CN103391165A - Data transmitting method, receiving method and corresponding device for power line carrier communication - Google Patents
Data transmitting method, receiving method and corresponding device for power line carrier communication Download PDFInfo
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Abstract
The invention provides a data transmitting method, a receiving method and a corresponding device for power line carrier communication, and belongs to the field of the power line carrier communication. The data transmitting method comprises the steps as follows: to-be-transmitted data are encoded; and in one data transmitting period, encoded data of the same byte are transmitted redundantly through at least three data transmission time slots respectively. Therefore, interference of periodic pulse noise to the power line carrier communication is effectively avoided. According to the data transmitting method, the receiving method and the corresponding device for the power line carrier communication, the data are encoded, the same byte is redundantly transmitted for at least three times in one data transmitting period, and corresponding decoding and checking to data flows are performed after the data are received. Therefore, when the data are transmitted, at least one effective signal cannot be covered with the periodic pulse noise always, so that the problems that the power line carrier communication can be interfered easily and the communication performance is poor are effectively solved.
Description
Technical field
The present invention relates to the communications field, in particular to data transmission method for uplink, method of reseptance and the related device of power line carrier, PLC.
Background technology
Electric power carrier communication technology refers to utilize the power line in electric power networks to carry out a kind of communication mode of cable data transmission as transmission medium.For existing power line carrier, PLC, the transfer of data implementation adopts communications field continuous data sending mode commonly used, and coded system is continuation character string encoding pattern, therefore shows that the carrier signal of transmitting on power circuit is continuous signal.But because domestic power grid environment is comparatively complicated, domestic electrical equipment is larger to the noise of electrical network radiation feedback.Like this, existing power line carrier, PLC mode easily is interfered, and communication performance is poor.
Summary of the invention
The data transmission method that the purpose of this invention is to provide a kind of power line carrier, PLC, be intended to solve existing power line carrier, PLC and easily be interfered, the communication performance poor.
The present invention is achieved in that a kind of data transmission method for uplink of power line carrier, PLC, and described data transmission method for uplink comprises the following steps:
Data to be sent are encoded;
In a data transmitting period, for the same byte data after coding, by the redundancy transmission respectively of at least 3 transfer of data time slots.
Further, the described step that data to be sent are encoded comprises:
By convolutional encoding, the byte code of 8bits is become the data flow of 20bits.
Another purpose of the embodiment of the present invention is to provide a kind of data receive method of power line carrier, PLC, and described data receive method comprises the following steps:
In a data transmitting period, receive the same byte that sends by at least 3 transfer of data time slots difference redundancies;
The byte that receives is decoded;
Decoded byte is carried out verification, and according to a decoded data that conduct correctly receives at least 3 bytes of check results selection.
Further, the described step that the byte that receives is decoded comprises:
Respectively the described same byte that sends by at least 3 transfer of data time slot redundancies is decoded;
At least 3 same bytes for the redundancy that receives sends, split two parts with each byte by same way as, and the second portion of the first of each byte and another byte reassembled into new byte;
Byte after restructuring is decoded respectively.
Further, described decoded byte is carried out verification, and according to check results, selects the step of the decoded data that a conduct at least 3 bytes correctly receives to comprise:
Decoded all bytes are contrasted one by one, judge whether two above bytes that exist numerical value identical, if exist, the byte that numerical value is identical is as the decoded data that correctly receives;
If there is no, the solution code error step-length that decoded all bytes are corresponding compares, and chooses byte corresponding to minimum solution code error step-length as the decoded data that correctly receives.
Another purpose of the embodiment of the present invention is to provide a kind of data sending device of power line carrier, PLC, and described data sending device comprises:
Coding module, be used for data to be sent are encoded;
The data redundancy sending module, be used in a data transmitting period, for the same byte data after coding, by the redundancy transmission respectively of at least 3 transfer of data time slots.
Further, described coding module comprises:
The convolutional encoding module, be used for by convolutional encoding, the byte code of 8bits being become the data flow of 20bits.
Another purpose of the embodiment of the present invention is to provide a kind of data sink of power line carrier, PLC, and described data sink comprises:
The redundant data receiver module, be used in a data transmitting period, receives the same byte that sends by at least 3 transfer of data time slots difference redundancies;
Decoder module, be used for the byte that receives is decoded;
The data check module, be used for decoded byte is carried out verification, and according to a decoded data that conduct correctly receives at least 3 bytes of check results selection.
Further, described decoder module comprises:
The redundant data decoder module, be used for respectively the described same byte that sends by at least 3 transfer of data time slot redundancies being decoded;
The byte recombination module, be used at least 3 same bytes that send for the redundancy that receives, and each byte split two parts by same way as, and the second portion of the first of each byte and another byte is reassembled into new byte;
Restructuring byte decoder module, be used for the byte after restructuring is decoded respectively.
Further, described data check module comprises:
Byte contrast module, be used for decoded all bytes are contrasted one by one, judges whether two above bytes that exist numerical value identical, if exist, the byte that numerical value is identical, as the decoded data that correctly receives, if there is no, is called and is separated code error step-length contrast module;
Separate code error step-length contrast module, be used for the solution code error step-length that decoded all bytes are corresponding and compare, choose byte corresponding to minimum solution code error step-length as the decoded data that correctly receives.
In the present invention, data are encoded, redundancy sends same byte at least 3 times in a data transmitting period, after data receiver, then data stream is carried out corresponding decoding, verification.Like this, data are when transmission, and the recurrent pulses noise always can't cover at least one useful signal, easily be interfered thereby effectively solved power line carrier, PLC, and the problem that communication performance is poor.
Description of drawings
Fig. 1 is that in the power line carrier, PLC that provides of the embodiment of the present invention, recurrent pulse is disturbed schematic diagram;
Fig. 2 is the flow chart of the data transmission method for uplink of the power line carrier, PLC that provides of the embodiment of the present invention;
Fig. 3 is the flow chart that data with to be sent that the embodiment of the present invention provides are encoded;
Fig. 4 is that the data that the embodiment of the present invention provides send the waveform schematic diagram;
Fig. 5 is the flow chart of the data receive method of the power line carrier, PLC that provides of the embodiment of the present invention;
Fig. 6 is the flow chart that the byte to receiving that the embodiment of the present invention provides is decoded;
Fig. 7 is the flow chart that decoded byte is carried out verification that the embodiment of the present invention provides;
Fig. 8 is the data sending device of the power line carrier, PLC that provides of the embodiment of the present invention and the structural representation of data sink.
Embodiment
Also by reference to the accompanying drawings the present invention is described in further detail below by specific embodiment.
By the research to domestic power grid environment, and to domestic typical power utilization environment (comprising that the cities and towns of high rise elevator apartment, the combination area of city and country, outlying rural area etc. are different local), the different periods are carried out noise samples, find ubiquity recurrent pulse interference noise on power circuit, specifically see also Fig. 1.
As can be seen from Figure 1, on power line, exist discrete periodic interference signals in each electric power signal half wave cycles, power line data transmission is produced and has a strong impact on.
, based on this, in the process of power line carrier, PLC transfer of data, just can consider the anti-recurrent pulse interference of power line data transmission design.The present invention, according to the power line carrier, PLC actual demand, has proposed the data transmission method that a kind of anti-recurrent pulse that is practically applicable to power line carrier, PLC is disturbed, and comprises data transmission method for uplink and data receive method.
Fig. 2 shows the flow process of the data transmission method for uplink of the power line carrier, PLC that the embodiment of the present invention provides, and details are as follows:
In step S101, data to be sent are encoded.
In step S102, in a data transmitting period, for the same byte data after coding, by the redundancy transmission respectively of at least 3 transfer of data time slots.
The flow process that the data with to be sent that Fig. 3 shows the embodiment of the present invention to be provided are encoded, details are as follows:
In step S1011, by convolutional encoding, the byte code of 8bits to be sent is become the data flow of 20bits.
In step S1012, the data flow after convolutional encoding is carried out interweaving encoding.
In electrical network, the electric power signal that transmits on power line is 220V at home, the AC signal of 50Hz, so the electric power signal cycle be 20ms.
As embodiments of the invention, half of data transmitting period power taking force signal cycle duration of the present invention, be 10ms.In this data transmitting period, the 10ms time is carried out 3 grades again divide transfer of data time slot as a byte data, so the transfer of data time slot of each byte is 3.3ms.
The corresponding binary system of byte data is 8bits, can the corresponding data flow N that generates 20bits by convolutional encoding.The pattern of traffic of N is:
N1，N2，N3，N4，N5，N6，N7，N8，N9，N10，N11，N12，N13，N14，N15，N16，N17，N18，N19，N20。
In order to reach better jamming-proof purpose, the data flow of 20bits is carried out interweaving encoding in such a way form NN, the pattern of data flow NN is after the conversion that interweaves:
N1，N6，N11，N16，N2，N7，N12，N17，N3，N8，N13，N18，N4，N9，N14，N19，N5，N10，N15，N20。
In the present invention, bit rate is set as 10kbps, and the time of NN data flow transmission is: T=20*t=20* (1/10kbps)=2ms.
Therefore, each data sending time slots of mentioning hereinbefore meets the demands less than 3.3ms.Simultaneously, in three time slots of 10ms decile, the data waveform of transmission is in full accord, realizes sending same byte data in interior 3 the time slot redundancies of an electric power signal half wave cycles (10ms).
Certainly, a data transmitting period can be divided into more data sending time slots (for example, 4), and redundancy repeatedly sends same byte data (each data sending time slots sends once).As embodiments of the invention, this coded system also can adopt the block encoding mode.
Data send waveform such as Fig. 4, and as can be seen from the figure, top figure is the electric power signal schematic diagram, and middle figure is that recurrent pulse is disturbed schematic diagram, and following figure is that data send waveform.Can find out, when periodic noise disturbs in the enterprising line slip of time shaft, always can't cover the useful signal in the transmission cycle.
Fig. 5 shows the flow process of the data receive method of the power line carrier, PLC that the embodiment of the present invention provides, and details are as follows:
In step S201, in a data transmitting period, receive the same byte that sends by at least 3 transfer of data time slots difference redundancies.
In step S202, the byte that receives is decoded.
In step S203, decoded byte is carried out verification, and according to a decoded data that conduct correctly receives at least 3 bytes of check results selection.
The flow process that the byte to receiving that Fig. 6 shows the embodiment of the present invention to be provided is decoded, details are as follows:
In step S2021, respectively the described same byte that sends by at least 3 transfer of data time slot redundancies is decoded.
In step S2022, at least 3 same bytes for the redundancy that receives sends, split two parts with each byte by same way as, and the second portion of the first of each byte and another byte reassembled into new byte.
In step S2023, the byte after restructuring is decoded respectively.
The flow process that decoded byte is carried out verification that Fig. 7 shows that the embodiment of the present invention provides, details are as follows:
In step S2031, decoded all bytes are contrasted one by one.
In step S2032, judge whether two above bytes that exist numerical value identical.If exist, perform step S2033, otherwise execution step S2034.
In step S2033, the byte that numerical value is identical is as the decoded data that correctly receives.
In step S2034, if there is no, the solution code error step-length that decoded all bytes are corresponding compares, and chooses byte corresponding to minimum solution code error step-length as the decoded data that correctly receives.
, as embodiments of the invention,, at receiving terminal, take the viterbi(Viterbi) decoding process, but be the simple single byte decoding schema of taking, but take repeatedly iterative decoding pattern to carry out.
20bits data flow after the tentation data transmitting terminal sends within the transmission cycle of 10ms byte data coding is A, carrying out 3 circulations sends, although the data that send in 3 time slots are in full accord, but in order to distinguish the difference of time, we are A1 with the data flow token of three transmissions, A2, A3, each of three secondary data streams can be characterized by A1 (1:20), A2 (1:20), A3 (1:20) so.At data receiver, we will be not only to A1 (1:20), A2 (1:20), and three data streams of A3 (1:20) are decoded and are obtained three byte datas, are respectively B1, B2, B3.
Simultaneously, also need the A1 that will receive (1:20), A2 (1:20), A3 (1:20) data flow is reset, and then decoding is reassembled into 3 new data flow with it and is respectively:
A4(1:20)=[A1(1:10)，A3(11:20)]
A5(1:20)=[A2(1:10)，A1(11:20)]
A6(1:20)=[A3(1:10)，A2(11:20)]
To A4, A5, A6 decode and obtain equally 3 byte datas, are respectively B4, B5, B6.
By to B1, B2, B3, B4, B5, the data of six bytes of B6 are carried out verification, obtain the byte number of maximum probability as the decoded data that correctly receives, thereby efficiently solve the field difficult problem of the ubiquitous periodic interference signals of power line network to the power line carrier, PLC hydraulic performance decline.
Concrete checking procedure is: with B1, B2, B3, B4, B5, six bytes of B6 contrast one by one whether exist two and above byte numerical value identical, if exist think that this byte numerical value is as the decoded data that correctly receives, if there is no, six solution code error step-lengths corresponding to byte data are compared, choose byte numerical value corresponding to minimum solution code error step-length as the decoded data that correctly receives.
Fig. 8 shows the data sending device 1 of the power line carrier, PLC that the embodiment of the present invention provides and the structure of data sink 2.
This data sending device 1 comprises: coding module 11 and data redundancy sending module 12.This coding module 11 is encoded data to be sent, and this data redundancy sending module 12 is in a data transmitting period, for the same byte data after coding, by the redundancy transmission respectively of at least 3 transfer of data time slots.
In an embodiment of the present invention, this coding module 11 also comprises: convolutional encoding module 111, this convolutional encoding module 111 become the byte code of 8bits by the convolutional encoding mode data flow of 20bits.In order to reach better anti-tampering, as embodiments of the invention, described coding module also comprises: interweaving encoding module 112, the data flow after 112 pairs of convolutional encodings of this interweaving encoding module is carried out interweaving encoding.
As another embodiment of the present invention, this coding module 11 also can take the mode of block encoding to encode to byte.
The data sink of this power line carrier, PLC comprises: redundant data receiver module 21, decoder module 22 and data check module 23.
This redundant data receiver module 21 in a data transmitting period, receives the same byte that sends by at least 3 transfer of data time slots difference redundancies; 22 pairs of bytes that receive of decoder module are decoded; 23 pairs of decoded bytes of data check module are carried out verification, and according to a decoded data that conduct correctly receives at least 3 bytes of check results selection.
In an embodiment of the present invention, described decoder module 22 further comprises: redundant data decoder module 221, byte recombination module 222 and restructuring byte decoder module 223.Concrete decode procedure is: redundant data decoder module 221 is decoded to the described same byte that sends by at least 3 transfer of data time slot redundancies respectively; At least 3 same bytes that byte recombination module 222 sends for the redundancy that receives, split two parts with each byte by same way as, and the second portion of the first of each byte and another byte reassembled into new byte; Byte after 223 pairs of restructuring of restructuring byte decoder module is decoded respectively.
In an embodiment of the present invention, described data check module 23 further comprises: byte contrast module 231 and solution code error step-length contrast module 232.Concrete checking procedure is: 231 pairs of decoded all bytes of byte contrast module contrast one by one, judge whether two above bytes that exist numerical value identical, if exist, the byte that numerical value is identical is as the decoded data that correctly receives, if there is no, call and separate code error step-length contrast module.Separate the code error step-length contrast module 232 solution code error step-length that decoded all bytes are corresponding and compare, choose byte corresponding to minimum solution code error step-length as the decoded data that correctly receives.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. the data transmission method for uplink of a power line carrier, PLC, is characterized in that, described data transmission method for uplink comprises the following steps:
Data to be sent are encoded;
In a data transmitting period, for the same byte data after coding, by the redundancy transmission respectively of at least 3 transfer of data time slots.
2. the data transmission method for uplink of power line carrier, PLC according to claim 1, is characterized in that, the described step that data to be sent are encoded comprises:
By convolutional encoding, the byte code of 8bits is become the data flow of 20bits.
3. the data receive method of a power line carrier, PLC, is characterized in that, described data receive method comprises the following steps:
In a data transmitting period, receive the same byte that sends by at least 3 transfer of data time slots difference redundancies;
The byte that receives is decoded;
Decoded byte is carried out verification, and according to a decoded data that conduct correctly receives at least 3 bytes of check results selection.
4. the data receive method of power line carrier, PLC according to claim 3, is characterized in that, the described step that the byte that receives is decoded comprises:
Respectively the described same byte that sends by at least 3 transfer of data time slot redundancies is decoded;
At least 3 same bytes for the redundancy that receives sends, split two parts with each byte by same way as, and the second portion of the first of each byte and another byte reassembled into new byte;
Byte after restructuring is decoded respectively.
5. the data receive method of power line carrier, PLC according to claim 4, is characterized in that, described decoded byte carried out verification, and according to check results, select the step of the decoded data that a conduct at least 3 bytes correctly receives to comprise:
Decoded all bytes are contrasted one by one, judge whether two above bytes that exist numerical value identical, if exist, the byte that numerical value is identical is as the decoded data that correctly receives;
If there is no, the solution code error step-length that decoded all bytes are corresponding compares, and chooses byte corresponding to minimum solution code error step-length as the decoded data that correctly receives.
6. the data sending device of a power line carrier, PLC, is characterized in that, described data sending device comprises:
Coding module, be used for data to be sent are encoded;
The data redundancy sending module, be used in a data transmitting period, for the same byte data after coding, by the redundancy transmission respectively of at least 3 transfer of data time slots.
7. the data sending device of power line carrier, PLC according to claim 6, is characterized in that, described coding module comprises:
The convolutional encoding module, be used for by convolutional encoding, the byte code of 8bits being become the data flow of 20bits.
8. the data sink of a power line carrier, PLC, is characterized in that, described data sink comprises:
The redundant data receiver module, be used in a data transmitting period, receives the same byte that sends by at least 3 transfer of data time slots difference redundancies;
Decoder module, be used for the byte that receives is decoded;
The data check module, be used for decoded byte is carried out verification, and according to a decoded data that conduct correctly receives at least 3 bytes of check results selection.
9. the data sink of power line carrier, PLC according to claim 8, is characterized in that, described decoder module comprises:
The redundant data decoder module, be used for respectively the described same byte that sends by at least 3 transfer of data time slot redundancies being decoded;
The byte recombination module, be used at least 3 same bytes that send for the redundancy that receives, and each byte split two parts by same way as, and the second portion of the first of each byte and another byte is reassembled into new byte;
Restructuring byte decoder module, be used for the byte after restructuring is decoded respectively.
10. the data sink of power line carrier, PLC according to claim 8, is characterized in that, described data check module comprises:
Byte contrast module, be used for decoded all bytes are contrasted one by one, judges whether two above bytes that exist numerical value identical, if exist, the byte that numerical value is identical, as the decoded data that correctly receives, if there is no, is called and is separated code error step-length contrast module;
Separate code error step-length contrast module, be used for the solution code error step-length that decoded all bytes are corresponding and compare, choose byte corresponding to minimum solution code error step-length as the decoded data that correctly receives.
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