CN107317603B - Power line communication method and system and power line communication terminal - Google Patents
Power line communication method and system and power line communication terminal Download PDFInfo
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- CN107317603B CN107317603B CN201710533141.3A CN201710533141A CN107317603B CN 107317603 B CN107317603 B CN 107317603B CN 201710533141 A CN201710533141 A CN 201710533141A CN 107317603 B CN107317603 B CN 107317603B
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Abstract
The application discloses a method for power line communication, which comprises the following steps: exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and performing power grid channel detection according to an appointed channel detection waveform sequence after the exchange is finished; exchanging parameters corresponding to reliable communication according to a communication modulation mode and a communication protocol according to a power grid channel detection result; reconstructing a signal processing circuit according to the parameters; performing communication through the reconstructed signal processing circuit; the method ensures reliable communication between two communication parties by reconstructing a signal processing circuit to use a signal scheme and a modulation and demodulation technology which are most suitable for the current power line channel condition; the application also discloses a system and a terminal for power line communication, which have the beneficial effects.
Description
Technical Field
The present disclosure relates to the field of power line carrier communication technologies, and in particular, to a method and a system for power line communication, and a power line communication terminal.
Background
The power line carrier communication technology has been studied for decades and is first applied to meet the communication requirements for scheduling and monitoring of important nodes of power grids such as power transmission main lines and power distribution stations. With the development of the intelligent power grid technology, the power line carrier communication technology is also applied to the field of automatic meter reading. Generally, power line carrier communication is divided into three frequency ranges of ultra-narrow band (0.3-3kHz), narrow band (3-500kHz) and wide band (1.8-250MHz), and can realize communication rates from 100bps,500Kbps and hundreds of megabits per second, and transmission distances are 150Km, kilometers and tens of meters respectively. Related international organizations such as IEEE and ITU have established corresponding standards for power line carrier communication, such as IEEE P1901, ITU g.hn and Home Plug, and the power industry of China has also established corresponding industry standards, but the adopted technologies are all relatively simple technologies and have relatively poor effects. Although the related international standard products operate well on foreign high-quality power grids, once the international standard products are applied to domestic power grids in China, the effect is not satisfactory. The reasons are that the complexity of the domestic power grid is far higher than that of the foreign power grid, the inherent random, time-varying and severe load change of the power grid channel, various kinds of burst interference exist, and the communication quality of the system is highly dependent on the positions of the transmitting and receiving parties. The existing fixed communication signal design and modulation mode are difficult to meet the reliable communication requirement on a complex power grid communication channel, and a new self-adaptive solution must be provided. When a new and feasible technical scheme is proposed, the device is required to be capable of supporting reconfigurable and updating the embedded code at low cost. However, the power line carrier communication products in the domestic market all adopt the solution of the application specific integrated circuit chip, so that the power line carrier communication products do not have flexibility, and cannot reconstruct and upgrade software codes along with the upgrading of the technology, thereby protecting the great investment of the existing circuit equipment. The techniques and methods of the present invention are directed to solving the above-mentioned problems.
Disclosure of Invention
The purpose of the present application is to provide a method, a system and a power line communication terminal for power line communication, which ensure reliable communication between two communication parties by reconstructing a signal processing circuit to use a signal scheme and a modulation and demodulation technique most suitable for the current power line channel condition.
In order to solve the above technical problem, the present application provides a method for power line communication, where the method includes:
exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and performing power grid channel detection according to an appointed channel detection waveform sequence after the exchange is finished;
exchanging parameters corresponding to reliable communication according to the communication modulation mode and the communication protocol according to the power grid channel detection result;
reconstructing a signal processing circuit from the parameters;
and carrying out communication through the reconstructed signal processing circuit.
Optionally, after performing communication by the reconstructed signal processing circuit, the method further includes:
monitoring communication quality according to a predetermined period;
and when the communication quality is smaller than a set threshold value, executing the step of exchanging key parameters required by the power grid channel detection of the two communication parties according to a preset communication modulation mode and a preset communication protocol.
Optionally, the monitoring the communication quality according to the predetermined period includes:
the communication quality is monitored by using the error control coding at a predetermined period.
Optionally, the exchanging key parameters required for detecting the power grid channels of the two communication parties according to a preset communication modulation mode and a preset communication protocol includes:
and the communication initiator equipment exchanges key parameters required by the power grid channel detection of the two communication parties by using the ultra-low frequency band according to a preset communication modulation mode and a preset communication protocol.
Optionally, the performing, after the exchanging is completed, the power grid channel detection according to the agreed channel detection waveform sequence includes:
and after the exchange is finished, the low frequency band or the high frequency band is utilized to carry out power grid channel detection according to the appointed channel detection waveform sequence.
The present application further provides a system for power line communication, including:
the detection module is used for exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol and carrying out power grid channel detection according to an appointed channel detection waveform sequence after the exchange is finished; exchanging parameters corresponding to reliable communication according to the communication modulation mode and the communication protocol according to the power grid channel detection result;
a reconstruction module for reconstructing the signal processing circuit according to the parameters;
and the communication module is used for carrying out communication through the reconstructed signal processing circuit.
Optionally, the scheme further includes:
and the monitoring module is used for monitoring the communication quality according to a preset period.
Optionally, the monitoring module is specifically configured to monitor the communication quality by using an error control code according to a predetermined period; and when the communication quality is less than a set threshold value, executing the module of the detection module.
The present application also provides a power line communication terminal, including:
a memory for storing a computer program;
the reconstruction processor is used for exchanging key parameters required by the power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol according to the computer program in the memory, and carrying out the power grid channel detection according to an agreed channel detection waveform sequence after the exchange is finished; exchanging parameters corresponding to reliable communication according to the communication modulation mode and the communication protocol according to the power grid channel detection result; reconstructing a signal processing circuit from the parameters; and carrying out communication through the reconstructed signal processing circuit.
Optionally, the scheme further includes:
and the wireless communication equipment is used for communicating with the outside.
The method for power line communication provided by the application comprises the following steps: exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and performing power grid channel detection according to an appointed channel detection waveform sequence after the exchange is finished; exchanging parameters corresponding to reliable communication according to a communication modulation mode and a communication protocol according to a power grid channel detection result; reconstructing a signal processing circuit according to the parameters; and carrying out communication through the reconstructed signal processing circuit.
Therefore, the method determines parameters corresponding to reliable communication through power grid channel detection, so as to reconstruct a signal processing circuit, and ensure the reliable communication of two communication parties by using a signal scheme and a modulation and demodulation technology which are most suitable for the current power line channel condition; the application also provides a system and a terminal for power line communication, which have the beneficial effects and are not repeated herein.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of a method for power line communication according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of a specific method for power line communication according to an embodiment of the present disclosure;
fig. 3 is a block diagram of a system for power line communication according to an embodiment of the present disclosure;
fig. 4 is a block diagram of a power line communication terminal according to an embodiment of the present disclosure;
fig. 5 is a block diagram of another power line communication terminal according to an embodiment of the present disclosure.
Detailed Description
The core of the application is to provide a method, a system and a power line communication terminal for power line communication, which ensure reliable communication between two communication parties by reconstructing a signal processing circuit to use a signal scheme and a modulation and demodulation technology which are most suitable for the current power line channel condition.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for power line communication according to an embodiment of the present disclosure; the method can comprise the following steps:
s100, exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and performing power grid channel detection according to an agreed channel detection waveform sequence after the exchange is completed.
Specifically, the present embodiment does not limit the specific communication modulation scheme and communication protocol (in order to determine the frame structure of communication and the content of each field, such as length, coding, and meaning). The user can select the method according to actual conditions. For example, the communication modulation method may be FSK (Frequency-shift modulation). The present embodiment also does not limit the specific content of the key parameter, and may include, for example, the order of modulation mode conversion, the waveform sequence number, and the like, which are agreed in the rule and mode of power grid channel detection.
After the exchange of key parameters is completed, the communication parties can perform channel detection according to the channel detection waveform sequence agreed by the two parties. Specifically, the communication field generally uses pilots for channel sounding. In the embodiment, because the condition of the current power grid channel cannot be known, the channel detection waveforms supported by the system can be tested once; the setting of a particular channel sounding waveform sequence may be determined at the time of initial exchange of information. That is, the present embodiment does not limit the specific channel sounding waveform sequence.
In this embodiment, when exchanging the key parameters, the communication initiator device may use the ultra-low frequency band to exchange the key parameters required for detecting the power grid channels of both communication parties according to a preset communication modulation method and a preset communication protocol. The power grid channel detection can be carried out by using a low frequency band or a high frequency band during power grid channel detection, namely, the power grid channel detection is carried out by using the low frequency band or the high frequency band after the exchange is finished according to an appointed channel detection waveform sequence.
For example, in the step, the communication initiator first uses the ultra-low frequency band (i.e. 0.3-3KHz band) to exchange key parameters required for detecting the grid channel between two communication parties in a predetermined communication modulation mode (e.g. FSK) and a communication protocol (e.g. first use the low frequency band (3-500KHz) or the high frequency band (1.8-250MHz), the order of the modulation mode conversion, the waveform sequence number, etc.). After the key parameter exchange is completed, both parties can use the low frequency band or the high frequency band to perform channel detection according to the channel detection waveform sequence agreed by both parties.
And S110, exchanging parameters corresponding to reliable communication according to the power grid channel detection result and a communication modulation mode and a communication protocol.
Specifically, the step may determine the parameter corresponding to reliable communication according to the grid channel detection result. From which the required signal processing circuitry can be determined. The step can be carried out by using an ultra-low frequency band when exchanging the parameters corresponding to the reliable communication, namely, the two parties exchange the parameters capable of reliably communicating between the two parties through the ultra-low frequency band in a predetermined communication modulation mode and a communication protocol after finishing channel detection. Thereby determining the signal scheme and modem technique that best suits the current power line channel conditions. And correspondingly selecting a corresponding signal processing circuit for reconstruction, so that the two communication parties can communicate by using a signal scheme most suitable for the current power line channel condition, and the reliable communication of the two communication parties is ensured.
And S120, reconstructing a signal processing circuit according to the parameters.
Specifically, the step is to reconstruct the signal processing circuit according to the parameters acquired by the grid channel detection, so as to ensure reliable communication between two communication parties by using a signal scheme and a modulation and demodulation technology which are most suitable for the current power line channel condition. That is, since both parties know the modulation scheme and the information they send, if the receiving end does not receive the correct known information, the channel condition can be determined from the received signal. Because both sides have finished the exchange of the channel detection result information, so can adopt both sides' definite frequency band and modulation mode to communicate according to the result of exchange. The present embodiment does not limit the reconstruction method, and for example, the stored codes of the corresponding signal processing circuits may be acquired and written to a field programmable gate array (FGPA), that is, the acquired codes of the signal processing circuits that need to be reconstructed may be used to configure the FGPA. Or dynamic reconfiguration of the circuit or function can be realized by running corresponding codes by using the DSP. Namely, part of FGPA can be utilized to be dynamically configured; and the reconfiguration of the internal circuit can be completed by reloading the configuration codes of the FPGA under the control of an external controller. For example, based on the detection result, a signal chain processing circuit inside the field programmable gate array is reconstructed, so that the medium-high speed communication can be carried out by optimally utilizing the power grid channel between the two communication parties at present.
And S130, communication is carried out through the reconstructed signal processing circuit.
Specifically, the step is to perform medium-high speed communication by using the reconstructed signal processing circuit. In the middle-high speed communication stage, both communication parties carry out middle-speed or high-speed communication in a signal mode finally determined by both communication parties through a reconstructed signal processing circuit. Thereby ensuring reliable communication between the two communicating parties.
Based on the technical scheme, the method for power line communication provided by the embodiment of the application determines the parameters corresponding to reliable communication through power grid channel detection, so that the signal processing circuit is reconstructed, and the reliable communication of two communication parties is ensured by using the signal scheme and the modulation and demodulation technology which are most suitable for the current power line channel condition.
Based on the foregoing embodiment, in order to ensure that both communication parties can reliably communicate in the whole communication process, after performing communication through the reconstructed signal processing circuit, the embodiment may further include:
monitoring communication quality according to a predetermined period;
and when the communication quality is smaller than the set threshold, executing the step of exchanging key parameters required by the power grid channel detection of the two communication parties according to a preset communication modulation mode and a preset communication protocol.
Specifically, when the communication quality is reduced to a predetermined degree during the communication process, the communication initiator starts the channel detection process again and reconstructs the relevant signal processing circuit, and the process is repeated until the communication is finished. That is, when the communication quality is lowered to a predetermined level, the procedure of the above embodiment is executed again, and it is known that the communication between both the communication parties is ended.
The present embodiment does not limit a specific method of monitoring communication quality. As long as monitoring of the communication quality can be achieved. For example, the monitoring may be performed by error control coding to detect errors in the information, e.g., a higher error rate may indicate a degraded channel quality. The specific threshold may be determined by the user, for example, the user may determine through specific experimentation. The ratio of signal to noise in the channel can also be monitored to determine the communication quality of the channel. Optionally, monitoring the communication quality according to a predetermined period includes: the communication quality is monitored by using the error control coding at a predetermined period. Further, the present embodiment is not limited to a specific predetermined period, and may be real-time monitoring, or may be once monitoring for 20 seconds.
Referring now to fig. 2, a specific implementation of the method is shown. The signal scheme (which can be understood as a preset communication modulation scheme and communication protocol) specified in fig. 2, and the parameter exchange (i.e. the exchange of the key parameter). Judging whether the channel quality, namely the communication quality, is lower than a threshold (namely setting a threshold); if yes, the scheme is executed again, otherwise, the communication is continued until the communication is finished.
That is, the above embodiment may include the following three stages, i.e., a first stage, a probing stage, for performing channel probing between two communicating parties; a second stage, a circuit reconstruction stage, which reconstructs a relevant signal processing circuit according to the detection result; and in the third stage, in the communication stage, the reconstructed signal processing circuit carries out communication in a finally determined signal mode and monitors the communication quality in real time, and the signal processing circuit returns to the first stage after the communication quality is reduced to a preset value.
Based on the technical scheme, the method for power line communication provided by the embodiment of the application determines the parameters corresponding to reliable communication through power grid channel detection, so that a signal processing circuit is reconstructed, the signal scheme and the modulation and demodulation technology which are most suitable for the current power line channel condition are used, the reliable communication of two communication parties is ensured, the communication quality is monitored in real time, a feedback effect is achieved, the two communication parties can be ensured to communicate in a reliable channel in real time, and the reliability of the communication of the two communication parties is improved.
The system and the power line communication terminal for power line communication provided by the embodiments of the present application are described below, and the system and the power line communication terminal for power line communication described below and the method for power line communication described above may be referred to correspondingly.
Referring to fig. 3, fig. 3 is a block diagram of a power line communication system according to an embodiment of the present disclosure; the system may include:
the detection module 110 is configured to exchange key parameters required for power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and perform power grid channel detection according to an agreed channel detection waveform sequence after the exchange is completed; exchanging parameters corresponding to reliable communication according to a communication modulation mode and a communication protocol according to a power grid channel detection result;
a reconstruction module 120 for reconstructing the signal processing circuit from the parameters;
and a communication module 130, configured to perform communication through the reconstructed signal processing circuit.
Based on the above embodiment, the system may further include:
the monitoring module is used for monitoring the communication quality according to a preset period; .
Based on the above embodiment, the monitoring module specifically measures the communication quality by using the error control code according to the monitoring of the predetermined period; and when the communication quality is less than the set threshold value, executing the module of the detection module.
Referring to fig. 4, fig. 4 is a block diagram of a power line communication terminal according to an embodiment of the present disclosure; the power line communication terminal may include:
a memory 200 for storing a computer program;
a reconfiguration processor 100, configured to perform, according to a computer program in the memory, exchange of key parameters required for power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and perform power grid channel detection according to an agreed channel detection waveform sequence after the exchange is completed; exchanging parameters corresponding to reliable communication according to a communication modulation mode and a communication protocol according to a power grid channel detection result; reconstructing a signal processing circuit according to the parameters; and carrying out communication through the reconstructed signal processing circuit.
In particular, the memory 200 may store a corresponding computer program according to the actual needs of the user,
referring to fig. 5, fig. 5 is a block diagram of another power line communication terminal according to an embodiment of the present disclosure; the power line communication terminal may include:
a wireless communication device 300 for communicating with the outside.
A grid interface circuit 400 for receiving signals from a grid coupling and coupling signals to be transmitted to the grid.
Specifically, the present embodiment does not limit the specific form of the power grid interface circuit 400, and may be implemented by any specific circuit for implementing power grid signal coupling.
The signal conditioning circuit 500 is connected to the power grid interface circuit 400, and is configured to perform amplification conditioning on the coupled signal and perform shaping amplification on the signal output to the power grid.
Specifically, the present embodiment does not limit the specific form of the signal conditioning circuit 500, for example, the signal conditioning circuit 500 is specifically a programmable signal amplifying and conditioning circuit. The system is composed of a programmable signal amplification conditioning circuit of a frequency band supported by the system, and is mainly used for amplifying and processing a received signal coupled in by a power grid interface circuit 400 according to the instruction of a reconstruction processor 100, so that a useful signal is amplified and noise is suppressed, and an output signal meets the requirement of an A/D converter in a digital-to-analog converter 600; on the other hand, the conditioning operation such as shaping and amplifying is performed on the signal output to the power grid by the D/a converter in the digital-to-analog converter 600, so that the output signal can meet the requirement of the current power grid channel.
The digital-to-analog converter 600 is connected to the signal conditioning circuit 500 for converting an analog signal into a digital signal and converting the digital signal into an analog signal.
Specifically, the digital-to-analog converter 600 includes an a/D converter and a D/a converter, and is responsible for converting an analog signal into a digital signal and converting the digital signal into an analog signal. The present embodiment does not limit the specific form of the digital-to-analog converter 600.
Further, the digital-to-analog converter 600 and the signal conditioning circuit 500 may be analog signal front ends integrated on one circuit board (monolithic integrated circuit), such as AC31 or AC32 from TI corporation. The method mainly completes the conditioning work of filtering, amplifying, shaping and the like of received signals coupled from a power grid, digitalizes the signals and sends the signals to a reconstruction processor connected with the digitalization processor for further processing; on the other hand, the digital signal processed by the reconstruction processor is subjected to digital-to-analog signal conversion and conditioning. The partial circuit is connected with the reconstruction processor. In addition, the grid interface circuit 400 is also responsible for providing the required supply voltage conversion for the entire terminal. The grid interface circuit 400 is connected to the front end of the analog signal, and the supply voltage required by the terminal is connected to the rest of the terminal.
The memory 200 is used for storing a signal processing circuit library, a signal detection signal library and a communication signal library for reconstruction.
Specifically, the memory 200 is not limited in this embodiment, and the user may select the storage capacity, the storage speed, the storage cost, and other requirements. Which is primarily responsible for providing the reconstruction processor 100 with signal processing circuit code (i.e., stored in a signal processing circuit library) storage and runtime data storage functions for reconstruction. Optionally, the memory 200 is embodied as a nonvolatile memory and a DRAM memory. Such as non-volatile memory, e.g., local FLASH. A library of pre-designed signal waveforms (i.e. a library of communication signals, a library of reconstructed signal processing circuits also including a library of modulation and demodulation schemes) suitable for the grid channel, and a library of signals for grid channel detection (i.e. a library of signal detection signals) can be stored.
Further, in order to ensure that both communication parties can have reliable communication channels in the whole communication process, the communication quality of both communication parties can also be monitored, so that codes related to the monitored communication quality, such as a forward error coding and decoding library, need to be stored.
These predefined circuit configuration codes or DSP software codes are all stored in the designated area of the memory, and when the circuit or DSP software codes need to be reconfigured, the reconfiguration processor 100 acquires the codes from the designated area to configure the fpga or let the DSP run the corresponding codes, so as to implement dynamic reconfiguration of the circuit or function.
And the reconfiguration processor 100 is configured to be connected to the memory 200 and the digital-to-analog converter 600, respectively, perform reconfiguration of a system signal scheme according to the reconfigured signal processing circuit library, the signal detection signal library and the communication signal library, configure a reconfiguration signal processing circuit, and control a communication process.
Specifically, the present embodiment does not limit the reconfiguration processor 100, and the reconfiguration processor 100 performs a reconfiguration function and a communication function of controlling both communication sides on a signal processing circuit to be reconfigured as long as the reconfiguration processor 100 realizes a channel detection function of both communication sides. Optionally, the reconstruction processor 100 is a digital signal processor (for example, a TMS32PLC84 or TMS32F69 chip of TI corporation is used, and the chip performs signal and information processing operations required by a standard protocol according to a relevant standard), or a field programmable gate array (FGPA) may also be a microprocessor, etc. The system is mainly responsible for controlling A/D sampling, D/A conversion, implementing a channel detection scheme, reconstructing a system signal scheme according to a detection structure, exchanging wireless communication information, producing signal waveforms, modulating and demodulating, filtering in a signal self-adaption mode, controlling a programmable amplifier and conditioning signals, upgrading codes and other system management works. When the reconfiguration processor 100 and the memory 200 can be connected with the memory, the control device controls the reconfiguration of the circuit or the code connected with the reconfiguration processor, which does not support a part of dynamically reconfigurable field programmable gate array or digital signal processor; the other is that the memory is directly connected with a field programmable gate array supporting partial dynamic reconfiguration.
In the prior art, a reconstruction processor is not selected, but an application specific integrated circuit chip scheme is selected, and a circuit in the application specific integrated circuit chip does not support reconstruction and cannot adapt to the change of a power grid channel through the reconstruction of a signal processing circuit, so that the communication speed is improved. Since the signal processing scheme of the prior art is completed by an application specific integrated circuit through a circuit form, the flexibility is very poor, and once the standard is upgraded, the standard can only be replaced by a chip supporting a new standard. By adopting the embodiment, the change of the power grid channel can be adapted through the reconstruction of the internal circuit, the support to a new standard can be realized through the code upgrade, and the existing investment of a user can be greatly saved.
A communication interface 700 connected to the reconstruction processor 100.
Specifically, the present embodiment does not limit the specific form of the communication interface 700, and optionally, the communication interface 700 is specifically a USB interface and an asynchronous serial port circuit. The system is mainly responsible for providing an interface for data communication between the system and the outside; in addition, these interfaces may also provide a communication channel for upgrading system code.
A display 800 for connection to the reconstruction processor 100.
Specifically, the display 800, which mainly performs the display of the required related information, may be an LCD or OLED display.
A wireless communication device 300 for connection to the reconstruction processor 100.
Specifically, the present embodiment does not limit the specific form of the wireless communication device 300, and it can be used as an alternative auxiliary channel to provide a channel for exchanging timely information and relevant key parameters for power line channel detection; communication support may also be provided for over-the-air upgrades of system code. Optionally, the wireless communication device 300 is embodied as a pluggable wireless communication device. So as to save the terminal space and make the terminal structure more flexible. The present embodiments also do not limit the specific form of the pluggable wireless communication device. Optionally, the pluggable wireless communication device is specifically an NB-IoT device. That is, when the carrier communication is successful, the information interaction between both communication parties is realized by using the carrier communication, and if the carrier communication is unsuccessful within the predetermined number of times, the communication between both communication parties can be performed by using the wireless communication device.
The embodiment mainly solves the problem that the power line carrier communication terminal can support a new technical standard through software code upgrading. Namely, the software code of the power carrier communication system is upgraded to support a new power carrier communication standard, so that the existing investment of a user is protected to the maximum extent. In addition, the embodiment also supports narrowband Internet of things (NB-IOT) communication.
Referring to fig. 5, the reconfiguration processor needs to complete the modulation and demodulation of signals of various supported power carrier communication standards, and complete the management of the whole terminal. The management of the wireless communication equipment (such as pluggable wireless communication equipment) and the communication work of the wireless communication link except the power carrier communication link are completed, the management work of the memory is completed, the communication and management work of the communication interface is completed, and the display control work of the display is completed. The reconstruction processor may be a Field Programmable Gate Array (FPGA), a Digital Signal Processor (DSP), or a microcontroller with digital signal processing functionality. The wireless communication device can be a pluggable wireless communication device, and mainly provides a wireless communication link for the terminal except for power carrier communication, so that reliable transmission of signals is ensured. On the other hand, the module can also provide communication support for the terminal system codes to realize reliable over-the-air upgrade through a wireless channel. The pluggable wireless communication device may be various wireless communication modules, such as a LoRa, WiFi, or NB-IoT module. The NB-IoT modules are preferably employed, utilizing carrier grade communication links provided by the telecommunications carrier. When communication is initiated, the terminal firstly communicates through the power carrier communication channel, if the power carrier communication channel communication is unsuccessful, the terminal communicates through the wireless communication channel until the communication is successful. The memory is mainly composed of FLASH and DRAM memories, and provides a program circuit and a storage space required by operation for the reconfiguration processor. If the reconstruction processor is internally provided with a FLASH code memory, the storage module is mainly a DRAM memory. The memory is connected with the reconstruction processor. The communication interface mainly comprises an asynchronous serial port and a USB port, mainly realizes the asynchronous serial communication or high-speed USB communication in local short distance, can complete the local exchange of information, and can complete the local upgrade work of codes through the communication interface. The communication interface is connected with the reconfiguration processor. The display is mainly used for finishing the display work of required local display information, electric quantity and the like, is connected with the reconstruction processor and can be an LCD or OLED display.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The method, the system and the power line communication terminal for power line communication provided by the present application are described in detail above. The principles and embodiments of the present application are explained herein using specific examples, which are provided only to help understand the method and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A method of power line communication, the method comprising:
exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol, and performing power grid channel detection according to an appointed channel detection waveform sequence after the exchange is finished;
exchanging parameters corresponding to reliable communication according to the communication modulation mode and the communication protocol according to the power grid channel detection result;
reconstructing a signal processing circuit from the parameters;
and carrying out communication through the reconstructed signal processing circuit.
2. The method of claim 1, further comprising, after the communication by the reconstructed signal processing circuit:
monitoring communication quality according to a predetermined period;
and when the communication quality is smaller than a set threshold value, executing the step of exchanging key parameters required by the power grid channel detection of the two communication parties according to a preset communication modulation mode and a preset communication protocol.
3. The method of claim 2, wherein said monitoring communication quality at predetermined periods comprises:
the communication quality is monitored by using the error control coding at a predetermined period.
4. The method according to claim 3, wherein the exchanging key parameters required for detecting the grid channel of the two communication parties according to the preset communication modulation mode and the preset communication protocol comprises:
and the communication initiator equipment exchanges key parameters required by the power grid channel detection of the two communication parties by using the ultra-low frequency band according to a preset communication modulation mode and a preset communication protocol.
5. The method of claim 4, wherein performing grid channel sounding according to the agreed channel sounding waveform sequence after the completion of the switching comprises:
and after the exchange is finished, the low frequency band or the high frequency band is utilized to carry out power grid channel detection according to the appointed channel detection waveform sequence.
6. A system for power line communication, comprising:
the detection module is used for exchanging key parameters required by power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol and carrying out power grid channel detection according to an appointed channel detection waveform sequence after the exchange is finished; exchanging parameters corresponding to reliable communication according to the communication modulation mode and the communication protocol according to the power grid channel detection result;
a reconstruction module for reconstructing the signal processing circuit according to the parameters;
and the communication module is used for carrying out communication through the reconstructed signal processing circuit.
7. The system of claim 6, further comprising:
and the monitoring module is used for monitoring the communication quality according to a preset period.
8. The system of claim 7, wherein the monitoring module is configured to monitor the communication quality using error control coding at predetermined periods; and when the communication quality is less than a set threshold value, executing the module of the detection module.
9. A power line communication terminal, comprising:
a memory for storing a computer program;
the reconstruction processor is used for exchanging key parameters required by the power grid channel detection of both communication parties according to a preset communication modulation mode and a preset communication protocol according to the computer program in the memory, and carrying out the power grid channel detection according to an agreed channel detection waveform sequence after the exchange is finished; exchanging parameters corresponding to reliable communication according to the communication modulation mode and the communication protocol according to the power grid channel detection result; reconstructing a signal processing circuit from the parameters; and carrying out communication through the reconstructed signal processing circuit.
10. The power-line communication terminal according to claim 9, characterized by further comprising:
and the wireless communication equipment is used for communicating with the outside.
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