger power in a synchronization head overhead of the first polarization state signal and a synchronization head overhead of the second polarization state signal.

By this method, selecting the reference sequences with a high power consumption among the reference sequence of the first polarization state signal and the reference sequence of the second polarization state signal can improve the accuracy of subsequent processing.

In a possible design, performing frame synchronization on the one polarization-insensitive signal to determine a frame start position includes: calculating a synchronization header overhead of a first set frame length and a first reference sequence. Correlation of synchronization header overhead to determine frame start position.

In a possible design, performing frequency offset compensation on the data portion of the one polarization-insensitive signal according to the DSP overhead includes determining a frequency offset between the DSP overhead and the DSP overhead of the first reference sequence. , Performing frequency offset compensation on a data portion of the one polarization insensitive signal according to the offset.

In a possible design, determining the initial MIMO coefficient according to the synchronization header overhead after carrier phase compensation includes: calculating the synchronization header overhead after carrier phase compensation through the LMS algorithm to determine the initial MIMO coefficient.

By this method, a rough estimation of the initial MIMO coefficient can accelerate the convergence speed of the cascaded LMS error curve and improve the system performance.

In a possible design, the initial phase C may be derived based on the following formula: the initial MIMO coefficient * the data portion * 1 ^c = a preset reference sequence.

In a possible design, determining the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase includes: determining according to the initial MIMO coefficient, the initial phase, and an LMS algorithm. Updated MIMO coefficient and updated phase.

In a second aspect, the present application provides a device including an acquisition unit and a processing unit. The acquisition unit is configured to receive a polarization insensitive signal, and the processing unit is configured to perform frame synchronization on the one polarization insensitive signal to determine a frame. Starting position; according to the frame start position and frame structure of the one polarization insensitive signal, the synchronization header overhead and DSP overhead in the one polarization insensitive signal are extracted; the one polarization insensitivity is not determined according to the DSP overhead. The data portion of the sensitive signal is subjected to frequency offset compensation; carrier phase compensation is performed on the synchronization header overhead according to the synchronization header overhead of the first reference sequence, and the initial MIMO coefficient is determined according to the synchronization header overhead after the carrier phase compensation; The initial phase is determined by the initial MIMO coefficient; the updated MIMO coefficient and the updated phase are determined according to the initial MIMO coefficient and the initial phase; and the frequency offset compensation is performed based on the updated MIMO coefficient and the updated phase. Carrier phase compensation and polarization demultiplexing are performed on the data portion of the one polarization insensitive signal.

In a possible design, the synchronization header overhead is a frame of a first set frame length inserted at a frame header interval between the first polarization state signal and the second polarization state signal; the DSP overhead A frame of a third set frame length that is inserted every second set frame length in a data frame of the first polarization state signal and the second polarization state signal.

In a possible design, when the processing unit performs frame synchronization on the one polarization-insensitive signal to determine a frame start position, the processing unit is specifically configured to calculate the synchronization header overhead and Correlation of a synchronization header overhead of the first reference sequence is used to perform frame synchronization to determine a frame start position.

In a possible design, when the processing unit performs frequency offset compensation on the data portion of the one polarization-insensitive signal according to the DSP overhead, the processing unit is specifically configured to determine the DSP overhead and the first reference sequence. The frequency offset of the DSP overhead is used to perform frequency offset compensation on the data portion of the one polarization insensitive signal according to the offset.

In a possible design, when the processing unit determines the initial MIMO coefficient according to the synchronization header overhead after carrier phase compensation, it is specifically used to calculate the synchronization header overhead after carrier phase compensation through the LMS algorithm to determine the initial MIMO. coefficient.

In a possible design, the processing unit may derive the initial phase C based on the following formula:

The initial MIMO coefficient * the data portion * 1 ^c = a preset reference sequence.

In a possible design, when the processing unit determines the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase, the processing unit is specifically configured to use the initial MIMO coefficient, the The initial phase and LMS algorithm determine the updated MIMO coefficient and the updated phase.

In a third aspect, the present application provides a method for transmitting data. The method includes: generating a polarization insensitive signal, wherein the one polarization insensitive signal includes a first polarization state signal and a second polarization state signal, The first polarization state signal and the second polarization state signal have a special frame structure, and the special frame structure is inserted at a set position of a frame header of the first polarization state signal and the second polarization state signal. Synchronization header overhead, inserting DSP overhead at the set position of the data frame; sending the one polarization insensitive signal.

According to a fourth aspect, the present application provides a device, the device including: a generating unit for generating a polarization insensitive signal, wherein the one polarization insensitive signal includes a first polarization state signal and a second polarization state Signal, wherein the first polarization state signal and the second polarization state signal have a special frame structure, and the special frame structure is a setting of a frame header of the first polarization state signal and the second polarization state signal The location inserts the synchronization header overhead, and the DSP overhead is inserted at the set position of the data frame; the transceiver unit is configured to send the one polarization insensitive signal.

In a fifth aspect, an embodiment of the present application further provides a device, including a processor, a memory, and a communication interface. The memory is used to store a computer program, and the processor is used to read the computer program stored in the memory and implement The first aspect, any design of the first aspect, the third aspect, and the method provided by any one of the third aspect.

According to a sixth aspect, the present application further provides a computer-readable storage medium for storing functions for executing the first aspect, any one of the designs of the first aspect, the third aspect, and any one of the designs of the third aspect. The computer software instructions used include a program designed to execute the first aspect, any one of the designs of the first aspect, the third aspect, and any one of the designs of the third aspect.

In a seventh aspect, the present application provides a computer program product containing instructions, which when executed on a computer, causes the computer to execute the first aspect and / or any one of the designs of the first aspect, the third aspect, and the third aspect. Either design the method described.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic diagram of a minimalist coherent communication system;

2 is a flowchart of a cascading LMS algorithm in the prior art provided by the present application;

3 is a flowchart of data recovery provided by the present application;

4 is a schematic diagram of a data structure provided by the present application;

5 is a flowchart of another data recovery process provided by the present application;

FIG. 6 is a schematic diagram of a DSP algorithm provided by the present application;

FIG. 7 is a schematic diagram of a device provided by this application;

8 is a schematic diagram of another device provided by the present application;

FIG. 9 is a hardware structural diagram of a device provided by the present application.

detailed description

The embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

The embodiments of the present application provide a data recovery method and device, which are used to solve the problem of how to perform stable and accurate data recovery on an arbitrary polarization state signal received by a minimalist coherent optical receiver in the prior art. Among them, the method and equipment are based on the same inventive concept. Since the principle of the method and the equipment to solve the problem is similar, the implementation of the equipment and the method can refer to each other, and the duplicated parts are not described again.

With the development of metro optical networks, in order to ensure the transmission of data during communication, a coherent communication system is used to select the wavelength channel. The coherent communication system uses traditional coherent receivers, including 90 ° optical mixers (optical hybrids) and Polarized beam splitter (PBS), but the structure is complex, expensive, high power consumption, and difficult for users to accept. For this reason, a minimalist coherent communication system 100 is proposed in the prior art. As shown in FIG. 1, the transmitting DP-IQ modulator 110 uses Alamouti coding on the signal to generate optical signals of two arbitrary polarization states, X and Y. It is a minimalist coherent optical receiver 120. The minimalist coherent optical receiver 120 does not include a 90 ° optical mixer and a polarized beam splitter. The received signal is an arbitrary polarization state. The minimalist coherent optical receiver 120 uses only one The coupler achieves coherent reception. Compared to traditional coherent optical receivers, the minimalist coherent optical receiver reduces the production cost and difficulty and has great cost advantages. However, the signals received by the minimalist coherent optical receiver include X and Y. A polarization-insensitive signal with any polarization state cannot use traditional DSP algorithms to achieve data recovery. In order to recover polarization-insensitive signal data, two solutions have been proposed in the prior art. The first solution is a digital signal processing (DSP) algorithm that implements data recovery in the frequency domain. Specifically, in the signal spectrum two Side-inserted probes achieve frequency offset compensation and phase recovery. However, this solution requires accurate filtering of the probe. If the initial frequency offset is large, the probe may be lost and data recovery may fail. When there is an error in the frequency offset compensation, the phase recovery performance is poor, so the system is stable. There is no guarantee. Solution 2: The cascaded LMS algorithm, as shown in Figure 2, can implement phase recovery, polarization demultiplexing, and dispersion compensation in the time domain. However, there is no frame synchronization and frequency offset compensation module in this solution, so it is still impossible to achieve data recovery in the time domain. Therefore, how to perform stable and accurate data recovery on any polarization state signal received by a minimally coherent optical receiver, and realize phase recovery, polarization demultiplexing, frame synchronization, frequency offset compensation, and dispersion compensation are currently problems to be solved.

In the description of this application, terms such as "first" and "second" are used only for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor as indicating or implying order.

In the embodiment of the present application, a minimalist coherent optical receiver may determine a synchronization head overhead and a DSP overhead in a received polarization-insensitive signal, and perform frequency offset compensation on a data portion of the polarization-insensitive signal according to the DSP overhead. , Performing carrier phase compensation on the synchronization head overhead in the polarization insensitive signal according to the synchronization head overhead, determining a MIMO coefficient through a setting algorithm, and further determining the updated MIMO coefficient and the updated phase, and using the updated The MIMO coefficient and the updated phase perform carrier phase compensation and polarization demultiplexing on the data portion of a polarization-insensitive signal, and perform stable and accurate data recovery on any polarization signal received.

The following provides a detailed description of the data recovery solution provided by the present application with reference to the accompanying drawings.

Referring to FIG. 3, a flowchart of a data recovery method provided by the present application is provided. In the following embodiments, the processing process at the transmitting end uses the transmitting DP-IQ modulator shown in FIG. 1 as an execution subject, and the processing at the receiving end uses the minimal coherent optical receiver shown in FIG. 1 as an example for description. The method includes:

Step S301: The originating DP-IQ modulator generates a polarization insensitive signal. The one polarization insensitive signal includes a first polarization state signal and a second polarization state signal. The first polarization state signal and the second polarization state signal have a special frame structure. The special frame structure refers to A synchronization header overhead is inserted into a setting position of a frame header of the first polarization state signal and the second polarization state signal, and a setting position of a data frame in the first polarization state signal and the second polarization state signal is set. The DSP overhead is inserted. The foregoing data frame may also be referred to as a data portion. The synchronization header overhead is a frame of a first set frame length inserted at a frame header interval between the first polarization state signal and the second polarization state signal. ; The DSP overhead is a frame of a third set frame length inserted every second set frame length in a data frame of the first polarization state signal and the second polarization state signal, and the first polarization state A polarization state signal with a larger power in the synchronization header overhead of the signal and the synchronization header overhead of the second polarization state signal may be defined as the first reference sequence.

Step S302: The transmitting DP-IQ modulator sends the one polarization insensitive signal to a minimalist coherent optical receiver.

Step S303: The minimalist coherent optical receiver receives one polarization insensitive signal, performs frame synchronization on the one polarization insensitive signal, and determines a frame start position.

Specifically, a sliding window algorithm may be used to calculate the correlation between the synchronization header overhead of the first set frame length and the synchronization header overhead of the first reference sequence, and according to the calculated correlation, it is not sensitive to the polarization of one channel. The signal is frame-synchronized to determine the frame start position of the polarization insensitive signal of the channel.

For example, as shown in FIG. 4, the first polarization state signal can also be referred to as the polarization state signal of X, which is denoted as Pol.X, and the second polarization state signal can also be referred to as the polarization state signal of Y, which is denoted as Pol.Y. The frame structure of Pol.X and Pol.Y is as shown in Figure 4. The Nbit-length synchronization header overhead is inserted at the frame headers of Pol.X and Pol.Y, respectively, and in Pol.X, respectively. Frames of Pol and Y are inserted into the DSP overhead of Abit length at every Bbit length position. Both Nbit and Abit positions can be set to 0, so that the polarized signal of X and the polarized signal of Y received by the receiver. For the superimposed signal, there is only one polarization signal at the frame overhead.

Step S304: The minimally coherent optical receiver extracts a synchronization header overhead and a DSP overhead in the one polarization insensitive signal according to a frame start position and a special frame structure of the one polarization insensitive signal.

The frame start position is the start position of the data frame, that is, the start position of the data part.

Step S305: The minimally coherent optical receiver performs frequency offset compensation on a data portion of the one polarization insensitive signal according to the DSP overhead. Specifically, a frequency offset between the DSP overhead and the DSP overhead of the first reference sequence is determined, and frequency offset compensation is performed on the data portion of the one polarization insensitive signal according to the offset.

Step S306: The minimally coherent optical receiver performs carrier phase compensation on the synchronization header overhead according to the synchronization header overhead of the first reference sequence, and determines an initial MIMO coefficient according to the synchronization header overhead after the carrier phase compensation. Specifically, the LMS algorithm can be used to calculate the synchronization header overhead after carrier phase compensation to determine the initial MIMO coefficient.

Step S307: The minimally coherent optical receiver determines an initial phase according to the initial MIMO coefficient. Specifically, the initial phase C may be derived by a formula: the initial MIMO coefficient * the data portion * 1 ^c = a preset reference sequence. The preset reference sequence can be set and stored in advance. The data portion is a signal portion in a data frame in the one polarization insensitive signal.

Step S308: The minimally coherent optical receiver determines the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase. Specifically, the initial MIMO coefficient and the initial phase may be calculated by a setting algorithm to determine the updated MIMO coefficient and the updated phase, wherein the setting algorithm may be a cascaded LMS algorithm, or may be For other algorithms, this application does not limit it.

Step S309: The minimally coherent optical receiver performs carrier phase compensation and polarization demultiplexing on the data portion of the one polarization-insensitive signal after frequency offset compensation according to the updated MIMO coefficient and the updated phase. .

In the embodiment of the present application, after the synchronization header overhead and the DSP overhead are extracted in step S304, the subsequent processing flow for the extracted synchronization header overhead and the DSP overhead may be performed in parallel, and the flowchart may also be shown in FIG. 5, assuming the receiver A received polarization-insensitive signal (received signal) is represented by x (n), and the output signal after data recovery is represented by y (n). The specific operation method is the same as the flow in Figure 3, but the expression is different. I won't go into details.

The following describes the LMS cascade algorithm proposed in this application in detail through a detailed embodiment. As shown in FIG. 6, it is a schematic diagram of the DSP algorithm. The received signal x (n) is first frame synchronized, and then divided into two channels simultaneously. Processing, frequency offset compensation is performed all the way, and then parity separation is performed on the signal after frequency offset compensation to obtain x _O (n) and

Perform CPE on the synchronization header overhead all the way, then use the LMS to perform a rough estimation of the MIMO coefficients to obtain the initial MIMO coefficients and initial phases, and then iterate the initial MIMO coefficients and initial phases through the cascaded LMS algorithm to obtain the corrected MIMO coefficients and corrected phases , Through the modified MIMO coefficient and the modified phase-to-parity separation to obtain x _O (n) and

Perform data recovery to get y _o (m) and y _e (m). Combine y _o (m) and y _e (m) into one signal as output. The specific y _o (m) and y _e (m) The formula is as follows:

Among them, p ₁₁ p ₁₂ p ₂₁ p ₂₂ are MIMO coefficients, and c and c * are x _O (n) and

The phase corresponding to the signal. Specifically, the minimum mean square error is used as the objective function. The phase and MIMO coefficient iterative formulas are:

Among them, e _o ← d _o -y _o , e _e ← d _e -y _e , e _o is the difference between the synchronization header overhead of the reference sequence and y _o (m), and e _e is the DSP overhead of the reference sequence and y _e difference value (m) is, d _o is the reference synchronization sequence header overhead, d _e is the reference sequence of DSP overhead;

Among them, e ₁₁ ← d _e {c / | c |} ^-1 -x _e p ₁₁ , and u _p is a preset coefficient value;

among them,

Where e ₂₁ ← d _e {c / | c |} ^-1 -x _e p ₂₁ ,

among them,

Based on the same inventive concept as the method embodiment, a schematic diagram of a device is also provided in this application, as shown in FIG. 7;

The device includes: an obtaining unit 701 for receiving a polarization insensitive signal, and a processing unit 702 for performing frame synchronization on the one polarization insensitive signal to determine a frame start position; according to the one polarization insensitivity The frame start position and frame structure of the signal are used to extract the synchronization header overhead and DSP overhead of the one polarization insensitive signal; perform frequency offset compensation on the data portion of the one polarization insensitive signal according to the DSP overhead; The synchronization head overhead of the first reference sequence is used to perform carrier phase compensation on the synchronization head overhead, and an initial MIMO coefficient is determined according to the synchronization head overhead after the carrier phase compensation; the initial phase is determined according to the initial MIMO coefficient; and the initial MIMO is determined according to the initial MIMO coefficient. The coefficient and the initial phase, determine the updated MIMO coefficient and the updated phase; and perform a data portion of the one polarization-insensitive signal after frequency offset compensation according to the updated MIMO coefficient and the updated phase Carrier phase compensation and polarization demultiplexing.

In a possible implementation manner, the one polarization insensitive signal includes a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal have a special frame structure, In the special frame structure, a synchronization header overhead is inserted at a set position of a frame header of the first polarization state signal and the second polarization state signal, and a DSP overhead is inserted at a set position of a data frame. The synchronization header overhead is a frame of a first set frame length inserted at a frame header interval between the first polarization state signal and the second polarization state signal; and the DSP overhead is at the first polarization state. The data frame of the signal and the second polarization state signal is inserted with a frame of a third set frame length every second set frame length.

Exemplarily, the first reference sequence may select a reference sequence corresponding to a polarization signal with a larger power out of a synchronization head overhead of the first polarization state signal and a synchronization head overhead of the second polarization state signal.

The processing unit 702 may specifically perform frame synchronization by calculating the correlation between the synchronization header overhead of the first set frame length and the synchronization header overhead of the first reference sequence to determine the frame start position. And by determining a frequency offset between the DSP overhead and the DSP overhead of the first reference sequence, frequency offset compensation may be performed on the data portion of the one polarization insensitive signal according to the offset.

The processing unit 702 may calculate a synchronization header overhead after carrier phase compensation by using an LMS algorithm to determine an initial MIMO coefficient. Then, the initial phase C is derived based on the formula: the initial MIMO coefficient * the data part * 1 ^c = a preset reference sequence.

The processing unit 702 may further determine the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient, the initial phase, and the LMS algorithm.

Based on the same inventive concept as the method embodiment, this application also provides a schematic diagram of a device for indicating the structure of the originator. As shown in FIG. 8, the device includes a generating unit 801 for generating a polarization insensitive signal. Wherein, the one polarization insensitive signal includes a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal have a special frame structure, and the special frame structure is Insert a synchronization header overhead at the set position of the frame header of the first polarization state signal and the second polarization state signal, and insert a DSP overhead at the set position of the data frame; the transceiver unit 802 is configured to send the polarization of one channel Insensitive signals.

Optionally, the synchronization header overhead is a frame of a first set frame length inserted at a frame header interval between the first polarization state signal and the second polarization state signal; and the DSP overhead is at the Among the data frames of the first polarization state signal and the second polarization state signal, frames of a third set frame length are inserted every second set frame length.

The division of the modules in the embodiment of the present application is schematic, and is only a logical function division. In actual implementation, there may be another division manner. In addition, each functional module in each embodiment of the present application may be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module. The above integrated modules can be implemented in the form of hardware or software functional modules.

When the integrated module can be implemented in the form of hardware, as shown in FIG. 9, a device may include a processor 902. The hardware of the entity corresponding to the processing unit 702 and the generating unit 801 may be the processor 902. The processor 902 may be a central processing module (English: central processing unit, CPU for short), or a digital processing module. The device may further include a communication interface 901 (which may be a transceiver), and the hardware entity corresponding to the foregoing obtaining unit 701 and the receiving and sending unit 802 may be the communication interface 901. The device may further include: a memory 903, configured to store a program executed by the processor 902. The memory 903 may be a non-volatile memory, such as a hard disk (English: hard disk drive (abbreviation: HDD)) or a solid-state hard disk (English: solid-state drive (abbreviation: SSD)), etc., or a volatile memory (English: volatile memory), such as random-access memory (English: random-access memory, abbreviation: RAM). The memory 903 is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and can be accessed by a computer, but is not limited thereto.

The processor 902 is configured to execute the program code stored in the memory 903, and is specifically configured to execute the method according to the embodiment shown in FIG. 3. For details, reference may be made to the method described in the embodiment shown in FIG. 3, which is not repeatedly described in this application.

The embodiments of the present application are not limited to the specific connection medium between the communication interface 901, the processor 902, and the memory 903. In the embodiment of the present application, the memory 903, the processor 902, and the communication interface 901 are connected by a bus 904 in FIG. 9. The bus is indicated by a thick line in FIG. 9. The connection modes of other components are only schematically illustrated. It is not limited. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only a thick line is used in FIG. 9, but it does not mean that there is only one bus or one type of bus.

An embodiment of the present invention further provides a computer-readable storage medium for storing computer software instructions to be executed to execute the processor, which includes a program for executing the processor.

Those skilled in the art should understand that the embodiments of the present application may be provided as a method, a system, or a computer program product. Therefore, this application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, this application may take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above processes does not mean the order of execution, and some or all of the steps may be performed in parallel or sequentially. The execution order of each process shall be based on its function and The internal logic is determined without any limitation to the implementation process of the embodiments of the present application.

This application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to this application. It should be understood that each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to produce a machine, so that instructions generated by the processor of the computer or other programmable data processing device may be used to Means for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to work in a specific manner such that the instructions stored in the computer-readable memory produce a manufactured article including an instruction device, the instructions The device implements the functions specified in one or more flowcharts and / or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of steps can be performed on the computer or other programmable device to produce a computer-implemented process, which can be executed on the computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more flowcharts and / or one or more blocks of the block diagrams.

Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. In this way, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A data recovery method, characterized in that the method includes:

Receiving a polarization insensitive signal, performing frame synchronization on the polarization insensitive signal, and determining a frame start position;

Extracting a synchronization header overhead and a digital signal processing DSP overhead in the one polarization insensitive signal according to a frame start position and a frame structure of the one polarization insensitive signal;

Performing frequency offset compensation on the data portion of the one polarization insensitive signal according to the DSP overhead;

Performing carrier phase compensation on the synchronization header overhead according to the synchronization header overhead of the first reference sequence, and determining an initial MIMO coefficient according to the synchronization header overhead after the carrier phase compensation;

Determining an initial phase according to the initial MIMO coefficient;

Determining the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase;

Carrier phase compensation and polarization demultiplexing are performed on the data portion of the one polarization-insensitive signal after frequency offset compensation according to the updated MIMO coefficient and the updated phase.
The method according to claim 1, wherein the one polarization insensitive signal comprises a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal have A special frame structure that inserts a synchronization header overhead at a set position of a frame header of the first polarization state signal and the second polarization state signal and inserts a DSP overhead at a set position of a data frame;

The synchronization header overhead is a frame of a first set frame length inserted between the frame headers of the first polarization state signal and the second polarization state signal; and the DSP overhead is at the first polarization state signal. And a frame of a third set frame length that is inserted every second set frame length of the data frame of the second polarization state signal.
The method according to claim 1, wherein the first reference sequence is corresponding to a polarized signal with a higher power among a synchronization header overhead of the first polarization state signal and a synchronization header overhead of the second polarization state signal. Reference sequence.
The method according to claim 2, wherein performing frame synchronization on the one polarization-insensitive signal to determine a frame start position comprises:

A frame start position is determined by calculating a correlation between the synchronization header overhead of the first set frame length and the synchronization header overhead of the first reference sequence.
The method of claim 1, wherein performing frequency offset compensation on the data portion of the one polarization insensitive signal according to the DSP overhead comprises:

Determine a frequency offset between the DSP overhead and the DSP overhead of the first reference sequence, and perform frequency offset compensation on the data portion of the one polarization insensitive signal according to the offset.
The method according to claim 1, wherein determining the initial MIMO coefficient according to a synchronization header overhead after carrier phase compensation comprises:

The LMS algorithm is used to calculate the synchronization header overhead after carrier phase compensation to determine the initial MIMO coefficient.
The method according to claim 1, wherein determining the initial phase according to the initial MIMO coefficient comprises:

The initial phase C is derived based on the following formula:

The initial MIMO coefficient * the data portion * 1 c = a preset reference sequence.
The method according to claim 1, wherein determining the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase comprises:

Determining the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient, the initial phase, and the LMS algorithm.
A data recovery device, characterized in that the device includes:

An acquisition unit for receiving a polarization insensitive signal;

Processing unit for:

Performing frame synchronization on the one polarization insensitive signal to determine a frame start position;

Extracting a synchronization header overhead and a digital signal processing DSP overhead in the one polarization insensitive signal according to a frame start position and a frame structure of the one polarization insensitive signal;

Performing frequency offset compensation on the data portion of the one polarization insensitive signal according to the DSP overhead;

Performing carrier phase compensation on the synchronization header overhead according to the synchronization header overhead of the first reference sequence, and determining an initial MIMO coefficient according to the synchronization header overhead after the carrier phase compensation;

Determining an initial phase according to the initial MIMO coefficient;

Determining the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase;

Carrier phase compensation and polarization demultiplexing are performed on the data portion of the one polarization-insensitive signal after frequency offset compensation according to the updated MIMO coefficient and the updated phase.
The device according to claim 9, wherein the one polarization insensitive signal comprises a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal have A special frame structure that inserts a synchronization header overhead at a set position of a frame header of the first polarization state signal and the second polarization state signal, and inserts a DSP overhead at a set position of a data frame;

The synchronization header overhead is a frame of a first set frame length inserted between the frame headers of the first polarization state signal and the second polarization state signal; and the DSP overhead is at the first polarization state signal. And a frame of a third set frame length that is inserted every second set frame length of the data frame of the second polarization state signal.
The apparatus according to claim 9, wherein the first reference sequence is corresponding to a polarized signal with a higher power among a synchronization header overhead of the first polarization state signal and a synchronization header overhead of the second polarization state signal. Reference sequence.
The apparatus according to claim 10, wherein when the processing unit performs frame synchronization on the one polarization-insensitive signal to determine a frame start position, the processing unit is specifically configured to:

A frame start position is determined by calculating a correlation between the synchronization header overhead of the first set frame length and the synchronization header overhead of the first reference sequence.
The apparatus according to claim 9, wherein the processing unit is specifically configured to: when performing frequency offset compensation on a data portion of the one polarization insensitive signal according to the DSP overhead:

Determine a frequency offset between the DSP overhead and the DSP overhead of the first reference sequence, and perform frequency offset compensation on the data portion of the one polarization insensitive signal according to the offset.
The apparatus according to claim 9, wherein the processing unit is specifically configured to: when determining an initial MIMO coefficient according to a synchronization header overhead after carrier phase compensation:

The LMS algorithm is used to calculate the synchronization header overhead after carrier phase compensation to determine the initial MIMO coefficient.
The apparatus according to claim 9, wherein when the processing unit determines an initial phase according to the initial MIMO coefficient, the processing unit is specifically configured to:

The initial phase C is derived based on the following formula:

The initial MIMO coefficient * the data portion * 1 c = a preset reference sequence.
The apparatus according to claim 9, wherein when the processing unit determines the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient and the initial phase, the processing unit is specifically configured to:

Determining the updated MIMO coefficient and the updated phase according to the initial MIMO coefficient, the initial phase, and the LMS algorithm.
A data sending method, characterized in that the method includes:

Generating one polarization insensitive signal, wherein the one polarization insensitive signal includes a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal have a special frame structure, The special frame structure is to insert a synchronization header overhead at a set position of a frame header of the first polarization state signal and the second polarization state signal, and insert a DSP overhead at a set position of a data frame;

Sending the one polarization insensitive signal.
The method according to claim 17, wherein the synchronization header overhead is a frame of a first set frame length inserted at a frame header interval between the first polarization state signal and the second polarization state signal. The DSP overhead is a frame of a third set frame length that is inserted every second set frame length in a data frame of the first polarization state signal and the second polarization state signal.
A data sending device, characterized in that the device includes:

A generating unit for generating a polarization insensitive signal, wherein the one polarization insensitive signal includes a first polarization state signal and a second polarization state signal, wherein the first polarization state signal and the second polarization state signal It has a special frame structure, which inserts a synchronization header overhead at a set position of a frame header of the first polarization state signal and the second polarization state signal, and inserts a DSP overhead at a set position of a data frame;

The transceiver unit is configured to send the one polarization insensitive signal.
The apparatus according to claim 19, wherein the synchronization header overhead is a frame of a first set frame length inserted at a frame header interval between the first polarization state signal and the second polarization state signal. The DSP overhead is a frame of a third set frame length that is inserted every second set frame length in a data frame of the first polarization state signal and the second polarization state signal.
A device characterized by comprising a processor, a memory and a communication interface;

The memory stores a computer program;

The processor is configured to call and execute a computer program stored in the memory, and implement the method according to any one of claims 1-8 or 17-18 through the communication interface.
A computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and when the instructions are run on a computer, the computer causes the computer to execute any one of claims 1-8 or 17-18 The method described.