CN101383659B - Device and method for automatically debugging parameters of communication system - Google Patents

Abstract

The invention provides a device and a method for automatically debugging parameters of a communication system, wherein the device comprises: a debug object selection unit to: selecting a receiver and/or a transmitter of the communication system as an object to be debugged, and selecting the current debugging parameters of the object to be debugged; an error signal acquisition unit for: acquiring an error signal and transmitting the error signal to an error signal analysis unit; an error signal analysis unit for: analyzing the error signal, judging whether the current debugging parameter needs to be adjusted according to an analysis result, and transmitting adjustment information recorded with an adjustment direction to an adjustment unit if the current debugging parameter needs to be adjusted; an adjustment unit for: and adjusting the current debugging parameters according to the adjusting information. The invention can improve the debugging efficiency and the debugging precision of the parameters of the transmitter and the receiver of the digital communication system, and realize automatic debugging and accurate calibration.

Description

A device and method for automatically debugging parameters of a communication system

technical field

The invention relates to the technical field of digital communication, in particular to an automatic debugging device and method for an optical communication system transmitter and receiver.

Background technique

In a digital communication system, the parameters of the transmitter and receiver are important factors that affect system performance. These parameters include the cross point of the transmitter's eye diagram, the driving amplitude, the Von level of the EA (electro-absorption, electrical absorption) modulated laser, Receiver decision level, APD (Avalanche Photodiode, avalanche photodiode) receiver bias, etc. The parameters of the transmitter and the parameters of the receiver influence each other. When the parameters of the transmitter change, the parameters of the receiver also need to be adjusted accordingly to ensure the best transmission performance of the system. At the same time, for different application environments, due to the influence of factors such as noise generated by the optical amplifier in the transmission system, fiber dispersion, and fiber nonlinear effects, the settings of the transmitter and receiver parameters also need to be adjusted accordingly. The mutual influence and restriction among receiver parameters, when debugging the transmitter or receiver, it is very difficult and complicated to accurately adjust the parameters of the transmitter and receiver to the optimal value. And it is very important to choose an efficient and accurate debugging calibration.

The usual debugging process is to set the parameters of the transmitter and receiver to a fixed empirical value. Due to the discreteness of the device and the difference in the application environment and other factors, such a debugging method cannot guarantee that the set parameters are optimal. . Therefore, the present invention proposes a device and method for automatically adjusting and calibrating transmitter and receiver parameters.

Contents of the invention

The problem to be solved by the present invention is to provide a device and method for automatically debugging the parameters of the communication system, which can improve the debugging efficiency and debugging accuracy of the transmitter and receiver parameters of the digital communication system, and realize automatic debugging and accurate calibration. Solve the technical problem that it is difficult to accurately adjust the parameters of the transmitter and receiver to the optimal value in the prior art.

In order to achieve the above object, on the one hand, a device for automatically adjusting parameters of a communication system is provided, a transmission environment is established between a receiver and a transmitter of the communication system, and the device includes:

The debugging object selection unit is used to: select the receiver and/or transmitter of the communication system as the object to be debugged, and select the current debugging parameters of the object to be debugged;

An error signal acquisition unit, configured to: acquire information capable of characterizing the transmission performance of the communication system as an error signal, and transmit the error signal to an error signal analysis unit;

An error signal analysis unit, configured to: analyze the error signal, judge whether the current debugging parameters need to be adjusted according to the analysis result, and transmit the adjustment information recording the adjustment direction to the adjustment unit if adjustment is required;

An adjustment unit, configured to: adjust the current debugging parameter according to the adjustment information.

Preferably, in the above device, the adjustment unit further includes:

A step adjustment unit, configured to: determine the adjustment step of the current debugging parameter, the adjustment step is a stored predetermined step for adjusting the current debugging parameter, or the adjustment step is based on the error signal a step size calculated from said analysis result of the analysis unit;

A parameter adjustment unit, configured to: adjust the current debugging parameter according to the adjustment direction and the adjustment step.

Preferably, the above device further includes: a transmission environment unit, configured to: establish the transmission environment according to the application environments of the receiver and the transmitter.

Preferably, in the above-mentioned device, the debugging object selection unit is further configured to cyclically select various parameters of the transmitter and the receiver as the current debugging parameters, and realize the cyclic order of the cyclic, Control of cycle mode and cycle times.

Preferably, in the above device, the various parameters include: the driving amplitude of the transmitter, the cross point of the eye diagram of the transmitter, and the decision level of the receiver.

One aspect of the present invention provides a method for automatically debugging parameters of a communication system, where a transmission environment is established between a receiver and a transmitter of the communication system, and the method includes:

Step 1, the parameter adjustment unit sets the initial values of the transmitter parameters and the receiver parameters;

Step 2, the error signal analysis unit judges whether the conditions for completion of debugging are met, if yes, end the debugging process, if not, continue to step 3;

Step 3, the debugging object selection unit selects a current debugging parameter;

Step 4, the error signal acquisition unit acquires information capable of characterizing the transmission performance of the communication system as an error signal;

Step 5, the error signal analysis unit analyzes the error signal, and judges whether the current debugging parameters need to be adjusted according to the error signal analysis result, if yes, execute step 6, otherwise return to step 2;

Step 6, the adjustment unit adjusts the current debugging parameters according to the analysis result of the error signal.

Preferably, in the above method, said step six further includes:

In step a, the error signal analysis unit analyzes the error signal to obtain an adjustment direction in which the current debugging parameters need to be adjusted;

Step b, the step adjustment unit in the adjustment unit determines the adjustment step of the current debugging parameter, the adjustment step is a stored predetermined step for adjusting the current debugging parameter, or the adjustment step is The step size calculated according to the analysis result of the error signal;

Step c, the parameter adjustment unit in the adjustment unit adjusts the current debugging parameters according to the adjustment direction and the adjustment step;

Step d, return to step 4 after adjusting the current debugging parameters.

Preferably, in the above method, the initial value is a set of empirical values.

Preferably, in the above method, the step three specifically includes: the debugging object selection unit cyclically selects various parameters of the transmitter and the receiver as the current debugging parameters, and implements the cycle Control of cycle sequence, cycle mode and cycle times.

Preferably, in the above method, the various parameters include: the driving amplitude of the transmitter, the cross point of the eye diagram of the transmitter and the decision level of the receiver.

Embodiments of the present invention at least have the following technical effects:

Using the method and device of the present invention, compared with the prior art, due to the adoption of the technology of automatically debugging and calibrating the parameters of the digital communication system transmitter and receiver, the accuracy of the transmitter and receiver parameter settings is guaranteed, and the Improve debugging efficiency, ensure debugging performance, and improve performance indicators such as system signal-to-noise ratio and receiving sensitivity.

Description of drawings

Fig. 1 is the structural diagram of the device provided by the present invention;

Fig. 2 is the flowchart of the method provided by the present invention;

Fig. 3 is a structural diagram of a device provided by another embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, specific embodiments will be described in detail below with reference to the accompanying drawings.

The embodiment of the present invention proposes a device and method capable of automatically debugging and calibrating transmitter parameters and receiver parameters, which can improve the debugging efficiency and debugging accuracy of transmitter and receiver parameters in a digital communication system, and realize automatic debugging and accurate calibration.

Fig. 1 is a structural diagram of the device provided by the present invention. As shown in Fig. 1, the debugging object 200 of the device 100 of the present invention includes: a transmitter and a receiver, and the parameters of the transmitter and the receiver can be debugged and calibrated simultaneously, or Use a debug-calibrated transmitter or receiver as a reference, and only the other is debug-calibrated.

A transmission environment 300 is established between the transmitter and the receiver, and the transmission environment 300 can be established by the transmission environment unit according to the application environment of the object to be debugged, so that the transmission environment is similar to the application environment and the debugging accuracy is improved.

As shown in Figure 1, the device for automatically debugging the parameters of the communication system of the present invention includes:

Error signal acquisition unit 101: acquire information capable of characterizing the transmission performance of the system as an error signal, and transmit the acquired error signal to the error analysis unit 102;

Error signal analysis unit 102: analyze the information obtained by the error acquisition unit, determine whether the current adjustment parameter needs to be adjusted, if necessary, analyze and determine the direction to be adjusted, and transmit the relevant information to the step adjustment unit 104;

Debugging object selection unit 103: Due to the mutual influence of transmitter and receiver parameters, various parameters need to be cyclically adjusted, and the debugging object selection unit can realize the control of the cycle sequence, mode, number of times, etc.;

Step size adjustment unit 104: store the predetermined adjustment step size of the transmitter and receiver parameters or calculate the adjustment step size of the transmitter and receiver parameters according to the analysis results of the error signal analysis unit, and determine the adjustment direction according to the error signal analysis unit The information is transmitted to the debugging parameter setting unit together;

The parameter adjustment unit 105: adjusts the parameter selected by the debugging object selection unit according to the adjustment direction and the adjustment step transmitted by the step adjustment unit.

Wherein, the communication system may be a digital communication system, an optical communication system, and the like.

The embodiment of the present invention also provides a method for automatically debugging and calibrating transmitter and receiver parameters in a digital communication system. FIG. 2 is a flowchart of the method, including:

The first step 51 is to set the initial values of the transmitter and receiver parameters, and the initial value setting can be a set of empirical values.

In the second step 52, it is judged whether the condition for completion of the debugging is met, if it is met, the debugging process is ended, if not, the third step 53 is continued;

In the third step 53, a current debugging parameter is selected;

The fourth step 54 is to obtain information that can characterize the transmission performance of the system as an error signal;

The fifth step 55 is to analyze the error signal;

The sixth step 56 is to judge whether the parameters to be debugged need to be adjusted, and if no adjustment is required, return to the second step 52;

In the seventh step 57, if necessary, adjust the current parameter to be debugged according to the error signal analysis result.

The seventh step includes:

Step 571, analyzing the error signal to obtain the direction in which the current parameters to be debugged need to be adjusted;

Step 572, analyze the error signal, and calculate the adjustment step size of the current parameter to be debugged, or use the stored predetermined adjustment step size;

Step 573 , according to the analysis results of steps 571 and 572 , adjust the current parameters to be debugged; return to the fourth step 54 after adjusting the current parameters to be debugged, and obtain the error signal again.

The following description will be made in conjunction with specific transmitting devices (transmitters) and receiving devices (receivers). In this embodiment, both the transmitter and the receiver are used as debugging objects. The parameters that need to be debugged are the driving amplitude of the transmitter, the eye cross point, and the decision level of the receiver as examples. Other parameters are added or deleted, or only for The method of debugging one of the transmitter or the receiver is similar, only need to adjust the control methods such as the debugging sequence and times in the debugging object selection unit. The transmission environment in the embodiment takes 8×80 km transmission and full dispersion compensation as an example, and different transmission environments can be configured for other application environments. In this embodiment, the error correction information provided by the forward error correction unit is used as the error information for parameter debugging.

The specific implementation is described in detail below:

Fig. 3 is a structural block diagram of the present embodiment, including the following parts:

Transmitting device 610 , receiving device 620 , transmission environment 630 , forward error correction 640 and microprocessor 650 .

The transmitting device includes a driver, a laser integrated with an EA modulator, a drive amplitude adjustment unit and an eye diagram intersection adjustment unit. in:

Driver: amplifies and shapes the electrical signal to a suitable amplitude and outputs it to the modulator;

Laser with integrated EA modulator: Receive the electrical signal given by the driver and complete the conversion from electrical signal to optical signal;

Driving amplitude adjustment unit: set the output signal amplitude of the driver, receive the adjustment signal given by the microprocessor, and control and adjust the driving amplitude of the driver after digital-to-analog conversion;

Eye diagram cross point adjustment unit: set the position of the transmitter eye diagram cross point, receive the adjustment signal given by the microprocessor, and control and adjust the eye diagram cross point of the transmitting device after digital-to-analog conversion.

The receiving device includes a photodetector, a transimpedance amplifier, a limiting amplifier, a judgment/data clock recovery, and judgment level adjustment, among which:

Photodetector: Complete the conversion of optical signal and electrical signal. Typically a photodiode or an avalanche photodiode. The size of the output photogenerated current is proportional to the average light power;

Transimpedance amplifier: linearly amplify the weak electrical signal output by the photodetector, including traditional transimpedance amplifiers and voltage amplifiers;

Limiting amplifier: limit and amplify the signal output by the transimpedance amplifier, with or without automatic gain control;

Judgment/clock data recovery unit: including filter, data and clock recovery, judgment, demultiplexer and other functional modules;

Judgment level adjustment unit: receives the adjustment signal given by the microprocessor, controls and adjusts the judgment level of the receiving device after digital-to-analog conversion.

Transmission environment: 8 sections of 80km transmission, each of which has undergone dispersion compensation and EDFA power amplification.

Forward error correction unit: completes the forward error correction function and reports the error correction information to the microprocessor.

Microprocessor: query the error correction information of the forward error correction unit, perform analysis and calculation, and control and adjust each parameter to be adjusted.

Its working process is as follows:

The optical signal output by the transmitting device enters the receiving device after transmission, the input optical signal is converted into a weak electrical signal by the photodetector, and then the pre-amplification is completed through the transimpedance amplifier, and the amplification, filtering and processing are completed through the linear channel and the data recovery unit. The data is recovered, and finally enters the forward error correction unit to complete the detection and correction of transmission errors. At the same time, the error correction information output by the forward error correction unit is controlled by the microprocessor to adjust the cross point of the eye diagram of the transmitting device. In this embodiment, the error correction information provided by the forward error correction unit is used as the error information for optimal adjustment of the eye diagram intersection, so the forward error correction unit is equivalent to the error signal acquisition unit in the block diagram of the device; the microprocessor is used to Analyze and calculate the error correction information given by the forward error correction unit, and output the parameter adjustment information to the drive amplitude adjustment unit in the sending device, the eye cross point adjustment unit or the decision level adjustment unit in the receiving device, which is equivalent to An error signal analysis unit and a step size adjustment unit in the block diagram of the device.

Take the adjustment of the intersection of the eye diagram as an example: in the forward error correction system, when the sum E of the number of corrected 1s and the number of corrected 0s in the error correction information is the smallest, the system bit error rate is the smallest and the transmission performance is optimal , so this information E can be used as the judgment basis for adjusting the eye cross point. Take a fixed minimum step size h, set the initial eye diagram intersection value to X=a, compare the error correction information given by the forward error correction system when X=a and X=a+h, if EX=a>EX=a +h, then X=a+h, otherwise X=a-h. Then judge again at the new X position until E=0, or the E value at the current eye cross point position is the smallest, or stop when the number of adjustments is greater than N, it is considered that the adjustment of the eye cross point has been completed this time . Select other parameters to be adjusted through the microprocessor, and adjust according to the same process. Since the parameters of the transmitter and receiver affect each other, the adjustment of the parameters requires several cycles. Considering that the decision level is sensitive to changes in both the driving amplitude and the eye diagram crossing point, the cycle sequence adopted in our embodiment is driving amplitude --> judgment level --> eye diagram crossing point --> decision voltage Ping --> Drive amplitude..., in other environments or other parameters to be adjusted, different cycle sequences can be set according to actual conditions. After all the parameters are adjusted to the optimal value, or the transmission performance meets the requirements, or the number of cycles reaches the upper limit M, the debugging process is considered to be over.

As can be seen from the above, using the method and device of the present invention, compared with the prior art, due to the adoption of the technology of automatically debugging and calibrating the digital communication system transmitter and receiver parameters, the transmitter and receiver parameter settings are guaranteed. The accuracy improves the debugging efficiency, ensures the debugging performance, and improves the system signal-to-noise ratio and receiving sensitivity and other performance indicators.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (8)

1. the device that the parameter of communication system is debugged automatically establishes transmission environment between the Receiver And Transmitter of said communication system, it is characterized in that, said device comprises:

The debugger object selected cell is used for: select the receiver of said communication system and/or transmitter conduct to treat debugger object, and select the said current tuning parameter of treating debugger object;

The error signal acquiring unit is used for: the information of obtaining the transmission performance that can characterize said communication system is as error signal, and said error signal is transferred to the error signal analytic unit;

The error signal analytic unit is used for: analyze said error signal, judge whether that according to analysis result needs adjust said current tuning parameter, the adjustment adjustment information that then will record the adjustment direction transfers to adjustment unit if desired;

Adjustment unit is used for: adjust said current tuning parameter according to said adjustment information;

Said adjustment unit further comprises:

The step-length adjustment unit; Be used for: the adjustment step-length of confirming said current tuning parameter; Said adjustment step-length is the predetermined step-length of the said current tuning parameter of adjustment of storage, the step-length that perhaps said adjustment step-length calculates for the said analysis result according to said error signal analytic unit;

The parameter adjustment unit is used for: according to said adjustment direction and said adjustment step-length said current tuning parameter is adjusted.

2. device according to claim 1 is characterized in that, also comprises:

The transmission environment unit is used for: according to the applied environment of said receiver and said transmitter, set up said transmission environment.

3. device according to claim 1; It is characterized in that; Said debugger object selected cell also is used for, and the various parameters of said transmitter of Cyclic Selection and said receiver are as said current tuning parameter, and realization is to the control of circular order, endless form and the cycle-index of said circulation.

4. device according to claim 3 is characterized in that, said various parameters comprise: the eye pattern crosspoint of the driven amplitude of transmitter, transmitter and the decision level of receiver.

5. the method that the parameter of communication system is debugged automatically establishes transmission environment between the Receiver And Transmitter of said communication system, it is characterized in that, said method comprises:

Step 1, the parameter adjustment unit is provided with the initial value of transmitter parameter and receiver parameters;

Step 2, error signal analytic unit judge whether to meet the condition that debugging is accomplished, if meet, finish the debugging flow process, if do not meet, proceed step 3;

Step 3, the debugger object selected cell is selected a current tuning parameter;

Step 4, error signal acquiring unit are obtained the information of the transmission performance that can characterize said communication system as error signal;

Step 5, said error signal analytic unit is analyzed said error signal, judges whether that according to the error signal analysis result needs adjust said current tuning parameter, is execution in step six then, otherwise returns step 2;

Step 6, adjustment unit is adjusted said current tuning parameter according to said error signal analysis result;

Said step 6 further comprises:

Step a, said error signal analytic unit is analyzed said error signal, draws the adjustment direction that said current tuning parameter need be adjusted;

Step b; Step-length adjustment unit in the said adjustment unit is confirmed the adjustment step-length of said current tuning parameter; Said adjustment step-length is the predetermined step-length of the said current tuning parameter of adjustment of storage, the step-length of perhaps said adjustment step-length for calculating according to said error signal analysis result;

Step c, the parameter adjustment unit in the said adjustment unit is adjusted said current tuning parameter according to said adjustment direction and said adjustment step-length;

Steps d is returned step 4 after adjusting said current tuning parameter.

6. method according to claim 5 is characterized in that, said initial value is one group of empirical value.

7. method according to claim 5; It is characterized in that; Said step 3 specifically comprises: the various parameters of said said transmitter of debugger object selected cell Cyclic Selection and said receiver are as said current tuning parameter, and realization is to the control of circular order, endless form and the cycle-index of said circulation.

8. method according to claim 7 is characterized in that, said various parameters comprise: the eye pattern crosspoint of the driven amplitude of transmitter, transmitter and the decision level of receiver.

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