CN119766616A - Weak current communication method and weak current communication system - Google Patents
Weak current communication method and weak current communication system Download PDFInfo
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Abstract
The application discloses a weak current communication method and a weak current communication system, and belongs to the technical field of weak current communication. The weak current communication method comprises the steps of performing anti-interference modulation on signals to obtain modulated signals, performing regeneration processing on the modulated signals to reconstruct the original form and strength of the signals, performing anti-interference demodulation on the regenerated signals, and sending the anti-interference demodulated signals to receiving terminal equipment. The application can solve the signal interference problem in the weak current communication process, and improve the transmission performance of signals in the interference environment, thereby obviously improving the signal quality and the communication reliability.
Description
Technical Field
The application relates to the technical field of weak current communication, in particular to a weak current communication method and a weak current communication system.
Background
In weak current communication systems, signals are often affected by various interference factors, such as electromagnetic interference, signal attenuation, etc., which may result in degradation of signal quality and degradation of communication reliability. At present, although some anti-interference methods are adopted, the effects of the methods in complex interference environments are limited, and the interference problem in the signal transmission process cannot be effectively solved.
Disclosure of Invention
The application aims to overcome the defects of the prior art, and provides a weak current communication method and a weak current communication system, which can improve the transmission performance of signals in an interference environment, thereby remarkably improving the signal quality and the communication reliability.
In a first aspect, the present application provides a weak current communication method, including:
anti-interference modulation is carried out on the signal to obtain a modulated signal;
performing regeneration processing on the modulated signal to reconstruct the original form and intensity of the signal;
Performing anti-interference demodulation on the regenerated signal;
and transmitting the anti-interference demodulated signal to receiving end equipment.
Optionally, the performing a regeneration process on the modulated signal includes:
Amplifying the modulated signal;
And shaping the modulated signal after signal amplification.
Optionally, an anti-interference modulation mode or a quadrature amplitude modulation mode is adopted to perform anti-interference modulation on the signal so as to obtain the modulated signal.
Optionally, a coherent demodulation method or a noncoherent demodulation method is adopted to conduct anti-interference demodulation on the regenerated signal.
Optionally, before performing anti-interference demodulation on the signal after the regeneration processing, the method further comprises the step of preprocessing the signal after the regeneration processing, wherein the preprocessing comprises the following steps:
removing a direct current component in the regenerated signal;
signal alignment is carried out on the signals from which the direct current components are removed;
and carrying out timing recovery on the signals after signal alignment.
Optionally, before the anti-interference demodulated signal is sent to the receiving end device, the method further includes:
Detecting the anti-interference demodulated signal;
and carrying out post-processing on the detected signal, wherein the post-processing comprises error coding correction and de-interleaving.
Optionally, before the anti-interference demodulated signal is sent to the receiving end device, the method further includes:
performing format conversion on the anti-interference demodulated signal;
and carrying out clock synchronization on the signals after format conversion.
Optionally, before performing the anti-interference modulation on the signal, the method further includes:
collecting state information of a channel;
dynamically adjusting a frequency allocation policy based on the status information;
and adjusting the transmitting frequency of the signal based on the frequency allocation strategy.
In a second aspect, the present application also provides a weak current communication system, the weak current communication system comprising:
the modulation module is used for carrying out anti-interference modulation on the signals so as to obtain modulated signals;
The regeneration processing module is used for carrying out regeneration processing on the modulated signal so as to reconstruct the original form and intensity of the signal;
The anti-interference demodulation module is used for carrying out anti-interference demodulation on the regenerated signals;
and the receiving terminal equipment is used for receiving the anti-interference demodulated signal.
Optionally, the weak current communication system further comprises:
the frequency allocation module is used for dynamically adjusting a frequency allocation strategy based on the state information of the channel;
and the transmitting end equipment is used for adjusting the transmitting frequency of the signal based on the frequency allocation strategy.
The weak current communication method and the weak current communication system have the advantages that the signals are subjected to anti-interference modulation to obtain modulated signals, the modulated signals are subjected to regeneration processing to reconstruct the original form and strength of the signals, the signals subjected to the regeneration processing are subjected to anti-interference demodulation, and the signals subjected to the anti-interference demodulation are sent to receiving end equipment. The application can solve the signal interference problem in the weak current communication process, and improve the transmission performance of signals in the interference environment, thereby obviously improving the signal quality and the communication reliability.
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and other drawings may be obtained according to the drawings without inventive effort to those of ordinary skill in the art.
Fig. 1 is a flowchart of a weak current communication method according to an embodiment of the present application.
Fig. 2 is a block diagram illustrating a weak current communication system according to another embodiment of the present application.
Detailed Description
In order to make the purpose and technical solutions of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present application. It will be apparent that the described embodiments are some, but not all, embodiments of the application. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present application fall within the protection scope of the present application.
In one embodiment, referring to FIG. 1, the present application provides a weak current communication method, which may include steps S101-S104.
And step S101, performing anti-interference modulation on the signal to obtain a modulated signal.
And step S102, carrying out regeneration processing on the modulated signal to reconstruct the original form and intensity of the signal.
And step S103, performing anti-interference demodulation on the regenerated signal.
Step S104, the anti-interference demodulated signal is sent to receiving terminal equipment.
The weak current communication method comprises the steps of performing anti-interference modulation on a signal to obtain a modulated signal, performing regeneration processing on the modulated signal to reconstruct the original form and strength of the signal, performing anti-interference demodulation on the regenerated signal, and transmitting the anti-interference demodulated signal to receiving end equipment. The application can solve the signal interference problem in the weak current communication process, and improve the transmission performance of signals in the interference environment, thereby obviously improving the signal quality and the communication reliability.
In step S101, please refer to step S101 in fig. 1, anti-interference modulation is performed on the signal to obtain a modulated signal.
As an example, the signal may be an original signal, such as a baseband signal. The anti-interference capability of the signal in a complex electromagnetic environment can be remarkably improved by carrying out anti-interference modulation on the signal.
As an example, in the step S101, an optimal anti-interference modulation technique is selected according to the characteristics of the signal and the interference environment, the signal is modulated, and the information signal is converted into parameters, such as frequency, amplitude or phase, of one or more carrier signals. The selected modulation technology can adapt to different interference environments, and the robustness of the signal in the transmission process is ensured.
As an example, the signal is subjected to anti-interference modulation by using the orthogonal frequency division multiplexing modulation mode or the orthogonal amplitude modulation mode, so as to obtain the modulated signal.
As an example, for environments of multipath interference, the orthogonal frequency division multiplexing modulation may be employed. The orthogonal frequency division multiplexing is a multi-carrier modulation technique that breaks up a high-speed data stream into multiple low-speed sub-streams, each of which is independently modulated on a respective sub-carrier. These sub-carriers are orthogonal, meaning that they are separated in frequency, which makes efficient use of spectrum resources and reduces interference between the sub-carriers.
The orthogonal frequency division multiplexing modulation is widely used in wireless communication systems such as Wi-Fi, 4G/5G mobile communication, etc., particularly in channels with large multipath delays, because it can combat multipath effects by adding a cyclic prefix.
Based on this, the OFDM modulation is generally used in cases where the OFDM modulation can effectively resist multipath propagation and frequency selective fading when the channel has such fading, in applications where high data rates and spectral efficiency are required, application scenarios including 4G/5G mobile communications, wi-Fi, digital television broadcasting, and the like.
In another example, the quadrature amplitude modulation may be employed. The quadrature amplitude modulation is a multiplexing method of amplitude modulation on two orthogonal carriers, which allows transmission of a plurality of bits of information on each carrier. The quadrature amplitude modulation can provide a higher data transmission rate than the conventional modulation method by varying the amplitude and phase of the carrier wave to represent data. Common applications of the quadrature amplitude modulation include cable television, satellite communications, and digital communications systems.
Based on this, the quadrature amplitude modulation is typically used when the data transmission rate needs to be increased while the demand for bandwidth is kept relatively low, in case the channel quality is good and a certain error rate can be tolerated, because the quadrature amplitude modulation is more sensitive to channel noise and interference at higher order modulation, application scenarios include cable and wireless communication systems like cable tv, satellite communication, xDSL.
Specifically, the modulation procedure using the quadrature amplitude modulation as the antijam modulation technique is as follows:
Wherein, Is the signal after the modulation and is then processed,AndRespectively the firstThe real and imaginary parts of the individual symbols,Is the firstThe frequency of the sub-carriers is such that,Is the total number of sub-carriers and,It is the time that is required for the device to be in contact with the substrate,Is the circumference ratio.
In step S102, please refer to step S102 in fig. 1, the regeneration process is performed on the modulated signal to reconstruct the original shape and intensity of the signal.
As an example, the step S102 of performing the regeneration processing on the modulated signal may include steps S1021 to S1022.
And S1021, amplifying the modulated signal.
And S1022, shaping the modulated signal after signal amplification.
As an example, in step S1021, a low noise amplifier may be used to primarily amplify the weak received signal (i.e., the modulated signal modulated in step S101), so as to increase the energy level of the modulated signal, while maintaining the quality of the signal, thereby reducing the noise impact in subsequent processing.
As an example, in step S1022, a shaping unit including a limiter and a filter may be used to shape the modulated signal after signal amplification, specifically, the amplitude of the modulated signal after signal amplification is limited by the limiter, so as to prevent distortion caused by an excessive signal peak value, and then unnecessary frequency components are removed by the filter, so that stability and definition of the signal are ensured, so that subsequent interference demodulation is facilitated.
By way of example, a high quality, stable signal can be obtained after the regeneration process.
As an example, after step S102, the method further includes a step of preprocessing the signal after the regeneration processing, where the preprocessing includes removing a direct current component in the signal after the regeneration processing, performing signal alignment on the signal from which the direct current component is removed, and performing timing recovery on the signal after the signal alignment. Through the preprocessing, the synchronization between the preprocessed signal and the subsequent interference demodulation can be ensured. In step S103, please refer to step S103 in fig. 1, anti-interference demodulation is performed on the signal after the regeneration processing.
As an example, a coherent demodulation method or a noncoherent demodulation method may be used to perform anti-interference demodulation on the signal after the regeneration processing, and in particular, the anti-interference demodulation method may correspond to the anti-interference modulation.
By way of example, the quadrature amplitude modulation is used for modulation, and the demodulator in this step can extract from the received signal by performing a corresponding mathematical operation according to the known modulation scheme and performing a reverse-push according to the result of the last formula in step S101AndTo recover the original information.
As an example, demodulation is performed using the coherent demodulation, and a local oscillation signal of the same frequency and phase as the signal after the reproduction processing is used to mix with the signal after the reproduction processing to extract information. The formula is used as follows:
,
Wherein, Is the signal after the mixing and is a signal after the mixing,Is the received signal after the regeneration process, cIs a locally oscillating signal.
As an example, after step S103, the method may further include detecting the anti-interference demodulated signal, and performing post-processing on the detected signal, where the post-processing includes error coding correction and de-interleaving.
Specifically, after mixing, the baseband signal is obtained by a low pass filter, and then the transmitted symbol is estimated using a signal detection algorithm, such as maximum likelihood detection or minimum mean square error detection.
By way of example, by performing post-processing such as error coding correction and deinterleaving on the detected signal, the accuracy of the signal obtained by interference decoding can be further improved.
In step S104, please refer to step S104 in fig. 1, the interference-free demodulated signal is sent to a receiving device.
As an example, before the anti-interference demodulated signal is sent to the receiving end device in step S104, the method may further include the steps of performing format conversion on the anti-interference demodulated signal, and performing clock synchronization on the format-converted signal.
By way of example, the receiving device is a Digital Signal Processor (DSP) and the demodulation module converts the analog signal to a digital signal via an analog-to-digital converter (ADC). This process is expressed as:
Wherein, As a result of the digital signal,Is an analog signal.
As an example, the converted digital signal is synchronized with an internal clock of the digital signal processor, avoiding signal distortion due to clock skew.
As an example, a successful signal is sent to the receiving end device, indicating the completion of the entire signal transmission process.
In another embodiment of the present application, before the anti-interference modulation is performed on the signal, i.e. before step S101, the method may further comprise the steps of collecting state information of a channel, dynamically adjusting a frequency allocation strategy based on the state information, and adjusting a transmission frequency of the signal based on the frequency allocation strategy.
By way of example, selecting the frequency allocation policy may include unoccupied frequency resources that may be marked as unoccupied if certain frequencies are monitored to have no signal activity for a particular time, and minimally interfering frequency resources that may identify less interfering frequency bins by analyzing the noise frequency distribution.
Specifically, the following are some possible allocation policies:
Frequency avoidance the allocation strategy may avoid using frequencies at or near a certain frequency if the source of the interference is known.
Minimum interference principle-those frequencies with the smallest interference level are selected for allocation.
Frequency multiplexing, namely multiplexing frequencies in time and space, and dynamically allocating the frequency resources by utilizing the time variation characteristic of channels.
Specifically, there are analysis results of frequency A, which is weak in signal strength and low in noise level, frequency B, which is medium in signal strength and high in noise level, and frequency C, which is non-strong in signal strength and low in noise level (unoccupied). The dynamic allocation strategy would be to prioritize the frequency C because it is unoccupied and the noise level is low, to select the frequency a because its noise level is low despite the presence of a signal if the frequency C is not available, and to select the frequency B because it has a higher noise level.
As an example, a plurality of the signals in the channel need to be transmitted, and different frequency resources are allocated according to the characteristics of each of the signals. For example, the adjustment frequency is specifically adjusted to perform transmission to the selected frequency channel using the following formula:
Wherein: is the frequency assigned to the signal; Is the starting frequency; Is the signal sequence number; Is the frequency interval.
As an example, the transmitting end device for transmitting the signal may adjust the transmission frequency of the signal according to the above-mentioned allocation result, so as to ensure that the signal has the best performance on the transmission path.
In another embodiment of the present application, referring to fig. 2, the present application further provides a weak current communication system, where the weak current communication system includes a modulation module 201, a regeneration processing module 202, an anti-interference demodulation module 203, and a receiving device 204. The modulating module 201 is configured to perform anti-interference modulation on a signal to obtain a modulated signal, the regeneration processing module 202 is configured to perform regeneration processing on the modulated signal to reconstruct an original shape and strength of the signal, the anti-interference demodulation module 203 is configured to perform anti-interference demodulation on the regenerated signal, and the receiving end device 204 is configured to receive the signal after the anti-interference demodulation.
As an example, the weak current communication system may be used to perform the steps as described in fig. 1 and above regarding the weak current communication method, and specific limitations regarding the weak current communication system may be referred to the limitations regarding the weak current communication method above, which are not repeated herein. The various modules in the weak current communication system described above may be implemented in whole or in part by software, hardware, and combinations thereof. The above modules may be embedded in hardware or may be independent of a processor in the computer device, or may be stored in software in a memory in the computer device, so that the processor may call and execute operations corresponding to the above modules.
In one example, the modulation module 201 selects the optimal anti-interference modulation technique based on the characteristics of the signal and the interference environment, modulates the signal, and converts the information signal into one or more parameters of the carrier signal, such as frequency, amplitude, or phase. The modulation module 201 converts the received signal into a format suitable for transmission. The regeneration processing module 202 may include a low noise amplifier (not shown), a limiter, and a filter, where after the regeneration processing module 202 captures the modulated signal, the low noise amplifier primarily amplifies the weak received signal (i.e., the modulated signal after interference modulation), the amplitude of the amplified signal is limited by the limiter, and then unnecessary frequency components are removed by the filter, so as to output the high-quality and stable regenerated signal. The anti-interference demodulation module 203 performs preprocessing including removing a direct current component, aligning signals and recovering timing, so that the preprocessed signals are synchronized with the anti-interference demodulation module 203, and corresponding anti-interference demodulation technologies are selected according to the anti-interference modulation technology of the signals. And finally, performing detection and post-processing, including estimating the original transmitted symbols, error correction, de-interleaving and the like, and recovering to obtain the original information. The receiving end device 204 receives the anti-interference demodulated signal, performs format conversion, synchronization and clock synchronization on the anti-interference demodulated signal, and outputs the signal to the receiving end device through a proper interface to complete signal transmission.
In another example, referring to fig. 2, the weak current communication system may further include a frequency allocator 205 and a transmitting end device 206, where the frequency allocation module 205 is configured to dynamically adjust a frequency allocation policy based on state information of a channel, and the transmitting end device 206 is configured to adjust a transmission frequency of a signal based on the frequency allocation policy.
Specifically, the frequency allocation module 205 monitors the current state of the channel in real time, including the strength of the signal, the noise level and other potential interference factors, based on these monitoring data, the frequency allocation module 205 can dynamically adjust the frequency allocation policy to select the frequency resource that is unoccupied or has the smallest interference, and the signal transmitting terminal device 206 adjusts the transmitting frequency according to the allocation result of the frequency allocation module 205, so as to achieve effective isolation between different signals, thereby avoiding mutual interference between them. The process realizes that the signal can occupy the best frequency band in the transmission process, and improves the overall communication efficiency and the stability of the signal.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
Although the present application has been described with reference to the above embodiments, it should be understood that the application is not limited thereto, but rather is capable of modification and variation without departing from the spirit and scope of the present application.
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