CN117527028A - Communication system with stable power grid signal and use method thereof - Google Patents
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- H04B7/00—Radio transmission systems, i.e. using radiation field
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- H—ELECTRICITY
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- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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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
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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Abstract
The invention discloses a communication system with stable power grid signals and a use method thereof, wherein the communication system comprises a mobile communication base station and a distribution network data terminal; the distribution network data terminal is provided with a signal stable receiving module and a signal stable transmitting module; the signal stable receiving module receives signals of the mobile communication base station, the signals are amplified by the amplifying circuit, the impurities are removed by the filtering circuit, the frequency of the signals is amplified by the frequency spreading circuit, the frequency agile transceiver modulates the signal precision, the synchronous signal extraction of a TDD/FDD mode is realized by the FPGA module after the signals are subjected to digital-to-analog conversion, the amplification and the frequency spreading of the signal power are realized again by the quadrature modem and the power signal processing device, and finally the signals are transmitted to the ground modulation master station automation system; the signal stability transmitting module transmits signals from the ground-control master station automation system to the mobile communication base station in the mode, so that signal stability interaction is realized. The invention can realize the enhancement and filtration of the power grid signal, realize the bidirectional stable transmission and ensure that the ground control master station automation system operates normally.
Description
Technical Field
The invention belongs to the technical field of communication networks, and particularly relates to a communication system with stable power grid signals and a use method thereof.
Background
At present, the distribution line realizes the remote wireless telemetry, remote signaling and remote control communication of an automatic function, and is attached to a 4g communication module on a distribution terminal to communicate with a master station background so as to realize the up-transmission and down-transmission communication of automatic three-remote data. However, because certain technical defects exist in the communication module product of the automation equipment, the installation environment of the distribution network terminal is complex, and the stability of the distribution network terminal is greatly influenced by geographic position, temperature, humidity and special climate, the distribution network terminal is mainly characterized in that: 1. the objective problems of insufficient coverage rate of a base station and signal shielding of a closed metal box exist, so that 4g wireless mobile communication network signals are poor; the second communication module and part of the communication modules are in downtime caused by the fact that the performance of an operation chip or the cache is insufficient; thirdly, the communication module chip is unstable due to overheat under long-time work, and the hidden troubles lead to weak data signals and poor transmission efficiency, so that an automatic system of a ground dispatching master station can not monitor the real-time running state of a terminal to form a data blind area, and further a dispatcher can not observe or remotely control the automatic switching state or even influence the execution of a self-healing function to influence the safe and stable running of a power grid.
Disclosure of Invention
The invention aims to solve the problems that in the prior art, wireless signal transmission of a power distribution network is weak due to various reasons, so that an automatic system of a main regulating station cannot monitor the real-time running state of a terminal, a data blind area is formed and the like, and provides a communication system with stable power grid signals and a use method thereof. The invention can realize the enhancement and filtration of the power grid signal, achieves the aim of bidirectional stable transmission, and ensures that the ground-control master station automatic system can work normally.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a communication system with stable power grid signals comprises a mobile communication base station; the mobile communication base station is provided with a receiving and transmitting communication antenna; the system also comprises a distribution network data terminal; the distribution network data terminal is provided with a signal stable receiving module and a signal stable transmitting module; the signal stabilizing and receiving module is provided with a receiving antenna, an amplifying circuit, a filter circuit, a spread spectrum circuit, a frequency agile transceiver, an FPGA module and an automatic system of a ground adjustment master station; the receiving antenna corresponds to a receiving and transmitting antenna signal transmitting end of the mobile communication base station and receives signals of the mobile communication base station; the signal output end of the receiving antenna is electrically connected with the input end of the amplifying circuit; the output end of the amplifying circuit is electrically connected with the input end of the filtering circuit; the output end of the filter circuit is electrically connected with the input end of the spread spectrum circuit; the signal output end of the spread spectrum circuit is electrically connected with the signal input end of the frequency agile transceiver; the signal output end of the frequency agile transceiver is electrically connected with the input end of the FPGA module; the FPGA module is also electrically connected with a quadrature modem; the output end of the quadrature modem is electrically connected with a power signal processing device; the signal output end of the power signal processing device is connected with the signal receiving end of the ground adjustment master station automation system; the signal stabilizing transmitting module comprises a transmitting antenna, an amplifying circuit, a filtering circuit, a spread spectrum circuit, a frequency agile transceiver, an FPGA module, a quadrature modem and a power signal processing device which are the same as the signal stabilizing receiving module; the signal stable transmitting module transmits signals to the mobile communication base station from the ground-control master station automation system by the same signal processing flow as the signal stable receiving module.
As a further technical improvement, the distribution network data terminal is also provided with two groups of multi-frequency combiners; the multi-frequency combiner is connected between the power signal processing device of the signal stable receiving module and the ground-control master station automation system in an electric connection mode; the other group of multi-frequency combiner is connected between the power signal processing device of the signal stable transmitting module and the transmitting antenna in an electric connection mode. The multi-frequency combiner supports signal processing and spread spectrum of a plurality of frequency bands and provides a plurality of selectable communication signals for the distribution network data terminal.
As a further technical improvement, the signal stable receiving module and the signal stable transmitting module are also provided with two-stage spread spectrum circuits; the first stage of the two-stage spread spectrum circuit is biased in class A; the second stage of the two-stage spread spectrum circuit is biased in class AB. A circuit architecture of two-stage spread spectrum is adopted, so that enough spread spectrum is provided; the first-stage spread spectrum circuit has small working current and little influence on the efficiency of the whole circuit, so the bias is in class A; the second stage spread spectrum circuit is biased in class AB, seeking greater efficiency without causing excessive distortion.
As a further technical improvement, the signal stable receiving module and the signal stable transmitting module are also provided with a feedback circuit; the feedback circuit is a parallel negative feedback circuit.
As a further technical improvement, the signal stable receiving module and the signal stable transmitting module are also provided with a broadband matching circuit; the broadband matching circuit adopts an equal Q value method to design two-stage L-shaped matching. The input and interstage networks are band-pass networks, which play roles in selecting working frequency bands and suppressing out-of-band signals, and the output network is a low-pass network.
The use method of the communication system with stable power grid signals comprises the following steps:
and (3) data receiving: the mobile communication base station sends out a wireless signal in the downlink direction through the receiving and transmitting communication antenna, and the wireless signal is received by a receiving antenna connected with a signal stabilizing receiving module of the data terminal of the distribution network; then amplified by an amplifying circuit in the form of analog signals, so that weak signals in the signals are amplified; the signal is subjected to impurity removal through a filter circuit, and then the frequency of the signal is enhanced under the action of a frequency agile transceiver; simultaneously converting the analog signals into digital signals and transmitting the digital signals to an FPGA module, wherein the FPGA module realizes that synchronous signals in a TDD/FDD mode extract a TDD/FDD mode; the FPGA module transmits signal information to the quadrature modem, amplification and spread spectrum of signal power are realized again through the quadrature modem and the power signal processing device, and finally, the signal is transmitted to the ground-control master station automation system, so that the ground-control master station automation system acquires data information sent by the mobile communication base station;
and (3) data transmission: the client sends out an uplink signal, and then the signal is amplified by an amplifying circuit of the signal stabilizing transmitting module in the form of an analog signal, and the signal information is transmitted to the transmitting antenna after being processed in the same data processing mode as in the data receiving step; the transmitting antenna transmits the signal information to the mobile communication base station in the form of wireless signals; thus, the bidirectional stable interaction of the signal data between the mobile communication base station and the client is realized.
The FPGA module performs partial demodulation on the received 12-bit digital signal, then searches PSS to obtain 5ms timing information, OFDM symbol time and the like, searches SSS to obtain 10ms timing information and cell group ID, and performs more accurate time and frequency synchronization; next, for reading MIB and SIB information, obtaining information such as the uplink and downlink time slot ratio of TDD and special subframe format in the SIB information; the method comprises the steps of realizing the extraction of a TDD mode synchronous signal, wherein the signal is used for controlling the uplink and downlink working time slots of a signal processing device, and ensuring strict synchronization with a base station signal; and through an FIR digital filter designed by an FPGA, the output of the filter is connected with the D/A of the transceiver and is recovered to be an analog signal, so that the communication signal receiving and transmitting processing with high selectivity and excellent anti-interference performance is realized.
The technical scheme of the invention has the following beneficial effects:
the invention carries out multiple amplification, filtration and conversion treatment on weak signals generated by the communication equipment due to the reasons of circuit, metal shielding, delay, equipment failure and the like in the working process by a series of signal processing modes such as signal receiving, amplifying, filtering, spread spectrum, digital-analog conversion and the like of the mobile communication base station, so that an automatic system of a ground-control master station can receive accurate signal information, and simultaneously transmits signals in the same way, thereby ensuring stable transmission and reception of uplink signals and downlink signals, ensuring smooth power grid communication and normal and orderly operation of each part.
Drawings
FIG. 1 is a schematic overall flow diagram of the apparatus of the present invention.
Fig. 2 is a schematic diagram of a parallel feedback circuit.
Fig. 3 is a schematic diagram of a two-stage L-type matching network.
Fig. 4 is a schematic circuit diagram of a matching network in an embodiment.
Fig. 5 is a diagram of simulation and actual measurement results of testing S parameters of a signal processing apparatus using a keysight e 5071C-type network analyzer.
Fig. 6 is a schematic diagram showing saturated output power and power added efficiency test results of the signal processing device.
Fig. 7 is a schematic diagram of test results of output power of the signal processing device at the output third-order intermodulation point and the 1dB compression point.
Fig. 8 is a schematic diagram showing the power ratio of adjacent channels of the signal processing device tested at three frequency points of 2.6, 3.6 and 4.9 GHz.
Fig. 9 is one of the code simulation response waveforms of MATLAB implementing FIR digital filters.
Fig. 10 is a second waveform diagram of a code simulation response of a MATLAB implemented FIR digital filter.
Fig. 11 is a schematic diagram of a two-stage spread spectrum circuit.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Embodiment one:
as shown in fig. 1 to 11, a communication system with stable power grid signals comprises a mobile communication base station; the mobile communication base station is provided with a receiving and transmitting communication antenna; the system also comprises a distribution network data terminal; the distribution network data terminal is provided with a signal stable receiving module and a signal stable transmitting module; the signal stabilizing and receiving module is provided with a receiving antenna, an amplifying circuit, a filter circuit, a spread spectrum circuit, a frequency agile transceiver, an FPGA module and an automatic system of a ground adjustment master station; the receiving antenna corresponds to a receiving and transmitting antenna signal transmitting end of the mobile communication base station and receives signals of the mobile communication base station; the signal output end of the receiving antenna is electrically connected with the input end of the amplifying circuit; the output end of the amplifying circuit is electrically connected with the input end of the filtering circuit; the output end of the filter circuit is electrically connected with the input end of the spread spectrum circuit; the signal output end of the spread spectrum circuit is electrically connected with the signal input end of the frequency agile transceiver; the signal output end of the frequency agile transceiver is electrically connected with the input end of the FPGA module; the FPGA module is also electrically connected with a quadrature modem; the output end of the quadrature modem is electrically connected with a power signal processing device; the signal output end of the power signal processing device is connected with the signal receiving end of the ground adjustment master station automation system; the signal stabilizing transmitting module comprises a transmitting antenna, an amplifying circuit, a filtering circuit, a spread spectrum circuit, a frequency agile transceiver, an FPGA module, a quadrature modem and a power signal processing device which are the same as the signal stabilizing receiving module; the signal stable transmitting module transmits signals to the mobile communication base station from the ground-control master station automation system by the same signal processing flow as the signal stable receiving module.
The distribution network data terminal is also provided with two groups of multi-frequency combiners; the multi-frequency combiner is connected between the power signal processing device of the signal stable receiving module and the ground-control master station automation system in an electric connection mode; the other group of multi-frequency combiner is connected between the power signal processing device of the signal stable transmitting module and the transmitting antenna in an electric connection mode. The multi-frequency combiner supports signal processing and spread spectrum of a plurality of frequency bands and provides a plurality of selectable communication signals for the distribution network data terminal.
The signal stable receiving module and the signal stable transmitting module are also provided with two-stage spread spectrum circuits; the first stage of the two-stage spread spectrum circuit is biased in class A; the second stage of the two-stage spread spectrum circuit is biased in class AB. As shown in fig. 11, a circuit architecture employing two-stage spreading provides sufficient spreading; the first-stage spread spectrum circuit has small working current and little influence on the efficiency of the whole circuit, so the bias is in class A; the second stage spread spectrum circuit is biased in class AB, seeking greater efficiency without causing excessive distortion.
The signal stable receiving module and the signal stable transmitting module are also provided with a feedback circuit; the feedback circuit is a parallel negative feedback circuit. As shown in FIG. 2, xi is input excitation, xo is output response, A is the spread spectrum multiple of the signal processing device, beta is the spread spectrum multiple of the negative feedback network, and the transmission relation of the system under the negative feedback circuit is that
When Aβ is not less than 1, 1+Aβ is not less than Aβ, formula (1) may be represented as
As can be derived from equation (2), the overall system characteristics are almost solely determined by the negative feedback network after it has been added.
According to the invention, the collector and the base of the stacked HBT are connected with the RC negative feedback network in series, and the feedback network formed by passive elements can improve the integral linearity of the system.
The negative feedback has an expanding effect on the frequency band of the signal processing device. Assuming no negative feedback network, the baud (Bode) diagram of the signal processing device has only one inflection point at the low frequency band and the high frequency band, respectively. In the high frequency band, the spread spectrum multiple (Ah) of the signal processing device is
Wherein: am is the spread spectrum multiple of the signal processing device in the intermediate frequency band; fH is the upper limit operating frequency of the signal processing device, and f is the actual operating frequency. The formula (3) is substituted into the formula (1), and after negative feedback is introduced, the high-frequency band spread spectrum multiple (Xo/Xi) h of the system is
At this time, the spread spectrum multiple of the intermediate frequency band of the system becomes Am/(1+amb), and the upper limit operating frequency of the system is fH (1+amb), which is increased by (1+amb) times as compared with the upper limit operating frequency (fH) of the signal processing apparatus without negative feedback. By the same token, after negative feedback is introduced, the lower limit working frequency of the system can be reduced to 1/(1+Ambeta) of the lower limit working frequency of the signal processing device, so that the frequency band of the signal processing device can be widened by the negative feedback structure.
The signal stable receiving module and the signal stable transmitting module are also provided with a broadband matching circuit; the broadband matching circuit adopts an equal Q value method to design two-stage L-shaped matching. The input and interstage networks are band-pass networks, which play roles in selecting working frequency bands and suppressing out-of-band signals, and the output network is a low-pass network.
Under the standard that 3dB bandwidth f (3 dB) =2.5 GHz of the matching network, the loading quality factor (QL) of the matching network at the center frequency f0=3.75 GHz is
When the QL value of the matching network design is controlled below 1.5, the matching network has good broadband characteristics.
A prototype of the design of a two-stage L-type matching network is shown in fig. 3. The source Resistance (RS) and the load Resistance (RL) are matched to an intermediate real impedance (ZV), and X1, X2, X3 and X4 are reactances to achieve impedance transformation. The derivation process of the two-stage L-shaped matching designed by the equal Q value method is as follows.
Then
Is available in the form of
Taking the actual design of the output matching network as an example, the designed matching circuit is shown in fig. 4, cb is an output blocking capacitor, LRFC is a radio frequency choke inductance connecting the collector of the transistor to the power supply, L1 and L2 are first and second inductances in the output matching network, zopt is the optimal load impedance of the second stage, zv and out are intermediate impedances of the output matching network, C1 and C2 are first and second capacitances in the output matching network, rload is a system load resistance, rload=50Ω, and Zload is an impedance of Rload connected in series Cb and then in parallel with LRFC along the wave source direction. The capacitance of Cb is large, LRFC is also large, and for rf signals, zload=rload=50Ω is considered as a short circuit and an open circuit, respectively. Considering the output power level, zopt was designed to 10Ω, and substitution into equation (9) gave a minimum Q value of 1.11, which was designed using the equal Q value method. And after the matching network is connected in parallel with the equivalent source impedance, QL is smaller than 1.11. Substituting q=1.11 into equation (10), and combining the reactance calculation formulas of the capacitance and inductance, l1=0.47 nh, c1=2.1pf, l2=1.05 nh, c2=0.95 pF can be obtained. The input matching network in the whole circuit transforms the system source impedance value 50 omega to 16 omega, and the interstage matching network transforms the second-stage input impedance value 1.8 omega to the first-stage load impedance value 8 omega. It can be seen that the impedance transformation ratio of the input and inter-stage matching networks is smaller than that of the output matching network, and that the Q value is lower than that of the output matching network, i.e. the design bandwidth of both the input and inter-stage matching networks is larger than that of the output matching network, as obtained by equation (9). The chip and the substrate are connected through gold wire bonding, after QFN packaging, tin is attached to a Printed Circuit Board (PCB) made of RO4350 material, calibration is completed before testing, and board damage and coaxial line damage are removed. The chip operating voltage was 5V and the quiescent operating current was 96mA. S parameters of the signal processing device are tested by using a Keysight 5071C network analyzer, simulation and actual measurement results of the S parameters are shown in fig. 5, S21 is small signal spread spectrum, and S11 and S22 are input return loss and output return loss respectively. As can be seen from FIG. 5, the signal processing device has S11 < -8dB, S22 < -10dB and 25dB < S21 < 29dB in the working frequency range of 2.5-5 GHz. The simulation and actual measured S21 values and frequency ranges have better consistency. The signal processing device is absolutely stable in the operating frequency band. Outside the operating band, S22 has a bump at a relatively low frequency (823 MHz) of-0.6 dB. The bump consideration is formed by the influence of parasitic parameters on the output matching network on the substrate. The saturated output power (psa) and the power added efficiency (ηpae) of the signal processing apparatus were obtained by taking the output power at 4dB of spread spectrum compression as the saturated output power, and the test results are shown in fig. 6. The signal processing device has the Psat of 26.3-27.5 dBm in the working frequency band, and the eta PAE of 32-40% in the saturated working, so as to reach the higher power additional efficiency level. Based on a test platform built by a Keysight 5182A signal generator and a Keysight 9030A spectrum analyzer, the results of testing the output third-order intermodulation point (OIP 3) and the 1dB compression point output power (Po (1 dB)) of the signal processing device are shown in FIG. 7. In the OIP3 test, the input power of two single-tone signals is 0dBm, the double-tone interval is 1MHz, and the OIP3 of each test frequency point is larger than 30.5dBm. Under the single-tone input test, po (1 dB) of each test frequency point is larger than 24dBm. The continuous wave signal was input, and the output power (Pout), spread spectrum (G), and ηpae of the signal processing apparatus as a function of the input power (Pin) were tested at the frequency points of 2.6, 3.6, and 4.9GHz, and the results are shown in fig. 7. It can be seen that there is little fluctuation in spreading as the input power increases, before spreading compression occurs. In the test of the modulation signal, the 4G-LTE, time division duplex, downlink and 20MHz modulation signal is adopted, and the Adjacent Channel Power Ratio (ACPR) result of the signal processing device is obtained by testing at three frequency points of 2.6, 3.6 and 4.9GHz, and is shown in figure 8. From the test results, it can be seen that the ACPR is about-38 dBc at an output power of 15dBm of the signal processing device.
The invention relates to a broadband high-spread spectrum signal processing device. The bandwidth of 2.5-5 GHz is realized by adopting an LC matching network with a second-order equal Q value and a parallel negative feedback circuit. The signal processing device is absolutely stable in a designed frequency band, the spread spectrum of a small signal is larger than 25dB, the saturated output power is larger than 26dBm, the power additional efficiency is larger than 32%, the output power of a 1dB compression point is larger than 24dBm, and the output third-order intermodulation point is larger than 30.5dBm. The signal processing device is tested for modulation signals at three key frequency points of 2.6, 3.6 and 4.9GHz, when the output power is 15dBm, the ACPR is about-38 dBc, and at 4.9GHz, the ACPR reaches-40 dBc, thereby meeting the index requirements of a typical signal processing device in a 5G medium frequency band and having wide market application prospect.
The application method of the invention is as follows:
and (3) data receiving: the mobile communication base station sends out a wireless signal in the downlink direction through the receiving and transmitting communication antenna, and the wireless signal is received by a receiving antenna connected with a signal stabilizing receiving module of the data terminal of the distribution network; then amplified by an amplifying circuit in the form of analog signals, so that weak signals in the signals are amplified; the signal is subjected to impurity removal through a filter circuit, and then the frequency of the signal is enhanced under the action of a frequency agile transceiver; simultaneously converting the analog signals into digital signals and transmitting the digital signals to an FPGA module, wherein the FPGA module realizes that synchronous signals in a TDD/FDD mode extract a TDD/FDD mode; the FPGA module transmits signal information to the quadrature modem, amplification and spread spectrum of signal power are realized again through the quadrature modem and the power signal processing device, and finally, the signal is transmitted to the ground-control master station automation system, so that the ground-control master station automation system acquires data information sent by the mobile communication base station;
and (3) data transmission: the client sends out an uplink signal, and then the signal is amplified by an amplifying circuit of the signal stabilizing transmitting module in the form of an analog signal, and the signal information is transmitted to the transmitting antenna after being processed in the same data processing mode as in the data receiving step; the transmitting antenna transmits the signal information to the mobile communication base station in the form of wireless signals; thus, the bidirectional stable interaction of the signal data between the mobile communication base station and the client is realized.
The FPGA module performs partial demodulation on the received 12-bit digital signal, then searches PSS to obtain 5ms timing information, OFDM symbol time and the like, searches SSS to obtain 10ms timing information and cell group ID, and performs more accurate time and frequency synchronization; next, for reading MIB and SIB information, obtaining information such as the uplink and downlink time slot ratio of TDD and special subframe format in the SIB information; the method comprises the steps of realizing the extraction of a TDD mode synchronous signal, wherein the signal is used for controlling the uplink and downlink working time slots of a signal processing device, and ensuring strict synchronization with a base station signal; and through an FIR digital filter designed by an FPGA, the output of the filter is connected with the D/A of the transceiver and is recovered to be an analog signal, so that the communication signal receiving and transmitting processing with high selectivity and excellent anti-interference performance is realized.
Filter Design simulation tool adopting MATLAB, and designing index of band-pass Filter as
w p1 ＝0.35π,w p2 ＝0.8π,
w s1 ＝0.2π,w s2 ＝0.65π,A s ＝60dB
Fig. 9 and 10 show the code simulation response waveforms of MATLAB implemented FIR digital filters, and it can be seen that the receiver sensitivity of the receiving unit, which is the ability of the receiver to identify the minimum signal, is measured. The signal information can only be correctly demodulated if the received signal level strength is higher than the sensitivity of the receiver. Because the intensity of the echo signal which can be received by the receiving antenna is very small in communication, a receiver used in communication needs to have high sensitivity (small sensitivity value) so as to be beneficial to successful communication.
The sensitivity calculation formula of the receiving system is as follows:
S＝101g(KTB)+NF+SNR
on the premise that two factors of KTB and SNR are not easy to change, the noise coefficient of the receiving system can only be reduced to improve the sensitivity of the receiving system. The receiving system can be regarded as a system formed by serially connecting n stages of circuits, and the total noise coefficient is as follows:
as can be seen from the formula, the signal to noise ratio of the signal can be greatly improved by adding the front-end Low Noise Amplifier (LNA), and the improvement of the receiving effect is to improve the sensitivity of the receiving system, and the low noise amplifier is mainly manufactured by selecting a low noise coefficient receiver and adding the front-end and adopting low noise field effect devices such as GaAsFET or HEMTFET.
The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of parts may be made to the present invention within the spirit and scope of the invention, and such modifications and equivalents should be considered to fall within the scope of the invention.
In the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "inner", "front", "rear", "left", "right", etc., are based on directions or positional relationships shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of describing the present invention and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed", "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected or integrally connected; the mechanical connection and the electrical connection can be adopted; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
Claims (7)
1. A communication system with stable power grid signals comprises a mobile communication base station; the mobile communication base station is provided with a receiving and transmitting communication antenna; the method is characterized in that: the system also comprises a distribution network data terminal; the distribution network data terminal is provided with a signal stable receiving module and a signal stable transmitting module;
the signal stabilizing and receiving module is provided with a receiving antenna, an amplifying circuit, a filter circuit, a spread spectrum circuit, a frequency agile transceiver, an FPGA module and an automatic system of a ground adjustment master station; the receiving antenna corresponds to a receiving and transmitting antenna signal transmitting end of the mobile communication base station and receives signals of the mobile communication base station; the signal output end of the receiving antenna is electrically connected with the input end of the amplifying circuit; the output end of the amplifying circuit is electrically connected with the input end of the filtering circuit; the output end of the filter circuit is electrically connected with the input end of the spread spectrum circuit; the signal output end of the spread spectrum circuit is electrically connected with the signal input end of the frequency agile transceiver; the signal output end of the frequency agile transceiver is electrically connected with the input end of the FPGA module; the FPGA module is also electrically connected with a quadrature modem; the output end of the quadrature modem is electrically connected with a power signal processing device; the signal output end of the power signal processing device is connected with the signal receiving end of the ground adjustment master station automation system;
the signal stabilizing transmitting module comprises a transmitting antenna, an amplifying circuit, a filtering circuit, a spread spectrum circuit, a frequency agile transceiver, an FPGA module, a quadrature modem and a power signal processing device which are the same as the signal stabilizing receiving module; the signal stable transmitting module transmits signals to the mobile communication base station from the ground-control master station automation system by the same signal processing flow as the signal stable receiving module.
2. The grid signal stabilization communication system of claim 1, wherein: the distribution network data terminal is also provided with two groups of multi-frequency combiners; the multi-frequency combiner is connected between the power signal processing device of the signal stable receiving module and the ground-control master station automation system in an electric connection mode; the other group of multi-frequency combiner is connected between the power signal processing device of the signal stable transmitting module and the transmitting antenna in an electric connection mode.
3. The grid signal stabilization communication system of claim 1, wherein: the signal stable receiving module and the signal stable transmitting module are also provided with two-stage spread spectrum circuits; the first stage of the two-stage spread spectrum circuit is biased in class A; the second stage of the two-stage spread spectrum circuit is biased in class AB.
4. The grid signal stabilization communication system of claim 1, wherein: the signal stable receiving module and the signal stable transmitting module are also provided with a feedback circuit; the feedback circuit is a parallel negative feedback circuit.
5. The grid signal stabilization communication system of claim 1, wherein: the signal stable receiving module and the signal stable transmitting module are also provided with a broadband matching circuit; the broadband matching circuit adopts an equal Q value method to design two-stage L-shaped matching.
6. Use of a communication system for stabilizing a power grid signal according to any one of claims 1 to 5, comprising the steps of:
1) And (3) data receiving: the mobile communication base station sends out a wireless signal in the downlink direction through the receiving and transmitting communication antenna, and the wireless signal is received by a receiving antenna connected with a signal stabilizing receiving module of the data terminal of the distribution network; then amplified by an amplifying circuit in the form of analog signals, so that weak signals in the signals are amplified; the signal is subjected to impurity removal through a filter circuit, and then the frequency of the signal is enhanced under the action of a frequency agile transceiver; simultaneously converting the analog signals into digital signals and transmitting the digital signals to an FPGA module, wherein the FPGA module realizes that synchronous signals in a TDD/FDD mode extract a TDD/FDD mode; the FPGA module transmits signal information to the quadrature modem, amplification and spread spectrum of signal power are realized again through the quadrature modem and the power signal processing device, and finally, the signal is transmitted to the ground-control master station automation system, so that the ground-control master station automation system acquires data information sent by the mobile communication base station;
2) And (3) data transmission: the client sends out an uplink signal, and then the signal is amplified by an amplifying circuit of the signal stabilizing transmitting module in the form of an analog signal, and the signal information is transmitted to the transmitting antenna after being processed in the same data processing mode as in the data receiving step; the transmitting antenna transmits the signal information to the mobile communication base station in the form of wireless signals; thus, the bidirectional stable interaction of the signal data between the mobile communication base station and the client is realized.
7. The grid signal stabilization communication system of claim 6, wherein: the FPGA module performs partial demodulation on the received 12-bit digital signal, then searches PSS to obtain 5ms timing information, OFDM symbol time and the like, searches SSS to obtain 10ms timing information and cell group ID, and performs more accurate time and frequency synchronization; next, for reading MIB and SIB information, obtaining information such as the uplink and downlink time slot ratio of TDD and special subframe format in the SIB information; the method comprises the steps of realizing the extraction of a TDD mode synchronous signal, wherein the signal is used for controlling the uplink and downlink working time slots of a signal processing device, and ensuring strict synchronization with a base station signal; and through an FIR digital filter designed by an FPGA, the output of the filter is connected with the D/A of the transceiver and is recovered to be an analog signal, so that the communication signal receiving and transmitting processing with high selectivity and excellent anti-interference performance is realized.
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| CN202311572914.0A CN117527028A (en) | 2023-11-23 | 2023-11-23 | Communication system with stable power grid signal and use method thereof |
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| CN202311572914.0A CN117527028A (en) | 2023-11-23 | 2023-11-23 | Communication system with stable power grid signal and use method thereof |
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