CN104468452A - OFDM-based data transmission device - Google Patents
OFDM-based data transmission device Download PDFInfo
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- CN104468452A CN104468452A CN201410759270.0A CN201410759270A CN104468452A CN 104468452 A CN104468452 A CN 104468452A CN 201410759270 A CN201410759270 A CN 201410759270A CN 104468452 A CN104468452 A CN 104468452A
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- ofdm
- data transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Communication Control (AREA)
- Noise Elimination (AREA)
Abstract
The invention discloses an OFDM-based data transmission device. A high-speed DSP and a corresponding software program are adopted for detecting and judging the operation situation of two mainframes and two channels, corresponding non-contact soft handover is carried out when a certain mainframe or channel breaks down, normal communication is not affected when any mainframe or channel breaks down, and meanwhile as a hardware switching circuit is omitted, safety and reliability of data transmission are greatly improved. Aiming at solving the problems that a power line carrier channel is large in noise and severe in interference, improving the impulse interference and narrow-band interference resistance capacity of data signal transmission to the maximum extent and effectively improving the utilization rate of a frequency band at the same time, the OFDM and the method realized by the DSP software are adopted, and the goal that signal transmission rate in bandwidth of 4 kHz on a power line reaches 9600 b/s is achieved.
Description
Technical field
The present invention relates to field of data transmission, be specifically related to a kind of data transmission device based on OFDM.
Background technology
Power line carrier communication is the distinctive communication mode of electric power system, and it is transmission medium with power circuit, has the advantageous advantages such as channel reliability is high, survivability strong, small investment, instant effect.In China, through the development and application of decades, the scale that tool is suitable and level, one of Primary communication means becoming power telecommunication network.For the economic dispatch of electrical production and management, electrical network and safe and stable operation have played important function.
The available band resource of power line carrier communication is 40kHz ~ 500kHz (easily extensible is to 1000kHz); and existing high voltage power transmission line carrier communication (PLC) is all based on the narrow band transmission in nominal baseband (4kHz ~ 8kHz), be only suitable for the transmission of the low-speed data services such as speech, telemechanical and protection.Therefore existing high voltage power transmission line carrier communication fails to make full use of frequency resource, and there is the availability of frequency spectrum low, transmission rate is low, the shortcoming that transmission communication system of power grids business is limited.
The aspect such as mode, scale of development to communication of power system of modern communication technology creates tremendous influence, proposes stern challenge to power line carrier communication.Should see, power line carrier communication can not meet modern power systems operation controls, protection information transmits real-time, rapidity and reliability and the requirement transmitted other bulk informations really far away.For meeting the needs of modern power systems development, adapt to the main trend of global Communication Development, make China's power communication to two-forty, broadband, Large Copacity, digitlization future development, research high-voltage power line high-speed wideband carrier communication key technology, break through the limitation of conventional high-tension power line carrier arrowband low speed transmissions, utilize band resource as much as possible, promote the Technical Economy of carrier communication, for energy communication service provides applicable high speed data transfer, necessary.
Summary of the invention
For solving the problem, the invention provides a kind of data transmission device based on OFDM.
For achieving the above object, the technical scheme that the present invention takes is:
Based on a data transmission device of OFDM, comprise
Digital signal processing module, adopts ADSP2187 (40MHz) chip;
Multichannel encoding and decoding (CODEC) module, adopts 16 Bits Serial dsp interface stereophonic signal codec AD1849;
Interface modular converter, adopts RS232 interface convertor;
Single-chip microcomputer (MCU) control module, adopts the MCU of 8 passages, includes 12 analog to digital converter ADuC831;
Any known network management procedure module, utilizes the man-machine dialog interface that C++Builder practical function is perfect, is arranged by the various operational factors of PC to OFDM9600 modulator-demodulator.
Preferably, described ADSP2187 chip adopts IDMA guidance mode, and MCU is from IDMA mouth to sheet internal writer and data, and before address 0 writes, program can not be run.
Preferably, described AD1849 adopts DCB agreement when writing control word information.
The present invention has following beneficial effect:
Adopt high-speed dsp and corresponding software programming, two main frame, twin-channel ruuning situation are carried out detecting and judged, corresponding contactless soft handover is carried out when certain main frame or passage break down, any one main frame or passage do not affect proper communication when breaking down, simultaneously owing to eliminating hardware exchange circuit, substantially increase the safety and reliability of transfer of data;
Utilize the man-machine dialog interface that C++Builder practical function is perfect, arranged by the various operational factors of PC to OFDM9600 digital intelligent switch modulation demodulator, eliminate that to adopt toggle switch, wire jumper and potentiometer to arrange the setting steps brought numerous and diverse, unstable and occur wrong setting, substantially increase equipment reliability of operation and fail safe;
Noise for power-line carrier channel is large, the feature of serious interference, in order to the ability that the anti-impulse disturbances and arrowband that improve data-signal transmission are to greatest extent disturbed, effectively improve the utilance of frequency band simultaneously, have employed a kind of orthogonal multicarrier modulation and demodulation (OFDM) and utilize the method for digital signal processor (DSP) software simulating, in the bandwidth achieving 4kHz on power line, signal transmission rate reaches the target of 9600b/s.
Accompanying drawing explanation
Fig. 1 is DSP schematic diagram in ADSP2187 chip in the embodiment of the present invention.
Fig. 2 is multichannel coding/decoding module schematic diagram in the embodiment of the present invention.
Fig. 3 is AD1849 initialize routine flow chart in the embodiment of the present invention.
Fig. 4 is the schematic diagram of single-chip microcomputer (MCU) control module in the embodiment of the present invention.
Fig. 5 is single-chip microcomputer (MCU) control module initialize routine flow chart in the embodiment of the present invention.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Based on a data transmission device of OFDM, comprise
Digital signal processing module, adopts ADSP2187 (40MHz) chip; This chip generally has some following main features:
40MHz dominant frequency, 80MIPS (execution per second 1,000,000 instructions, 25ns instruction cycle); 256KB memory in sheet, can be configured to 48K × 24bit program area (PM) and 56K × 16bit data field (DM), and PM can simultaneously store data; Independently ALU, multiplication/accumulator, barrel shifter; Two independently address generators; Two double buffering serial ports; 1 16bitDMA; 6 external interrupt; 13 programmable flag pins (PF0-PF7, flag_in, flag_out, FL0-2); In the instruction cycle, 5 operations can be completed at most: produce next instruction address, take off an instruction, perform 1-2 secondary data and move, upgrade 1-2 address pointer; 2 independently synchronous serial interface SPORT0 and SPORT1, provide a kind of serial i/O interface easily flexibly for being connected with external equipment.
Multichannel encoding and decoding (CODEC) module, adopts 16 Bits Serial dsp interface stereophonic signal codec AD1849;
Interface modular converter, adopts RS232 interface convertor;
Single-chip microcomputer (MCU) control module, adopts the MCU of 8 passages, includes 12 analog to digital converter ADuC831; ADuC831 is the MCU of 8 passages, include 12 analog to digital converters, microcontroller core is 8051, data RAM and the kernel with 8051 compatibilities in the sheet providing 62kB non-volatile flash in sheet/electricity to wipe 4KB non-volatile flash/electric obliterated data memory, 2304B in program storage, sheet.Serial download and debugging mode (passing through UART) are provided in sheet, and provide simulation model by EA pin.ADuC812 supports the software and hardware instrument of QuickStartTM and QuickStart Plus upgrade-system and low cost.MCU is communicated with PC by RS232 level transferring chip, completes the function such as optimum configurations, reading dsp operation data of the download of program, OFDM9600.As shown in Figure 4, MCU's its schematic diagram is connected with I2C chip by I2C bus, and the working procedure of DSP is downloaded to I2C chip from PC.When MCU electrification reset and after carrying out initialization, DSP is resetted, then the DSP program of preserving in I2C reads by MCU, by IDMA bus mouth (IAD0 ~ IAD15 of P0.0 ~ P0.7 and P2.0 ~ P2.7 and DSP is connected) to load module and data in DSP sheet, after FA final address 0 writes instruction, program brings into operation.During dsp operation, MCU can read the data storage of DSP by IDMA bus mouth, thus judges that whether the algorithm of the ruuning situation of DSP and audit program is correct.Flow chart as shown in Figure 5.
Any known network management procedure module, utilizes the man-machine dialog interface that C++Builder practical function is perfect, is arranged by the various operational factors of PC to OFDM9600 modulator-demodulator.
Described ADSP2187 chip adopts IDMA guidance mode, and MCU is from IDMA mouth to sheet internal writer and data, and before address 0 writes, program can not be run.FL1 and FL2 output pin is used for resetting and Schema control to AD1849, and PF0 ~ PF7, FL0, FLAG_IN, FLAG_OUT use as data, digital channel, carrier monitoring, switching, and these pins are connected with ADM202, complete RS232 level conversion.DSP schematic diagram as shown in Figure 1.DSP is connected with AD1849 by serial ports 0, completes codec functions, and realizes the adjustment of output gain.Serial ports 0 interruption subroutine: the data of the data storage x_out after multiple modulation are sent to codec and carry out D/A conversion; Data after being changed by codec A/D are stored into data storage x_in, to carry out demodulation to the received signal, the speed that serial ports 0 interrupts is the sampling rate of AD1849, and AD1849 often sampling should be carried out data, DSP main program carries out single treatment.
Described AD1849 adopts DCB agreement when writing control word information.
First the D/C pin of AD1849 is set low level by DSP, control AD1849 enters control model, following DSP is by the control information frame of the serial data in pin write DCB=0 of chip, AD1849 chip exports by serial data out pin the control information frame that AD1849 chip receives by when next frame, when DSP detects the effective control information writing DCB=1 in loopback message after DCB=0 to AD1849, feedback DCB=1 control information after AD1849 has required internal register to configure according to DSP, whether DSP just can correctly write by comformed information by detecting DCB=1, if information correctly writes so peripheral control unit, can to put pin be that high level control AD1849 enters normal audio encoding and decoding.As shown in Figure 2, AD1849 initialize routine flow chart as shown in Figure 3 for multichannel coding/decoding module schematic diagram.
This concrete principle implemented is:
The data-signal (" 1 " or " 0 ") exported by data terminal carries out delivering to DSP after level conversion through RS232 interface convertor, DSP carries out serial to parallel conversion, frame synchronization sequence inserts and coding, signal map, obtain time domain sample sequences y (n) of multi-carrier modulation (OFDM) modulated signal after IDFT, get the real part of y (n), then export multicarrier modulated signal by the D/A of multi-channel audio codec (CODEC).The multicarrier modulated signal received converts digital signal to through the A/D of multi-channel audio codec (CODEC) and delivers to DSP, DSP carries out DFT, signal inverse mapping, clock synchronous, delete frame synchronizing sequence carrying out are decoded, parallel serial conversion recovers initial data, carries out delivering to data terminal after level conversion through RS232 interface convertor.
This concrete enforcement adopts high-speed dsp and corresponding software programming, two main frame, twin-channel ruuning situation are carried out detecting and judged, corresponding contactless soft handover is carried out when certain main frame or passage break down, any one main frame or passage do not affect proper communication when breaking down, simultaneously owing to eliminating hardware exchange circuit, substantially increase the safety and reliability of transfer of data; Utilize the man-machine dialog interface that C++Builder practical function is perfect, arranged by the various operational factors of PC to OFDM9600 digital intelligent switch modulation demodulator, eliminate that to adopt toggle switch, wire jumper and potentiometer to arrange the setting steps brought numerous and diverse, unstable and occur wrong setting, substantially increase equipment reliability of operation and fail safe; This project is large for the noise of power-line carrier channel, the feature of serious interference, in order to the ability that the anti-impulse disturbances and arrowband that improve data-signal transmission are to greatest extent disturbed, effectively improve the utilance of frequency band simultaneously, have employed a kind of orthogonal multicarrier modulation and demodulation (OFDM) and utilize the method for digital signal processor (DSP) software simulating, in the bandwidth achieving 4kHz on power line, signal transmission rate reaches the target of 9600b/s.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. based on a data transmission device of OFDM, it is characterized in that, comprise
Digital signal processing module, adopts ADSP2187 (40MHz) chip;
Multichannel encoding and decoding (CODEC) module, adopts 16 Bits Serial dsp interface stereophonic signal codec AD1849;
Interface modular converter, adopts RS232 interface convertor;
Single-chip microcomputer (MCU) control module, adopts the MCU of 8 passages, includes 12 analog to digital converter ADuC831;
Any known network management procedure module, utilizes the man-machine dialog interface that C++Builder practical function is perfect, is arranged by the various operational factors of PC to OFDM9600 modulator-demodulator.
2. a kind of data transmission device based on OFDM according to claim 1, is characterized in that, described ADSP2187 chip adopts IDMA guidance mode, and MCU is from IDMA mouth to sheet internal writer and data, and before address 0 writes, program can not be run.
3. a kind of data transmission device based on OFDM according to claim 1, is characterized in that, described AD1849 adopts DCB agreement when writing control word information.
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| CN201410759270.0A CN104468452B (en) | 2014-12-06 | 2014-12-06 | A kind of data transmission device based on OFDM |
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| CN201410759270.0A CN104468452B (en) | 2014-12-06 | 2014-12-06 | A kind of data transmission device based on OFDM |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112153447A (en) * | 2020-09-27 | 2020-12-29 | 海信视像科技股份有限公司 | Display device and sound and picture synchronous control method |
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| CN112153447A (en) * | 2020-09-27 | 2020-12-29 | 海信视像科技股份有限公司 | Display device and sound and picture synchronous control method |
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