CN108768915B - Multimode communication device in power line communication system - Google Patents
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- 238000005859 coupling reaction Methods 0.000 claims abstract description 25
- 238000001514 detection method Methods 0.000 claims description 41
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0064—Concatenated codes
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- H—ELECTRICITY
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2032—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner
- H04L27/2035—Modulator circuits; Transmitter circuits for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner using a single or unspecified number of carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
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Abstract
The invention belongs to the field of power line carrier communication, and provides a multimode communication device in a power line communication system, which comprises a core processing unit, a coupling unit, a sending unit and a receiving unit, wherein the output end of the core processing unit is connected with the input end of the coupling unit through the sending unit, and the input end of the core processing unit is connected with the output end of the coupling unit through the receiving unit; the transmitting unit comprises a multi-carrier transmitting end communication unit, a first single-carrier transmitting end communication unit, a second single-carrier transmitting end communication unit and a first analog front end unit; the receiving unit comprises a multi-carrier receiving end communication unit, a first single-carrier receiving end communication unit, a second single-carrier receiving end communication unit and a second analog front end unit. The invention can ensure the power line communication performance and simultaneously consider various communication rate application scenarios, and can be widely applied to the power line carrier communication field and the single carrier multi-carrier hybrid network communication field.
Description
Technical Field
The invention belongs to the field of power line carrier communication, and particularly relates to a multimode communication device for a power communication system.
Background
The power line carrier communication technology is a communication mode for carrying out data transmission by using a power line as a medium, and has natural advantages. Along with the construction of a national smart grid, a power line is favored as an economic and convenient communication medium, however, the environment of the power grid in China is complex, a plurality of electric appliance bands connected to the power grid have various interferences on a power line communication channel due to interference signals generated by the electric appliance bands, particularly, the noise interference in a low-frequency band of 1MHz is large, the interference forms are various, the main colored background noise, the narrow-band interference, the pulse interference, the periodic noise synchronous with the power frequency, the periodic noise asynchronous with the power frequency and the like are mainly generated, and the pulse interference synchronous with the power frequency and the pulse interference asynchronous with the power frequency can be classified into the narrow-band interference of the frequency domain and the burst pulse interference of the time domain.
For a single carrier system, the influence of narrowband interference on the system performance is large, once the interference frequency coincides with the system communication frequency, the performance is greatly reduced, the communication rate of the single carrier system in the current power line carrier application is low, and the current application requirement cannot be well met by a single carrier system.
Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, abbreviated OFDM) is a modulation method that is currently used in high-speed applications, and has the advantage of converting a frequency selective channel into a flat fading channel, and using a cyclic prefix to overcome the influence of intersymbol interference (Inter-Symbol Interference, ISI) brings higher speed to the system, and meanwhile, the capability of resisting narrowband interference is improved because the channel is divided into a plurality of sub-channels. However, in the power line channel environment, due to the unstable multipath delay caused by factors such as user load change, the influence of multipath cannot be completely eliminated by using the cyclic prefix in some cases, and performance influence is brought to the OFDM multi-carrier system.
In the existing power communication system, any one of an OFDM modulation, a DBPSK (binary differential phase shift keying) modulation and a BFSK (binary frequency shift keying) modulation mode has the disadvantage that the system performance in different noise forms in the power line communication field cannot be completely met by a single communication mode, when noise and interference of a certain inherent frequency band exist, the performance of the single communication mode can be seriously interfered, and the requirement of different application rates cannot be met by the single communication mode on the basis of ensuring the performance. Therefore, there is a need to propose a communication device that can be applied to a power line communication system to solve the above-described problems.
Disclosure of Invention
In order to adapt to the actual demands in the field of power line carrier communication, the invention overcomes the defects existing in the prior art, and solves the technical problems that: a multimode communication device in a power line communication system is provided, which ensures the power line communication performance and simultaneously gives consideration to various communication rate application scenarios.
In order to solve the technical problems, the invention adopts the following technical scheme: the multimode communication device in the power line communication system comprises a core processing unit, a coupling unit, a sending unit and a receiving unit, wherein the output end of the core processing unit is connected with the input end of the coupling unit through the sending unit, and the input end of the core processing unit is connected with the output end of the coupling unit through the receiving unit; the transmitting unit comprises a multi-carrier transmitting end communication unit, a first single-carrier transmitting end communication unit, a second single-carrier transmitting end communication unit and a first analog front end unit, wherein the input ends of the multi-carrier transmitting end communication unit, the first single-carrier transmitting end communication unit and the second single-carrier transmitting end communication unit are respectively connected with the output end of the core processing unit, and the output ends are respectively connected with the input end of the coupling unit through the first analog front end unit; the receiving unit comprises a multi-carrier receiving end communication unit, a first single-carrier receiving end communication unit, a second single-carrier receiving end communication unit and a second analog front end unit, wherein the input ends of the multi-carrier receiving end communication unit, the first single-carrier receiving end communication unit and the second single-carrier receiving end communication unit are respectively connected with the output end of the coupling unit through the second analog front end unit, and the output ends are respectively connected with the input end of the core processing unit.
The multi-carrier transmitting end communication unit adopts OFDM modulation, and the multi-carrier receiving end communication unit adopts an OFDM demodulation mode; the first single-carrier transmitting end communication unit adopts DBPSK modulation, and the first single-carrier receiving end communication unit adopts a DBPSK demodulation mode; the second single-carrier transmitting end communication unit adopts BFSK modulation, and the second single-carrier receiving end communication unit adopts BFSK demodulation mode.
The transmitting unit further comprises a multiplexing coding unit which is respectively connected with the multi-carrier transmitting end communication unit and the first single-carrier transmitting end communication unit and is used for performing forward error correction coding on signals received by the first single-carrier transmitting end communication unit or the multi-carrier transmitting end communication unit; the receiving unit further comprises a multiplexing decoding unit, and the multiplexing decoding unit is respectively connected with the multi-carrier receiving end communication unit and the first single-carrier receiving end communication unit and is used for performing forward error correction decoding on signals received by the first single-carrier receiving end communication unit or the multi-carrier receiving end communication unit.
The multi-carrier transmitting end communication unit comprises a first multi-carrier coding module, a second multi-carrier coding module and a multi-carrier modulation module; the first single-carrier transmitting end communication unit comprises a first single-carrier modulation module, and the second single-carrier transmitting end communication unit comprises a single-carrier coding module and a second single-carrier modulation module; the input end of the multiplexing coding unit is connected with the output end of the first analog front end unit, the first input end of the multiplexing coding unit is connected with the output end of the first multi-carrier coding unit, the second input end of the multiplexing coding unit is connected with the core processing unit, the first output end of the multiplexing coding unit is connected with the first analog front end unit through the second multi-carrier coding module and the multi-carrier modulation module in sequence, and the second output end of the multiplexing coding unit is connected with the first analog front end unit through the first single-carrier modulation module; the input end of the single-carrier coding module is connected with the output end of the core processing unit, and the output end of the single-carrier coding module is connected with the first analog front end unit through the second single-carrier modulation module;
the multi-carrier receiving end communication unit comprises a first multi-carrier decoding module, a second multi-carrier decoding module, a multi-carrier demodulation module and a multi-carrier detection module; the first single-carrier receiving-end communication unit comprises a first single-carrier demodulation module and a first single-carrier detection module, and the second single-carrier receiving-end communication unit comprises a single-carrier decoding module, a second single-carrier demodulation module and a second single-carrier detection module; the input ends of the multi-carrier detection module, the first single-carrier detection module and the second single-carrier detection module are connected with the output end of the coupling unit through the second analog front end unit, the output end of the multi-carrier detection module is connected with the first input end of the multiplexing decoding unit after passing through the multi-carrier demodulation module and the second multi-carrier receiving end decoding module in sequence, and the first output end of the multiplexing decoding unit is connected with the input end of the core processing unit after passing through the first multi-carrier receiving end decoding module; the output end of the first single carrier detection module is connected with the second input end of the multiplexing decoding unit after passing through the first single carrier demodulation module, and the second output end of the multiplexing decoding unit is connected with the core processing unit; and the output end of the second single carrier detection module is connected with the input end of the core processing unit after passing through the second single carrier demodulation module and the single carrier decoding module in sequence.
The multiplexing coding unit comprises a first multiplexing coding module and a second multiplexing coding module; the multiplexing decoding unit comprises a first multiplexing decoding module and a second multiplexing decoding module.
Compared with the prior art, the invention has the following beneficial effects:
1. the multimode communication device provided by the invention comprises a plurality of communication modes, when the channel environment is good, a multicarrier communication system can be adopted, the system rate can be improved, when the noise interference influence of the channel environment is large, the communication rate can be reduced, a single carrier communication system with more robust performance is adopted, the reliability of the system is ensured, the complementary advantages of the multicarrier and single carrier fusion system can be realized, the problem of poor communication performance caused by random noise interference change in the power line communication channel environment is solved, and in addition, the application requirement of the single carrier and multicarrier hybrid network can be met.
2. The invention combines the characteristics of the power line channel environment, integrates three different modulation modes of multi-carrier OFDM modulation, single-carrier DBPSK modulation and single-carrier BFSK modulation to form a communication mode complementary system, can better ensure the power line communication performance and simultaneously consider various communication rate application scenes, and simultaneously, the communication device can be adaptively switched according to the use environment.
Drawings
Fig. 1 is a schematic structural diagram of a multimode communication device for a power line communication system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a multimode communication device for a power line communication system according to another embodiment of the invention.
Detailed Description
In order to make the technical solution and advantages of the present invention more apparent, a technical solution of the present invention will be clearly and completely described below with reference to specific embodiments and drawings, it being apparent that the described embodiments are some but not all embodiments of the present invention; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, the multimode communication device in a power line communication system provided by the embodiment of the invention comprises a core processing unit, a coupling unit, a sending unit and a receiving unit, wherein the output end of the core processing unit is connected with the input end of the coupling unit through the sending unit, and the input end of the core processing unit is connected with the output end of the coupling unit through the receiving unit; the transmitting unit comprises a multi-carrier transmitting end communication unit, a first single-carrier transmitting end communication unit, a second single-carrier transmitting end communication unit and a first analog front end unit, wherein the input ends of the multi-carrier transmitting end communication unit, the first single-carrier transmitting end communication unit and the second single-carrier transmitting end communication unit are respectively connected with the output end of the core processing unit, and the output ends are respectively connected with the input end of the coupling unit through the first analog front end unit; the receiving unit comprises a multi-carrier receiving end communication unit, a first single-carrier receiving end communication unit, a second single-carrier receiving end communication unit and a second analog front end unit, wherein the input ends of the multi-carrier receiving end communication unit, the first single-carrier receiving end communication unit and the second single-carrier receiving end communication unit are respectively connected with the output end of the coupling unit through the second analog front end unit, and the output ends are respectively connected with the input end of the core processing unit.
In this embodiment, the multi-carrier transmitting end communication unit adopts OFDM modulation, and the multi-carrier receiving end communication unit adopts OFDM demodulation; the first single-carrier transmitting end communication unit adopts DBPSK modulation, and the first single-carrier receiving end communication unit adopts a DBPSK demodulation mode; the second single-carrier transmitting end communication unit adopts BFSK modulation, and the second single-carrier receiving end communication unit adopts BFSK demodulation mode. In this embodiment, by combining multi-carrier OFDM modulation with single-carrier DBPSK modulation or single-carrier BFSK modulation, a communication mode complementary system is formed, which can better ensure the power line communication performance and simultaneously consider various communication rate application scenarios. The invention combines the two modulation modes of the single carrier wave and the multi-carrier wave applied in the power line carrier communication system into the same communication chip, so that the communication chip can support three communication modes at the same time, the system has more application selectivity and more flexible modes.
Specifically, as shown in fig. 1, in the multimode communication device in the power line communication system provided by this embodiment, the transmitting unit further includes a multiplexing coding unit, where the multiplexing coding unit is connected to the multicarrier transmitting end communication unit and the first single-carrier transmitting end communication unit, and is configured to perform forward error correction coding on signals received by the first single-carrier transmitting end communication unit or the multicarrier transmitting end communication unit; the receiving unit further comprises a multiplexing decoding unit, and the multiplexing decoding unit is respectively connected with the multi-carrier receiving end communication unit and the first single-carrier receiving end communication unit and is used for performing forward error correction decoding on signals received by the first single-carrier receiving end communication unit or the multi-carrier receiving end communication unit. In this embodiment, the multi-carrier transmitting-end wave communication unit and the first single-carrier transmitting-end communication unit multiplex the forward error correction coding module, and the multi-carrier receiving-end wave communication unit and the first single-carrier receiving-end communication unit multiplex the forward error correction decoding module, so that the purpose of saving design cost can be achieved.
As shown in fig. 2, a multimode communication device in a power line communication system according to another embodiment of the present invention is the same as the previous embodiment, and the multimode communication device in a power line communication system according to this embodiment includes a core processing unit, a coupling unit, a transmitting unit, and a receiving unit, where the transmitting unit includes a multicarrier transmitting end communication unit, a first single-carrier transmitting end communication unit, a second single-carrier transmitting end communication unit, and a first analog front end unit, and the receiving unit includes a multicarrier receiving end communication unit, a first single-carrier receiving end communication unit, a second single-carrier receiving end communication unit, and a second analog front end unit. Unlike the previous embodiment, in this embodiment, the multi-carrier transmitting end communication unit includes a first multi-carrier encoding module, a second multi-carrier encoding module, and a multi-carrier modulating module; the first single-carrier transmitting end communication unit comprises a first single-carrier modulation module, and the second single-carrier transmitting end communication unit comprises a single-carrier coding module and a second single-carrier modulation module; the input end of the multiplexing coding unit is connected with the output end of the first analog front end unit, the first input end of the multiplexing coding unit is connected with the output end of the first multi-carrier coding unit, the second input end of the multiplexing coding unit is connected with the core processing unit, the first output end of the multiplexing coding unit is connected with the first analog front end unit through the second multi-carrier coding module and the multi-carrier modulation module in sequence, and the second output end of the multiplexing coding unit is connected with the first analog front end unit through the first single-carrier modulation module; the input end of the single carrier coding module is connected with the output end of the core processing unit, and the output end of the single carrier coding module is connected with the first analog front end unit through the second single carrier modulation module.
Further, the present embodiment is different from the previous embodiment in that the multicarrier receiving-end communication unit includes a first multicarrier decoding module, a second multicarrier decoding module, a multicarrier demodulation module, and a multicarrier detection module; the first single-carrier receiving-end communication unit comprises a first single-carrier demodulation module and a first single-carrier detection module, and the second single-carrier receiving-end communication unit comprises a single-carrier decoding module, a second single-carrier demodulation module and a second single-carrier detection module; the input ends of the multi-carrier detection module, the first single-carrier detection module and the second single-carrier detection module are connected with the output end of the coupling unit through the second analog front end unit, the output end of the multi-carrier detection module is connected with the first input end of the multiplexing decoding unit after passing through the multi-carrier demodulation module and the second multi-carrier receiving end decoding module in sequence, and the first output end of the multiplexing decoding unit is connected with the input end of the core processing unit after passing through the first multi-carrier receiving end decoding module; the output end of the first single carrier detection module is connected with the second input end of the multiplexing decoding unit after passing through the first single carrier demodulation module, and the second output end of the multiplexing decoding unit is connected with the core processing unit; and the output end of the second single carrier detection module is connected with the input end of the core processing unit after passing through the second single carrier demodulation module and the single carrier decoding module in sequence.
Further, the present embodiment is also different from the previous embodiment in that the multiplexing coding unit includes a first multiplexing coding module and a second multiplexing coding module; the multiplexing decoding unit comprises a first multiplexing decoding module and a second multiplexing decoding module.
In this embodiment, the primary function of the multi-carrier first coding module is to randomize the transmission sequence, reduce the peak-to-average ratio of the multi-carrier modulation signal, and the multi-carrier first decoding module is an inverse processing unit of the multi-carrier transmitting end first coding module; the first multiplexing coding module and the second multiplexing coding module are cascade codes of forward error correction coding, the same coding structure is adopted in the multi-carrier communication unit and the first single-carrier communication unit, but different coding parameters are used, the first multiplexing coding module and the second multiplexing coding module are respectively the decoding processing procedures of the first multiplexing coding module and the second multiplexing coding module, the forward error correction coding module is multiplexed by the multi-carrier transmitting end wave communication unit and the first single-carrier transmitting end communication unit in design, and the forward error correction coding module is multiplexed by the multi-carrier receiving end wave communication unit and the first single-carrier receiving end communication unit, so that the aim of saving design cost can be achieved.
In this embodiment, the function of the multi-carrier second encoding module is mainly used for performing interleaving processing and repeated encoding processing on data, and the function of the multi-carrier second decoding module is used for performing inverse processing on the multi-carrier second encoding module. The decoding process is performed at the receiving end. In addition, the multi-carrier detection module, the first single-carrier detection module and the second single-carrier detection module are used for synchronizing and estimating channels of output signals of the second analog front-end communication unit, and the synchronization process can determine whether the signals are single-carrier signals or multi-carrier signals according to different received signal characteristic results.
The working principle of the invention is as follows: at a transmitting end, a core processing unit frames data to be transmitted and transmits the data to the transmitting unit, the core processing unit configures in advance whether the data to be transmitted is transmitted to a multi-carrier transmitting end communication unit or a single-carrier transmitting end communication unit, if the core processing unit indicates that the data to be transmitted is transmitted to the multi-carrier transmitting end communication unit, the data to be transmitted is firstly transmitted to a first multi-carrier coding module for sequence randomization processing, the randomized data is sequentially transmitted to a first multiplexing coding module and a second multiplexing coding module for forward error correction coding processing so as to enhance the anti-interference capability of the data at a receiving end, the second multi-carrier coding module carries out interleaving and diversity processing on the output data of the second multiplexing coding module so as to carry out continuous error discretization and repeated coding, the robustness of the data is further enhanced, the data processed by the second multi-carrier coding module is transmitted to a multi-carrier modulation unit, the modulated data is converted into analog signals through a first analog front end unit and is transmitted to a power line for data communication through a coupling unit; if the core processing unit indicates that the data to be transmitted is sent to the single carrier transmission communication unit, single carrier path processing is carried out on the data to be transmitted, if the core processing unit indicates that the data is processed through the first single carrier communication unit, the data to be transmitted is sent to the first multiplexing coding module and the second multiplexing coding module for forward error correction coding processing, the coded data is output to the first single carrier modulation unit for single carrier modulation processing, the modulated data is converted into analog signals through the first analog front end unit, and the analog signals are sent to a power line through the coupling unit for data communication; if the core processing unit indicates the second single carrier communication unit to process data, the data to be sent is sent to the single carrier coding module to perform spread spectrum coding processing so as to enhance anti-interference performance, the coded data is sent to the second single carrier modulation unit to perform single carrier modulation processing, the modulated data is converted into analog signals through the first analog front end unit, and the analog signals are sent to the power line through the coupling unit to perform data communication.
In the design of the invention, the characteristics of the received signals are analyzed at the receiving end according to the detection results of the multi-carrier detection module and the first single-carrier detection module and the second single-carrier detection module respectively, and the receiving mode of the subsequent module is determined in a self-adaptive manner according to the judgment result of the signal characteristics. That is, at the receiving end, whether the subsequent data is processed by the single-carrier communication unit or the multi-carrier communication unit is determined according to the detection result of the receiving detection module, and for different processes, whether the first multiplexing decoding module and the second multiplexing decoding module are occupied by the multi-carrier receiving end communication unit or the first single-carrier receiving end communication unit is determined according to the priority, so as to support the preferential occupancy of the multi-carrier communication unit by default, thereby ensuring the system efficiency of the multi-carrier application mode. If the receiving end single carrier detection module detects that the received signal is a single carrier signal, the single carrier communication unit is used for processing, and the receiving end single carrier detection module adaptively selects whether the received signal is sent to the first single carrier demodulation module for processing or is sent to the second single carrier demodulation module for processing according to the characteristics of the signal, if the received signal is sent to the first single carrier demodulation module for processing, after the demodulation processing is finished, the first single carrier receiving end communication unit can acquire the occupation information of the first multiplexing decoding module and the second multiplexing decoding module through the core processing unit to determine whether the current first multiplexing decoding module and the second multiplexing decoding module are idle, if the current first multiplexing decoding module and the second multiplexing decoding module are not idle, a set period of time is waited, the occupation condition of the first multiplexing decoding module and the second multiplexing decoding module can be acquired again after the time is up, if the received signal is not occupied, the core processing unit sends the data after the first single carrier demodulation module into the second multiplexing decoding module for processing, and the first multiplexing decoding module for processing is finished, and the first multiplexing decoding module is sent to the core processing unit for completing the single carrier receiving process; if the message is occupied, discarding the received message, and stopping receiving; if the signal is sent to the second single carrier demodulation module for processing, the second single carrier demodulation module does not occupy the multiplexing decoding module, so that the core processing unit is not needed to acquire the occupation information of the first multiplexing decoding module and the second multiplexing decoding module, the information processed by the second single carrier detection module is directly sent to the second single carrier demodulation module for processing, and then sent to the single carrier decoding module for decoding processing, and finally sent to the core processing unit for completing the single carrier receiving process; if the receiving end multi-carrier detection module detects that the received signal is a multi-carrier signal, the data is sent to the multi-carrier demodulation module after the multi-carrier detection module, the data is sent to the second multi-carrier decoding module for processing after the multi-carrier demodulation module finishes processing, the occupation information of the multiplexing first decoding module and the multiplexing second decoding module is confirmed through the core processing unit, if the information is occupied, the data processed by the second multi-carrier decoding module is buffered until the first multiplexing decoding module and the second multiplexing decoding module are unoccupied, then the data is sent to the second multiplexing decoding module for processing, the data is sent to the first multiplexing decoding module for processing after the processing of the second multiplexing decoding module finishes, the data is sent to the first multi-carrier decoding module for processing after the processing, and finally the data is sent to the core processing unit.
Because the noise interference change is random in the power line communication channel environment, the multimode communication device provided by the invention comprises a plurality of communication modes, when the channel environment is good, a multicarrier communication system can be adopted, the system rate is improved, when the influence of the noise interference of the channel environment is large, the communication rate can be reduced, a single carrier communication system with more robust performance is adopted, the reliability of the system is ensured, the complementary advantages of the multicarrier and the single carrier fusion system can be realized, and the application requirement of the single carrier multicarrier mixed network communication can be met.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (4)
1. The multimode communication device in the power line communication system is characterized by comprising a core processing unit, a coupling unit, a transmitting unit and a receiving unit, wherein the output end of the core processing unit is connected with the input end of the coupling unit through the transmitting unit, and the input end of the core processing unit is connected with the output end of the coupling unit through the receiving unit;
the transmitting unit comprises a multi-carrier transmitting end communication unit, a first single-carrier transmitting end communication unit, a second single-carrier transmitting end communication unit and a first analog front end unit, wherein the input ends of the multi-carrier transmitting end communication unit, the first single-carrier transmitting end communication unit and the second single-carrier transmitting end communication unit are respectively connected with the output end of the core processing unit, and the output ends are respectively connected with the input end of the coupling unit through the first analog front end unit;
the receiving unit comprises a multi-carrier receiving end communication unit, a first single-carrier receiving end communication unit, a second single-carrier receiving end communication unit and a second analog front end unit, wherein the input ends of the multi-carrier receiving end communication unit, the first single-carrier receiving end communication unit and the second single-carrier receiving end communication unit are respectively connected with the output end of the coupling unit through the second analog front end unit, and the output ends are respectively connected with the input end of the core processing unit; the multi-carrier transmitting end communication unit adopts OFDM modulation, and the multi-carrier receiving end communication unit adopts an OFDM demodulation mode; the first single-carrier transmitting end communication unit adopts DBPSK modulation, and the first single-carrier receiving end communication unit adopts a DBPSK demodulation mode; the second single-carrier transmitting end communication unit adopts BFSK modulation, and the second single-carrier receiving end communication unit adopts BFSK demodulation mode.
2. The multimode communication device in a power line communication system according to claim 1, wherein the transmitting unit further comprises a multiplexing coding unit, and the multiplexing coding unit is connected to the multicarrier transmitting end communication unit and the first single-carrier transmitting end communication unit, respectively, and is configured to perform forward error correction coding on signals received by the first single-carrier transmitting end communication unit or the multicarrier transmitting end communication unit;
the receiving unit further comprises a multiplexing decoding unit, and the multiplexing decoding unit is respectively connected with the multi-carrier receiving end communication unit and the first single-carrier receiving end communication unit and is used for performing forward error correction decoding on signals received by the first single-carrier receiving end communication unit or the multi-carrier receiving end communication unit.
3. The multimode communication device in a power line communication system according to claim 2, wherein the multicarrier transmitting end communication unit comprises a first multicarrier coding module, a second multicarrier coding module, and a multicarrier modulation module; the first single-carrier transmitting end communication unit comprises a first single-carrier modulation module, and the second single-carrier transmitting end communication unit comprises a single-carrier coding module and a second single-carrier modulation module; the input end of the multiplexing coding unit is connected with the output end of the first analog front end unit, the first input end of the multiplexing coding unit is connected with the output end of the first multi-carrier coding unit, the second input end of the multiplexing coding unit is connected with the core processing unit, the first output end of the multiplexing coding unit is connected with the first analog front end unit through the second multi-carrier coding module and the multi-carrier modulation module in sequence, and the second output end of the multiplexing coding unit is connected with the first analog front end unit through the first single-carrier modulation module; the input end of the single-carrier coding module is connected with the output end of the core processing unit, and the output end of the single-carrier coding module is connected with the first analog front end unit through the second single-carrier modulation module;
the multi-carrier receiving end communication unit comprises a first multi-carrier decoding module, a second multi-carrier decoding module, a multi-carrier demodulation module and a multi-carrier detection module; the first single-carrier receiving-end communication unit comprises a first single-carrier demodulation module and a first single-carrier detection module, and the second single-carrier receiving-end communication unit comprises a single-carrier decoding module, a second single-carrier demodulation module and a second single-carrier detection module; the input ends of the multi-carrier detection module, the first single-carrier detection module and the second single-carrier detection module are connected with the output end of the coupling unit through the second analog front end unit, the output end of the multi-carrier detection module is connected with the first input end of the multiplexing decoding unit after passing through the multi-carrier demodulation module and the second multi-carrier decoding module in sequence, and the first output end of the multiplexing decoding unit is connected with the input end of the core processing unit after passing through the first multi-carrier decoding module; the output end of the first single carrier detection module is connected with the second input end of the multiplexing decoding unit after passing through the first single carrier demodulation module, and the second output end of the multiplexing decoding unit is connected with the core processing unit; and the output end of the second single carrier detection module is connected with the input end of the core processing unit after passing through the second single carrier demodulation module and the single carrier decoding module in sequence.
4. The multimode communication device in a power line communication system according to claim 2, wherein the multiplexing coding unit includes a first multiplexing coding module and a second multiplexing coding module; the multiplexing decoding unit comprises a first multiplexing decoding module and a second multiplexing decoding module.
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