CN204615911U - A kind of modem chip of low-voltage powerline carrier communication and device - Google Patents
A kind of modem chip of low-voltage powerline carrier communication and device Download PDFInfo
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- CN204615911U CN204615911U CN201520266248.2U CN201520266248U CN204615911U CN 204615911 U CN204615911 U CN 204615911U CN 201520266248 U CN201520266248 U CN 201520266248U CN 204615911 U CN204615911 U CN 204615911U
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Abstract
The utility model provides a kind of modem chip and device of low-voltage powerline carrier communication, described chip comprises: signalling to circuit, comprise successively be connected: scrambler module, RS coding module, convolutional encoder module, carrier modulation block, the first digital filtering module; Signal reception direction circuit, comprise successively be connected: the second digital filtering module, demodulation module, Viterbi decoder module, RS decoder module, descrambling module; And microcomputer system in sheet, be connected with described RS coding module, convolutional encoder module, carrier modulation block, demodulation module, Viterbi decoder module, RS decoder module respectively.The ustomer premises access equipment that the utility model built-in miniature computer system (ARM) device is low pressure power line communication system provides low cost, the high performance solution of monolithic.The RS coding module of indoor design cascade and convolutional encoder module, improve the accuracy rate of information transmission.
Description
Technical field
The utility model relates to communication technical field, particularly relates to a kind of modem chip and device of low-voltage powerline carrier communication.
Background technology
Low-voltage powerline carrier communication (Low Power Line Communication, Low PLC) refers to and utilizes existing existing strong and reliable low pressure 220V circuit as communications carrier, by carrier system, digital signal is carried out the technology of high-speed transfer.This technology possesses the features such as wiring networking construction volume is little, transmission line is reliable and stable, route is reasonable.
But, the signal attenuation characteristic on low-voltage power line and interference characteristic very complicated, and randomness, time variation are large.The rate of information throughput of existing low-voltage power line communication equipment is low simultaneously, efficiency of transmission is low, and traditional PLC (Power Line Communication, power line carrier, PLC) end modification demodulation module only possesses basic physical-layer carrier modulation /demodulation function, realize the procotol analytical capabilities of communication system, then terminal equipment all needs modulation /demodulation physical module to add external MCU (micro-control unit) processing protocol, therefore circuitry is complicated, cost is high.How to overcome the above problems and propose very high requirement to the design of PHY in low-voltage power line carrier communication system (physics) layer equipment, the high-performance of exploitation applicable China power line communication feature, the terminal equipment of low cost are important topics in this technical field.
Utility model content
Technical problem to be solved in the utility model is to provide a kind of modem chip and device of low-voltage powerline carrier communication, is applicable to power line carrier communication feature, and has the simple feature of structure.
In order to solve the problems of the technologies described above, the utility model provides a kind of modem chip of low-voltage powerline carrier communication, comprising:
Signalling to circuit, comprise successively be connected: scrambler module, RS coding module, convolutional encoder module, carrier modulation block, the first digital filtering module;
Signal reception direction circuit, comprise successively be connected: the second digital filtering module, demodulation module, Viterbi decoder module, RS decoder module, descrambling module; And
Microcomputer system in sheet, is connected with described RS coding module, convolutional encoder module, carrier modulation block, demodulation module, Viterbi decoder module, RS decoder module respectively.
Preferably, signalling also comprises to circuit:
Send analog front circuit module, input is connected with described first digital filtering module.
Preferably, described chip also comprises:
Micro-control unit interface module, provides the external interface of being developed as micro-control unit in device board by described interior microcomputer system.
In order to solve the problems of the technologies described above, the utility model additionally provides a kind of modulation-demodulation device of low-voltage powerline carrier communication, comprising:
Modem chip, comprising:
Signalling to circuit, comprise successively be connected: scrambler module, RS coding module, convolutional encoder module, carrier modulation block, the first digital filtering module;
Signal reception direction circuit, comprise successively be connected: the second digital filtering module, demodulation module, Viterbi decoder module, RS decoder module, descrambling module; And
Microcomputer system in sheet, is connected with described RS coding module, convolutional encoder module, carrier modulation block, demodulation module, Viterbi decoder module, RS decoder module respectively;
Also comprise: the coupling circuit be coupled with low-voltage power line, band pass filter, pre-amplifier, power amplifier, host computer;
Described band pass filter input is connected with described coupling circuit, output is connected with pre-amplifier; Described pre-amplifier output is connected with described modem chip; Described modem chip output is connected with described power amplifier; Described power amplifier output is connected with described coupling circuit; Described host computer is connected with described modem chip.
Preferably, described modem chip also comprises:
Send analog front circuit module, input is connected with described first digital filtering module.
Preferably, described modem chip also comprises:
Micro-control unit interface module, provides the external interface of being developed as micro-control unit in device board by described interior microcomputer system.
The beneficial effects of the utility model are: the utility model built-in miniature computer system (ARM) device can complete protocol analysis, the application management of PHY, DL in power line carrier system (data link) layer, and the ustomer premises access equipment for low pressure power line communication system provides low cost, the high performance solution of monolithic.The RS coding module of the utility model indoor design cascade and convolutional encoder module, can realize the low reception error rate, improve the accuracy rate of information transmission in the adverse circumstances of large interference, low signal-to-noise ratio.Possess the features such as anti-strong noise, high decay and bursty interference, the carrier frequency that can realize higher information code transmission rate He can match.Built-in MCU interface module provides SOC (system level chip) One Chip Solutions for the PHY device in power-line carrier communication system, compares significantly improve information transfer efficiency with legacy equipment.The utility model effectively reduces the error rate, improves meter reading efficiency and one-time success rate.And the utility model is with low cost, without the need to rewiring, can be widely used in low-voltage power line carrier communication system, especially be applicable to being applied in existing Low Voltage Power Line Carrier Record System.The utility model carrier frequency is adjustable, avoids the Frequency point of bursty interference and the lasting interference of a certain Frequency point, effectively solves the difficulty that the lasting interference of existing kilowatt meter reading-out system to bursty interference and a certain frequency is unable to do what one wishes.
Accompanying drawing explanation
Fig. 1 is the structural representation of the modem chip of the low-voltage powerline carrier communication that the utility model embodiment provides.
Fig. 2 is the apparatus structure schematic diagram that the utility model embodiment provides.
Fig. 3 is the schematic diagram that the utility model is applied to low pressure power line communication system.
Embodiment
The technical solution of the utility model is further illustrated by embodiment below in conjunction with accompanying drawing.
SoC is called system level chip, also has title SOC (system on a chip), and meaning it is a product, is an integrated circuit having application-specific target, wherein comprises holonomic system and has the full content of embedded software.It is again a kind of technology simultaneously, in order to realize from certainty annuity function, divides to software/hardware, and the whole process of complete design.Main thought of the present utility model arranges SoC system level chip, completes the function of low-voltage powerline carrier communication modulation /demodulation.
With reference to shown in Fig. 1, it is the structural representation of the modem chip of the low-voltage powerline carrier communication that the utility model embodiment provides.
According to the sequencing of information stream process, sending direction main functional modules comprises: scrambler module 101, RS coding module 102, convolutional encoder module 103, carrier modulation block 104, first digital filtering module 105.
RS code is also known as inner institute code, i.e. Reed-solomon codes is a kind of chnnel coding of forward error correction.
Receive the sequencing of process according to information flow, receive direction main functional modules comprises: the second digital filtering module 106, demodulation module 107, Viterbi decoder module 108, RS decoder module 109, descrambling module 110;
And
Microcomputer system 111 in sheet, is connected with described RS coding module 102, convolutional encoder module 103, carrier modulation block 104, demodulation module 107, Viterbi decoder module 108, RS decoder module 109 respectively.
In a preferred embodiment of the present utility model, signalling also comprises to circuit:
Send analog front circuit module 113, input is connected with described first digital filtering module 105.
In a preferred embodiment of the present utility model, described chip also comprises:
Micro-control unit interface module 112, provides the external interface of being developed as micro-control unit in device board by described interior microcomputer system 111.
In a preferred embodiment of the present utility model, the filtering parameter of described second digital filtering module 106 adjusts accordingly according to different carrier frequencies, low frequency and radio-frequency component is removed.
With reference to shown in Fig. 2, it is the apparatus structure schematic diagram that the utility model embodiment provides.The modulation-demodulation device of the low-voltage powerline carrier communication that the utility model provides, comprising:
Modem chip 201, comprising:
Signalling to circuit, comprise successively be connected: scrambler module, RS coding module, convolution module, carrier modulation block, the first digital filtering module;
Signal reception direction circuit, comprise successively be connected: the second digital filtering module, demodulation module, Viterbi decoder module, RS decoder module, descrambling module; And
Microcomputer system in sheet, is connected with described RS coding module, convolutional encoder module, carrier modulation block, demodulation module, Viterbi decoder module, RS decoder module respectively;
Also comprise: the coupling circuit 203 be coupled with low-voltage power line 202, band pass filter 204, pre-amplifier 205, power amplifier 206, host computer 207;
Described band pass filter 204 input is connected with described coupling circuit 203, output is connected with pre-amplifier 205; Described pre-amplifier 205 output is connected with described modem chip 201; Described modem chip 201 output is connected with described power amplifier 206; Described power amplifier 206 output is connected with described coupling circuit 203; Described host computer 207 is connected with described modem chip 201.
In a preferred embodiment of the present utility model, described modem chip 201 also comprises:
Send analog front circuit module, input is connected with described first digital filtering module.
In a preferred embodiment of the present utility model, described modem chip 201 also comprises:
Micro-control unit interface module, provides the external interface of being developed as micro-control unit in device board by described interior microcomputer system.
In a preferred embodiment of the present utility model, described second digital filtering module filtering parameter adjusts accordingly according to different carrier frequencies, low frequency and radio-frequency component is removed.
Each module is a circuit unit.
With reference to shown in Fig. 3, it is the schematic diagram that the utility model is applied to low pressure power line communication system.The utility model is applied in ustomer premises access equipment, is connected with local side apparatus by repeater.
Below specific works feature of the present utility model is illustrated.
Chip of the present utility model, when starting working, first first carries out scrambler to raw information, increases the randomness of signal energy distribution.Subsequently by RS coding and the convolutional encoding of cascade, possesses forward error correction function (FEC).
The utility model adopts BFSK (digital frequency modulation is also known as frequency shift keying) modulator approach and centre carrier frequency is adjustable.
The utility model receiving unit adopts differential coherent demodulation method to recover modulation intelligence, adopts Viterbi decoder module, through FEC (forward error correction
)decoding, recovers raw information after descrambling.
Coding of the present invention, modulation, filtering, demodulation, decoding all based on digital method design, realize based on ARM software programming in sheet.
Sending direction information frame enters scrambler module to increase signal energy randomness.Scrambler adopts pseudo-random binary sequence, and generator polynomial is: 1+X
14+ X
15, initial value is 0X9500.In order to provide a synchronizing information to descrambling module, scrambler need carry out initialization at the frame head byte place of each frame.
Information frame after scrambler enters RS coding module, and RS coding module takes from original system RS (255,239, t=8), is punctured into the random error byte of (N, N-16, t=8) coding permission verification 8 according to information frame length N.Code generator polynomial is: g (x)=(x+ α
0) (x+ α
1) (x+ α
2) ... (x+ α
15) wherein α=0X02; Field generator polynomial is: p (x)=x
8+ x
4+ x
3+ x
2+ 1.RS shortened code can increase corresponding all-zero word joint after data field, is abandoned by these null bytes again and generate RS code after RS coding.
The output of RS coding enters convolutional encoder module, and convolutional encoding adopts widely used (2,1,7) standard convolutional codes in communication system, and generator polynomial is G=[171 133], and encoding rate selects Rate1/2.
The information that convolutional encoding exports enters modulation module, the carrier wave that the inner self-generating centre frequency of the present invention is variable, carries out carrier modulation by BFSK modulator approach, then sends the output of AFE (analog front end) (AFE) circuit after filtering and accordingly.
The signal received from low-voltage power line carries out programmable digital filtering after simulating receiving circuit process accordingly.
Eliminate high frequency after digital filtering, low-frequency disturbance information obtain near centre carrier frequency, carrier signal within the scope of inromation bandwidth, adopt differential coherent demodulation method, realize point several times time delay by digital filtering method and finally obtain the baseband coding information after demodulation.
Coded message after demodulation sends into the decoding of Viterbi decoding module, the thought of Viterbi decoding utilizes trellis diagram exactly, the actual deviation of each paths of searching record, repeatedly each Path error added, compare, selection operation, final selection deviation minimal path, recovers initial data by the input value each time recalling path.Based on (2 in the design, 1,7) its corresponding Viterbi algorithm of convolution code has 64 kinds of states, and each decoding moment has 2 paths to arrive same state, therefore need record 128 path metrics, but only retain 64 little paths of deviation after alternative.Traceback depth should meet and is not less than 5* (N-1), N=7 herein.
Recover original rate information data after Viterbi decoding, frame head determines that RS decoded data block carries out RS decoding and error synchronously.
Eventually pass the decoding module decodes of same generator polynomial, recover original information frame.
The ARM participation computing that the present invention is built-in in whole coding, decoding, modulation, demodulation process, provides external MCU interface to make user the ARM in sheet can be developed use as the MCU in device board simultaneously.
Below know-why of the present utility model is described in conjunction with specific embodiments.These describe just in order to explain principle of the present utility model, and can not be interpreted as the restriction to the utility model protection range by any way.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present utility model, and these modes all will fall within protection range of the present utility model.
Claims (6)
1. a modem chip for low-voltage powerline carrier communication, is characterized in that, comprising:
Signalling to circuit, comprise successively be connected: scrambler module, RS coding module, convolutional encoder module, carrier modulation block, the first digital filtering module;
Signal reception direction circuit, comprise successively be connected: the second digital filtering module, demodulation module, Viterbi decoder module, RS decoder module, descrambling module; And
Microcomputer system in sheet, is connected with described RS coding module, convolutional encoder module, carrier modulation block, demodulation module, Viterbi decoder module, RS decoder module respectively.
2. the modem chip of low-voltage powerline carrier communication as claimed in claim 1, it is characterized in that, signalling also comprises to circuit:
Send analog front circuit module, input is connected with described first digital filtering module.
3. the modem chip of low-voltage powerline carrier communication as claimed in claim 1, is characterized in that, also comprise:
Micro-control unit interface module, provides the external interface of being developed as micro-control unit in device board by described interior microcomputer system.
4. a modulation-demodulation device for low-voltage powerline carrier communication, is characterized in that, comprising:
Modem chip, comprising:
Signalling to circuit, comprise successively be connected: scrambler module, RS coding module, convolutional encoder module, carrier modulation block, the first digital filtering module;
Signal reception direction circuit, comprise successively be connected: the second digital filtering module, demodulation module, Viterbi decoder module, RS decoder module, descrambling module; And
Microcomputer system in sheet, is connected with described RS coding module, convolutional encoder module, carrier modulation block, demodulation module, Viterbi decoder module, RS decoder module respectively;
Also comprise: the coupling circuit be coupled with low-voltage power line, band pass filter, pre-amplifier, power amplifier, host computer;
Described band pass filter input is connected with described coupling circuit, output is connected with pre-amplifier; Described pre-amplifier output is connected with described modem chip; Described modem chip output is connected with described power amplifier; Described power amplifier output is connected with described coupling circuit; Described host computer is connected with described modem chip.
5. the modulation-demodulation device of low-voltage powerline carrier communication as claimed in claim 4, it is characterized in that, described modem chip also comprises:
Send analog front circuit module, input is connected with described first digital filtering module.
6. the modulation-demodulation device of low-voltage powerline carrier communication as claimed in claim 4, it is characterized in that, described modem chip also comprises:
Micro-control unit interface module, provides the external interface of being developed as micro-control unit in device board by described interior microcomputer system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520266248.2U CN204615911U (en) | 2015-04-28 | 2015-04-28 | A kind of modem chip of low-voltage powerline carrier communication and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520266248.2U CN204615911U (en) | 2015-04-28 | 2015-04-28 | A kind of modem chip of low-voltage powerline carrier communication and device |
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| Publication Number | Publication Date |
|---|---|
| CN204615911U true CN204615911U (en) | 2015-09-02 |
Family
ID=53968432
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|---|---|---|---|
| CN201520266248.2U Expired - Fee Related CN204615911U (en) | 2015-04-28 | 2015-04-28 | A kind of modem chip of low-voltage powerline carrier communication and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530052A (en) * | 2015-12-30 | 2016-04-27 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Visible light communication system based on MPPM (Multi-Pulse Position Modulation) and RS (Reed Solomon) codes |
| CN106453175A (en) * | 2016-11-30 | 2017-02-22 | 贵州省计量测试院 | High-efficiency digital modulation and demodulation device for data transmission of measurement while drilling system |
| CN108880624A (en) * | 2018-06-11 | 2018-11-23 | 杨俊杰 | A kind of combination NFC and power carrier and wireless SOC communication chip |
-
2015
- 2015-04-28 CN CN201520266248.2U patent/CN204615911U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105530052A (en) * | 2015-12-30 | 2016-04-27 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Visible light communication system based on MPPM (Multi-Pulse Position Modulation) and RS (Reed Solomon) codes |
| CN106453175A (en) * | 2016-11-30 | 2017-02-22 | 贵州省计量测试院 | High-efficiency digital modulation and demodulation device for data transmission of measurement while drilling system |
| CN108880624A (en) * | 2018-06-11 | 2018-11-23 | 杨俊杰 | A kind of combination NFC and power carrier and wireless SOC communication chip |
| CN108880624B (en) * | 2018-06-11 | 2021-02-26 | 杨俊杰 | SOC communication chip combining NFC, power line carrier and wireless communication module |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150902 Termination date: 20170428 |