CN111988127A

CN111988127A - Information synchronization method and device

Info

Publication number: CN111988127A
Application number: CN201910440856.3A
Authority: CN
Inventors: 张阔; 周雷; 李胜平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2019-05-24
Filing date: 2019-05-24
Publication date: 2020-11-24
Anticipated expiration: 2039-05-24
Also published as: CN111988127B

Abstract

The embodiment of the application provides a method and a device for synchronizing information, wherein the method comprises the following steps: an optical line terminal OLT receives a first physical signal sent by an optical network unit ONU; the OLT determines synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; the first synchronization information is prestored in the OLT, and the second synchronization information is located in a preamble of the first physical signal; and when the synchronization related information meets a preset threshold value, the OLT determines that the second synchronization information is synchronized with the preprocessed first synchronization information. The method uses the first synchronization information with shorter local synchronization information length in comparison with the traditional technology, and determines the synchronization related information according to the preprocessed first synchronization information and the received first physical signal, thereby improving the synchronization accuracy of the second synchronization information and the preprocessed first synchronization information, and improving the speed and quality of the physical signal in the transmission process.

Description

Information synchronization method and device

Technical Field

The present application relates to the field of passive optical networks, and in particular, to a method and an apparatus for information synchronization.

Background

In recent years, broadband access technology has been rapidly developed, networks such as Gigabit Passive Optical Network (GPON) and Ethernet Passive Optical Network (EPON) have been widely popularized and rapidly expanded, and 10G PON has also entered a scale deployment stage. Meanwhile, the next generation PON is gradually established and improved, and the transmission rate thereof is significantly increased, and for this reason, an International Telecommunication Union (ITU) established a 50G PON in 2018.

Digital Signal Processing (DSP) will play an important role in 50G PON or higher speed access network systems. Because the transmitted signal is easily distorted during high-rate transmission, the quality of the signal transmission needs to be ensured by means of the DSP in order to ensure the quality of the signal transmission. Generally, for uplink, equalizer coefficients of a DSP are obtained through training data convergence, and a primary task of performing equalizer coefficient training is to synchronize local training information with training information in a received physical signal, where the physical signal includes a preamble and a load (payload), and the preamble of the physical signal includes synchronization information and training information.

In the prior art, a common processing method for synchronizing local training information with training information in a received physical signal is as follows: adding a section of local synchronization information (also called as third synchronization information) before the local training information, directly performing convolution calculation on the third synchronization information and the received physical signal, and searching the maximum synchronization related information from the convolution calculation result to determine that the local training information is synchronous with the training information in the received physical signal. However, the length of synchronization information required by the access network system has a great correlation with signal quality: a longer synchronization information length may degrade the quality of data transmission, e.g., reduce bandwidth efficiency; meanwhile, the requirement of the length of the preamble of the signal in uplink transmission is increased. The length of the preamble code has strict requirements in the current access network standard, for example, in an XGS-PON, 1280 bits (bit) is used as the maximum length of the preamble code, and therefore, an efficient synchronization mode needs to be found, and the synchronization accuracy of the local training sequence is improved.

Disclosure of Invention

The embodiment of the application provides an information synchronization method and device, local synchronization information (also called as first synchronization information) which is shorter than third synchronization information is used, and the synchronization between the local training information and the training information in a physical signal is determined by using the preprocessed first synchronization information or a preprocessed received physical signal, so that the quality of signal transmission is improved.

In a first aspect, a method for information synchronization is provided, where the method includes:

an optical line terminal OLT receives a first physical signal sent by an optical network unit ONU;

the OLT determines synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a lead code of the first physical signal;

and when the synchronization related information meets a preset threshold value, the OLT determines that the second synchronization information is synchronized with the preprocessed first synchronization information.

The method uses the first synchronization information with shorter local synchronization information length in comparison with the traditional technology, and determines the synchronization related information of the second synchronization information in the first physical signal and the preprocessed first synchronization information according to the preprocessed first synchronization information and the received first physical signal, thereby improving the related strength of the synchronization related information, improving the synchronization accuracy of the second synchronization information and the preprocessed first synchronization information, and improving the speed and quality of the physical signal in the transmission process.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the preprocessing the first synchronization information includes:

The OLT receives a second physical signal sent by the ONU;

the OLT determines training information in the second physical signal according to the second physical signal and the third synchronization information, wherein the training information is located in a lead code of the second physical signal;

training information of the OLT to obtain an equalizer coefficient of a data signal processing DSP in the OLT;

the OLT preprocesses the first synchronization information according to the equalizer coefficient;

and the third synchronization information is prestored in the OLT, and comprises the first synchronization information.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the determining, by the OLT, training information in the second physical signal according to the second physical signal and the third synchronization information includes:

the OLT determines synchronization related information of fourth synchronization information and third synchronization information in the second physical signal according to the second physical signal and the third synchronization information, wherein the fourth synchronization information is located in a lead code of the second physical signal;

and when the synchronization related information of the fourth synchronization information and the third synchronization information meets a preset threshold, the OLT determines the training information in the second physical signal.

With reference to the first or second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the first synchronization information includes a plurality of symbols; preprocessing first synchronization information according to the OLT equalizer coefficients, comprising:

And delaying each symbol in the first synchronization information, multiplying each delayed symbol by a corresponding equalizer coefficient respectively, and accumulating and outputting to obtain the preprocessed first synchronization information.

With reference to the first aspect, or any one of the foregoing possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the preprocessed first synchronization information is pre-stored in a lookup table of the OLT.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the lookup table includes the preprocessed first synchronization information and a query identifier corresponding to the preprocessed first synchronization information, where the query identifier is an identifier of an ONU that sends the first physical signal.

With reference to the fourth or fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, the first physical signal further includes a search identifier, where the search identifier is used by the OLT to search the preprocessed first synchronization information; before the OLT determines synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, the method further includes:

And the OLT inquires the preprocessed first synchronization information from the lookup table according to the lookup identification.

With reference to the first aspect, or any one of the foregoing possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the determining, by the OLT, synchronization related information of second synchronization information and preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information includes:

and the OLT performs convolution calculation on the first physical signal and the preprocessed first synchronization information to obtain synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal.

In a second aspect, a method for synchronizing information is provided, the method comprising:

the OLT determines synchronization related information of second synchronization information and first synchronization information included in the preprocessed first physical signal according to the preprocessed first physical signal and the first synchronization information; the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a lead code of the first physical signal;

and when the synchronization related information meets a preset threshold value, the OLT determines that second synchronization information included in the preprocessed first physical signal is synchronized with the first synchronization information.

The method uses the first synchronization information with shorter local synchronization information length in comparison with the traditional technology, and determines the synchronization related information of the second synchronization information and the first synchronization information in the preprocessed first physical signal according to the preprocessed first physical signal and the first synchronization, thereby improving the related strength of the synchronization related information, improving the synchronization accuracy of the second synchronization information and the first synchronization information in the preprocessed first physical signal, and improving the speed and quality of the physical signal in the transmission process.

With reference to the second aspect, in a first possible implementation manner of the second aspect, before the optical line termination OLT receives the first physical signal sent by the optical network unit ONU, the method further includes:

the OLT receives a second physical signal sent by the ONU;

the OLT determines training information in the second physical signal according to the second physical signal and third synchronization information, wherein the training information is located in a lead code of the second physical signal, the third synchronization information is pre-stored in the OLT, and the third synchronization information comprises first synchronization information;

and the OLT trains the training information to obtain the equalizer coefficient of the data signal processing DSP in the OLT.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the optical line terminal OLT receives the first physical signal sent by the optical network unit ONU, the method further includes:

The OLT receives a second physical signal sent by the ONU;

the OLT determines training information in the second physical signal according to the preprocessed second physical signal and the first synchronization information, the training information is located in a lead code of the second physical signal, and the first synchronization information is prestored in the OLT;

With reference to the first or second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the preprocessing the first physical signal includes:

the OLT preprocesses the physical signal according to the equalizer coefficients.

With reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the first physical signal further includes training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; the OLT pre-processes the first physical signal according to the equalizer coefficient, and comprises the following steps:

and delaying each symbol of the second synchronization information in the first physical signal and the training information in the first physical signal, multiplying each delayed symbol by a corresponding equalizer coefficient respectively, and accumulating and outputting to obtain the preprocessed first physical signal.

With reference to the second aspect, or any one of the foregoing possible implementation manners of the second aspect, in a fifth possible implementation manner of the second aspect, the determining, by the OLT according to the preprocessed first physical signal and the first synchronization information, synchronization related information of the second synchronization information and the first synchronization information included in the preprocessed first physical signal by the OLT includes:

and the OLT performs convolution calculation on the preprocessed first physical signal and the first synchronization information to obtain synchronization related information of the second synchronization information and the first synchronization information included in the preprocessed first physical signal.

In a third aspect, an apparatus for information synchronization is provided, the apparatus comprising:

the receiving unit is used for receiving a first physical signal sent by an Optical Network Unit (ONU);

the processing unit is used for determining synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a lead code of the first physical signal;

and the processing unit is further used for determining that the second synchronization information is synchronized with the preprocessed first synchronization information by the OLT when the synchronization related information meets a preset threshold.

The device uses the first synchronization information with shorter local synchronization information length in comparison with the traditional technology, and determines the synchronization related information of the second synchronization information in the first physical signal and the preprocessed first synchronization information according to the preprocessed first synchronization information and the received first physical signal, thereby improving the related strength of the synchronization related information, improving the synchronization accuracy of the second synchronization information and the preprocessed first synchronization information, and improving the speed and quality of the physical signal in the transmission process.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the preprocessing, by the processing unit, the preprocessing the first synchronization information includes:

the receiving unit is also used for receiving a second physical signal sent by the ONU;

the processing unit determines training information in the second physical signal according to the second physical signal and the third synchronization information, wherein the training information is located in a lead code of the second physical signal;

training information to obtain an equalizer coefficient of a data signal processing DSP in the OLT by a processing unit;

the processing unit preprocesses the first synchronization information according to the equalizer coefficient;

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the processing unit is specifically configured to,

determining fourth synchronization information in the second physical signal and synchronization related information of the third synchronization information according to the second physical signal and the third synchronization information, wherein the fourth synchronization information is located in a lead code of the second physical signal;

With reference to the first or second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the processing unit is further specifically configured to delay each symbol in the first synchronization information, multiply each delayed symbol by a corresponding equalizer coefficient, and accumulate and output the multiplied symbols to obtain the preprocessed first synchronization information.

With reference to the third aspect, or any one of the foregoing possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the preprocessed first synchronization information is pre-stored in a lookup table of the OLT.

With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the lookup table includes the preprocessed first synchronization information and a query identifier corresponding to the preprocessed first synchronization information, where the query identifier is an identifier of an ONU that transmits the first physical signal.

With reference to the fourth or fifth possible implementation manner of the third aspect, in a sixth possible implementation manner of the third aspect, the first physical signal further includes a search identifier, where the search identifier is used by the OLT to search the preprocessed first synchronization information; and the processing unit is further configured to, before the OLT determines synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, query the preprocessed first synchronization information from the lookup table according to the lookup identifier.

With reference to the third aspect, or any one of the foregoing possible implementation manners of the third aspect, in a seventh possible implementation manner of the third aspect, the determining, by the OLT, synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information includes:

In a fourth aspect, an apparatus for synchronizing information is provided, the apparatus comprising:

The device uses the first synchronization information with shorter local synchronization information length in comparison with the traditional technology, and determines the synchronization related information of the second synchronization information and the first synchronization information in the preprocessed first physical signal according to the preprocessed first physical signal and the first synchronization, thereby improving the related strength of the synchronization related information, improving the synchronization accuracy of the second synchronization information and the first synchronization information in the preprocessed first physical signal, and improving the speed and quality of the physical signal in the transmission process.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect,

the processing unit is further configured to determine training information in the second physical signal according to the second physical signal and third synchronization information, where the training information is located in a preamble of the second physical signal, the third synchronization information is pre-stored in the OLT, and the third synchronization information includes the first synchronization information;

and the processing unit is also used for training the training information to obtain the equalizer coefficient of the data signal processing DSP in the OLT.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect,

the processing unit is further used for determining training information in the second physical signal according to the preprocessed second physical signal and the first synchronization information, the training information is located in a lead code of the second physical signal, and the first synchronization information is prestored in the OLT;

With reference to the first or second possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the preprocessing the first physical signal by the processing unit includes:

The processing unit preprocesses the physical signal according to the equalizer coefficients.

With reference to the third possible implementation manner of the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the first physical signal further includes training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; the processing unit preprocesses the first physical signal according to the equalizer coefficients, comprising:

In combination with the fourth aspect, or any one of the above possible implementation manners of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the processing unit is specifically configured to,

In a fifth aspect, an apparatus for information synchronization is provided, the apparatus comprising:

The receiver is used for receiving a first physical signal sent by an optical network unit ONU;

the processor is used for determining synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a lead code of the first physical signal;

and the processor is further used for determining that the second synchronization information is synchronized with the preprocessed first synchronization information by the OLT when the synchronization related information meets a preset threshold.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the processor pre-processes the first synchronization information, and includes:

The receiver is also used for receiving a second physical signal sent by the ONU;

the processor determines training information in the second physical signal according to the second physical signal and the third synchronization information, wherein the training information is located in a lead code of the second physical signal;

training information by a processor to obtain an equalizer coefficient of a data signal processing DSP in the OLT;

the processor preprocesses the first synchronization information according to the equalizer coefficient;

In combination with the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the processor is specifically configured to,

With reference to the first or second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the processor is further specifically configured to delay each symbol in the first synchronization information, multiply each delayed symbol by a corresponding equalizer coefficient, and accumulate and output the multiplied symbols to obtain the preprocessed first synchronization information.

With reference to the fifth aspect or any one of the foregoing possible implementation manners of the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the preprocessed first synchronization information is pre-stored in a lookup table of the OLT.

With reference to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the lookup table includes the preprocessed first synchronization information and a query identifier corresponding to the preprocessed first synchronization information, where the query identifier is an identifier of an ONU that transmits the first physical signal.

With reference to the fourth or fifth possible implementation manner of the fifth aspect, in a sixth possible implementation manner of the fifth aspect, the first physical signal further includes a search identifier, where the search identifier is used by the OLT to search the preprocessed first synchronization information; the processor is further configured to, before the OLT determines synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, query the preprocessed first synchronization information from the lookup table according to the lookup identifier.

With reference to the fifth aspect, or any one of the foregoing possible implementation manners of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the determining, by the OLT, synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information includes:

In a sixth aspect, there is provided an apparatus for information synchronization, the apparatus comprising:

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect,

the processor is further configured to determine training information in the second physical signal according to the second physical signal and third synchronization information, the training information is located in a preamble of the second physical signal, the third synchronization information is pre-stored in the OLT, and the third synchronization information includes the first synchronization information;

and the processor is also used for training the training information to obtain the equalizer coefficient of the data signal processing DSP in the OLT.

With reference to the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect,

the processor is further used for determining training information in the second physical signal according to the preprocessed second physical signal and the first synchronization information, the training information is located in a lead code of the second physical signal, and the first synchronization information is prestored in the OLT;

With reference to the first or second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the processor pre-processes the first physical signal, and includes:

The processor preprocesses the physical signal according to the equalizer coefficients.

With reference to the third possible implementation manner of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the first physical signal further includes training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; the processor pre-processes the first physical signal according to the equalizer coefficients, comprising:

In a fifth possible implementation form of the sixth aspect, in combination with the sixth aspect or any of the preceding possible implementation forms of the sixth aspect, the processor is specifically configured to,

In a seventh aspect, an apparatus for information synchronization is provided, where the apparatus includes a physical chip, a preprocessing module, and a DSP. The preprocessing module is used for preprocessing the first local synchronization information or preprocessing the received first physical signal. The DSP is used for carrying out convolution calculation on the preprocessed first synchronization information and the received first physical signal, or carrying out convolution calculation on the preprocessed first physical signal and the first synchronization information to obtain synchronization related information, further carrying out equalizer training, determining a delimiter and carrying out load equalization.

In an eighth aspect, there is provided a computer program product comprising instructions for performing the method of any one of the possible implementations of the first to second aspects when the instructions are run on a computer.

In a ninth aspect, there is provided a computer readable storage medium storing instructions that, when executed on a computer, implement the method of any one of the first to second aspects.

Based on the provided information synchronization method and device, synchronization related information of second synchronization information and preprocessed first synchronization information included in the first physical signal is determined according to the received first physical signal and the preprocessed first synchronization information, and synchronization of the second synchronization information and the preprocessed first synchronization information is further determined according to the synchronization related information so as to determine that local training information is synchronized with training information in the first physical signal; or, the received first physical signal is preprocessed, the synchronization related information of the second synchronization information and the first synchronization information in the preprocessed first physical signal is determined according to the preprocessed first physical signal and the first synchronization information, and the synchronization of the second synchronization information and the first synchronization information in the preprocessed first physical signal is further determined according to the synchronization related information, so that the synchronization of the local training information and the training information in the preprocessed first physical signal is determined, and the quality of signal transmission is improved. The length of the first synchronization information is shorter than that of the third synchronization information in the prior art, that is, the effect of improving the quality of signal transmission is achieved, and the requirement on the length of the preamble in the physical signal is also avoided.

Drawings

FIG. 1 is a data structure diagram of a physical signal;

FIG. 2 is a schematic flow chart of a method for synchronizing local training information with training information in a received physical signal according to the prior art;

FIG. 3 is a diagram illustrating synchronization related information for synchronizing local training information with training information in a received physical signal according to the prior art;

FIG. 4 is a diagram illustrating a comparison between local training information and synchronization related information of training information in a received physical signal according to the prior art;

FIG. 5 is a schematic diagram of a time-domain pulse of an equalizer provided in an embodiment of the present application;

fig. 6 is a schematic flow chart of a method for information synchronization according to an embodiment of the present application

Fig. 7 is a schematic flowchart illustrating a process of creating a lookup table by an OLT when an ONU is online for the first time according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a preprocessing module provided in an embodiment of the present application;

fig. 9 is a schematic flowchart illustrating a process of using a lookup table in an ONU operating state according to an embodiment of the present application;

FIG. 10 is a schematic diagram of a method for synchronizing information according to an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a preprocessing module provided in an embodiment of the present application;

fig. 12a and 12b show correlation operation results of the conventional scheme when the local synchronization sequence is 128 symbols and 512 symbols; fig. 12c and 12d are the correlation operation results of the received physical signal and the local synchronization information using preprocessing when the local synchronization sequence is 128 symbols and 512 symbols; fig. 12e and 12f show the correlation operation result between the received physical signal and the preprocessed local synchronization information when the local synchronization sequence is 128 symbols and 512 symbols.

FIG. 13 is a schematic diagram of an apparatus according to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of another apparatus provided in an embodiment of the present application;

fig. 15 is a schematic structural diagram of another apparatus provided in the embodiments of the present application.

Detailed Description

The embodiment of the application provides a method and a device for information synchronization, wherein the method and the device for information synchronization are used in an access network system with an equalizer. No equalizer, e.g. DSP, is present in the currently deployed access network systems. The DSP is an important role for guaranteeing the transmission quality of physical signals in future 50G PON or higher speed access network systems. In a Passive Optical Network (PON), a plurality of Optical Network Units (ONUs) and an Optical Line Terminal (OLT) are included, and the ONUs transmit physical signals, which include a preamble and a load (payload), as shown in fig. 1; the preamble includes synchronization information and training information, and the payload is used to carry valid data. In the embodiment of the present application, the physical signal transmitted by the ONU may be understood as a data sequence transmitted by the ONU, where the data sequence includes a preamble and a payload, and the preamble includes a synchronization sequence and a training sequence. In other words, it is understood that the synchronization information in the physical signal is a synchronization sequence and the training information is a training sequence. In this embodiment, a symbol for distinguishing the preamble from the load is provided between the preamble and the load, and the symbol is referred to as a delimiter.

For uplink, the quality of physical signal transmission is guaranteed through a DSP, equalizer training is to be performed, that is, equalizer coefficients of the DSP are obtained through training data convergence, and the primary task of obtaining the converged equalizer coefficients is to synchronize local training information with training information in a received physical signal, artificially insert a segment of synchronization information in front of the local training information in order to synchronize the training information in the received physical signal with the local training information, and then find synchronization related information of the synchronization information in the physical signal and the local synchronization information in a convolution manner, so as to determine that the synchronization information in the received physical signal is synchronized with the local synchronization information, that is, to determine that the training information in the received physical signal is synchronized with the local training information.

In the currently studied 50G PON, the general practice of synchronizing training information in a physical signal with local training information is determined (as shown in fig. 2): directly convolving the local synchronization information and the received physical signal, then searching the synchronization related information of the synchronization information and the local synchronization information in the physical signal, then carrying out subsequent equalizer training, further determining a delimiter, and further balancing a load (payload).

In the embodiment of the present application, the synchronization correlation information is information for determining a synchronization correlation peak of the synchronization information in the physical signal synchronized with the local synchronization information, as shown in fig. 3, when the physical signal is in the synchronous stateWhen the synchronization information of (a) is synchronized with the local synchronization information, a significant synchronization correlation peak occurs. Fig. 3 is a schematic diagram of a synchronization correlation peak of synchronization information and local synchronization information in a physical signal, and in fig. 3, the abscissa is the position of a bit and the ordinate is a correlation peak. Only the convolution results of the four periodic physical signals with the local synchronization information are truncated in fig. 3. As shown in FIG. 3, the synchronous correlation peaks are located at 0.2 × 10⁴，2.7×10⁴，6.3×10⁴， 10×10⁴The position of the bit.

The method for determining synchronization of synchronization information in physical signals and local synchronization information at present can obtain converged equalizer coefficients, but the synchronization information in the physical signals is greatly related to the quality in the transmission process of the physical signals, when the bandwidth of an OLT and the dispersion of optical fibers cause serious optical signal damage, the synchronization needs to be performed by using longer synchronization information, so that the synchronization information in the physical signals can be more accurately determined to be synchronous with the local synchronization information, i.e. the synchronization of the training information in the physical signals and the local training information can be more accurately determined, and the training information is further trained to obtain the converged equalizer coefficients.

The longer synchronization information is used for synchronization, so that the bandwidth efficiency is reduced to a certain extent, and the requirement on the length of the uplink preamble code is increased. On the other hand, the length of the preamble is strictly specified in the current access network standard, for example, the target length in the XGS-PON is 1280 bits (-128 ns), and therefore, an efficient synchronization mode is sought, and the synchronization accuracy of the training sequence is improved.

Therefore, the embodiment of the application provides a method for synchronizing by using local synchronization information with shorter length than that of the local synchronization information in the prior art, so that the accuracy of training information is improved, and the accuracy of physical signal transmission is further improved.

Because longer synchronization information is needed for subsequent equalizer training when the received physical signal is poor, fig. 4 shows the synchronization correlation peak of a 50G non-return-to-zero (NRZ) signal at-27 dBm received optical power of a 25G optical device, where the abscissa is the position of a bit and the ordinate is the correlation peak in fig. 4. Wherein four cycles in the received physical signal are intercepted, and the length of the local synchronization information is 128 bits and 512 bits respectively. As shown in fig. 4, it can be seen that when the length of the local synchronization information is 128 bits, the synchronization correlation peak after convolution of the received physical signal and the local synchronization information is very poor, and in this case, the problem of synchronization misalignment is easily transmitted. When the length of the local synchronization information is increased to 512 bits, a synchronization correlation peak after convolution of the received physical signal and the local synchronization information is obvious. However, too long local synchronization sequences will reduce data transmission efficiency.

Based on this, the embodiments of the present application improve the strength of the synchronization correlation peak and improve the synchronization accuracy in the following manner.

The first method is as follows: the local synchronization information is preprocessed to simulate a process that the local synchronization information experiences channel damage, that is, simulate channel damage caused by the transmission of the local synchronization information through a channel, such as: signal power reduction due to channel impairments during signal transmission, etc. When the uplink burst data, namely the OLT receives a physical signal sent by the ONU, the OLT determines the synchronization related information, namely the synchronization peak, of the synchronization information and the local synchronization information in the physical signal according to the preprocessed local synchronization information of the received physical signal; when the synchronization related information meets a preset threshold value, determining that the synchronization information of the physical signal is synchronous with the local synchronization information, and further determining that the training information of the physical signal is synchronous with the local training sequence; and finally, the OLT carries out subsequent processes such as equalizer training and the like.

The second method comprises the following steps: when the uplink burst data, that is, the OLT receives the physical signal sent by the ONU, the received physical signal is preprocessed to improve the signal quality, for example, the signal-to-noise ratio, of the received physical signal. In the process of physical signal transmission, due to optical signal damage caused by factors such as device bandwidth or optical fiber dispersion, received physical signals are preprocessed, so that the received physical signals reduce damage caused in channel transmission. Then, the OLT determines synchronization correlation information, namely synchronization correlation peaks, of the synchronization information and the local synchronization information in the physical signal after the preprocessing according to the physical signal after the preprocessing and the local synchronization information; when the synchronization related information meets a preset threshold, determining that the synchronization information of the preprocessed physical signal is synchronous with the local synchronization information, and further determining that the training information of the preprocessed physical signal is synchronous with the local training sequence; and finally, the OLT carries out subsequent processes such as equalizer training and the like.

In this embodiment of the present application, according to the inherent upstream burst time division multiplexing characteristic of the PON system, the OLT performs preprocessing on the local synchronization information or the currently received physical signal by using an equalizer coefficient obtained by convergence of a physical signal sent by an ONU upstream burst received at the previous time or a previous number of times. The specific process is as follows:

let r (t) be the received physical signal; h (t) is the equalizer time domain pulse used in the preprocessing, as shown in fig. 5, the abscissa shown in fig. 5 is the number of equalizer coefficients, and the ordinate is the value of the equalizer coefficients; s (t) is local synchronization information.

The process of the first mode is as follows: preprocessing local synchronization information by performing convolution operation on the local synchronization information and equalizer coefficients obtained by convergence of previously received physical signals, i.e. performing convolution operation on the local synchronization information and the equalizer coefficients

Then, convolution operation is carried out on the preprocessed local synchronous information and the received physical signal

And finding the occurrence position of the correlation peak until the correlation peak is found, and completing the synchronization.

In the process, the process of preprocessing the local synchronous information is equivalent to convolution operation of the local synchronous information and the coefficient of the equalizer, the synchronous process is also equivalent to convolution operation, and a second mode can be obtained according to the interchangeability of the convolution.

The process of the second mode is as follows: preprocessing the received physical signal and performing a convolution operation on the received physical signal with equalizer coefficients obtained by convergence of the previously received physical signal or the previously received physical signals, i.e.

Then, carrying out convolution operation on the preprocessed physical signal and the local synchronous information

The convolution operation is a correlation operation. In the embodiment of the present application, local synchronization information is pre-stored in the OLT, and the local synchronization information is a symbol sequence included in a physical signal received by the OLT, for example, for an OOK symbol, the local synchronization information may be a symbol sequence of 0,1,0,0,1 …; for PAM4 symbols, the local synchronization information may be a symbol sequence of 0,1,2,2,1,3,0 ….

It should be noted that the synchronization correlation peak is a sequence maximum value after convolution operation of the preprocessed physical signal and the local synchronization information, or after convolution operation of the received physical signal and the preprocessed local synchronization information, and the maximum value is more obvious, which indicates that the correlation peak is stronger.

According to the embodiment of the application, the more obvious correlation peak can be obtained through the shorter local synchronization information.

The following describes aspects of embodiments of the present application with reference to the drawings. In the embodiments of the present application, the terms "first", "second", "third", and "fourth" are merely used to distinguish information, and do not limit the information itself.

Fig. 6 is a flowchart illustrating a method for information synchronization according to an embodiment of the present application. As shown in fig. 6, the main body of the method is the OLT, and the method may include the following steps:

s101, the OLT receives a first physical signal sent by the ONU.

When the data burst is carried out, the OLT receives a first physical signal sent by the ONU. The first physical signal includes a preamble including synchronization information and training information and a payload. The data structure is shown in fig. 1.

S102, the OLT determines synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information.

Wherein the first synchronization information is local synchronization information pre-stored by the OLT, for example, the first synchronization information may be 10010110 …. The synchronization information included in the first physical signal is referred to as second synchronization information.

In one embodiment, the processed first synchronization information may be local synchronization information that is pre-processed before the OLT receives the first physical signal and is stored in the OLT.

In one embodiment, the process of preprocessing the first synchronization information may specifically be: the OLT receives a second physical signal sent by the ONU, wherein the second physical signal comprises a lead code, and the lead code comprises synchronization information (also called fourth synchronization information) and training information; the OLT determines training information in the second physical signal according to the second physical signal and the third synchronous information; the OLT trains the training information to obtain an equalizer coefficient; and the OLT preprocesses the first synchronization information according to the equalizer coefficient.

In other words, the OLT performs convolution operation on the first synchronization information and the physical signal (also called a second physical signal) received at the previous time or previous times, and the equalizer coefficient obtained by convergence to obtain the preprocessed first synchronization information. This situation may be the initial on-line process of the OLT, as shown in fig. 7.

As shown in fig. 7, when the ONU is on-line for the first time, and the OLT receives a second physical signal sent, the second physical signal includes a preamble, and the preamble includes fourth synchronization information and training information; the OLT determines a synchronization correlation peak of fourth synchronization information and third synchronization information in the second physical signal according to the received second physical signal and local synchronization information, i.e., third synchronization information (which is long enough), for example, 10010110 …, when a peak value of the synchronization correlation peak is within a preset range, the OLT determines that the fourth synchronization information is synchronized with the third synchronization information, i.e., determines a position of the fourth synchronization information in the second physical signal, i.e., determines training information in the second physical signal, and then the OLT trains the training information, i.e., performs equalizer training to obtain a converged equalizer coefficient. The OLT then preprocesses the first synchronization information with the equalizer coefficients to obtain preprocessed first synchronization information, e.g. 10010110 ….

It should be noted that the third synchronization information here is local synchronization information pre-stored in the OLT in the prior art, and the length of the third synchronization information is longer than that of the first synchronization information in the embodiment of the present application. The embodiment of the application improves the speed and the quality of physical signal transmission by using the first synchronization information which is shorter than the third synchronization information.

When the OLT obtains the equalization coefficient according to the convergence of the physical signal received at the previous time or previous times to preprocess the first synchronization information to obtain the preprocessed first synchronization information, as shown in fig. 7, in an embodiment, the OLT stores the preprocessed first synchronization information in the OLT, for example, in a lookup table of the OLT, and stores a query identifier corresponding to the preprocessed first synchronization information in the lookup table, where the query identifier may be an identifier of the ONU.

So that, when receiving the first physical signal, a Media Access Control (MAC) of the OLT queries the preprocessed first synchronization information according to the query identifier in the first physical signal.

In other words, when the ONU is on-line for the first time, since the lookup table of the local synchronization information is not established, the OLT can only perform convolution operation based on the original non-preprocessed local synchronization information, i.e. the third synchronization information, which is required to be long enough to achieve accurate synchronization. After the synchronization is completed and the equalizer training is finished, a physical chip (physical layer logic chip) of the OLT preprocesses original synchronization information which is not preprocessed, namely first synchronization information, by using the equalizer coefficient obtained by the training. At this time, only part of the third synchronization information (i.e., the first synchronization information) needs to be used for preprocessing, and the preprocessed first synchronization information is stored in the lookup table, so that the process of creating the local synchronization information (after preprocessing) is completed. For example, when an ONU is on-line for the first time, synchronization information with a length of 512 symbols may be used, and then, after the data of the ONU arrives at the OLT again, only the first 128 symbols of the synchronization sequence may be selected as the synchronization information, and the remaining symbols are automatically used as the training sequence.

In one embodiment, the first synchronization information includes a plurality of symbols. The OLT pre-processes the first synchronization information according to the equalizer coefficients, comprising: and delaying each symbol in the first synchronization information, multiplying each delayed symbol by the corresponding equalizer coefficient respectively, and accumulating and outputting to obtain the preprocessed first synchronization information.

Specifically, the OLT may preprocess the first synchronization information through a preprocessing module, as shown in fig. 8, where the preprocessing module includes an adding circuit and a delay circuit. For example, the first synchronization information is 10010110 … with 512 bits, and the used equalizer coefficients are 41 (e.g., 0.1, 0.2, 0.6, 0.3 …), the OLT delays each symbol in the first synchronization information 10010110 … through the delay circuit, so that the first bit 1 of the first synchronization information 10010110 … is multiplied by the first equalizer coefficient 0.1 in the equalizer coefficients, the second bit 0 of the first synchronization information 10010110 … is multiplied by the second equalizer coefficient 0.2 in the equalizer coefficients, and the third bit 0 of the first synchronization information 10010110 … is multiplied by the third equalizer coefficient 0.6 in the equalizer coefficients, which are sequentially multiplied correspondingly; when 41 coefficients are used once, the first equalizer coefficient is multiplied with the 42 th bit in the first synchronization information periodically, the multiplication results are multiplied correspondingly in turn, and the multiplication results are added through an adding circuit and then output to obtain the preprocessed first synchronization information.

Optionally, in one embodiment, in order to reduce the complexity of the convolution operation, the coefficients of the equalizer may be reduced, for example, 21 equalizer coefficients may be used.

In an embodiment, in the operation process of the OLT, as shown in fig. 9, when the MAC of the OLT receives the first physical signal, the first physical signal may further include an inquiry identifier, where the inquiry identifier may be an identifier of an ONU that transmits the first physical signal; the OLT inquires the preprocessed first synchronization information according to the inquiry identification, directly determines the related information of the second synchronization information in the first physical signal and the preprocessed first synchronization information according to the received first physical signal and the preprocessed first synchronization information, and further determines whether the second synchronization information in the first physical signal is synchronous with the preprocessed first synchronization information.

In other words, when an ONU is in operation, as shown in fig. 9, the MAC notifies the physical chip of the identifier of the next ONU, and the physical chip retrieves the preprocessed first synchronization information corresponding to the ONU by reading the created lookup table. And then, the physical chip uses the preprocessed first synchronization information to carry out convolution operation with the received data sequence, and searches a correlation peak. And finally, after synchronization is finished and training is finished, the physical chip determines whether to update the lookup table, if the lookup table needs to be updated, the physical chip directly uses the equalizer coefficient obtained in the current ONU operation process to perform convolution calculation with the first synchronization information, updates the preprocessed first synchronization information, and finishes the updating process. The lookup table may be updated periodically, for example, once every 10000 upstream burst data packets arrive.

Optionally, in an embodiment, the determining, by the OLT, synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information includes: and the OLT performs convolution calculation on the first physical signal and the preprocessed first synchronization information to obtain synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal.

S103, when the synchronization related information meets a preset threshold, the OLT determines that the second synchronization information is synchronized with the preprocessed first synchronization information.

In the process, the synchronization related information may be a synchronization related peak of the second synchronization information and the preprocessed first synchronization information, and when a peak value of the synchronization related peak of the second synchronization information and the preprocessed first synchronization information is within a preset threshold range, the OLT determines that the second synchronization information is synchronized with the preprocessed first synchronization related information, that is, may determine a position of the synchronization information in the preamble, and further may determine a position of the training information in the first physical signal.

Then, training of the equalizer is carried out to obtain converged equalizer coefficients, a delimiter is determined, and further load balancing is carried out, which is a part of the prior art and is not described in detail again for this reason.

The first synchronization information with shorter length compared with the currently used third synchronization information is adopted, so that the speed and the quality of physical signal transmission are improved, the synchronization related information is further enhanced through the preprocessed first synchronization information, and the synchronization accuracy is improved.

Fig. 10 is a schematic flowchart of another method for information synchronization according to an embodiment of the present application, and as shown in fig. 10, an execution main body of the method is an OLT, and the method may include the following steps:

s201, the OLT receives a first physical signal sent by the ONU.

When the data burst is carried out, the OLT receives a first physical signal sent by the ONU. The first physical signal includes a preamble and a payload, and the preamble includes synchronization information (also referred to as second synchronization information) and training information. The data structure is shown in fig. 1.

S202, the OLT determines synchronization related information of second synchronization information and first synchronization information included in the preprocessed first physical signal according to the preprocessed first physical signal and the first synchronization information.

Wherein the first synchronization information is pre-stored in the OLT, and the first synchronization information may be 10010110 ….

And when the OLT receives the first physical signal, the OLT preprocesses the received first physical signal according to the equalizer coefficient of the DSP. Wherein, in one embodiment, the equalizer coefficients are equalizer coefficients obtained by convergence of the physical signal received by the OLT at one or several previous times. Before the OLT receives a first physical signal sent by the ONU, the OLT receives a physical signal (also called a second physical signal) sent by the ONU, the second physical signal includes a preamble, and the preamble includes synchronization information (also called fourth synchronization information) and training information; the OLT determines training information in the second physical signal according to the second physical signal and third synchronization information, wherein the third synchronization information is pre-stored in the OLT, the length of the third synchronization information is longer than that of the first synchronization information, and the first synchronization information can be part of the third synchronization information, namely the third synchronization information comprises the first synchronization information; and the OLT trains the training information to obtain the coefficient of the equalizer.

In one embodiment, the OLT determines training information in the second physical signal according to the second physical signal and third synchronization information, including: and the OLT performs convolution calculation on the second physical signal and the second synchronization information to obtain a synchronization correlation peak of fourth physical information and third synchronization information in the second physical signal, determines whether the fourth synchronization information and the third synchronization information are synchronous according to the correlation peak of the fourth synchronization information and the third synchronization information, and determines that the fourth synchronization information and the third synchronization information are synchronous when the peak value of the synchronization correlation peak of the fourth synchronization information and the third synchronization information is within a preset threshold range, namely determines the position of the fourth synchronization information in the second physical signal, namely determines the training information in the second physical signal.

Optionally, in an embodiment, the obtaining process of the equalizer coefficient may specifically be: before the OLT receives a first physical signal sent by the ONU, the OLT receives a second physical signal sent by the ONU, wherein the second physical signal comprises a lead code, and the lead code comprises synchronization information and training information; the OLT determines training information in the second physical signal according to the preprocessed second physical signal and first synchronization information, and the first synchronization information is prestored in the OLT; and the OLT trains the training information to obtain an equalizer coefficient of a data signal processing DSP in the OLT.

In one embodiment, the second synchronization information and the training information in the first physical signal each include a plurality of symbols. The OLT pre-processes the received first physical signal according to the equalizer coefficient of the DSP, and comprises the following steps: and the OLT delays each symbol of the second synchronization information in the first physical signal and the training information in the first physical signal, multiplies each delayed symbol by a corresponding equalizer coefficient respectively, and accumulates and outputs to obtain the preprocessed first physical signal.

In the specific process, the OLT preprocesses the first physical signal through a preprocessing module, as shown in fig. 11, where the preprocessing module includes an adding circuit and a delay circuit. For example, the first physical signal is 10110110 …, and 21 equalizer coefficients are used (e.g., 0.1, 0.2, 0.3, 0.6 …), the OLT delays each symbol in the first physical signal 10110110 … through the delay circuit, the first bit 1 in the first physical signal is multiplied by the first equalizer coefficient 0.1 in the equalizer coefficients, the second bit 0 in the first physical signal 10010110 … is multiplied by the second equalizer coefficient 0.2 in the equalizer coefficients, and the third bit 1 in the first physical signal 10110110 … is multiplied by the third equalizer coefficient 0.3 in the equalizer coefficients, which are sequentially multiplied correspondingly; when 21 coefficients are used once, the first equalizer coefficient is periodically multiplied by the 22 th bit in the first synchronization information, the multiplication results are correspondingly multiplied in sequence, and the multiplication results are added through an adding circuit and then output to obtain the preprocessed first physical signal.

In one embodiment, the OLT determines, according to the preprocessed first physical signal and the first synchronization information, synchronization related information of the second synchronization information and the first synchronization information included in the preprocessed first physical signal, including:

S203, when the synchronization related information satisfies the preset threshold, the OLT determines that the second synchronization information included in the preprocessed first physical signal is synchronized with the first synchronization information.

In this process, the synchronization related information may be a synchronization related peak of the second synchronization information and the first synchronization information in the preprocessed first physical signal, and when a peak value of the synchronization related peak of the second synchronization information and the first synchronization information in the preprocessed first physical signal is within a preset threshold range, the OLT determines that the second synchronization information and the first synchronization related information in the preprocessed first physical signal are synchronized, that is, determines a position of the synchronization information in the preamble, that is, determines the training information in the first physical signal.

The method has the advantages that the first synchronization information with shorter length is adopted compared with the currently commonly used third synchronization information, so that the transmission rate and quality of the physical signals are improved, the synchronization related information of the second synchronization information and the first synchronization information in the preprocessed first physical signals is further determined through the preprocessed first physical signals, the synchronization related information is enhanced, and the synchronization accuracy is improved.

The method for information synchronization provided in the embodiment of the present application uses shorter local synchronization information, determines a correlation peak between synchronization information and local synchronization information in a physical signal by performing convolution calculation on a preprocessed received physical signal and the local synchronization information, or determines a correlation peak between synchronization information and local synchronization information in a preprocessed physical signal by performing convolution operation on the preprocessed physical signal and the preprocessed local synchronization information, so as to improve the transmission rate and quality of the physical signal, as shown in fig. 12a and 12b, fig. 12c and 12d, and fig. 12e and 12f, data results in fig. 12a to 12f are 131072 symbols based on the length of the received physical signal, 4 periods in total, 32768 symbols per period, 128 symbols and 512 symbols in different lengths of the synchronization information.

Fig. 12a and 12b show correlation results of the conventional scheme when the local synchronization sequence is 128 symbols and 512 symbols.

Fig. 12c and 12d show the correlation operation result between the received physical signal and the local synchronization information by preprocessing when the local synchronization sequence is 128 symbols and 512 symbols.

Fig. 12e and 12f show the correlation operation result between the received physical signal and the preprocessed local synchronization information when the local synchronization sequence is 128 symbols and 512 symbols.

From the comparison of fig. 12a, 12c and 12e, and fig. 12b, 12d and 12f, it can be seen that when the conventional scheme is adopted, the length of the required local synchronization information is greater than 512 symbols, whereas when the scheme of the embodiment of the present application is adopted, the length of the local synchronization information can be shortened to 128 symbols, and the correlation peak obtained by preprocessing the local synchronization information and then performing the correlation operation with the received physical signal is more obvious.

Fig. 13 is an apparatus for information synchronization according to an embodiment of the present application. As shown in fig. 13, the apparatus includes a receiving unit 1310 and a processing unit 1320.

A receiving unit 1310 configured to receive a first physical signal transmitted by an optical network unit ONU;

A processing unit 1320, configured to determine synchronization related information of the second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a lead code of the first physical signal;

the processing unit 1320 is further configured to, when the synchronization related information meets a preset threshold, the OLT determines that the second synchronization information is synchronized with the preprocessed first synchronization information.

In one embodiment, the processing unit 1320 pre-processes the first synchronization information, including:

a receiving unit 1310, further configured to receive a second physical signal sent by an ONU;

The processing unit 1320 determines training information in the second physical signal according to the second physical signal and the third synchronization information, where the training information is located in a preamble of the second physical signal;

the processing unit 1320 trains the training information to obtain the equalizer coefficient of the data signal processing DSP in the OLT;

the processing unit 1320 pre-processes the first synchronization information according to the equalizer coefficients;

In one embodiment, the processing unit 1320 is specifically configured to,

In one embodiment, the processing unit 1320 is further specifically configured to delay each symbol in the first synchronization information, multiply each delayed symbol by a corresponding equalizer coefficient, and accumulate and output the multiplied symbols to obtain the preprocessed first synchronization information.

In one embodiment, the pre-processed first synchronization information is pre-stored in a look-up table of the OLT.

In one embodiment, the lookup table includes the preprocessed first synchronization information and a query identifier corresponding to the preprocessed first synchronization information, where the query identifier is an identifier of an ONU that transmits the first physical signal.

In one embodiment, the first physical signal further includes a search identifier, and the search identifier is used by the OLT to search the preprocessed first synchronization information; the processing unit 1320 is further configured to, before the OLT determines synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, query the preprocessed first synchronization information from the lookup table according to the lookup identifier.

In one embodiment, the OLT determines synchronization related information of the second synchronization information and the preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, and includes:

The functions of the functional units in the apparatus may be implemented by the steps executed by the OLT in the embodiments shown in fig. 6 to fig. 9, and therefore, detailed working processes of the apparatus provided in the embodiments of the present application are not repeated herein.

As shown in fig. 13, a receiving unit 1310 of the apparatus is configured to receive a first physical signal sent by an optical network unit ONU;

In one embodiment, the receiving unit 1310 is further configured to receive a second physical signal sent by the ONU;

the processing unit 1320 is further configured to determine training information in the second physical signal according to the second physical signal and third synchronization information, where the training information is located in a preamble of the second physical signal, the third synchronization information is pre-stored in the OLT, and the third synchronization information includes the first synchronization information;

the processing unit 1320 is further configured to train the training information to obtain equalizer coefficients of the data signal processing DSP in the OLT.

In one embodiment, the receiving unit 1310 is also used for receiving a second physical signal sent by an ONU;

the processing unit 1320 is further configured to determine training information in the second physical signal according to the preprocessed second physical signal and the first synchronization information, where the training information is located in a preamble of the second physical signal, and the first synchronization information is pre-stored in the OLT;

In one embodiment, the processing unit 1320 pre-processes the first physical signal, including:

the processing unit 1320 preprocesses the physical signal according to the equalizer coefficients.

In one embodiment, the first physical signal further comprises training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; the processing unit 1320 preprocesses the first physical signal according to the equalizer coefficients, including:

In one embodiment, the processing unit 1320 is specifically configured to,

The functions of each functional unit in the apparatus may be implemented by steps executed by the OLT in the embodiments shown in fig. 10 and fig. 11, and therefore, detailed working processes of the apparatus provided in the embodiments of the present application are not repeated herein.

Fig. 14 is a device for synchronizing information according to an embodiment of the present disclosure, which includes a receiver 14101410 and a processor 14201420.

A receiver 1410, configured to receive a first physical signal sent by an optical network unit ONU;

a processor 1420, configured to determine synchronization related information of the second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a lead code of the first physical signal;

The processor 1420 is further configured to, when the synchronization related information meets a preset threshold, the OLT determines that the second synchronization information is synchronized with the preprocessed first synchronization information.

In one embodiment, processor 1420 preprocesses the first synchronization information, including:

a receiver 1410, configured to receive a second physical signal sent by the ONU;

the processor 1420 determines training information in the second physical signal according to the second physical signal and the third synchronization information, wherein the training information is located in a preamble of the second physical signal;

the processor 1420 trains the training information to obtain the equalizer coefficient of the data signal processing DSP in the OLT;

processor 1420 preprocesses the first synchronization information based on the equalizer coefficients;

Alternatively, in one embodiment, processor 1420 is specifically configured to,

In one embodiment, the processor 1420 is further configured to delay each symbol of the first synchronization information, multiply each delayed symbol with a corresponding equalizer coefficient, and accumulate and output the multiplied symbols to obtain the preprocessed first synchronization information.

In one embodiment, the first physical signal further includes a search identifier, and the search identifier is used by the OLT to search the preprocessed first synchronization information; the processor 1420 is further configured to, before the OLT determines synchronization related information of the second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information, query the preprocessed first synchronization information from the lookup table according to the lookup identifier.

In one embodiment, the apparatus further comprises a memory coupled to the processor and the receiver for storing instructions and data, such as local synchronization information. The processor is used to call instructions in the memory to perform the methods/steps described in fig. 6-9.

The functions of each functional device in the apparatus may be implemented by the steps executed by the OLT in the embodiments shown in fig. 6 to fig. 9, and therefore, detailed working processes of the apparatus provided in the embodiments of the present application are not repeated herein.

An embodiment of the present application further provides an information synchronization apparatus, as shown in fig. 14, the apparatus includes:

In one embodiment, the receiver 1410 is further configured to receive a second physical signal sent by the ONU;

the processor 1420 is further configured to determine training information in the second physical signal according to the second physical signal and third synchronization information, where the training information is located in a preamble of the second physical signal, the third synchronization information is pre-stored in the OLT, and the third synchronization information includes the first synchronization information;

the processor 1420 is further configured to train the training information to obtain equalizer coefficients of the data signal processing DSP in the OLT.

In one embodiment, the receiver 1410 is also used to receive a second physical signal sent by the ONU;

the processor 1420 is further configured to determine training information in the second physical signal according to the preprocessed second physical signal and the first synchronization information, where the training information is located in a preamble of the second physical signal, and the first synchronization information is pre-stored in the OLT;

In one embodiment, processor 1420 preprocesses the first physical signal, including:

processor 1420 preprocesses the physical signal according to the equalizer coefficients.

In one embodiment, the first physical signal further comprises training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; processor 1420 preprocesses the first physical signal according to the equalizer coefficients, including:

In one embodiment, processor 1420 is specifically configured to,

The functions of each functional device in the apparatus may be implemented by steps executed by the OLT in the embodiments shown in fig. 10 and fig. 11, and therefore, detailed working processes of the apparatus provided in the embodiments of the present application are not repeated herein.

Fig. 15 is a schematic structural diagram of another apparatus provided in the embodiment of the present application, where the apparatus includes a physical chip, a preprocessing module, and a DSP. The preprocessing module is used for preprocessing the first local synchronization information or preprocessing the received first physical signal. The DSP is used for carrying out convolution calculation on the preprocessed first synchronization information and the received first physical signal, or carrying out convolution calculation on the preprocessed first physical signal and the first synchronization information to obtain synchronization related information, further carrying out equalizer training, determining a delimiter and carrying out load equalization. The apparatus provided in fig. 15 can perform the method or steps of the embodiments shown in fig. 6 or fig. 10, and for brevity, the description is not repeated herein.

Embodiments of the present application provide a computer program product comprising instructions for performing the method/steps of fig. 6 or fig. 10 described above when the instructions are run on a computer.

Embodiments of the present application provide a computer-readable storage medium for storing instructions that, when executed on a computer, perform the method/steps of fig. 6 or fig. 10 described above.

In the various embodiments of the present application described above, all or part of the implementation may be implemented by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions can be stored on a computer readable storage medium or transmitted from one computer readable medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for synchronizing information, the method comprising:

the OLT determines synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; wherein the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a preamble of the first physical signal;

2. The method of claim 1, wherein the pre-processing the first synchronization information comprises:

The OLT receives a second physical signal sent by the ONU;

the OLT determines training information in the second physical signal according to the second physical signal and third synchronization information, wherein the training information is located in a lead code of the second physical signal;

the OLT trains the training information to obtain an equalizer coefficient of a data signal processing DSP in the OLT;

the third synchronization information is pre-stored in the OLT, and the third synchronization information includes the first synchronization information.

3. The method of claim 2, wherein the OLT determines training information in the second physical signal based on the second physical signal and third synchronization information, comprising:

4. A method according to claim 2 or 3, wherein the first synchronization information comprises a plurality of symbols; the preprocessing the first synchronization information according to the OLT equalizer coefficients includes:

and delaying each symbol in the first synchronization information, multiplying each delayed symbol by the corresponding equalizer coefficient respectively, and accumulating and outputting to obtain the preprocessed first synchronization information.

5. The method according to any of claims 1 to 4, wherein the pre-processed first synchronization information is pre-stored in a look-up table of the OLT.

6. The method of claim 5, wherein the lookup table comprises the preprocessed first synchronization information and a query identifier corresponding to the preprocessed first synchronization information, and wherein the query identifier is an identifier of an ONU transmitting the first physical signal.

7. The method according to claim 5 or 6, wherein the first physical signal further comprises a lookup identifier, and the lookup identifier is used by the OLT to lookup the preprocessed first synchronization information; before the OLT determines synchronization related information of second synchronization information and preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, the method further includes:

8. The method according to any of claims 1 to 7, wherein the OLT determines synchronization-related information of second synchronization information and pre-processed first synchronization information in the first physical signal according to the first physical signal and the pre-processed first synchronization information, and comprises:

9. A method for synchronizing information, the method comprising:

the OLT determines synchronization related information of second synchronization information and first synchronization information included in the preprocessed first physical signal according to the preprocessed first physical signal and the preprocessed first synchronization information; wherein the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a preamble of the first physical signal;

And when the synchronization related information meets a preset threshold, the OLT determines that second synchronization information included in the preprocessed first physical signal is synchronized with the first synchronization information.

10. The method according to claim 9, wherein before the optical line termination OLT receives the first physical signal sent by the optical network unit ONU, the method further comprises:

the OLT receives a second physical signal sent by the ONU;

the OLT determines training information in the second physical signal according to the second physical signal and third synchronization information, wherein the training information is located in a lead code of the second physical signal, the third synchronization information is prestored in the OLT, and the third synchronization information comprises the first synchronization information;

and the OLT trains the training information to obtain an equalizer coefficient of a data signal processing DSP in the OLT.

11. The method according to claim 9, wherein before the optical line termination OLT receives the first physical signal sent by the optical network unit ONU, the method further comprises:

the OLT receives a second physical signal sent by the ONU;

the OLT determines training information in the second physical signal according to the preprocessed second physical signal and first synchronization information, wherein the training information is located in a lead code of the second physical signal, and the first synchronization information is prestored in the OLT;

12. The method of claim 10 or 11, wherein pre-processing the first physical signal comprises:

the OLT pre-processes the physical signal according to the equalizer coefficient.

13. The method of claim 12, wherein the first physical signal further comprises training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; the OLT pre-processes the first physical signal according to the equalizer coefficient, including:

delaying each symbol of the second synchronization information in the first physical signal and the training information in the first physical signal, multiplying each delayed symbol by the corresponding equalizer coefficient, and accumulating and outputting to obtain the preprocessed first physical signal.

14. The method according to any of claims 9 to 13, wherein the determining, by the OLT, synchronization related information of second synchronization information and first synchronization information included in the preprocessed first physical signal according to the preprocessed first physical signal and the first synchronization information comprises:

15. An apparatus for synchronizing information, the apparatus comprising:

the processor is used for determining synchronization related information of second synchronization information in the first physical signal and the preprocessed first synchronization information according to the first physical signal and the preprocessed first synchronization information; wherein the first synchronization information is pre-stored in the OLT, and the second synchronization information is located in a preamble of the first physical signal;

the processor is further configured to determine, by the OLT, that the second synchronization information is synchronized with the preprocessed first synchronization information when the synchronization related information satisfies a preset threshold.

16. The apparatus of claim 15, wherein the processor pre-processes the first synchronization information, comprising:

the receiver is further configured to receive a second physical signal sent by the ONU;

The processor determines training information in the second physical signal according to the second physical signal and third synchronization information, wherein the training information is located in a lead code of the second physical signal;

the processor trains the training information to obtain an equalizer coefficient of a data signal processing DSP in the OLT;

the processor preprocesses the first synchronization information according to the equalizer coefficients;

17. The apparatus of claim 16, wherein the processor is specifically configured to,

determining fourth synchronization information in the second physical signal and synchronization related information of the third synchronization information according to the second physical signal and the third synchronization information, wherein the fourth synchronization information is located in a preamble of the second physical signal;

18. The apparatus of claim 16 or 17, wherein the first synchronization information comprises a plurality of symbols; the processor is further specifically configured to delay each symbol in the first synchronization information, multiply each delayed symbol by the corresponding equalizer coefficient, and accumulate and output the multiplied symbols to obtain the preprocessed first synchronization information.

19. The apparatus of any of claims 15 to 18, wherein the pre-processed first synchronization information is pre-stored in a look-up table of the OLT.

20. The apparatus of claim 19, wherein the lookup table comprises the preprocessed first synchronization information and a query identifier corresponding to the preprocessed first synchronization information, and wherein the query identifier is an identifier of an ONU that transmits the first physical signal.

21. The apparatus according to claim 5 or 6, wherein the first physical signal further comprises a lookup identifier, and the lookup identifier is used by the OLT to lookup the preprocessed first synchronization information; the processor is further configured to, before the OLT determines synchronization related information of second synchronization information and preprocessed first synchronization information in the first physical signal according to the first physical signal and the preprocessed first synchronization information, query the preprocessed first synchronization information from the lookup table according to the lookup identifier.

22. The apparatus according to any of the claims 15 to 21, wherein the OLT determines synchronization related information of the second synchronization information and the pre-processed first synchronization information in the first physical signal according to the first physical signal and the pre-processed first synchronization information, comprising:

23. An apparatus for synchronizing information, the apparatus comprising:

24. The apparatus of claim 23,

the processor is further configured to determine training information in the second physical signal according to the second physical signal and third synchronization information, where the training information is located in a preamble of the second physical signal, the third synchronization information is pre-stored in the OLT, and the third synchronization information includes the first synchronization information;

The processor is further configured to train the training information to obtain an equalizer coefficient of a data signal processing DSP in the OLT.

25. The apparatus of claim 23,

the processor is further configured to determine training information in the second physical signal according to the second physical signal and the first synchronization information that are preprocessed, where the training information is located in a preamble of the second physical signal, and the first synchronization information is prestored in the OLT;

26. The apparatus of claim 24 or 25, wherein the processor pre-processes the first physical signal, comprising:

the processor pre-processes the physical signal according to the equalizer coefficients.

27. The apparatus of claim 26, wherein the first physical signal further comprises training information; the second synchronization information in the first physical signal and the training information in the first physical signal respectively comprise a plurality of symbols; the processor pre-processes the first physical signal according to the equalizer coefficients, including:

28. The apparatus according to any of the claims 23 to 27, wherein the processor is specifically configured to,