CN221127527U - Outdoor illumination synchronous signal system based on NFDM PLC technology - Google Patents
Outdoor illumination synchronous signal system based on NFDM PLC technology Download PDFInfo
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Abstract
The utility model belongs to the technical field of outdoor lighting systems, and particularly relates to an outdoor lighting synchronous signal system based on an NFDM PLC technology, which solves the problem that the system of the NFDM is difficult to combine into a lighting synchronous system and the reliability of communication signals is poor.
Description
Technical Field
The utility model relates to the technical field of outdoor illumination systems, in particular to an outdoor illumination synchronous signal system based on an NFDM PLC technology.
Background
The outdoor lighting has been developed into a larger scale at present, so that urban and rural areas can be beautified well, in a large-scale outdoor lighting system, a plurality of lighting systems or lighting units are often combined together to reflect the whole visual effect, a plurality of lighting systems or lighting units are simultaneously lighted, a synchronous signal in time is needed, and the lighting time among all the parts is unified, so that the lighting effect of all the parts can be combined into the whole desired words, patterns and videos.
Currently, there are several methods to act as a synchronization function: each subsystem synchronizes the total system according to the real-time received by the GPS; each subsystem transmits synchronization information through a public wireless mobile network, receives the synchronization information, and synchronizes the total system on the basis; and a wireless communication base station is also arranged, and synchronous information is transmitted to each subsystem through the base station.
The above is a system synchronization method commonly used in a large outdoor lighting system, and basically, the methods all adopt a wireless communication scheme, but the wireless communication is affected, for example, the signal receiving effect of the GPS in a room is poor, the mobile wireless signal has coverage shadows, and the signal transmission reliability is poor.
Disclosure of utility model
The utility model aims to provide an outdoor illumination synchronous signal system based on an NFDM PLC technology, which solves the problem that the system of the NFDM is difficult to be combined into the illumination synchronous system, and the reliability of communication signals is poor.
In order to achieve the above purpose, the present utility model provides the following technical solutions: an outdoor illumination synchronous signal system based on an NFDM PLC technology comprises a large illumination system, wherein the large illumination system is electrically connected with a plurality of synchronous receiving systems, the synchronous receiving systems are electrically connected with a synchronous sending center system together, the synchronous sending center system sends synchronous signals to each synchronous receiving system to receive the synchronous signals, and then the synchronous signals are transmitted to the large illumination system;
The large-scale lighting system comprises a first lighting unit, a second lighting unit and a lighting unit N;
The synchronous receiving system comprises a second signal coupling circuit, an AGC amplifier, an NFDM demodulator and synchronous information output, wherein the large-scale lighting system and the AGC amplifier are electrically connected with the NFDM demodulator, and the AGC amplifier is electrically connected with the second signal coupling circuit.
Preferably, the synchronous transmitting center system includes signal clock synchronous information, an NFDM circuit, a power amplifying circuit and a first signal coupling circuit, the first power amplifying circuit and the first signal coupling circuit are electrically connected with the second signal coupling circuit, and the NFDM circuit is electrically connected with the first power amplifying circuit.
Preferably, the NFDM circuit is configured to perform NFDM modulation to modulate a synchronization signal into a modulation signal.
Preferably, NFDM modulation of the NFDM circuit employs a temporary frequency differential modulation (NFDM), wherein the amplitudes of two close-frequency sine waves are adjusted according to an initial symbol, and when the symbol changes, the amplitudes of the two sine waves alternate.
Preferably, the NFDM demodulator is configured for NFDM demodulation, which is the inverse of NFDM modulation, to restore the modulated signal to a synchronization signal.
Preferably, NFDM demodulation performed by the NFDM demodulator uses differential coherent demodulation of trigonometric function orthogonality to sample the signal using amplitude.
Compared with the prior art, the utility model has the following beneficial effects:
1. The utility model enables the large-scale lighting system to receive the signal sent by the synchronous sending center system through the arrangement of the synchronous sending center system, the synchronous receiving system and other structures, thereby improving the synchronous reliability of the lighting system.
2. The utility model utilizes the NFDM to transmit the internal time signal to the lighting system through the arrangement of the structures such as the NFDM circuit, the NFDM demodulator and the like, ensures the coexistence of synchronous communication lines of all lighting units and lighting power supplies, and improves the reliability of communication channels.
Drawings
Fig. 1 is a diagram of a power line carrier communication system of the present utility model;
FIG. 2 is a diagram of a synchronous transmission center system according to the present utility model;
FIG. 3 is a diagram of a synchronous receiving system according to the present utility model;
FIG. 4 is a waveform diagram of a symbol 1010 modulated according to the present utility model;
FIG. 5 is a schematic diagram of an NFDM modulation implementation of the present utility model;
fig. 6 is a diagram of NFDM demodulation signal of the present utility model.
In the figure: 1. a large-scale lighting system; 101. a first lighting unit; 102. a second lighting unit; 103. a lighting unit N;
2. A synchronous sending center system; 201. clock synchronization information; 202. NFDM circuitry; 203. a power amplifying circuit; 204. a first signal coupling circuit;
3. A synchronous receiving system; 301. a second signal coupling circuit; 302. an AGC amplifier; 303. NFDM demodulator; 304. and outputting synchronous information.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Referring to fig. 1-6, an outdoor lighting synchronization signal system based on NFDM PLC technology includes a large lighting system 1, the large lighting system 1 is electrically connected with a plurality of synchronous receiving systems 3, the plurality of synchronous receiving systems 3 are electrically connected with a synchronous transmitting center system 2, the synchronous transmitting center system 2 sends a synchronization signal to each synchronous receiving system 3 to receive the synchronization signal, and then the synchronization signal is transmitted to the large lighting system 1, the large lighting system 1 includes a first lighting unit 101, a second lighting unit 102 and a lighting unit N103, the synchronous receiving system 3 includes a second signal coupling circuit 301, an AGC amplifier 302, an NFDM demodulator 303 and a synchronization information output 304, the large lighting system 1 and the AGC amplifier 302 are electrically connected with the NFDM demodulator 303, and the AGC amplifier 302 is electrically connected with the second signal coupling circuit 301.
Referring to fig. 1-6, the synchronous transmitting center system 2 includes a signal clock synchronization information 201, an NFDM circuit 202, a power amplifying circuit 203 and a first signal coupling circuit 204, where the power amplifying circuit 203 and the first signal coupling circuit 204 are electrically connected to a second signal coupling circuit 301, and the NFDM circuit 202 and the power amplifying circuit 203 are electrically connected, and by setting structures such as the NFDM circuit 202 and the NFDM demodulator 303, an internal time signal is transmitted to the lighting system by using the NFDM, so that coexistence of synchronous communication lines and lighting power sources of each lighting unit is ensured, and reliability of a communication channel is improved.
Referring to fig. 1-6, NFDM circuit 202 is configured to modulate a synchronous signal into a modulated signal, NFDM modulation of NFDM circuit 202 employs a temporary frequency differential modulation (NFDM), two sine wave amplitudes near frequency are adjusted according to an initial symbol, when the symbol changes, the amplitudes of the two sine waves alternate, NFDM demodulator 303 is configured to perform NFDM demodulation, NFDM demodulation is an inverse operation of NFDM modulation, the modulated signal is restored into the synchronous signal, NFDM demodulation performed by NFDM demodulator 303 uses differential coherent demodulation of trigonometric function orthogonality, and the signal is sampled and decided by the amplitudes.
The specific implementation process of the utility model is as follows: the system utilizes a power line to transmit a synchronization signal, the power line is arranged at the place where each lighting unit is arranged, the synchronous transmitting center system 2 is responsible for transmitting clock synchronization information 201 modulated by NFDM to the power line, receiving the synchronization signal along the power line to each synchronous receiving system, and transmitting the synchronization signal to the large-scale lighting system 1, wherein the clock synchronization information 201 can be in various forms (can be set according to the system requirement), generally is clock information, appears in a time-division second format, and can be accurate to 0.01 second in time precision;
The near-frequency differential modulation (NFDM) technique adjusts the amplitudes of two close-frequency sinusoids according to an initial symbol, and when symbol m changes between "0" and "1", the amplitudes of the two sinusoids alternate. The modulator model is simplified as:
[y]＝[x1+x2]
That is, when the symbol signal is "1", the sine wave amplitude at the frequency fc1 is a, and the sine wave amplitude at the frequency fc2 is B. When the symbol signal is "0", the sine wave amplitude at the frequency fc1 is B, and the sine wave amplitude at the frequency fc2 is a. Only when the code element changes, the amplitude value can be changed, and the amplitude value does not change in the code element time.
Where Y l (t) represents the modulated signal of a "1" symbol and Y 0 (t) represents the modulated signal of a "0" symbol. The waveform of the modulated symbol 1010 is shown in fig. 4, in which two branches respectively generate signals with two frequencies during simulation analysis, the upper branch is a modulated signal x 1 (t) with the signal frequency fc1, and the lower branch is a modulated signal x 2 (t) with the signal frequency fc 2;
The synthesized modulated signal y (t), the binary value of the corresponding code element m is 1010, the values of A and B are 2 and 1 respectively, and the y (t) signal is taken as an integral synthesized signal, which comprises two adjacent carrier frequencies, when the two carrier frequencies are transmitted in a channel, the two carrier frequencies pass through links of the same route, such as various coupling links, antennas, cables, wired and wireless channels, amplifying and filtering circuits and the like, and in the whole signal transmission process, although the noise is interfered by external noise n (t), the interference mode of the noise on two carrier frequency signals in y (t) is basically similar, and the method can be realized by the method shown in fig. 5;
The power amplifying circuit 203 is a power amplifying circuit 203 commonly used in the communication technology, the first signal coupling circuit and the second signal coupling circuit are commonly used coupling circuits, and a transformer coupling mode can be adopted, which is the prior art, and the details are not repeated here;
NFDM modulates two carrier signals to represent a symbol together, and performs differential processing during demodulation, so that a simple coherence function can be constructed, as shown in equation 3, the reduction in equation 3 implements differential operation,
[sin(w1t)-sin(w2t)] (3)
Assuming that the signal at the transmitting end passes through the channel, the input noise is Gaussian white noise, the Gaussian white noise is output as narrow-band Gaussian white noise through the band-pass filter,
n(t)＝nc(t)cos wct-ni(t)sin wct (4)
The output waveform of the signal plus noise through the band pass filter can be expressed as r (t) as in equation 5
When the symbol "1" is transmitted,
When the transmission symbol is 0:
Making decision to obtain demodulation signal x (t), making decision "1" code greater than 0 and making decision "0" code less than 0,
It can be seen that this novel differential coherent demodulation using trigonometric orthogonality uses amplitude to sample the signal, and the demodulation apparatus is low cost, e.g., 1010 modulation symbols in fig. 6.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. Outdoor illumination synchronous signal system based on NFDM PLC technique, including large-scale lighting system (1), its characterized in that: the large-scale lighting system (1) is electrically connected with a plurality of synchronous receiving systems (3), the synchronous receiving systems (3) are electrically connected with a synchronous sending center system (2) together, the synchronous sending center system (2) sends synchronous signals to the synchronous receiving systems (3) to receive the synchronous signals, and then the synchronous signals are transmitted to the large-scale lighting system (1);
The large-scale lighting system (1) comprises a first lighting unit (101), a second lighting unit (102) and a lighting unit N (103);
The synchronous receiving system (3) comprises a second signal coupling circuit (301), an AGC amplifier (302), an NFDM demodulator (303) and a synchronous information output (304), wherein the large-scale lighting system (1) and the AGC amplifier (302) are electrically connected with the NFDM demodulator (303), and the AGC amplifier (302) is electrically connected with the second signal coupling circuit (301).
2. The outdoor lighting synchronization signal system based on NFDM PLC technology of claim 1, wherein: the synchronous transmitting center system (2) comprises signal clock synchronous information (201), an NFDM circuit (202), a power amplification circuit (203) and a first signal coupling circuit (204), wherein the power amplification circuit (203) and the first signal coupling circuit (204) are electrically connected with a second signal coupling circuit (301), and the NFDM circuit (202) is electrically connected with the power amplification circuit (203).
3. The outdoor lighting synchronization signal system based on NFDM PLC technology of claim 2, wherein: the NFDM circuit (202) is configured to NFDM modulate a synchronization signal into a modulated signal.
4. The outdoor lighting synchronization signal system based on NFDM PLC technology of claim 2, wherein: NFDM modulation of the NFDM circuit (202) employs temporary frequency differential modulation (NFDM), two sine wave amplitudes near frequency are adjusted according to an initial symbol, and when the symbol changes, the amplitudes of the two sine waves alternate.
5. The outdoor lighting synchronization signal system based on NFDM PLC technology of claim 1, wherein: the NFDM demodulator (303) is for NFDM demodulation, which is the inverse of NFDM modulation, to restore the modulated signal to a synchronization signal.
6. The outdoor lighting synchronization signal system based on NFDM PLC technology of claim 1, wherein: NFDM demodulation by the NFDM demodulator (303) uses differential coherent demodulation of trigonometric function orthogonality to sample the signal using amplitude.
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| CN202322778190.7U CN221127527U (en) | 2023-10-17 | 2023-10-17 | Outdoor illumination synchronous signal system based on NFDM PLC technology |
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| CN202322778190.7U CN221127527U (en) | 2023-10-17 | 2023-10-17 | Outdoor illumination synchronous signal system based on NFDM PLC technology |
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