CN115118308A - Power transmission line high-speed communication method and system based on serial number modulation - Google Patents
Power transmission line high-speed communication method and system based on serial number modulation Download PDFInfo
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- CN115118308A CN115118308A CN202210736565.0A CN202210736565A CN115118308A CN 115118308 A CN115118308 A CN 115118308A CN 202210736565 A CN202210736565 A CN 202210736565A CN 115118308 A CN115118308 A CN 115118308A
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Abstract
The invention provides a power transmission line high-speed communication method and a system based on serial number modulation, wherein the method comprises the steps of dividing transmission time into a plurality of time slices, and labeling different serial numbers for each time slice; performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit; respectively modulating and mapping to corresponding time slices; generating a sending signal according to the time slice sequence number, transmitting the sending signal through a power transmission line, and demodulating the sending signal to obtain a restored modulation bit and a restored sequence number bit; and finally performing parallel/serial conversion, thereby obtaining received data. The invention sends extra serial number bits through the time slice serial number of the power transmission line communication system, and can effectively avoid the influence of serious multipath effect of a power transmission line transmission channel by adjusting the number of time slices, thereby realizing reliable power communication with high speed and high energy efficiency.
Description
Technical Field
The invention belongs to the technical field of power system communication, and particularly relates to a power transmission line high-speed communication method and system based on serial number modulation.
Background
In recent years, with the expansion of electric power equipment, more and more power metering needs have been proposed. The traditional electric power metering adopts a manual meter reading mode, so that the efficiency is low, meanwhile, the labor cost is very high, and the current situation of the current social development is not adapted. The main application scene of the power line carrier communication is applied to an intelligent electricity metering terminal, and high-level functions such as charging, load balancing, data management and the like are executed by means of an intelligent electricity meter, so that integration similar to intelligent home and intelligent building equipment is realized.
In past studies, a power line communication channel has severe multipath influence and frequency selective fading, which often makes the power line channel difficult to model. However, how to improve the transmission efficiency as much as possible by using a limited frequency domain range in a power line communication environment with severe multipath fading, large time delay and complex noise becomes a main problem to be solved urgently in power line communication. In addition, the time-varying channel and noise pulses generated by the switching in and out of devices in the circuit are also research challenges to achieve high-speed reliable communication.
Disclosure of Invention
In view of this, the present invention is directed to solve the problem of the existing power line communication environment that the transmission efficiency is reduced due to the severe multipath fading, the large time delay and the complex noise.
In order to solve the technical problems, the invention provides the following technical scheme:
in a first aspect, the present invention provides a serial number modulation-based high-speed communication method for a power transmission line, including the following steps:
dividing the transmission time into a plurality of time slices, and labeling different serial numbers for each time slice;
performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit;
modulating the modulation bit and the serial number bit respectively and mapping to a corresponding time slice;
generating a sending signal according to the time slice sequence number and transmitting the sending signal through a power transmission line;
demodulating the transmitted sending signal as a receiving signal to obtain a restored modulation bit and a serial number bit;
and carrying out parallel/serial conversion on the restored modulation bits and serial number bits so as to obtain received data.
Further, performing serial/parallel conversion on the transmission data on the power transmission line to obtain a modulation bit and a sequence number bit, specifically:
dividing the sending data on the power transmission line into a plurality of groups of data bit sequences, wherein the number of the data bit sequences in each group is p;
and performing serial/parallel conversion on each group of data bit sequences to obtain 1 modulation bit and p-1 serial number bits.
Further, the mapping of the modulated bits and the serial number bits to the corresponding time slices after being modulated respectively specifically is as follows:
for each group of data bit sequences, carrying out serial number modulation on p-1 serial number bits, mapping to time slices of corresponding serial numbers, wherein the serial numbers of the time slices correspond to the serial number bit sequences one by one;
and carrying out binary phase modulation on the 1 modulation bit, and mapping the 1 modulation bit to a time slice corresponding to the p-1 serial numbers.
Further, the number of sequence numbers of the time slices and the number of sequence number bits conform to the following relationship:
wherein q is the number of sequence bits, N is the number of time slices, C (N,1) represents a binomial coefficient,
representing a floor function.
Further, demodulation processing is performed on the transmitted transmission signal as a received signal based on a maximum likelihood criterion according to the following formula:
s (t) max { | y (t) -hs i (t)| 2 }
Wherein s (t) represents an estimated transmission signal, y (t) represents the reception signal, h represents a channel coefficient of a power line channel, and s i (t) corresponding to the i possible combinations of transmission bits.
In a second aspect, the present invention provides a serial number modulation-based high-speed communication system for an electric power transmission line, including: a transmitting node and a receiving node;
the sending node is used for dividing the transmission time into a plurality of time slices and marking different serial numbers for each time slice; performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit; respectively modulating the modulation bit and the serial number bit and mapping to a corresponding time slice; generating a sending signal according to the time slice sequence number and transmitting the sending signal through a power transmission line;
the receiving node is used for demodulating the transmitted sending signal as a receiving signal to obtain a restored modulation bit and a serial number bit; and carrying out parallel/serial conversion on the restored modulation bits and serial number bits so as to obtain received data.
Further, the sending node obtains a modulation bit and a sequence number bit, specifically:
dividing the sending data on the power transmission line into a plurality of groups of data bit sequences, wherein the number of the data bit sequences in each group is p;
and performing serial/parallel conversion on each group of data bit sequences to obtain 1 modulation bit and p-1 serial number bits.
Further, the sending node respectively modulates the modulation bits and the sequence number bits and then maps the modulated bits and the sequence number bits to corresponding time slices, specifically:
for each group of data bit sequences, carrying out serial number modulation on p-1 serial number bits, mapping to time slices of corresponding serial numbers, wherein the serial numbers of the time slices correspond to the serial number bit sequences one by one;
and carrying out binary phase modulation on the 1 modulation bit, and mapping the 1 modulation bit to a time slice corresponding to the p-1 serial numbers.
Further, the number of sequence numbers of the time slices and the number of sequence number bits conform to the following relationship:
wherein q is the number of sequence bits, N is the number of time slices, C (N,1) represents a binomial coefficient,
representing a floor function.
Further, the receiving node demodulates the transmitted transmission signal as a received signal based on a maximum likelihood criterion according to the following formula:
s (t) { | y (t) -hs maximum i (t)| 2 }
Wherein s (t) represents an estimated transmission signal, y (t) represents the reception signal, h represents a channel coefficient of a power line channel, and s i (t) corresponding to the i possible combinations of transmission bits.
In summary, the present invention provides a method and a system for high-speed communication of a power transmission line based on serial number modulation, wherein the method of the present invention comprises dividing transmission time into a plurality of slots, and labeling each slot with a different serial number; performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit; respectively modulating and mapping to corresponding time slices; generating a sending signal according to the time slice sequence number, transmitting the sending signal through a power transmission line, and demodulating the sending signal to obtain a restored modulation bit and a restored sequence number bit; and finally performing parallel/serial conversion, thereby obtaining received data. The invention sends extra serial number bits through the time slice serial number of the power transmission line communication system, and can effectively avoid the influence of serious multipath effect of a power transmission line transmission channel by adjusting the time slice number, thereby realizing reliable power communication with high speed and high energy efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
Fig. 1 is a schematic flowchart of a serial number modulation-based high-speed communication method for a power transmission line according to an embodiment of the present invention;
fig. 2 is an operation logic diagram of a power transmission line high-speed communication system based on serial number modulation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only a part of the embodiments of the present invention, and not all of the 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 invention.
In recent years, with the expansion of electric power equipment, more and more power metering needs are being put forward. The traditional electric power metering adopts a manual meter reading mode, so that the efficiency is low, meanwhile, the labor cost is very high, and the current situation of the current social development is not adapted. The main application scene of the power line carrier communication is applied to an intelligent electricity metering terminal, and high-level functions such as charging, load balancing, data management and the like are executed by means of an intelligent electricity meter, so that integration similar to intelligent home and intelligent building equipment is realized.
In past studies, a power line communication channel has severe multipath influence and frequency selective fading, which often makes the power line channel difficult to model. However, how to adopt a limited frequency domain range to improve transmission efficiency as much as possible in a power line communication environment with severe multipath fading, large time delay and complex noise becomes a main problem to be solved urgently in power line communication. In addition, the time-varying channel and noise pulses generated by the switching in and out of devices in the circuit are also research challenges to achieve high-speed reliable communication.
Based on the method, the invention provides a power transmission line high-speed communication method and system based on serial number modulation.
An embodiment of the present invention of a serial number modulation-based high-rate communication method for a power transmission line is described in detail below.
Referring to fig. 1, the present embodiment provides a serial number modulation-based high-speed communication method for a power transmission line, including:
s100: the transmission time is divided into a plurality of time slices, and different serial numbers are marked for each time slice.
The sequence number is "1, 2, …, and N" in this order by the sequential numbering method.
S200: the transmission data on the power transmission line is serial/parallel converted to obtain a modulation bit and a sequence number bit.
Serial/parallel conversion is the conversion of a series of data bits transmitted in series into a series of data bits transmitted in parallel. Specifically, the transmission data on the power transmission line is divided into a plurality of groups of data bit sequences, and the number of the data bit sequences in each group is p; and performing serial/parallel conversion on each group of data bit sequences to obtain 1 modulation bit and p-1 serial number bits.
S300: and respectively modulating the modulation bits and the serial number bits and mapping the modulated bits and the serial number bits to corresponding time slices.
It should be noted that, for each group of data bit sequences, sequence number modulation is performed on p-1 sequence number bits, and time slices with corresponding sequence numbers are mapped, wherein the sequence numbers of the time slices correspond to the sequence numbers of the sequence number bits one to one; and carrying out binary phase modulation on the 1 modulation bit, and mapping the 1 modulation bit to a time slice corresponding to the p-1 serial numbers.
The number of the sequence numbers of the time slices and the number of the sequence number bits accord with the following relationship:
wherein q is the number of sequence bits, N is the number of time slices, C (N,1) represents a binomial coefficient,
representing a floor function.
S400: the transmission signal is generated in accordance with the time slice sequence number and transmitted through the power transmission line.
Each time slice includes a sequence number bit and a modulation bit corresponding to the sequence number. And sequentially transmitting the modulated sequence number bit and the modulated bit according to the time slice sequence number through a power transmission line.
S500: and demodulating the transmitted sending signal as a receiving signal to obtain restored modulation bits and serial number bits.
It should be noted that the demodulation process specifically performs a demodulation process (i.e., joint demodulation) on the sequence number bits and the modulation bits in the received signal at the same time, and the demodulation process may be performed based on a maximum likelihood criterion, and performed according to the following formula based on the maximum likelihood criterion:
s (t) max { | y (t) -hs i (t)| 2 }
Wherein s (t) represents an estimated transmission signal, y (t) represents the reception signal, h represents a channel coefficient of a power line channel, and s i (t) corresponding to the i possible combinations of transmission bits.
S600: and carrying out parallel/serial conversion on the restored modulation bits and serial number bits so as to obtain received data.
The following describes the communication method of the present embodiment with the number of slot numbers being 4 as an example.
When the number of the time slice serial numbers is 4 and the number of the serial number bits is 2 according to the relation between the number of the time slice serial numbers and the number of the serial number bits. So the number of bits in the transmitted data bit sequence is 3 and the modulation bit is 1. 4 combinations, namely 00, 01, 10 and 11, are available based on 2 sequence number bits, and the sequence number bit combinations are one-to-one corresponding to different time slices.
Specifically, binary phase modulation is performed on 1 modulation bit, and sequence number bit modulation is performed by mapping 2 sequence number bits to 1 time slice sequence number in 4 time slices. For example, since the transmission bit is "010", the sequence number bit "10" maps to the time slice of sequence number "3", and the modulation bit "0" is transmitted in the time slice of sequence number 3. There are 8 signals of 000, 010, …, 111, etc. all possible transmitted signals when transmitted, and the estimated transmitted signal is determined by using the criterion based on the maximum likelihood.
The embodiment provides a power transmission line high-speed communication method based on serial number modulation, which comprises the steps of dividing transmission time into a plurality of time slices, and labeling different serial numbers for each time slice; performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit; respectively modulating and mapping to corresponding time slices; generating a sending signal according to the time slice sequence number, transmitting the sending signal through a power transmission line, and demodulating the sending signal to obtain a restored modulation bit and a restored sequence number bit; and finally performing parallel/serial conversion, thereby obtaining received data. In the embodiment, the extra sequence number bits are sent through the time slice sequence numbers of the power transmission line communication system, and the influence of the serious multipath effect of the power transmission line transmission channel can be effectively avoided by adjusting the time slice number, so that the reliable power communication with high speed and high energy efficiency is realized.
The above is a detailed description of an embodiment of the power transmission line high-rate communication method based on serial number modulation of the present invention, and the following is a detailed description of an embodiment of the power transmission line high-rate communication system based on serial number modulation of the present invention.
Referring to fig. 2, the present embodiment provides a serial number modulation-based high-speed communication system for a power transmission line, including: the power communication system comprises a sending node and a receiving node, wherein the sending node and the receiving node represent nodes with communication functions in the power communication system. In this embodiment, the sending node and the receiving node are pluggable devices in practical application, including a computer, a set-top box, a monitoring device, an audio device, and other intelligent electrical devices.
In this embodiment, the sending node is configured to divide the transmission time into a plurality of slots, and label each slot with a different sequence number; performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit; modulating the modulation bit and the serial number bit respectively and mapping to a corresponding time slice; generating a sending signal according to the time slice sequence number and transmitting the sending signal through a power transmission line, wherein the sending node obtains a modulation bit and a sequence number bit, and specifically comprises the following steps:
dividing the sending data on the power transmission line into a plurality of groups of data bit sequences, wherein the number of the data bit sequences in each group is p;
and performing serial/parallel conversion on each group of data bit sequences to obtain 1 modulation bit and p-1 serial number bits.
Further, the sending node respectively modulates the modulation bits and the sequence number bits and then maps the modulated bits and the sequence number bits to corresponding time slices, specifically:
for each group of data bit sequences, carrying out serial number modulation on p-1 serial number bits, mapping to time slices of corresponding serial numbers, wherein the serial numbers of the time slices correspond to the serial number bit sequences one by one;
and carrying out binary phase modulation on the 1 modulation bit, and mapping the 1 modulation bit to a time slice corresponding to the p-1 serial numbers.
Further, the number of sequence numbers of the time slices and the number of sequence number bits conform to the following relationship:
wherein q is the number of serial number bitsN is the number of the time slices, C (N,1) represents a binomial coefficient,
representing a floor function.
In this embodiment, the receiving node is configured to demodulate a transmitted transmission signal as a received signal to obtain a recovered modulation bit and a sequence number bit; and carrying out parallel/serial conversion on the restored modulation bits and serial number bits so as to obtain received data.
The receiving node demodulates the transmitted transmission signal as a received signal based on the maximum likelihood criterion, and performs demodulation processing based on the maximum likelihood criterion according to the following formula:
s (t) max { | y (t) -hs i (t)| 2 }
Wherein s (t) represents an estimated transmission signal, y (t) represents the reception signal, h represents a channel coefficient of a power line channel, and s i (t) transmission signals corresponding to i possible transmission bit combinations.
It should be noted that, the communication system provided in this embodiment is used to implement the communication method provided in the foregoing embodiment, and the specific setting of each node is subject to complete implementation of the method, which is not described herein again.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A power transmission line high-speed communication method based on serial number modulation is characterized by comprising the following steps:
dividing the transmission time into a plurality of time slices, and labeling different serial numbers for each time slice;
performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit;
respectively modulating the modulation bit and the serial number bit and then mapping the modulated bits and the serial number bit to corresponding time slices;
generating a sending signal according to the time slice sequence number and transmitting the sending signal through the power transmission line;
demodulating the transmitted sending signal as a receiving signal to obtain the restored modulation bit and the sequence number bit;
and carrying out parallel/serial conversion on the restored modulation bit and the serial number bit so as to obtain received data.
2. The power transmission line high-rate communication method based on serial number modulation according to claim 1, wherein the serial/parallel conversion is performed on the transmission data on the power transmission line to obtain the modulation bit and the serial number bit, specifically:
dividing the sending data on the power transmission line into a plurality of groups of data bit sequences, wherein the number of the data bit sequences in each group is p;
and performing serial/parallel conversion on each group of data bit sequences to obtain 1 modulation bit and p-1 serial number bits.
3. The power transmission line high-rate communication method based on serial number modulation according to claim 2, wherein the modulation bits and the serial number bits are respectively modulated and mapped to corresponding time slices, specifically:
for each group of data bit sequences, carrying out sequence number modulation on the p-1 sequence number bits, and mapping to a time slice with a corresponding sequence number, wherein the sequence number of the time slice corresponds to the sequence of the sequence number bits one to one;
and carrying out binary phase modulation on the 1 modulation bit, and mapping the 1 modulation bit to a time slice corresponding to the p-1 serial numbers.
4. A method according to claim 3, wherein the number of time slices and the number of bits of the sequence number are in accordance with the following relationship:
wherein q is the number of the sequence bits, N is the number of the sequence bits, C (N,1) represents a binomial coefficient,
representing a floor function.
5. The serial number modulation-based power transmission line high-rate communication method according to claim 1, wherein demodulation processing is performed on the transmitted signal as a received signal using a maximum likelihood criterion based on the following formula:
s (t) max { | y (t) -hs i (t)| 2 }
Wherein s (t) represents an estimated transmission signal, y (t) represents the reception signal, h represents a channel coefficient of a power line channel, and s i (t) corresponding to the i possible combinations of transmission bits.
6. A power transmission line high rate communication system based on serial number modulation, comprising: a transmitting node and a receiving node;
the transmitting node is used for dividing the transmission time into a plurality of time slices and marking different serial numbers for each time slice; performing serial/parallel conversion on transmission data on a power transmission line to obtain a modulation bit and a serial number bit; respectively modulating the modulation bit and the serial number bit and then mapping the modulated bits and the serial number bit to corresponding time slices; generating a sending signal according to the time slice sequence number and transmitting the sending signal through the power transmission line;
the receiving node is configured to demodulate the transmitted sending signal as a receiving signal to obtain the restored modulation bit and the sequence number bit; and carrying out parallel/serial conversion on the restored modulation bit and the serial number bit so as to obtain received data.
7. The serial number modulation-based power transmission line high-rate communication system according to claim 6, wherein the specific process for the sending node to obtain the modulation bit and the serial number bit is as follows:
dividing the sending data on the power transmission line into a plurality of groups of data bit sequences, wherein the number of the data bit sequences in each group is p;
and performing serial/parallel conversion on each group of data bit sequences to obtain 1 modulation bit and p-1 serial number bits.
8. The serial number modulation-based power transmission line high-rate communication system according to claim 7, wherein the transmitting node modulates the modulation bits and the serial number bits respectively and maps the modulated bits and the serial number bits to corresponding time slices, specifically:
for each group of data bit sequences, carrying out sequence number modulation on the p-1 sequence number bits, and mapping to a time slice with a corresponding sequence number, wherein the sequence number of the time slice corresponds to the sequence of the sequence number bits one to one;
and carrying out binary phase modulation on the 1 modulation bit, and mapping the 1 modulation bit to a time slice corresponding to the p-1 serial numbers.
9. A power transmission line high rate communication system according to claim 8 wherein the number of time slices and the number of sequence number bits conform to the following relationship:
wherein q is the number of the sequence bits, N is the number of the time slices, C (N,1) represents a binomial coefficient,
representing a floor function.
10. The serial number modulation-based power transmission line high-rate communication system according to claim 6, wherein the receiving node demodulates the transmitted transmission signal as a received signal using a maximum likelihood criterion based on the following formula:
s (t) max { | y (t) -hs i (t)| 2 }
Wherein s (t) represents an estimated transmission signal, y (t) represents the reception signal, h represents a channel coefficient of a power line channel, and s i (t) corresponding to the i possible combinations of transmission bits.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117478175A (en) * | 2023-10-25 | 2024-01-30 | 中通服网盈科技有限公司 | Power communication transmission optimization system and operation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117478175A (en) * | 2023-10-25 | 2024-01-30 | 中通服网盈科技有限公司 | Power communication transmission optimization system and operation method |
| CN117478175B (en) * | 2023-10-25 | 2024-04-30 | 中通服网盈科技有限公司 | Power communication transmission optimization system and operation method |
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