CN104410453A - Optical fiber communication method and optical fiber communication device based on LED (light emitting diode) pulses - Google Patents
Optical fiber communication method and optical fiber communication device based on LED (light emitting diode) pulses Download PDFInfo
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- CN104410453A CN104410453A CN201410696009.0A CN201410696009A CN104410453A CN 104410453 A CN104410453 A CN 104410453A CN 201410696009 A CN201410696009 A CN 201410696009A CN 104410453 A CN104410453 A CN 104410453A
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Abstract
The invention relates to an optical fiber communication method and an optical fiber communication device based on LED (light emitting diode) pulses. The device comprises a modulation transmitting unit and a demodulation receiving unit, wherein the modulation transmitting unit comprises a serial inputting end unit, a nine-bit coding unit, a multi-channel secondary carrier wave code mapping unit, a carrier wave combining unit and a modulation transmitting unit body which are sequentially connected to one another; and the demodulation receiving unit comprises a receiving unit, a band-pass filter, a multi-channel secondary carrier wave code mapping unit, a nine-bit decoding unit and a serial outputting unit which are sequentially connected to one another. By the optical fiber communication method and the optical fiber communication device based on the LED pulses, high-speed, low-power-consumption and safe isolated communication transmission can be carried out between high-voltage electric primary equipment and low-voltage electric secondary equipment of the existing high-voltage monitoring equipment.
Description
Technical field:
The present invention relates to electrical network zinc oxide arrester monitoring field, be specifically related to a kind of based on LED pulse low-power consumption fiber optic communications devices.
Background technology:
Current existing lightning arrester monitoring transmitting device many employings RS485 wire communication mechanism or wireless mechanism, consider that the RS485 communications cable is in high pressure scene, there is certain induced electricity and draw thunder danger, because transformer station belongs to high pressure place, electric discharge phenomena and corona phenomenon are very frequent, the frequency spectrum of electrical network is caused to be disturbed wider range, the reliable and stable sex work of transformer station's wireless mode is extremely disputed on always, employing conventional glass optical fibers communicates, because substation project is complicated, optical fiber use length cannot be unified and standard, need professional and professional tool just can complete mating operation, be unfavorable for present engineering construction and installation requirement, simultaneously traditional fiber line and Receiver cost higher, even traditional fiber cost will exceed the cost of monitoring device own, in order to resolution system safety and reliable communications sex chromosome mosaicism, a kind of optical fibre communication method based on common LED pulse of special invention and device.
Summary of the invention
The object of the invention is to solve the two-forty of high-voltage electrical apparatus once and between low-voltage electrical secondary of existing high pressure monitoring equipment, low-power consumption, Secure isolation communications problem, concrete technical scheme is as follows:
A kind of fiber optic communications devices based on LED pulse, comprise the modulate emission unit be connected and conciliate transfer receipts processing unit, described modulate emission unit comprises the serial input end unit connected successively, nine coding units, multichannel subcarrier code map unit, carrier combination unit, modulate emission unit; Demodulation receiving element comprise connect successively receiving element, band pass filter, multichannel subcarrier code map unit, nine decoding units, Serial output unit.
Preferably, described serial input unit is used for changing data to be sent into eight bit parallel data, through nine coding units, obtain nine bit data after band inspection, carry out mapping corresponding subcarrier code according to 256 equal portions according to eight bit parallel data sizes in multichannel subcarrier code map unit, after obtaining frequency deviation value, launch carrier signal according to the adjustment of this value, complete the transmission of a byte data.
Preferably, described receiving element is used for accepting carrier signal and imports band pass filter into, described band pass filter is for extracting effective bandwidth signal, FFT conversion is carried out through AD analog-to-digital conversion, obtain current frequency offset value, obtain data according to multichannel subcarrier code map unit mapping relations, then send into nine decoding units, separate code check and correctly send into Serial output element circuit afterwards.
The invention still further relates to a kind of optical fibre communication method based on LED pulse, the step comprising modulate emission conciliates the step that process is received in transfer:
The step of described modulate emission comprises: data flow to be sent changes eight bit parallel data into by serial input end unit, through nine coding units, obtain nine bit data after tape verifying, carry out mapping corresponding subcarrier code according to 256 equal portions according to eight bit parallel data sizes, carrier code is the frequency deviation of modulated carrier, after obtaining frequency deviation value, launch carrier signal according to the adjustment of this value, complete the transmission of a byte data;
The step that described demodulation receives process comprises: after receiving element receives carrier signal, effective bandwidth signal is extracted by band pass filter, FFT conversion is carried out through AD analog-to-digital conversion, obtain current frequency offset value, data are obtained according to multichannel subcarrier code map unit mapping relations, then send into nine decoding units, separate code check and correctly send into Serial output element circuit afterwards.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention.
Embodiment
Below, the invention will be further described in conjunction with the accompanying drawings and embodiments:
Embodiment one
A kind of fiber optic communications devices based on LED pulse, comprise the modulate emission unit be connected and conciliate transfer receipts processing unit, described modulate emission unit comprises the serial input end unit connected successively, nine coding units, multichannel subcarrier code map unit, carrier combination unit, modulate emission unit; Demodulation receiving element comprise connect successively receiving element, band pass filter, multichannel subcarrier code map unit, nine decoding units, Serial output unit.
Described serial input unit is used for changing data to be sent into eight bit parallel data, through nine coding units, obtain nine bit data after band inspection, carry out mapping corresponding subcarrier code according to 256 equal portions according to eight bit parallel data sizes in multichannel subcarrier code map unit, after obtaining frequency deviation value, launch carrier signal according to the adjustment of this value, complete the transmission of a byte data.
Described receiving element is used for accepting carrier signal and imports band pass filter into, described band pass filter is for extracting effective bandwidth signal, FFT conversion is carried out through AD analog-to-digital conversion, obtain current frequency offset value, data are obtained according to multichannel subcarrier code map unit mapping relations, then send into nine decoding units, separate code check and correctly send into Serial output element circuit afterwards.
Key point of the present invention is:
1, the R-T unit of low-power consumption LED pulse signal
2, take plastic fiber as communication transmission media
3, with the 1bit position that carrier system realizes.
Data are that unit compresses with byte by the present invention, adopt 255 kinds of carrier wave points to represent a byte, are reduced to original 1/8 the transmission time, and adopting the carrier wave point of 1MHz to transmit, is 800 times of the remote normal reliable transmission rate of common serial ports.With this, realize low power consumption transmission.
Claims (4)
1. the fiber optic communications devices based on LED pulse, it is characterized in that: comprise the modulate emission unit be connected and conciliate transfer receipts processing unit, described modulate emission unit comprises the serial input end unit connected successively, nine coding units, multichannel subcarrier code map unit, carrier combination unit, modulate emission unit; Demodulation receiving element comprise connect successively receiving element, band pass filter, multichannel subcarrier code map unit, nine decoding units, Serial output unit.
2. a kind of fiber optic communications devices based on LED pulse according to claim 1, it is characterized in that: described serial input unit is used for changing data to be sent into eight bit parallel data, through nine coding units, obtain nine bit data after band inspection, carry out mapping corresponding subcarrier code according to 256 equal portions according to eight bit parallel data sizes in multichannel subcarrier code map unit, after obtaining frequency deviation value, launch carrier signal according to the adjustment of this value, complete the transmission of a byte data.
3. a kind of fiber optic communications devices based on LED pulse according to claim 1, it is characterized in that: described receiving element is used for accepting carrier signal and imports band pass filter into, described band pass filter is for extracting effective bandwidth signal, FFT conversion is carried out through AD analog-to-digital conversion, obtain current frequency offset value, obtain data according to multichannel subcarrier code map unit mapping relations, then send into nine decoding units, separate code check and correctly send into Serial output element circuit afterwards.
4. based on an optical fibre communication method for LED pulse, it is characterized in that: the step comprising modulate emission conciliates the step that process is received in transfer:
The step of described modulate emission comprises: data flow to be sent changes eight bit parallel data into by serial input end unit, through nine coding units, obtain nine bit data after tape verifying, carry out mapping corresponding subcarrier code according to 256 equal portions according to eight bit parallel data sizes, carrier code is the frequency deviation of modulated carrier, after obtaining frequency deviation value, launch carrier signal according to the adjustment of this value, complete the transmission of a byte data;
The step that described demodulation receives process comprises: after receiving element receives carrier signal, effective bandwidth signal is extracted by band pass filter, FFT conversion is carried out through AD analog-to-digital conversion, obtain current frequency offset value, data are obtained according to multichannel subcarrier code map unit mapping relations, then send into nine decoding units, separate code check and correctly send into Serial output element circuit afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201410696009.0A CN104410453A (en) | 2013-11-27 | 2014-11-26 | Optical fiber communication method and optical fiber communication device based on LED (light emitting diode) pulses |
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| CN2013106190325 | 2013-11-27 | ||
| CN201310619032 | 2013-11-27 | ||
| CN201410696009.0A CN104410453A (en) | 2013-11-27 | 2014-11-26 | Optical fiber communication method and optical fiber communication device based on LED (light emitting diode) pulses |
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| CN104410453A true CN104410453A (en) | 2015-03-11 |
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Cited By (1)
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|---|---|---|---|---|
| CN105960045A (en) * | 2016-04-28 | 2016-09-21 | 华南师范大学 | Realization method and device of communication illumination sharing system based on LED high illumination efficiency |
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