CN211239852U - Ultraviolet light communication receiving device based on frequency shift keying - Google Patents
Ultraviolet light communication receiving device based on frequency shift keying Download PDFInfo
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- CN211239852U CN211239852U CN201922318163.5U CN201922318163U CN211239852U CN 211239852 U CN211239852 U CN 211239852U CN 201922318163 U CN201922318163 U CN 201922318163U CN 211239852 U CN211239852 U CN 211239852U
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Abstract
The utility model discloses an ultraviolet light communication receiving arrangement based on frequency shift keying, including optics receiving antenna, photo detector and preamplifier, limiting amplifier, zero crossing point detection module, low pass filter, multiplier, low pass filter, AD sampling module and signal processing module; the optical receiving antenna is connected with the optical detector and the preamplifier, and the output ends of the optical detector and the preamplifier are respectively connected with the limiting amplifier and the low-pass filter; the limiting amplifier is sequentially connected with the zero crossing point detection module and the signal processing module; the low-pass filter is connected with the multiplier, the low-pass filter, the AD sampling module and the signal processing module in sequence. The utility model discloses ultraviolet light communication receiving arrangement based on frequency shift keying utilizes frequency and envelope information to detect received signal simultaneously, can resume the signal better, reduces the error rate, improves the system reliability.
Description
Technical Field
The utility model belongs to the technical field of ultraviolet light communication, especially an ultraviolet light communication receiving arrangement based on frequency shift keying.
Background
The ultraviolet communication is a communication mode for realizing information transmission by utilizing the scattering effect of ultraviolet light in the atmosphere, can bypass barriers to realize non-direct-view communication, and has the characteristics of hidden position, strong anti-interference capability, all-weather working, non-direct-view working modes of similar radio waves and the like. The local security of ultraviolet light communication can meet the requirement of communication in a certain area under the condition of radio silence. Moreover, the ultraviolet light communication system has the advantages of small size, light weight, modularization and no need of optical alignment before opening, and can ensure wartime communication to a certain extent.
One of the problems faced by ultraviolet light communication is its large link loss, resulting in a limited communication range, limiting its applications. In order to extend the communication distance, researchers often select a low-pressure mercury lamp with large emergent light power. The low-pressure mercury lamp is characterized by that the lamp body is filled with mercury vapour with lower pressure intensity, the pressure intensity is generally between several Pa and several tens Pa, its power is about several watts to several hundreds watt, its photoelectric conversion efficiency is higher, and can be up to about 70%, and the radiated spectral line is narrower, mainly is concentrated in 254nm and 180nm, and the ultraviolet light positioned in 180nm can be isolated and filtered by means of general glass. Researchers have generally chosen Frequency Shift Keying (FSK) modulation of low pressure mercury lamps based on their operating characteristics.
In the actual modulation process, when modulation signals with different frequencies are applied to the low-pressure mercury lamp, the external impedance of the circuit is different due to the difference of carrier frequencies, so that the driving current and the light intensity are changed. Therefore, while the FSK modulation circuit realizes frequency shift keying modulation, the output signal thereof also varies in magnitude due to the difference in circuit impedance, resulting in actual amplitude modulation, thereby causing the magnitude of signals of different frequencies to also differ.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an ultraviolet ray communication receiving arrangement based on frequency shift keying.
Realize the utility model discloses the technical solution of purpose does: an ultraviolet light communication receiving device based on frequency shift keying comprises an optical receiving antenna, a light detector, a preamplifier, a limiting amplifier, a zero crossing point detection module, a first low-pass filter, a multiplier, a second low-pass filter, an AD sampling module and a signal processing module;
the optical receiving antenna is connected with the optical detector and the preamplifier, and the output ends of the optical detector and the preamplifier are respectively connected with the limiting amplifier and the first low-pass filter; the limiting amplifier is sequentially connected with the zero crossing point detection module and the signal processing module; the first low-pass filter is connected with the multiplier, the second low-pass filter, the AD sampling module and the signal processing module in sequence.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model provides an ultraviolet light communication receiving arrangement based on frequency shift keying not only detects received signal through the frequency, still utilizes the amplitude information of signal simultaneously, can resume the signal better, reduces the error rate, improves the system reliability.
Drawings
Fig. 1 is a schematic diagram of a frequency shift keyed ultraviolet light signal received by a photodetector.
Fig. 2 is a schematic diagram of a signal detection device suitable for frequency shift keying ultraviolet communication.
Fig. 3 is a schematic diagram of the signal after passing through the first low-pass filter.
Fig. 4 is a schematic diagram of the signal after passing through a second low-pass filter.
Detailed Description
The link loss of the ultraviolet light communication is large, so that the communication range is limited. In order to extend the communication distance, a low-pressure mercury lamp with large emergent light power is often selected as a light source, and the low-pressure mercury lamp is modulated by Frequency Shift Keying (FSK). In the actual modulation process, when modulation signals with different frequencies are applied to the low-pressure mercury lamp, the external impedance of the circuit is different due to the difference of carrier frequencies, so that the driving current and the light intensity are changed. Therefore, while the FSK modulation circuit realizes frequency shift keying modulation of the low-pressure mercury lamp, the output signal thereof also varies in magnitude, causing a substantial amplitude modulation, thereby causing the amplitudes of signals of different frequencies to be different. The utility model provides an ultraviolet light communication receiving arrangement based on frequency shift keying can utilize frequency and envelope information to detect received signal simultaneously, can resume the signal better, reduces the error rate, improves the system reliability.
As shown in fig. 2, an ultraviolet light communication receiving device based on frequency shift keying includes an optical receiving antenna 1, a photodetector and preamplifier 2, a limiting amplifier 3, a zero-crossing point detecting module 4, a first low-pass filter 6, a multiplier 7, a second low-pass filter 8, an AD sampling module 9, and a signal processing module 10;
the optical receiving antenna 1 is connected with a photodetector and a preamplifier 2, and the output ends of the photodetector and the preamplifier 2 are respectively connected with a limiting amplifier 3 and a first low-pass filter 6; the limiting amplifier 3 is connected with the zero crossing point detection module 4 and the signal processing module 10 in sequence; the first low-pass filter 6 is connected with the multiplier 7, the second low-pass filter 8, the AD sampling module 9 and the signal processing module 10 in sequence.
Further, the ultraviolet light communication receiving device further comprises a bit synchronization extraction module 5, wherein an input end of the bit synchronization extraction module 5 is connected with the second low-pass filter 8, and an output end of the bit synchronization extraction module 5 is respectively connected with the zero crossing point detection module 4 and the signal processing module 10.
The ultraviolet light signal is collected by an optical receiving antenna 1, converted into an electric signal by a photodetector and a preamplifier 2, and amplified to obtain carrier frequencies w1And w2＝2w1The output of the binary FSK signal is divided into two paths.
One signal passes through a first low-pass filter 6 to convert w2The frequency filtered output signal is shown in FIG. 3, and then multiplied by a multiplier 7 and Sin (w)1t) multiplication in which w1Is a carrier frequency of the FSK modulation, the higher frequency components are filtered out by the second low pass filter 8, leaving only the baseband data signal, as shown in fig. 4. The bit synchronization extraction module 5 performs bit synchronization extraction. The AD sampling module 9 converts the analog signal shown in fig. 4 into a digital signal, and sends the digital signal to the signal processing module 10.
The other path of signal output by the photodetector and the preamplifier 2 is sent to the limiting amplifier 3 for amplifying again, and then the zero crossing point detection module 4 detects the zero crossing point times of the signal. The synchronization clock of which is provided by the bit sync extraction module 5. Since the zero crossing times represent different modulation frequencies, this procedure corresponds to the demodulation of an FSK signal. The number of zero crossings detected in a symbol period is a random quantity due to the influence of noise, and this data is sent to the signal processing block 10.
The signal processing module 10 receives two signals, one of which is a signal obtained by frequency detection, and the other of which is a signal obtained by envelope demodulation. In the signal processing module 10, a signal with the best signal-to-noise ratio is selected from the two paths of input data through a merging algorithm as a decision basis of output data, so that the reliability of signal detection and the system performance are improved. The merging algorithm is an algorithm existing in the field, and the protection content of the utility model is the composition of the receiving device and the connection relation thereof.
The abscissa of fig. 1, fig. 3 and fig. 4 of the present invention is time, unit us, and the ordinate is normalized amplitude.
The present invention will be described in detail with reference to the following examples.
Examples
An ultraviolet light communication receiving device based on frequency shift keying comprises an optical receiving antenna 1, a light detector and preamplifier 2, a limiting amplifier 3, a zero crossing point detection module 4, a bit synchronization extraction module 5, a first low-pass filter 6, a multiplier 7, a second low-pass filter 8, an AD sampling module 9 and a signal processing module 10.
Fig. 1 shows a frequency shift keyed ultraviolet light signal received by a photodetector. Setting two carrier frequencies of binary FSK as w1And w2＝2w1. After being amplified by the preamplifier, the output is divided into two paths.
One path of signal firstly passes through a first low-pass filter 6 to convert w2The frequency filtered output signal is shown in FIG. 3, and then multiplied by a multiplier 7 and Sin (w)1t) multiplication in which w1Is a carrier frequency of the FSK modulation, the higher frequency components are filtered out by the second low pass filter 8, leaving only the baseband data signal, as shown in fig. 4. The bit synchronization extraction module 5 performs bit synchronization extraction. The AD sampling module 9 converts the analog signal shown in fig. 4 into a digital signal, and sends the digital signal to the signal processing module 10.
The other path of signal is sent to the limiting amplifier 3 for amplifying again, and then the zero crossing point detection module 4 detects the zero crossing point times of the signal. The synchronization clock of which is provided by the bit sync extraction module 5. Since the zero crossing times represent different modulation frequencies, this procedure corresponds to the demodulation of an FSK signal. The number of zero crossings detected in a symbol period is a random quantity due to the influence of noise, and this data is sent to the signal processing block 10.
The signal processing module 10 receives two signals, one of which is a signal obtained by frequency detection, and the other of which is a signal obtained by envelope demodulation. The signal processing module 10 selects the signal with the best signal-to-noise ratio from the two paths of input data as the decision basis of the output data.
Consider that received optical signal not only contains data information on the frequency, it has also contained data information on signal amplitude, consequently, the utility model provides an ultraviolet light communication receiving arrangement based on frequency shift keying signal detection device in, not only through frequency detection received signal, still utilize the amplitude information of signal simultaneously, can resume the signal better, reduce the error rate, improve system reliability.
Claims (2)
1. An ultraviolet light communication receiving device based on frequency shift keying is characterized by comprising an optical receiving antenna (1), a light detector, a preamplifier (2), a limiting amplifier (3), a zero crossing point detection module (4), a first low-pass filter (6), a multiplier (7), a second low-pass filter (8), an AD sampling module (9) and a signal processing module (10);
the optical receiving antenna (1) is connected with the optical detector and the preamplifier (2), and the output ends of the optical detector and the preamplifier (2) are respectively connected with the limiting amplifier (3) and the first low-pass filter (6); the limiting amplifier (3) is sequentially connected with the zero crossing point detection module (4) and the signal processing module (10); the first low-pass filter (6) is sequentially connected with the multiplier (7), the second low-pass filter (8), the AD sampling module (9) and the signal processing module (10).
2. The uv light communication receiving device based on frequency shift keying according to claim 1, wherein the uv light communication receiving device further comprises a bit synchronization extraction module (5), an input end of the bit synchronization extraction module (5) is connected to the second low pass filter (8), and an output end of the bit synchronization extraction module is respectively connected to the zero crossing point detection module (4) and the signal processing module (10).
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| CN201922318163.5U CN211239852U (en) | 2019-12-22 | 2019-12-22 | Ultraviolet light communication receiving device based on frequency shift keying |
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| CN201922318163.5U CN211239852U (en) | 2019-12-22 | 2019-12-22 | Ultraviolet light communication receiving device based on frequency shift keying |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147138A (en) * | 2019-12-22 | 2020-05-12 | 中国人民解放军陆军工程大学 | Signal detection method and device suitable for frequency shift keying ultraviolet communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111147138A (en) * | 2019-12-22 | 2020-05-12 | 中国人民解放军陆军工程大学 | Signal detection method and device suitable for frequency shift keying ultraviolet communication |
| CN111147138B (en) * | 2019-12-22 | 2024-07-09 | 中国人民解放军陆军工程大学 | Signal detection method and device suitable for frequency shift keying ultraviolet communication |
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Granted publication date: 20200811 Termination date: 20211222 |