Distributed network management system based on power line carrier and wireless dual-mode communication

Abstract

The invention provides a distributed network management system based on power line carrier and wireless dual-mode communication, and belongs to the field of information communication. The problem of unstable signal transmission is solved; the signal acquisition module is used for acquiring a baseband signal and judging the type of the baseband signal; if the signal is a digital signal, entering a digital signal communication module; if the signal is an analog signal, entering an analog signal communication module; the digital signal communication module is used for converting the baseband signal into a high-frequency carrier signal; adjusting the signal strength of the high-frequency carrier signal in the signal transmission process according to the power transmission parameters; the analog signal communication module is used for converting the baseband signal into a to-be-sent signal; distributing a relay node for the target area; the signals to be sent are sent according to the sequence of the sending end, the relay node and the receiving end; the continuous updating module is used for acquiring and updating a baseband signal; according to the invention, the baseband signal is transmitted from the transmitting end to the receiving end by acquiring and processing the baseband signal, so that the stability of signal transmission is improved.

Description

Technical Field

[0001] The invention discloses a distributed network management system based on power line carrier and wireless dual-mode communication, and relates to the field of information communication. Background Art

[0002] The existing network management systems for power line carrier or wireless dual-mode communication have the following shortcomings:

[0003] System complexity: The dual-mode communication mechanism increases the complexity of the system. It is necessary to maintain both power line carrier and wireless communication at the same time, which increases the difficulty and cost of system management and maintenance.

[0004] Signal attenuation problem: When the existing network management system performs power line carrier communication, it will increase the load on the power line and have less intervention in the signal transmission process, resulting in a shortened transmission distance and increased signal attenuation.

[0005] Noise interference and frequency selection issues: Power line carrier communication is easily affected by various noises and interferences on the power line, affecting the quality of data transmission; although wireless communication is highly flexible, it is also easily interfered by the external electromagnetic environment, especially in complex environments such as cities, where signal attenuation and noise interference are more prominent. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention aims to provide a distributed network management system based on power line carrier and wireless dual-mode communication, aiming to solve the problem of unstable signal transmission.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: A distributed network management system based on power line carrier and wireless dual-mode communication includes:

[0008] Signal acquisition module: used to acquire baseband signals and determine the type of baseband signals;

[0009] If the baseband signal is a digital signal, it enters the digital signal communication module;

[0010] If the baseband signal is an analog signal, it enters the analog signal communication module;

[0011] Digital signal communication module: used to convert the baseband signal into a high-frequency carrier signal through orthogonal frequency division multiplexing modulation technology; obtain the power transmission parameters of the target area; according to the power transmission parameters, adjust the signal strength of the high-frequency carrier signal from the transmitting end to the receiving end until the receiving end successfully receives the high-frequency carrier signal;

[0012] Analog signal communication module: used to re-encode and encrypt the baseband signal to obtain the signal to be sent; divide the target area into 4 areas according to the location of the sending end, and allocate relay nodes to each area according to the bandwidth and packet loss rate of the network nodes in each area; send the signal to be sent in the order of sending end-relay node-receiving end until the receiving end receives all the signals to be sent;

[0013] Continuous update module: used to continuously acquire baseband signals and synchronously update baseband signals.

[0014] Furthermore, the specific process of the digital signal communication module is as follows:

[0015] Process A1: The baseband signal is a digital signal; orthogonal frequency division multiplexing modulation technology is used to convert the baseband signal into a high-frequency carrier signal;

[0016] Process A2: using a coupler to couple the high frequency carrier signal to the power line;

[0017] Get the receiving voltage at the transmitting end, denoted as vo; the receiving voltage at the receiving end, denoted as vi;

[0018] Calculate the maximum attenuation of the high-frequency carrier signal, recorded as dB(max); the calculation formula for dB(max) is as follows:

[0019] dB(max)=20×lg (vo / vi) ;

[0020] Process A3: Obtain the output sound pressure of the high-frequency carrier signal at the transmitting end, recorded as dBo;

[0021] Get the number of amplifiers between the transmitter and the receiver, denoted as am;

[0022] Obtain the signal amplification factors corresponding to the 1st to am-th amplifiers, which are recorded as add(1), add(2) to add(am); wherein add(1) represents the signal amplification factor of the 1st amplifier; add(2) represents the signal amplification factor of the 2nd amplifier; and so on, add(am) represents the signal amplification factor of the am-th amplifier;

[0023] Get the total length of the wire from the transmitter to the receiver, denoted as L;

[0024] Get the length of the wire from the transmitter to the first amplifier, recorded as L(f-1);

[0025] Get the length of the wire between the first and second amplifiers, recorded as L(1-2);

[0026] Get the length of the wire between the second and third amplifiers, recorded as L(2-3);

[0027] Similarly, the length of the wire between the am-th amplifier and the receiving end is obtained, which is recorded as L(am-z);

[0028] L(f-1)+L(1-2)+L(2-3)+……+L(am-z)=L;

[0029] Process A4: Summarize the data in processes A2 to A3 as power transmission parameters; adjust the signal strength of the high-frequency carrier signal between the wires according to the power transmission parameters until the receiving end successfully receives the high-frequency carrier signal;

[0030] Process A5: Use FFT transformation to process the high-frequency carrier signal received by the receiving end to complete signal communication.

[0031] Furthermore, the specific process of process A1 is as follows:

[0032] Process A11: obtaining a signal bandwidth of a transmitting end as a total bandwidth; obtaining a signal bandwidth of a receiving end as a sub-bandwidth;

[0033] The total bandwidth is denoted as tob and the sub-bandwidth is denoted as sub;

[0034] The baseband signal is divided into data streams, each data stream corresponds to a subcarrier signal; the number of subcarrier signals is denoted as sca; sca = tob / sub; sca is rounded up;

[0035] Process A12: back up the subcarrier signal to obtain subcarrier signal A and subcarrier signal B;

[0036] Perform PSK modulation on each subcarrier signal in subcarrier signal A to obtain a modulated signal;

[0037] The modulation signals are denoted as X[1], X[2] to X[sca]; wherein X[1] represents the first modulation signal; X[2] represents the second modulation signal; and so on, X[sca] represents the scath modulation signal;

[0038] Assume that the output of IFFT transformation is fX[n], where fX[n] represents the time domain signal corresponding to the nth modulation signal; wherein n represents the index of the time domain signal, and the value range of n is 1 to sca;

[0039] Process A13: Use IFFT transform to convert the modulated signal into a time domain signal. The mathematical expression of IFFT transform is as follows:

[0040] Wherein, X[k] represents the kth modulation signal, k represents the index of the modulation signal, and the value range of k is 1 to sca; j(k, n) represents the coefficient of the square root of the complex number, and the mathematical expression of j(k, n) is as follows:

[0041] Where j represents the imaginary unit (i.e. j 2 =-1), π represents pi;

[0042] Substituting X[1]~X[sca] into the mathematical expression of IFFT transformation, we can obtain time domain signals fX[1], fX[2]~fX[sca]; where fX[1] represents the time domain signal corresponding to the first modulation signal; fX[2] represents the time domain signal corresponding to the second modulation signal; and so on, fX[sca] represents the time domain signal corresponding to the scath modulation signal;

[0043] Let fX[1]~fX[sca] be high-frequency signals.

[0044] Furthermore, the subsequent process of the process A13 is as follows:

[0045] Process A14: The subcarrier signals in the subcarrier signal B are recorded as S[1], S[2] to S[sca]; wherein S[1] represents the first subcarrier signal; S[2] represents the second subcarrier signal; and so on, S[sca] represents the sca-th subcarrier signal; S[1], S[2] to S[sca]∈{0,1};

[0046] The digital signal and the high-frequency signal are modulated by a modulator to obtain a high-frequency carrier signal;

[0047] Assume that the i-th modulation signal is S[i], S[i]∈{0,1}, i represents the index of the subcarrier signal, and the value range of i is 1~sca;

[0048] Assume that the modulated high-frequency carrier signal is mm(q), where q represents the index of the high-frequency carrier signal, and the value range of q is: 1 to sca;

[0049] The modulation mathematical expression for modulating the i-th modulation signal and the n-th high-frequency signal is:

[0050] mm(q)=S[i]×fX[n], i=n; wherein n represents the index of the time domain signal;

[0051] Substituting S[1]~S[sca] and fX[1]~fX[sca] into the modulation mathematical expression, we can obtain the high-frequency carrier signals mm(1), mm(2)~mm(sca);

[0052] Among them, mm(1) represents the first high-frequency carrier signal; mm(2) represents the second high-frequency carrier signal; and so on, mm(sca) represents the scath high-frequency carrier signal.

[0053] Furthermore, the specific process of process A4 is as follows:

[0054] Process A41: obtaining the sound pressure of the high-frequency carrier signal at the transmitting end, denoted as ii;

[0055] Get the density of the wires, denoted as ρ; calculate the rated high-frequency carrier signal strength at the receiving end, denoted as dB(z). The calculation formula for dB(z) is as follows:

[0056] dB(z)=ii 2 ×ρ×c; where c represents the speed of sound;

[0057] The high-frequency carrier signal strength at the transmitting end is expressed as dB(f). The calculation formula for dB(f) is as follows:

[0058] dB(f)=dB(z)+dB(max);

[0059] Process A42: from the sending end to the first amplifier;

[0060] Process A421: Calculate the rated attenuation from the transmitter to the first amplifier, recorded as ΔdB(f-1); the calculation formula of ΔdB(f-1) is as follows:

[0061] ΔdB(f-1)=[L(f-1) / L]×dB(max);

[0062] Process A422: Obtain the signal strength of the high-frequency carrier signal transmitted to the first amplifier, denoted as nbB(f-1);

[0063] Process A423: Determine the size of nbB(f-1) and [dB(f)-ΔdB(f-1)];

[0064] If nbB(f-1) is less than [dB(f)-ΔdB(f-1)], the high frequency carrier signal is enhanced and the process A424 is entered;

[0065] If nbB(f-1) is greater than or equal to [dB(f)-ΔdB(f-1)], no processing is done;

[0066] Process A424: The signal strength after the first amplifier is amplified is recorded as ddB(f-1);

[0067] Calculate the decay coefficient of nbB(f-1) relative to [dB(f) - ΔdB(f-1)], recorded as da(f-1); the calculation formula of da(f-1) is as follows:

[0068] da(f-1)=1-{nbB(f-1) / [dB(f)-ΔdB(f-1)]};

[0069] Compare da(f-1) and add(1) to determine the calculation formula of ddB(f-1);

[0070] If da(f-1)≤add(1), the calculation formula of ddB(f-1) is; ddB(f-1)=(1+da(f-1))×nbB(f-1);

[0071] If da(f-1)>add(1), the calculation formula of ddB(f-1) is: ddB(f-1)=(1+add(1))×nbB(f-1);

[0072] Process A43: 1st amplifier to 2nd amplifier;

[0073] Process A431: Calculate the rated attenuation from the transmitter to the second amplifier, recorded as ΔdB(1-2); the calculation formula of ΔdB(1-2) is as follows:

[0074] ΔdB(1-2)=[L(f-1)+L(1-2)]×dB(max) / L;

[0075] Process A432: Obtain the signal strength of the high frequency carrier signal transmitted to the second amplifier, denoted as nbB(1-2);

[0076] Process A433: Determine the size of nbB(1-2) and [dB(f)-ΔdB(1-2)];

[0077] If nbB(1-2) is less than [dB(f)-ΔdB(1-2)], the high frequency carrier signal is enhanced and the process A434 is entered;

[0078] If nbB(1-2) is greater than or equal to [dB(f)-ΔdB(1-2)], no processing is done;

[0079] Process A434: The signal strength after the second amplifier is amplified is recorded as ddB(1-2);

[0080] Calculate the decay coefficient of nbB(1-2) relative to [dB(f) - ΔdB(1-2)], recorded as da(1-2); the calculation formula of da(1-2) is as follows:

[0081] da(1-2)=1-{nbB(1-2) / [dB(f)-ΔdB(1-2)]};

[0082] Compare da(1-2) and add(1) to determine the calculation formula of ddB(1-2);

[0083] If da(1-2)≤add(1), then the calculation formula of ddB(1-2) is; ddB(1-2)=(1+da(1-2))×nbB(1-2);

[0084] If da(1-2)>add(1), then the calculation formula of ddB(1-2) is; ddB(1-2)=(1+add(1))×nbB(1-2);

[0085] By analogy, the processing flow of process A42 to process A43 is repeated until the high-frequency carrier signal is transmitted to the am-th amplifier.

[0086] Furthermore, the subsequent process of the process A43 is as follows:

[0087] Process A44: am-th amplifier to receiving end;

[0088] Process A441: Calculate the rated attenuation from the am-th amplifier to the receiving end, recorded as ΔdB(am-z); the calculation formula of ΔdB(am-z) is as follows:

[0089] ΔdB(am-z)=[L-L(am-z)]×dB(max) / L;

[0090] Process A442: Obtain the signal strength of the high frequency carrier signal transmitted to the second amplifier, recorded as nbB(am-z);

[0091] Process A443: Determine the size of nbB(am-z) and [dB(f)-ΔdB(am-z)];

[0092] If nbB(am-z) is less than [dB(f)-ΔdB(am-z)], the high frequency carrier signal is enhanced and the process A444 is entered;

[0093] If nbB(am-z) is greater than or equal to [dB(f)-ΔdB(am-z)], no processing is done;

[0094] Process A444: The signal strength after the second amplifier is amplified is recorded as ddB(am-z);

[0095] Calculate the decay coefficient of nbB(am-z) relative to [dB(f) - ΔdB(am-z)], recorded as da(am-z); the calculation formula of da(am-z) is as follows:

[0096] da(am-z)=1-{nbB(am-z) / [dB(f)-ΔdB(am-z)]};

[0097] Compare da(am-z) and add(1) to determine the calculation formula for ddB(am-z);

[0098] If da(am-z)≤add(1), the calculation formula of ddB(am-z) is; ddB(am-z)=(1+da(am-z))×nbB(am-z);

[0099] If da(am-z)>add(1), it means that the signal is unavailable and the receiving end does not receive the high-frequency carrier signal, prompting the sending end to resend;

[0100] The am-th amplifier sends the high-frequency carrier signal ddB(am-z) to the receiving end.

[0101] Furthermore, the specific process of process A5 is as follows:

[0102] Process A51: The high frequency carrier signal received by the receiving end is recorded as R[1], R[2] to R[sca];

[0103] Wherein, R[1] represents the first high-frequency carrier signal received by the receiving end; R[2] represents the second high-frequency carrier signal received by the receiving end; and so on, R[sca] represents the scath high-frequency carrier signal received by the receiving end; sca represents the number of subcarrier signals;

[0104] Process A52: using FFT transformation to convert the high-frequency carrier signal received by the receiving end back into a frequency domain signal;

[0105] Assume that the high-frequency carrier signal received by the receiving end is R[q], and the frequency domain signal after R[q] conversion is rR[q]; q represents the index of the frequency domain signal, and the value range of q is 1 to sca;

[0106] The mathematical expression of FFT transformation is:

[0107] Wherein, R[x] represents the x-th high-frequency carrier signal received by the receiving end, x represents the index of the high-frequency carrier signal received by the receiving end, and the value range of x is 1 to sca; j(x, q) represents the coefficient of the square root of the complex number, and the mathematical expression of j(x, q) is as follows:

[0108] Among them, j represents the imaginary unit, and π represents the circumference of a circle;

[0109] Process A53: Substitute R[1] to R[sca] into the mathematical expression of FFT transformation to obtain time domain signals rR[1], rR[2] to rR[sca];

[0110] Wherein, rR[1] represents the frequency domain signal corresponding to the first high-frequency carrier signal received by the terminal;

[0111] rR[2] represents the frequency domain signal corresponding to the second high-frequency carrier signal received by the terminal;

[0112] By analogy, rR[sca] represents the frequency domain signal corresponding to the sca-th high-frequency carrier signal received by the terminal.

[0113] Furthermore, the workflow of the analog signal communication module is as follows:

[0114] Process B1: The baseband signal is an analog signal;

[0115] Use an analog-to-digital converter to convert the baseband signal into a digital signal, recorded as digital signal A;

[0116] Turbo coding technology re-encodes digital signal A to obtain digital signal B;

[0117] Encrypting the digital signal B to obtain an encrypted signal; using the encrypted signal as the signal to be sent;

[0118] Process B2: Get the area of ​​the target region, denoted as SS;

[0119] Get the location of the transmitter, and divide the target area into four areas in the horizontal and vertical directions with the location of the transmitter as the origin. The corresponding areas of the first to fourth areas are AS, BS, CS, and DS; AS+BS+CS+DS=SS;

[0120] Process B3: Obtain the number of network nodes in the 1st to 4th areas in sequence;

[0121] The number of network nodes in the first region is denoted as An;

[0122] The number of network nodes in the second region is denoted as Bn;

[0123] The number of network nodes in the third region is denoted as Cn;

[0124] The number of network nodes in the fourth region is denoted as Dn;

[0125] Process B4: Calculate the ratio of AS:BS:CS:DS to obtain c1, c2, c3 and c4;

[0126] Calculate the ratio of An:Bn:Cn:Dn to obtain d1, d2, d3 and d4;

[0127] Process B5: The number of relay nodes allocated in the first area is recorded as al(1); the calculation formula of al(1) is as follows:

[0128]

[0129] The number of relay nodes allocated in the second area is denoted as al(2). The calculation formula of al(2) is as follows:

[0130]

[0131] The number of relay nodes allocated in the third area is denoted as al(3). The calculation formula of al(3) is as follows:

[0132]

[0133] The number of relay nodes allocated in the fourth area is denoted as al(4); the calculation formula of al(4) is as follows:

[0134]

[0135] al(1)~al(4) are all positive integers and are rounded up;

[0136] Process B6: Obtain the bandwidth and packet loss rate corresponding to all network nodes in the first area, and determine the relay node in the first area;

[0137] Process B7: Repeat the same process of determining the relay node in the first area to determine the relay nodes corresponding to the second to fourth areas;

[0138] Using an adaptive filtering algorithm and an automatic rerouting algorithm, the signal to be sent is sent from the transmitting end to the relay nodes in the 1st to 4th areas in sequence; from the corresponding relay nodes in the 1st to 4th areas, the signal to be sent is sent to the receiving ends in the 1st to 4th areas until the receiving ends in the 1st to 4th areas have received the signal to be sent.

[0139] Furthermore, the specific process of process B6 is as follows:

[0140] Process B61: Obtain the bandwidth corresponding to the first network node in the first area, denoted as ba(1); the packet loss rate is denoted as pip(1);

[0141] The bandwidth corresponding to the second network node is denoted as ba(2); the packet loss rate is denoted as pip(2);

[0142] By analogy, the bandwidth corresponding to the Anth network node is denoted as ba(An); the packet loss rate is denoted as pip(An);

[0143] Process B62: define calculation formula b to calculate the signal stability coefficient of the network node (in the first area); calculation formula b:

[0144] St(i)=ba(i)×[1-pip(i)]; where i ranges from 1 to An; St(i) represents the signal stability coefficient of the i-th network node (in the first region); ba(i) represents the bandwidth corresponding to the i-th network node; pip(i) represents the packet loss rate corresponding to the i-th network node;

[0145] Process B63: Substitute ba(1)~ba(An) and pip(1)~pip(An) into calculation formula b to calculate the signal stability coefficients St(1), St(2)~St(An) corresponding to the 1st to Anth network nodes;

[0146] Arrange the 1st to Anth network nodes in descending order of St(1), St(2) to St(An) to obtain a candidate sequence;

[0147] The first al(1) network nodes in the candidate sequence are selected as relay nodes for the first area.

[0148] Compared with the prior art, the present invention has the following beneficial effects:

[0149] High coverage and flexibility: The present invention utilizes power line carrier communication and uses power lines as the communication medium. There is no need to lay additional communication lines, so it can cover a large area of ​​power line network and achieve high coverage. The use of wireless communication further enhances the flexibility of the system. In areas where power lines cannot reach or are not suitable for electrical signals, wireless communication can be used as a supplementary means to ensure the continuity and stability of communication.

[0150] High reliability: The present invention utilizes existing power lines for communication, which can significantly reduce wiring costs and maintenance costs; wireless communication technology is used to enable the signal to have multiple anti-interference and self-healing capabilities, ensuring the stability and security of data transmission.

[0151] Improve the overall performance of the system: The dual-mode communication mechanism of the present invention can improve the efficiency and stability of data transmission. By transmitting data through power lines and wireless dual paths, it can effectively reduce delays and packet loss in data transmission and improve the performance of the entire network management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0152] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0153] Figure 1 It is a schematic diagram of the system of the present invention;

[0154] Figure 2 This is a schematic diagram of data processing of the present invention;

[0155] Figure 3This is a schematic diagram of the regional division of the present invention. DETAILED DESCRIPTION

[0156] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0157] See also Figure 1 The distributed network management system based on power line carrier and wireless dual-mode communication includes: a signal acquisition module, a digital signal communication module, an analog signal communication module, a continuous update module, a database and a server; wherein the signal acquisition module, the digital signal communication module, the analog signal communication module and the continuous update module are connected to the database and the server respectively.

[0158] Signal acquisition module: used to acquire baseband signals and determine the type of baseband signals;

[0159] If the baseband signal is a digital signal, it enters the digital signal communication module;

[0160] If the baseband signal is an analog signal, it enters the analog signal communication module;

[0161] It should be noted that the "baseband signal" in the present invention means: a signal transmitted by the present invention (distributed network management system based on power line carrier and wireless dual-mode communication);

[0162] Digital signal communication module: (baseband signal is digital signal) used to convert baseband signal into high-frequency carrier signal through orthogonal frequency division multiplexing (OFDM) modulation technology; obtain power transmission parameters of the target area; according to the power transmission parameters, adjust the signal strength of the high-frequency carrier signal from the transmitting end to the receiving end until the receiving end successfully receives the high-frequency carrier signal;

[0163] Process A: Please refer to Figure 2 ,The specific process of the digital signal communication module is as follows:

[0164] Process A1: The baseband signal is a digital signal; the baseband signal is converted into a high-frequency carrier signal using orthogonal frequency division multiplexing (OFDM) modulation technology;

[0165] Process A11: obtaining a signal bandwidth of a transmitting end as a total bandwidth; obtaining a signal bandwidth of a receiving end as a sub-bandwidth;

[0166] The total bandwidth is denoted as tob and the sub-bandwidth is denoted as sub;

[0167] The baseband signal is divided into (low-speed) data streams, each of which corresponds to a subcarrier signal; the number of subcarrier signals is denoted as sca; sca = tob / sub; sca is rounded up;

[0168] It should be noted that the "transmitting end" in the present invention refers to the signal transmitting facility of "power line carrier communication or wireless dual-mode communication"; the "receiving end" refers to the signal receiving facility of "power line carrier communication or wireless dual-mode communication";

[0169] Process A12: back up the subcarrier signal to obtain subcarrier signal A and subcarrier signal B;

[0170] PSK (Phase Shift Keying) is performed on each subcarrier signal in subcarrier signal A to obtain a modulated signal;

[0171] The modulation signals are denoted as X[1], X[2] to X[sca]; wherein X[1] represents the first modulation signal; X[2] represents the second modulation signal; and so on, X[sca] represents the scath modulation signal;

[0172] Assume that the output of IFFT transformation is fX[n], where fX[n] represents the time domain signal corresponding to the nth modulation signal; wherein n represents the index of the time domain signal, and the value range of n is 1 to sca;

[0173] Process A13: Use IFFT transform (inverse discrete Fourier transform) to convert the modulated signal into a time domain signal. The mathematical expression of IFFT transform is as follows:

[0174] Wherein, X[k] represents the kth modulation signal, k represents the index of the modulation signal, and the value range of k is 1 to sca; j(k, n) represents the coefficient of the square root of the complex number, and the mathematical expression of j(k, n) is as follows:

[0175] Where j represents the imaginary unit (i.e. j 2 =-1), π represents pi;

[0176] Substituting X[1]~X[sca] into the mathematical expression of IFFT transformation, we can obtain time domain signals fX[1], fX[2]~fX[sca]; where fX[1] represents the time domain signal corresponding to the first modulation signal; fX[2] represents the time domain signal corresponding to the second modulation signal; and so on, fX[sca] represents the time domain signal corresponding to the scath modulation signal;

[0177] Take fX[1]~fX[sca] as high-frequency signals;

[0178] Process A14: The subcarrier signals in the subcarrier signal B are recorded as S[1], S[2] to S[sca]; wherein S[1] represents the first subcarrier signal (in the subcarrier signal B); S[2] represents the second subcarrier signal (in the subcarrier signal B); and so on, S[sca] represents the sca-th subcarrier signal (in the subcarrier signal B); S[1], S[2] to S[sca]∈{0,1};

[0179] The digital signal and the high-frequency signal are modulated by a modulator to obtain a high-frequency carrier signal;

[0180] Assume that the i-th modulation signal (in the subcarrier signal B) is S[i], S[i]∈{0,1}, i represents the index of the subcarrier signal, and the value range of i is 1~sca;

[0181] Assume that the modulated high-frequency carrier signal is mm(q), where q represents the index of the high-frequency carrier signal, and the value range of q is: 1 to sca;

[0182] The modulation mathematical expression for modulating the i-th modulation signal and the n-th high-frequency signal is:

[0183] mm(q)=S[i]×fX[n], i=n; wherein n represents the index of the time domain signal;

[0184] Substituting S[1]~S[sca] and fX[1]~fX[sca] into the modulation mathematical expression, we can obtain the high-frequency carrier signals mm(1), mm(2)~mm(sca);

[0185] Among them, mm(1) represents the first high-frequency carrier signal; mm(2) represents the second high-frequency carrier signal; and so on, mm(sca) represents the scath high-frequency carrier signal;

[0186] Process A2: using a coupler to couple the high frequency carrier signal to the power line;

[0187] Get the receiving voltage at the transmitting end, denoted as vo; the receiving voltage at the receiving end, denoted as vi;

[0188] Calculate the maximum attenuation of the high-frequency carrier signal, recorded as dB(max); the calculation formula for dB(max) is as follows:

[0189] dB(max)=20×lg (vo / vi) ;

[0190] Process A3: Obtain the output sound pressure of the high-frequency carrier signal at the transmitting end, recorded as dBo;

[0191] Get the number of amplifiers (or repeaters) between the transmitter and the receiver, denoted as am;

[0192] Obtain the signal amplification factors corresponding to the 1st to am-th amplifiers (or repeaters), which are recorded as add(1), add(2) to add(am); wherein add(1) represents the signal amplification factor of the 1st amplifier (or repeater); add(2) represents the signal amplification factor of the 2nd amplifier (or repeater); and so on, add(am) represents the signal amplification factor of the am-th amplifier (or repeater);

[0193] Get the total length of the wire from the transmitter to the receiver, denoted as L;

[0194] Get the length of the wire from the transmitter to the first amplifier, recorded as L(f-1);

[0195] Get the length of the wire between the first and second amplifiers, recorded as L(1-2);

[0196] Get the length of the wire between the second and third amplifiers, recorded as L(2-3);

[0197] Similarly, the length of the wire between the am-th amplifier and the receiving end is obtained, which is recorded as L(am-z);

[0198] L(f-1)+L(1-2)+L(2-3)+……+L(am-z)=L;

[0199] Process A4: Summarize the data in processes A2 to A3 as power transmission parameters; adjust the signal strength of the high-frequency carrier signal between the wires according to the power transmission parameters until the receiving end successfully receives the high-frequency carrier signal;

[0200] Process A41: obtaining the sound pressure of the high-frequency carrier signal at the transmitting end, denoted as ii;

[0201] Get the density of the wires, denoted as ρ; calculate the rated high-frequency carrier signal strength at the receiving end, denoted as dB(z). The calculation formula for dB(z) is as follows:

[0202] dB(z)=ii 2 ×ρ×c; where c represents the speed of sound;

[0203] The high-frequency carrier signal strength at the transmitting end is expressed as dB(f). The calculation formula for dB(f) is as follows:

[0204] dB(f)=dB(z)+dB(max);

[0205] Process A42: from the transmitter to the first amplifier (or repeater);

[0206] Process A421: Calculate the rated attenuation from the transmitter to the first amplifier (or repeater), recorded as ΔdB(f-1); the calculation formula of ΔdB(f-1) is as follows:

[0207] ΔdB(f-1)=[L(f-1) / L]×dB(max);

[0208] Process A422: Obtain the signal strength of the high frequency carrier signal transmitted to the first amplifier (or repeater), denoted as nbB(f-1);

[0209] Process A423: Determine the size of nbB(f-1) and [dB(f)-ΔdB(f-1)];

[0210] If nbB(f-1) is less than [dB(f)-ΔdB(f-1)], the high frequency carrier signal is enhanced and the process A424 is entered;

[0211] If nbB(f-1) is greater than or equal to [dB(f)-ΔdB(f-1)], no processing is done;

[0212] Process A424: The signal strength after the first amplifier (or repeater) is amplified is recorded as ddB(f-1);

[0213] Calculate the decay coefficient of nbB(f-1) relative to [dB(f) - ΔdB(f-1)], recorded as da(f-1); the calculation formula of da(f-1) is as follows:

[0214] da(f-1)=1-{nbB(f-1) / [dB(f)-ΔdB(f-1)]};

[0215] Compare da(f-1) and add(1) to determine the calculation formula of ddB(f-1);

[0216] If da(f-1)≤add(1), the calculation formula of ddB(f-1) is; ddB(f-1)=(1+da(f-1))×nbB(f-1);

[0217] If da(f-1)>add(1), the calculation formula of ddB(f-1) is: ddB(f-1)=(1+add(1))×nbB(f-1);

[0218] Process A43: from the first amplifier (or repeater) to the second amplifier (or repeater);

[0219] Process A431: Calculate the rated attenuation from the transmitter to the second amplifier (or repeater), expressed as ΔdB(1-2); the calculation formula of ΔdB(1-2) is as follows:

[0220] ΔdB(1-2)=[L(f-1)+L(1-2)]×dB(max) / L;

[0221] Process A432: Obtain the signal strength of the high frequency carrier signal transmitted to the second amplifier (or repeater), recorded as nbB(1-2);

[0222] Process A433: Determine the size of nbB(1-2) and [dB(f)-ΔdB(1-2)];

[0223] If nbB(1-2) is less than [dB(f)-ΔdB(1-2)], the high frequency carrier signal is enhanced and the process A434 is entered;

[0224] If nbB(1-2) is greater than or equal to [dB(f)-ΔdB(1-2)], no processing is done;

[0225] Process A434: The signal strength after the second amplifier (or repeater) is amplified is recorded as ddB(1-2);

[0226] Calculate the decay coefficient of nbB(1-2) relative to [dB(f) - ΔdB(1-2)], recorded as da(1-2); the calculation formula of da(1-2) is as follows:

[0227] da(1-2)=1-{nbB(1-2) / [dB(f)-ΔdB(1-2)]};

[0228] Compare da(1-2) and add(1) to determine the calculation formula of ddB(1-2);

[0229] If da(1-2)≤add(1), then the calculation formula of ddB(1-2) is; ddB(1-2)=(1+da(1-2))×nbB(1-2);

[0230] If da(1-2)>add(1), then the calculation formula of ddB(1-2) is; ddB(1-2)=(1+add(1))×nbB(1-2);

[0231] By analogy, the processing flow of process A42 to process A43 is repeated until the high-frequency carrier signal is transmitted to the am-th amplifier (or repeater);

[0232] Process A44: am-th amplifier (or repeater) to the receiving end;

[0233] Process A441: Calculate the rated attenuation from the am-th amplifier (or repeater) to the receiving end, recorded as ΔdB(am-z); the calculation formula of ΔdB(am-z) is as follows:

[0234] ΔdB(am-z)=[L-L(am-z)]×dB(max) / L;

[0235] Process A442: Obtain the signal strength of the high frequency carrier signal transmitted to the second amplifier (or repeater), recorded as nbB(am-z);

[0236] Process A443: Determine the size of nbB(am-z) and [dB(f)-ΔdB(am-z)];

[0237] If nbB(am-z) is less than [dB(f)-ΔdB(am-z)], the high frequency carrier signal is enhanced and the process A444 is entered;

[0238] If nbB(am-z) is greater than or equal to [dB(f)-ΔdB(am-z)], no processing is done;

[0239] Process A444: The signal strength after the second amplifier (or repeater) is amplified is recorded as ddB (am-z);

[0240] Calculate the decay coefficient of nbB(am-z) relative to [dB(f) - ΔdB(am-z)], recorded as da(am-z); the calculation formula of da(am-z) is as follows:

[0241] da(am-z)=1-{nbB(am-z) / [dB(f)-ΔdB(am-z)]};

[0242] Compare da(am-z) and add(1) to determine the calculation formula for ddB(am-z);

[0243] If da(am-z)≤add(1), the calculation formula of ddB(am-z) is; ddB(am-z)=(1+da(am-z))×nbB(am-z);

[0244] If da(am-z)>add(1), it means that the signal is unavailable (i.e., the signal is severely distorted), the receiving end does not receive the high-frequency carrier signal, and prompts the sending end to resend (the high-frequency carrier signal);

[0245] The am-th amplifier (or repeater) sends the high-frequency carrier signal ddB (am-z) to the receiving end (i.e., the receiving end successfully receives the high-frequency carrier signal);

[0246] Process A5: Use FFT transformation to process the high-frequency carrier signal received by the receiving end to complete signal communication;

[0247] Process A51: The high frequency carrier signal received by the receiving end is recorded as R[1], R[2] to R[sca];

[0248] Wherein, R[1] represents the first high-frequency carrier signal received by the receiving end; R[2] represents the second high-frequency carrier signal received by the receiving end; and so on, R[sca] represents the sca-th high-frequency carrier signal received by the receiving end; sca represents the number of subcarrier signals (i.e., the number of high-frequency carrier signals sent by the transmitting end);

[0249] Process A52: using FFT transformation to convert the high-frequency carrier signal received by the receiving end back into a frequency domain signal;

[0250] Assume that the high-frequency carrier signal received by the receiving end is R[q], and the frequency domain signal after R[q] conversion is rR[q]; q represents the index of the frequency domain signal, and the value range of q is 1 to sca;

[0251] The mathematical expression of FFT transformation is:

[0252] Wherein, R[x] represents the x-th high-frequency carrier signal received by the receiving end, x represents the index of the high-frequency carrier signal received by the receiving end, and the value range of x is 1 to sca; j(x, q) represents the coefficient of the square root of the complex number, and the mathematical expression of j(x, q) is as follows:

[0253] Where j represents the imaginary unit (i.e. j 2 =-1), π represents pi;

[0254] Process A53: Substitute R[1] to R[sca] into the mathematical expression of FFT transformation to obtain time domain signals rR[1], rR[2] to rR[sca];

[0255] Wherein, rR[1] represents the frequency domain signal corresponding to the first high-frequency carrier signal received by the terminal;

[0256] rR[2] represents the frequency domain signal corresponding to the second high-frequency carrier signal received by the terminal;

[0257] By analogy, rR[sca] represents the frequency domain signal corresponding to the sca-th high-frequency carrier signal received by the terminal.

[0258] Analog signal communication module: (baseband signal is analog signal) is used to re-encode and encrypt the baseband signal to obtain the signal to be sent; divide the target area into 4 areas according to the (geographical) location of the sender, and allocate relay nodes to each area according to the bandwidth and packet loss rate of the network node in each area; send the signal to be sent in the order of sender-relay node-receiver until the receiver receives all the signals to be sent;

[0259] Process B: Please refer to Figure 3, the working process of the analog signal communication module is as follows:

[0260] Process B1: The baseband signal is an analog signal;

[0261] Use an analog-to-digital converter to convert the baseband signal into a digital signal, recorded as digital signal A;

[0262] Turbo coding technology re-encodes digital signal A to obtain digital signal B;

[0263] Encrypting the digital signal B to obtain an encrypted signal; using the encrypted signal as the signal to be sent;

[0264] Process B2: Get the area of ​​the target region, denoted as SS;

[0265] Get the location of the transmitter, and divide the target area into four areas in the horizontal and vertical directions with the location of the transmitter as the origin. The corresponding areas of the first to fourth areas are AS, BS, CS, and DS; AS+BS+CS+DS=SS;

[0266] Process B3: Obtain the number of network nodes (i.e., the number of network base stations and network servers) in the first to fourth regions in sequence;

[0267] The number of network nodes in the first region is denoted as An;

[0268] The number of network nodes in the second region is denoted as Bn;

[0269] The number of network nodes in the third region is denoted as Cn;

[0270] The number of network nodes in the fourth region is denoted as Dn;

[0271] Process B4: Calculate the ratio of AS:BS:CS:DS to obtain c1, c2, c3 and c4; (i.e., AS:BS:CS:DS=c1:c2:c3:c4)

[0272] Calculate the ratio of An:Bn:Cn:Dn to obtain d1, d2, d3 and d4; (i.e. An:Bn:Cn:Dn = d1:d2:d3:d4)

[0273] Process B5: The number of relay nodes allocated in the first area is recorded as al(1); the calculation formula of al(1) is as follows:

[0274]

[0275] The number of relay nodes allocated in the second area is denoted as al(2). The calculation formula of al(2) is as follows:

[0276]

[0277] The number of relay nodes allocated in the third area is denoted as al(3). The calculation formula of al(3) is as follows:

[0278]

[0279] The number of relay nodes allocated in the fourth area is denoted as al(4); the calculation formula of al(4) is as follows:

[0280]

[0281] al(1)~al(4) are all positive integers and are rounded up;

[0282] Process B6: Obtain the bandwidth and packet loss rate corresponding to all network nodes in the first area, and determine the relay node in the first area;

[0283] Process B61: Obtain the bandwidth corresponding to the first network node in the first area, denoted as ba(1); the packet loss rate is denoted as pip(1);

[0284] The bandwidth corresponding to the second network node is denoted as ba(2); the packet loss rate is denoted as pip(2);

[0285] By analogy, the bandwidth corresponding to the Anth network node is denoted as ba(An); the packet loss rate is denoted as pip(An);

[0286] Process B62: define calculation formula b to calculate the signal stability coefficient of the network node (in the first area); calculation formula b:

[0287] St(i)=ba(i)×[1-pip(i)]; where i ranges from 1 to An; St(i) represents the signal stability coefficient of the i-th network node (in the first region); ba(i) represents the bandwidth corresponding to the i-th network node (in the first region); pip(i) represents the packet loss rate corresponding to the i-th network node (in the first region);

[0288] Process B63: Substitute ba(1)~ba(An) and pip(1)~pip(An) into calculation formula b to calculate the signal stability coefficients St(1), St(2)~St(An) corresponding to the 1st to Anth network nodes (in the 1st area);

[0289] Arrange the 1st to Anth network nodes (in the 1st region) in descending order of St(1), St(2) to St(An) to obtain a candidate sequence;

[0290] Select the first al(1) network nodes in the candidate sequence as relay nodes for the first region;

[0291] Process B7: Repeat the same process of determining the relay node in the first area (i.e., process B6) to determine the relay nodes corresponding to the second to fourth areas;

[0292] Using an adaptive filtering algorithm and an automatic rerouting algorithm, the signal to be sent is sent from the transmitting end to the relay nodes in the 1st to 4th areas in sequence; from the corresponding relay nodes in the 1st to 4th areas, the signal to be sent is sent to the receiving ends in the 1st to 4th areas until the receiving ends in the 1st to 4th areas have received the signal to be sent.

[0293] Continuous update module: used to continuously acquire baseband signals and synchronously update baseband signals.

[0294] The above formulas are all dimensionless and numerical calculations. The formula is a formula for the most recent real situation obtained by collecting a large amount of data and performing software simulation. The preset parameters in the formula are set by technical personnel in this field according to actual conditions. For example, if there are weight coefficients and proportional coefficients, their set sizes are to quantify each parameter to obtain a specific value, which is convenient for subsequent comparison. Regarding the size of the weight coefficient and the proportional coefficient, it is sufficient as long as it does not affect the proportional relationship between the parameter and the quantized value.

[0295] Finally, it should be noted that the above-described embodiments are only specific implementations of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed by the present invention, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A distributed network management system based on power line carrier and wireless dual-mode communication, characterized in that: The system comprises: Signal acquisition module: used to acquire baseband signals and determine the type of baseband signals; If the baseband signal is a digital signal, it enters the digital signal communication module; If the baseband signal is an analog signal, it enters the analog signal communication module; Digital signal communication module: used to convert the baseband signal into a high-frequency carrier signal through orthogonal frequency division multiplexing modulation technology; obtain the power transmission parameters of the target area; according to the power transmission parameters, adjust the signal strength of the high-frequency carrier signal from the transmitting end to the receiving end until the receiving end successfully receives the high-frequency carrier signal; Analog signal communication module: used to re-encode and encrypt the baseband signal to obtain the signal to be sent; regionalize the target area according to the location of the sending end, and allocate relay nodes to each area according to the bandwidth and packet loss rate of the network node in each area; send the signal to be sent in the order of sending end-relay node-receiving end until the receiving end receives all the signals to be sent; Continuous update module: used to continuously acquire baseband signals and synchronously update baseband signals.

2. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 1 is characterized in that: The specific process of the digital signal communication module is as follows: Process A1: The baseband signal is a digital signal; orthogonal frequency division multiplexing modulation technology is used to convert the baseband signal into a high-frequency carrier signal; Process A2: using a coupler to couple the high frequency carrier signal to the power line; Get the receiving voltage at the transmitting end, denoted as vo; the receiving voltage at the receiving end, denoted as vi; Calculate the maximum attenuation of the high-frequency carrier signal, recorded as dB(max); the calculation formula for dB(max) is as follows: dB(max)=20×lg (vo / vi) ; Process A3: Obtain the output sound pressure of the high-frequency carrier signal at the transmitting end, recorded as dBo; Get the number of amplifiers between the transmitter and the receiver, denoted as am; Obtain the signal amplification factors corresponding to the 1st to am-th amplifiers, which are recorded as add(1), add(2) to add(am); wherein add(1) represents the signal amplification factor of the 1st amplifier; add(2) represents the signal amplification factor of the 2nd amplifier; and so on, add(am) represents the signal amplification factor of the am-th amplifier; Get the total length of the wire from the transmitter to the receiver, denoted as L; Get the length of the wire from the transmitter to the first amplifier, recorded as L(f-1); Get the length of the wire between the first and second amplifiers, recorded as L(1-2); Get the length of the wire between the second and third amplifiers, recorded as L(2-3); Similarly, obtain the length of the wire from the am-th amplifier to the receiving end, recorded as L(am-z); L(f-1)+L(1-2)+L(2-3)+……+L(am-z)=L; Process A4: Summarize the data in processes A2 to A3 as power transmission parameters; adjust the signal strength of the high-frequency carrier signal between the wires according to the power transmission parameters until the receiving end successfully receives the high-frequency carrier signal; Process A5: Use FFT transformation to process the high-frequency carrier signal received by the receiving end to complete signal communication.

3. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 2 is characterized in that: The specific process of process A1 is as follows: Process A11: obtaining a signal bandwidth of a transmitting end as a total bandwidth; obtaining a signal bandwidth of a receiving end as a sub-bandwidth; The total bandwidth is denoted as tob and the sub-bandwidth is denoted as sub; The baseband signal is divided into data streams, each data stream corresponds to a subcarrier signal; the number of subcarrier signals is denoted as sca; sca = tob / sub; sca is rounded up; Process A12: back up the subcarrier signal to obtain subcarrier signal A and subcarrier signal B; Perform PSK modulation on each subcarrier signal in subcarrier signal A to obtain a modulated signal; The modulation signals are denoted as X[1], X[2] to X[sca]; wherein X[1] represents the first modulation signal; X[2] represents the second modulation signal; and so on, X[sca] represents the scath modulation signal; Assume that the output of IFFT transformation is fX[n], where fX[n] represents the time domain signal corresponding to the nth modulation signal; wherein n represents the index of the time domain signal, and the value range of n is 1 to sca; Process A13: Use IFFT transform to convert the modulated signal into a time domain signal. The mathematical expression of IFFT transform is as follows: Wherein, X[k] represents the kth modulation signal, k represents the index of the modulation signal, and the value range of k is 1 to sca; j(k, n) represents the coefficient of the square root of the complex number, and the mathematical expression of j(k, n) is as follows: Among them, j represents the imaginary unit, and π represents the circumference of a circle; Substituting X[1]~X[sca] into the mathematical expression of IFFT transformation, we can obtain time domain signals fX[1], fX[2]~fX[sca]; where fX[1] represents the time domain signal corresponding to the first modulation signal; fX[2] represents the time domain signal corresponding to the second modulation signal; and so on, fX[sca] represents the time domain signal corresponding to the scath modulation signal; Let fX[1]~fX[sca] be high-frequency signals.

4. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 3 is characterized in that: The subsequent process of the process A13 is as follows: Process A14: The subcarrier signals in the subcarrier signal B are recorded as S[1], S[2] to S[sca]; wherein S[1] represents the first subcarrier signal; S[2] represents the second subcarrier signal; and so on, S[sca] represents the sca-th subcarrier signal; S[1], S[2] to S[sca]∈{0,1}; The digital signal and the high-frequency signal are modulated by a modulator to obtain a high-frequency carrier signal; Assume that the i-th modulation signal is S[i], S[i]∈{0,1}, i represents the index of the subcarrier signal, and the value range of i is 1~sca; Assume that the modulated high-frequency carrier signal is mm(q), where q represents the index of the high-frequency carrier signal, and the value range of q is: 1 to sca; The modulation mathematical expression for modulating the i-th modulation signal and the n-th high-frequency signal is: mm(q)=S[i]×fX[n], i=n; wherein n represents the index of the time domain signal; Substituting S[1]~S[sca] and fX[1]~fX[sca] into the modulation mathematical expression, we can obtain the high-frequency carrier signals mm(1), mm(2)~mm(sca); Among them, mm(1) represents the first high-frequency carrier signal; mm(2) represents the second high-frequency carrier signal; and so on, mm(sca) represents the scath high-frequency carrier signal.

5. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 2 is characterized in that: The specific process of process A4 is as follows: Process A41: obtaining the sound pressure of the high-frequency carrier signal at the transmitting end, denoted as ii; Get the density of the wires, denoted as ρ; calculate the rated high-frequency carrier signal strength at the receiving end, denoted as dB(z). The calculation formula for dB(z) is as follows: dB(z)=ii 2 ×ρ×c; where c represents the speed of sound; The high-frequency carrier signal strength at the transmitting end is expressed as dB(f). The calculation formula for dB(f) is as follows: dB(f)=dB(z)+dB(max); Process A42: from the sending end to the first amplifier; Process A421: Calculate the rated attenuation from the transmitter to the first amplifier, recorded as ΔdB(f-1); the calculation formula of ΔdB(f-1) is as follows: ΔdB(f-1)=[L(f-1) / L]×dB(max); Process A422: Obtain the signal strength of the high frequency carrier signal transmitted to the first amplifier, denoted as nbB(f-1); Process A423: Determine the size of nbB(f-1) and [dB(f)-ΔdB(f-1)]; If nbB(f-1) is less than [dB(f)-ΔdB(f-1)], the high frequency carrier signal is enhanced and the process A424 is entered; If nbB(f-1) is greater than or equal to [dB(f)-ΔdB(f-1)], no processing is done; Process A424: The signal strength after the first amplifier is amplified is recorded as ddB(f-1); Calculate the decay coefficient of nbB(f-1) relative to [dB(f) - ΔdB(f-1)], recorded as da(f-1); the calculation formula of da(f-1) is as follows: da(f-1)=1-{nbB(f-1) / [dB(f)-ΔdB(f-1)]}; Compare da(f-1) and add(1) to determine the calculation formula of ddB(f-1); If da(f-1)≤add(1), the calculation formula of ddB(f-1) is; ddB(f-1)=(1+da(f-1))×nbB(f-1); If da(f-1)>add(1), the calculation formula of ddB(f-1) is: ddB(f-1)=(1+add(1))×nbB(f-1); Process A43: 1st amplifier to 2nd amplifier; Process A431: Calculate the rated attenuation from the transmitter to the second amplifier, recorded as ΔdB(1-2); the calculation formula of ΔdB(1-2) is as follows: ΔdB(1-2)=[L(f-1)+L(1-2)]×dB(max) / L; Process A432: Obtain the signal strength of the high frequency carrier signal transmitted to the second amplifier, denoted as nbB(1-2); Process A433: Determine the size of nbB(1-2) and [dB(f)-ΔdB(1-2)]; If nbB(1-2) is less than [dB(f)-ΔdB(1-2)], the high frequency carrier signal is enhanced and the process A434 is entered; If nbB(1-2) is greater than or equal to [dB(f)-ΔdB(1-2)], no processing is done; Process A434: The signal strength after the second amplifier is amplified is recorded as ddB(1-2); Calculate the decay coefficient of nbB(1-2) relative to [dB(f) - ΔdB(1-2)], recorded as da(1-2); the calculation formula of da(1-2) is as follows: da(1-2)=1-{nbB(1-2) / [dB(f)-ΔdB(1-2)]}; Compare da(1-2) and add(1) to determine the calculation formula of ddB(1-2); If da(1-2)≤add(1), then the calculation formula of ddB(1-2) is; ddB(1-2)=(1+da(1-2))×nbB(1-2); If da(1-2)>add(1), then the calculation formula of ddB(1-2) is; ddB(1-2)=(1+add(1))×nbB(1-2); By analogy, the processing steps of process A42 to process A43 are repeated until the high-frequency carrier signal is transmitted to the am-th amplifier.

6. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 5 is characterized in that: The subsequent process of the process A43 is as follows: Process A44: am-th amplifier to receiving end; Process A441: Calculate the rated attenuation from the am-th amplifier to the receiving end, recorded as ΔdB(am-z); the calculation formula of ΔdB(am-z) is as follows: ΔdB(am-z)=[L-L(am-z)]×dB(max) / L; Process A442: Obtain the signal strength of the high frequency carrier signal transmitted to the second amplifier, recorded as nbB(am-z); Process A443: Determine the size of nbB(am-z) and [dB(f)-ΔdB(am-z)]; If nbB(am-z) is less than [dB(f)-ΔdB(am-z)], the high frequency carrier signal is enhanced and the process A444 is entered; If nbB(am-z) is greater than or equal to [dB(f)-ΔdB(am-z)], no processing is done; Process A444: The signal strength after the second amplifier is amplified is recorded as ddB(am-z); Calculate the decay coefficient of nbB(am-z) relative to [dB(f) - ΔdB(am-z)], recorded as da(am-z); the calculation formula of da(am-z) is as follows: da(am-z)=1-{nbB(am-z) / [dB(f)-ΔdB(am-z)]}; Compare da(am-z) and add(1) to determine the calculation formula for ddB(am-z); If da(am-z)≤add(1), the calculation formula of ddB(am-z) is; ddB(am-z)=(1+da(am-z))×nbB(am-z); If da(am-z)>add(1), it means that the signal is unavailable and the receiving end does not receive the high-frequency carrier signal, prompting the sending end to resend; The am-th amplifier sends the high-frequency carrier signal ddB(am-z) to the receiving end.

7. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 2 is characterized in that: The specific process of process A5 is as follows: Process A51: The high frequency carrier signal received by the receiving end is recorded as R[1], R[2] to R[sca]; Wherein, R[1] represents the first high-frequency carrier signal received by the receiving end; R[2] represents the second high-frequency carrier signal received by the receiving end; and so on, R[sca] represents the scath high-frequency carrier signal received by the receiving end; sca represents the number of subcarrier signals; Process A52: using FFT transformation to convert the high-frequency carrier signal received by the receiving end back into a frequency domain signal; Assume that the high-frequency carrier signal received by the receiving end is R[q], and the frequency domain signal after R[q] conversion is rR[q]; q represents the index of the frequency domain signal, and the value range of q is 1 to sca; The mathematical expression of FFT transformation is: Wherein, R[x] represents the x-th high-frequency carrier signal received by the receiving end, x represents the index of the high-frequency carrier signal received by the receiving end, and the value range of x is 1 to sca; j(x, q) represents the coefficient of the square root of the complex number, and the mathematical expression of j(x, q) is as follows: Among them, j represents the imaginary unit, and π represents the circumference of a circle; Process A53: Substitute R[1] to R[sca] into the mathematical expression of FFT transformation to obtain time domain signals rR[1], rR[2] to rR[sca]; Wherein, rR[1] represents the frequency domain signal corresponding to the first high-frequency carrier signal received by the terminal; rR[2] represents the frequency domain signal corresponding to the second high-frequency carrier signal received by the terminal; By analogy, rR[sca] represents the frequency domain signal corresponding to the sca-th high-frequency carrier signal received by the terminal.

8. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 1 is characterized in that: The working process of the analog signal communication module is as follows: Process B1: The baseband signal is an analog signal; Use an analog-to-digital converter to convert the baseband signal into a digital signal, recorded as digital signal A; Turbo coding technology re-encodes digital signal A to obtain digital signal B; Encrypting the digital signal B to obtain an encrypted signal; using the encrypted signal as the signal to be sent; Process B2: Get the area of ​​the target region, denoted as SS; Get the location of the transmitter, and divide the target area into four areas in the horizontal and vertical directions with the location of the transmitter as the origin. The corresponding areas of the first to fourth areas are AS, BS, CS, and DS; AS+BS+CS+DS=SS; Process B3: Obtain the number of network nodes in the 1st to 4th areas in sequence; The number of network nodes in the first region is denoted as An; The number of network nodes in the second region is denoted as Bn; The number of network nodes in the third region is denoted as Cn; The number of network nodes in the fourth region is denoted as Dn; Process B4: Calculate the ratio of AS:BS:CS:DS to obtain c1, c2, c3 and c4; Calculate the ratio of An:Bn:Cn:Dn to obtain d1, d2, d3 and d4; Process B5: The number of relay nodes allocated in the first area is recorded as al(1); the calculation formula of al(1) is as follows: The number of relay nodes allocated in the second area is denoted as al(2). The calculation formula of al(2) is as follows: The number of relay nodes allocated in the third area is denoted as al(3). The calculation formula of al(3) is as follows: The number of relay nodes allocated in the fourth area is denoted as al(4); the calculation formula of al(4) is as follows: al(1)~al(4) are all positive integers and are rounded up; Process B6: Obtain the bandwidth and packet loss rate corresponding to all network nodes in the first area, and determine the relay node in the first area; Process B7: Repeat the same process of determining the relay node in the first area to determine the relay nodes corresponding to the second to fourth areas; Using an adaptive filtering algorithm and an automatic rerouting algorithm, the signal to be sent is sent from the transmitting end to the relay nodes in the 1st to 4th areas in sequence; from the corresponding relay nodes in the 1st to 4th areas, the signal to be sent is sent to the receiving ends in the 1st to 4th areas until the receiving ends in the 1st to 4th areas have received the signal to be sent.

9. The distributed network management system based on power line carrier and wireless dual-mode communication according to claim 8, characterized in that: The specific process of process B6 is as follows: Process B61: Obtain the bandwidth corresponding to the first network node in the first area, denoted as ba(1); the packet loss rate is denoted as pip(1); The bandwidth corresponding to the second network node is denoted as ba(2); the packet loss rate is denoted as pip(2); By analogy, the bandwidth corresponding to the Anth network node is denoted as ba(An); the packet loss rate is denoted as pip(An); Process B62: define calculation formula b to calculate the signal stability coefficient of the network node; Calculation formula b: St(i)=ba(i)×[1-pip(i)]; where i ranges from 1 to An; St(i) represents the signal stability coefficient of the i-th network node; ba(i) represents the bandwidth corresponding to the i-th network node; pip(i) represents the packet loss rate corresponding to the i-th network node; Process B63: Substitute ba(1)~ba(An) and pip(1)~pip(An) into calculation formula b to calculate the signal stability coefficients St(1), St(2)~St(An) corresponding to the 1st to Anth network nodes; Arrange the 1st to Anth network nodes in descending order of St(1), St(2) to St(An) to obtain a candidate sequence; The first al(1) network nodes in the candidate sequence are selected as relay nodes for the first area.

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