CN107040285A - The transmission method of power carrier data in a kind of Internet of Things - Google Patents
The transmission method of power carrier data in a kind of Internet of Things Download PDFInfo
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- CN107040285A CN107040285A CN201710343185.XA CN201710343185A CN107040285A CN 107040285 A CN107040285 A CN 107040285A CN 201710343185 A CN201710343185 A CN 201710343185A CN 107040285 A CN107040285 A CN 107040285A
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Classifications
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
- H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5404—Methods of transmitting or receiving signals via power distribution lines
- H04B2203/5412—Methods of transmitting or receiving signals via power distribution lines by modofying wave form of the power source
Abstract
The invention discloses a kind of transmission method of power carrier data in Internet of Things, this method comprises the following steps：S1., multiple carrier data transmitting terminals and carrier data receiving terminal are set between multiple power equipments；S2. carrier signal is generated carrier data by carrier data transmitting terminal, and is encrypted；S3. carrier data is amplified or attenuation processing；S4. corresponding carrier data receiving terminal is given by carrier wave data transmission；Wherein in S2, before generation carrier data encryption, denoising is carried out to carrier signal.This method can set up Internet of Things using power line, realize the Economic Communication between power equipment, and can guarantee that the reliability of the transmission of data.
Description
Art
The present invention relates to electric power carrier communication technology, and in particular to the transmission side of power carrier data in a kind of Internet of Things
Method.
Background technology
At present, electricity is used throughout huge numbers of families, but how to realize the wisdom management of household electric, is government department and phase
The problem of shutout business needs to consider.It is good a thinking and approach to solve this problem by Internet of Things, but right at present
In wisdom electric power Internet of things system research also in the initial development stage, study less.
Power carrier is the distinctive communication mode of power system, power carrier communication (Power line
Communication, PLC) refer to utilize existing power line, analog or digital signal is carried out by high-speed transfer by carrier system
Technology.In recent years, broadband power line carrier communication (BPLC：Broadband Power Line Carrier) technology obtains
Extensive use, is especially widely used in the fields such as intelligent grid kilowatt meter reading-out system, energy internet, smart home and industrial data collection
Scape.
Power line carrier communication network network has the advantages that, without wiring, network establishment charges can be greatly reduced.But power line
Network is not a kind of reliable communications carrier, first, and power line can cause strong decay, this decay width to signal of communication
Time variation is spent very strong, depending on signal frequency, network topology, load appliance etc..Signal of communication is passed in power line communication channel
There is fade-out in broadcasting, can vary widely and rise and fall in the signal intensity of receiver inlet, communication system is received
Power very big influence.This needs to design input voltage range big automatic gain control circuit as far as possible.
But, because power line and power equipment are generally within open air, power line carrier signal transmission environment is badly changeable,
Medium-voltage carrier signal is caused easily to be introduced noise by the influence of surrounding enviroment during transmission, the noise of addition is to letter
Number transmission quality has very big interference.In order to reduce influence of the noise to medium-voltage carrier signal, it usually needs carrier signal is entered
Row denoising.
The content of the invention
The present invention provides a kind of transmission method of power carrier data in Internet of Things, and this method can be set up using power line
Internet of Things, realizes the Economic Communication between power equipment, and can guarantee that the reliability of the transmission of data.
To achieve these goals, the present invention provides a kind of transmission method of power carrier data in Internet of Things, this method
Comprise the following steps：
S1., multiple carrier data transmitting terminals and carrier data receiving terminal are set between multiple power equipments；
S2. carrier signal is generated carrier data by carrier data transmitting terminal, and is encrypted；
S3. carrier data is amplified or attenuation processing；
S4. corresponding carrier data receiving terminal is given by carrier wave data transmission；
Wherein in S2, before generation carrier data encryption, denoising is carried out to carrier signal in the following way：
Medium pressure carrier signal is sampled by channel isolation digital storage oscilloscope, N number of sampled point letter is obtained
Number；
Select two or more wavelet basis；
N number of sampled point signal is decomposed with every kind of wavelet basis respectively, obtains corresponding with every kind of wavelet basis
The time domain beamformer of original signal and the time domain waveform of noise signal；
The time domain beamformer of the original signal corresponding to every kind of wavelet basis and the time domain waveform of noise signal are entered respectively
Line frequency analysis of spectrum, obtains the signal to noise ratio corresponding with wavelet basis；
Compare the size of the corresponding signal to noise ratio of every kind of wavelet basis；
Optimal wavelet bases are used as using signal to noise ratio highest wavelet basis；
Denoising is carried out to carrier signal using Optimal wavelet bases.
It is preferred that, N number of sampled point signal is decomposed with every kind of wavelet basis respectively, obtained and every kind of wavelet basis phase
The time domain beamformer of corresponding original signal and the time domain waveform of noise signal, are specifically included：
N number of sampled point signal is decomposed by wavelet basis of db2, obtain the original signal corresponding with db2 when
The time domain waveform of domain waveform figure and noise signal；
N number of sampled point signal is decomposed by wavelet basis of haar, the original signal corresponding with haar is obtained
The time domain waveform of time domain beamformer and noise signal；
N number of sampled point signal is decomposed by wavelet basis of sym6, the original signal corresponding with sym6 is obtained
The time domain waveform of time domain beamformer and noise signal.
It is preferred that, the step S3 includes following sub-step：
Step S31：Obtain the amplitude of carrier data；
Step S32：The zero cross signal of carrier data is extracted, and to the carrier data segment processing, obtained null range
Null range is crossed with non-；
Step S33：The amplitude is calculated respectively crosses the corresponding zero passage region gain value of null range and the non-mistake described
The corresponding non-zero passage region gain value of null range；The zero passage region gain value and non-null range of crossing are increased using windowing process method
Beneficial value progress, which is handled, obtains target gain controlling value,
Step S34：The target gain controlling value according to obtaining is amplified or decayed to the carrier data.
It is preferred that, in the step S2, segmentation load is carried out to the carrier data of generation according to user key and AES
Ripple data encryption, the divided carrier data after being encrypted
It is preferred that, in the S2, specifically include following sub-step：
S21：Divided carrier data, user key and the first random digital signal are subjected to bit arithmetic, the first ciphertext is obtained
Data signal；
S22：Bit arithmetic is carried out according to user key and the first random digital signal, the second random digital signal is obtained；
S23：Second random digital signal is inserted into the first ciphertext data signal, the second ciphertext data signal is obtained；
S24：Inverted bit bit manipulation, the divided carrier number after finally being encrypted are carried out to the second ciphertext data signal
According to.
It is preferred that, in the step S4, specifically include following steps：
S41. the carrier data after increase or decay is received, wherein carrier data sending port is carried in the carrier data
Information；
S42. the port information carried according to the carrier data, it is determined that the carrier wave corresponding with carrier data transmitting terminal
Data receiver；
S43. the carrier data is transmitted to the corresponding carrier data receiving terminal.
It is preferred that, in S4, before transmission carrier data, multiple carrier data transmitting terminals and multiple loads are set
One-to-one relationship between ripple data receiver, specifically for by default port-pairing agreement, setting multiple loads
The one-to-one relationship of ripple data sending terminal and multiple carrier data receiving terminals；Or, joined according to the port-pairing of reception
Number, sets the one-to-one relationship between multiple carrier data transmitting terminals and multiple carrier data receiving terminals.
The present invention has advantages below and beneficial effect：(1) present invention by carrier data transmitting terminal be divided into null range and
It is non-to cross null range, the automatic growth control of different parameters is respectively adopted to control, and using adding window method to the critical of two regions
Region carries out adding window with smooth automatic gaining controling parameter., can be logical using power carrier to greatest extent by the above method
The characteristics of letter, improve carrier data control accuracy and real-time；(2) during carrier wave data transmission, closed with corresponding
The data channel of carrier data transmitting terminal and carrier data the receiving terminal composition of system, has the carrier wave of one-to-one relationship with other
It is completely isolated between the data channel of data sending terminal and carrier data receiving terminal so that the carrier wave of different types of power equipment
Data will not produce interference when being transmitted between different data channel；(3) during carrier wave data transmission, conciliate using encryption
Close mechanism, it can be ensured that the information security in electric power Internet of Things；(4) present invention will handle letter using wavelet basis denoising method
Number, it is utilized respectively different wavelet basis to decompose medium-voltage carrier signal, the reliability of data transfer is effectively ensured.
Brief description of the drawings
Fig. 1 shows a kind of block diagram of power carrier communication system applied to Internet of Things of the present invention.
Fig. 2 shows the flow chart of the transmission method of power carrier data in a kind of Internet of Things of the invention.
Embodiment
Fig. 1 is a kind of power carrier communication system applied to Internet of Things for showing the present invention, and the system includes carrier wave
Data sending terminal 1, carrier wave data transmission device 2, carrier communication transmitting device 3 and carrier data receiving terminal 4, the carrier data
Transmitting terminal and carrier data receiving terminal can be multiple；
Wherein, the carrier data transmitting terminal 1 includes：
Carrier data generation unit 11, for generating carrier data waiting for transmission；
DEU data encryption unit 12, carrier data waiting for transmission is encrypted using AES, waiting after being encrypted
The carrier data of transmission；
Data transmission unit 13, for the carrier data waiting for transmission after encryption to be sent into carrier data amplifying device；
The carrier data amplifying device 2 includes：
Amplitude acquisition module 21, the amplitude for obtaining the carrier data waiting for transmission after encryption；
Zero cross signal extraction module 22, the zero cross signal for extracting the carrier data waiting for transmission after encryption, and to institute
Zero cross signal segment processing is stated, null range and non-null range excessively was obtained；
Yield value calculates processing module 23, for calculating the amplitude respectively in the corresponding null range excessively of the null range excessively
Yield value and the corresponding non-zero passage region gain value of the non-null range excessively；Then null range is crossed to described using windowing process method
Yield value and non-zero passage region gain value progress handle and obtain target gain controlling value；
Gain amplification module 24, for according to the obtained target gain controlling value to waiting for transmission after the encryption
Carrier data is amplified or decayed.
The carrier communication transmitting device 3 includes：
Receiving module 31, for receiving the end that the carrier data and the carrier data of above-mentioned amplified or decay are carried
Message ceases；
Determining module 32, for the port information carried according to the carrier data, it is determined that with carrier data transmitting terminal pair
The carrier data receiving terminal answered；
Setup module 33, for setting between multiple carrier data transmitting terminals and multiple carrier data receiving terminals
One-to-one relationship, specifically for by default port-pairing agreement, setting multiple carrier data transmitting terminals and many
The one-to-one relationship of the individual carrier data receiving terminal；Or, according to the port-pairing parameter of reception, multiple loads are set
One-to-one relationship between ripple data sending terminal and multiple carrier data receiving terminals.
Transport module 34, for transmitting the carrier data to the corresponding carrier data receiving terminal；
The carrier data receiving terminal 4 includes：
Data receipt unit 41, the carrier data for receiving the transmission of carrier communication transmitting device；
Data decryption unit 42, for decrypting the carrier data received；
Data processing unit 43, is handled the signal after decryption.
It is preferred that, zero cross signal extraction module 22 is specifically included：
Extraction unit, for extracting the zero cross signal in carrier data；
Processing unit, for the carrier data segment processing, obtaining null range and non-null range excessively.
It is preferred that, the DEU data encryption unit 12 is carried out according to user key and AES to the carrier data of generation
Divided carrier data encryption, the divided carrier data after being encrypted.
It is preferred that, the DEU data encryption unit 12 includes：
First computing subelement, for being entered according to divided carrier data, the user key and the first random digital signal
Line position computing, obtains the first ciphertext data signal；
Second computing subelement, for carrying out bit arithmetic according to the user key and the first random digital signal, is obtained
Second random digital signal；
Subelement is inserted, for the second random digital signal to be inserted into the first ciphertext data signal, second is obtained close
Literary data signal；
First operation subelement, for carrying out inverted bit bit manipulation to the second ciphertext data signal, is finally encrypted
Divided carrier data afterwards.
It is preferred that, the data decryption unit 42 includes：
Second operation subelement, for carrying out bit reverse turn operation to the divided carrier data after final encryption, is obtained
4th ciphertext data signal；
Subelement is extracted, for extracting the second random digital signal from the 4th ciphertext data signal, the 5th is obtained close
Literary data signal；
3rd computing subelement, for carrying out bit arithmetic according to the second random digital signal and user key, obtains first
Random digital signal；
4th computing subelement, for being entered according to the 5th ciphertext data signal, the first random digital signal and user key
Line position computing, obtains former divided carrier data.
Fig. 2 shows a kind of flow chart of method that Internet of Things is built based on power line communication of the present invention.This method has
Body comprises the following steps：
S1., multiple carrier data transmitting terminals and carrier data receiving terminal are set between multiple power equipments；
S2. carrier signal is generated carrier data by carrier data transmitting terminal, and is encrypted；
S3. carrier data is amplified or attenuation processing；
S4. corresponding carrier data receiving terminal is given by carrier wave data transmission；
Wherein in S2, before generation carrier data encryption, denoising is carried out to carrier signal in the following way：
Medium pressure carrier signal is sampled by channel isolation digital storage oscilloscope, N number of sampled point letter is obtained
Number；
Select two or more wavelet basis；
N number of sampled point signal is decomposed with every kind of wavelet basis respectively, obtains corresponding with every kind of wavelet basis
The time domain beamformer of original signal and the time domain waveform of noise signal；
The time domain beamformer of the original signal corresponding to every kind of wavelet basis and the time domain waveform of noise signal are entered respectively
Line frequency analysis of spectrum, obtains the signal to noise ratio corresponding with wavelet basis；
Compare the size of the corresponding signal to noise ratio of every kind of wavelet basis；
Optimal wavelet bases are used as using signal to noise ratio highest wavelet basis；
Denoising is carried out to carrier signal using Optimal wavelet bases.
It is preferred that, N number of sampled point signal is decomposed with every kind of wavelet basis respectively, obtained and every kind of wavelet basis phase
The time domain beamformer of corresponding original signal and the time domain waveform of noise signal, are specifically included：
N number of sampled point signal is decomposed by wavelet basis of db2, obtain the original signal corresponding with db2 when
The time domain waveform of domain waveform figure and noise signal；
N number of sampled point signal is decomposed by wavelet basis of haar, the original signal corresponding with haar is obtained
The time domain waveform of time domain beamformer and noise signal；
N number of sampled point signal is decomposed by wavelet basis of sym6, the original signal corresponding with sym6 is obtained
The time domain waveform of time domain beamformer and noise signal.
It is preferred that, the step S3 includes following sub-step：
Step S31：Obtain the amplitude of carrier data；
Step S32：The zero cross signal of carrier data is extracted, and to the carrier data segment processing, obtained null range
Null range is crossed with non-；
Step S33：The amplitude is calculated respectively crosses the corresponding zero passage region gain value of null range and the non-mistake described
The corresponding non-zero passage region gain value of null range；The zero passage region gain value and non-null range of crossing are increased using windowing process method
Beneficial value progress, which is handled, obtains target gain controlling value,
Step S34：The target gain controlling value according to obtaining is amplified or decayed to the carrier data.
It is preferred that, in the step S2, segmentation load is carried out to the carrier data of generation according to user key and AES
Ripple data encryption, the divided carrier data after being encrypted
It is preferred that, in the S2, specifically include following sub-step：
S21：Divided carrier data, user key and the first random digital signal are subjected to bit arithmetic, the first ciphertext is obtained
Data signal.
Divided carrier data first can carry out bit arithmetic (such as XOR) with the first random digital signal and obtain the 3rd
Ciphertext, then allows the 3rd ciphertext to carry out bit arithmetic (such as XOR) with user key and obtains the first ciphertext data signal again.
Certain divided carrier data first can also carry out bit arithmetic (such as XOR) with user key and obtain the 3rd ciphertext, Ran Houzai
Allow the 3rd ciphertext to carry out bit arithmetic (such as XOR) with the first random digital signal and obtain the first ciphertext data signal.Wherein
Specifically obtaining the first ciphertext data signal can be realized by following C language, c [i]=p [i] ^r [(i+a) %rl] ^k [(i+
B) %kl], wherein c represents the first ciphertext data signal, and i represents byte ordinal number, and p represents divided carrier data, r represent first with
Machine data signal, rl represents the first random digital signal length, and k represents user key, and kl represents user key length, and a is small
In the positive integer of the first random signal length, b is less than the positive integer of user key length.
S22：Bit arithmetic is carried out according to user key and the first random digital signal, the second random digital signal is obtained；
User key and the first random digital signal can be subjected to bit arithmetic (such as XOR), obtain second random
Data signal, and the length of second random digital signal is as the length of the first random digital signal.However, to ensure that
Data expansion is not very serious, and this length value is unsuitable excessive.
Can also by by each byte (except last byte) of the first random digital signal respectively with below
One byte carries out step-by-step XOR and obtains the second random digital signal.
S23：Second random digital signal is inserted into the first ciphertext data signal, the second ciphertext data signal is obtained.
S24：Inverted bit bit manipulation, the divided carrier number after finally being encrypted are carried out to the second ciphertext data signal
According to.
It is preferred that, in the step S4, specifically include following steps：
S41. the carrier data after increase or decay is received, wherein carrier data sending port is carried in the carrier data
Information；
S42. the port information carried according to the carrier data, it is determined that the carrier wave corresponding with carrier data transmitting terminal
Data receiver；
S43. the carrier data is transmitted to the corresponding carrier data receiving terminal.
It is preferred that, in S4, before transmission carrier data, multiple carrier data transmitting terminals and multiple loads are set
One-to-one relationship between ripple data receiver, specifically for by default port-pairing agreement, setting multiple loads
The one-to-one relationship of ripple data sending terminal and multiple carrier data receiving terminals；Or, joined according to the port-pairing of reception
Number, sets the one-to-one relationship between multiple carrier data transmitting terminals and multiple carrier data receiving terminals.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of transmission method of power carrier data in Internet of Things, this method comprises the following steps：
S1., multiple carrier data transmitting terminals and carrier data receiving terminal are set between multiple power equipments；
S2. carrier signal is generated carrier data by carrier data transmitting terminal, and is encrypted；
S3. carrier data is amplified or attenuation processing；
S4. corresponding carrier data receiving terminal is given by carrier wave data transmission；
Wherein in S2, before generation carrier data encryption, denoising is carried out to carrier signal in the following way：
Medium pressure carrier signal is sampled by channel isolation digital storage oscilloscope, N number of sampled point signal is obtained；
Select two or more wavelet basis；
N number of sampled point signal is decomposed with every kind of wavelet basis respectively, the former letter corresponding with every kind of wavelet basis is obtained
Number time domain beamformer and noise signal time domain waveform；
The time domain beamformer of the original signal corresponding to every kind of wavelet basis and the time domain waveform of noise signal enter line frequency respectively
Analysis of spectrum, obtains the signal to noise ratio corresponding with wavelet basis；
Compare the size of the corresponding signal to noise ratio of every kind of wavelet basis；
Optimal wavelet bases are used as using signal to noise ratio highest wavelet basis；
Denoising is carried out to carrier signal using Optimal wavelet bases.
2. the method as described in claim 1, it is characterised in that entered respectively to N number of sampled point signal with every kind of wavelet basis
Row is decomposed, and obtains the time domain beamformer of the original signal corresponding with every kind of wavelet basis and the time domain waveform of noise signal, specific bag
Include：
N number of sampled point signal is decomposed by wavelet basis of db2, the time domain ripple of the original signal corresponding with db2 is obtained
The time domain waveform of shape figure and noise signal；
N number of sampled point signal is decomposed by wavelet basis of haar, the time domain of the original signal corresponding with haar is obtained
The time domain waveform of oscillogram and noise signal；
N number of sampled point signal is decomposed by wavelet basis of sym6, the time domain of the original signal corresponding with sym6 is obtained
The time domain waveform of oscillogram and noise signal.
3. the method as described in claim 1, it is characterised in that the step S3 includes following sub-step：
Step S31：Obtain the amplitude of carrier data；
Step S32：The zero cross signal of carrier data is extracted, and to the carrier data segment processing, obtained null range and non-
Cross null range；
Step S33：The amplitude is calculated respectively crosses the corresponding zero passage region gain value of null range and the non-zero passage area described
The corresponding non-zero passage region gain value in domain；Using windowing process method to the zero passage region gain value and non-zero passage region gain value
Progress, which is handled, obtains target gain controlling value,
Step S34：The target gain controlling value according to obtaining is amplified or decayed to the carrier data.
4. method as claimed in claim 3, it is characterised in that in the step S2, according to user key and AES pair
The carrier data of generation carries out divided carrier data encryption, the divided carrier data after being encrypted.
5. the method as described in claim 1-4 is any, it is characterised in that in the S2, specifically includes following sub-step：
S21：Divided carrier data, user key and the first random digital signal are subjected to bit arithmetic, the first ciphertext numeral is obtained
Signal；
S22：Bit arithmetic is carried out according to user key and the first random digital signal, the second random digital signal is obtained；
S23：Second random digital signal is inserted into the first ciphertext data signal, the second ciphertext data signal is obtained；
S24：Inverted bit bit manipulation, the divided carrier data after finally being encrypted are carried out to the second ciphertext data signal.
6. the method as described in claim 1-4 is any, it is characterised in that in the step S4, specifically include following steps：
S41. the carrier data after increase or decay is received, carrier data transmitting terminal message is wherein carried in the carrier data
Breath；
S42. the port information carried according to the carrier data, it is determined that the carrier data corresponding with carrier data transmitting terminal
Receiving terminal；
S43. the carrier data is transmitted to the corresponding carrier data receiving terminal.
7. before method as claimed in claim 6, it is characterised in that in S4, transmission carrier data, multiple loads are set
One-to-one relationship between ripple data sending terminal and multiple carrier data receiving terminals, specifically for passing through default end
Mouth matchmaking protocol, sets the one-to-one relationship of multiple carrier data transmitting terminals and multiple carrier data receiving terminals；
Or, according to the port-pairing parameter of reception, set multiple carrier data transmitting terminals and multiple carrier datas to receive
One-to-one relationship between end.
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| 夏文文: ""一种改进小波阈值的电力线通信信号消噪方法"", 《电力系统及其自动化学报》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109039381A (en) * | 2018-08-29 | 2018-12-18 | 珠海泰易科技有限公司 | A kind of encryption method of the low-voltage power line bandwidth carrier communication for DL/T645 communications protocol |
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