Wireless transmission modulation and demodulation method, wireless information transmission device, transmitting terminal and receiving terminal

Abstract

The invention discloses a wireless transmission modulation and demodulation method, a wireless information transmission device, a transmitting end and a receiving end, and relates to the field of wireless communication. The method comprises the following steps: firstly, acquiring a binary information code of to-be-transmitted information by a transmitting end, setting a code element width and a transmission bandwidth, and generating a multi-component periodic frequency modulation signal according to the code element width and the transmission bandwidth; modulating the binary information code to the multi-component periodic frequency modulation signal to generate a modulation signal; then the transmitting end adjusts the modulation signal to the transmitting frequency and transmits the modulation signal according to the specified power; the receiving end performs frequency conversion and digital processing on the received signal to obtain a digital received signal; detecting whether a to-be-detected multi-component periodic frequency modulation signal exists in the digital receiving signal or not, and determining the initial position of a code element; information on the modulation signal is demodulated into a binary information code by using a periodic resampling frequency domain energy detection mode; and the binary information code is decoded to obtain the transmitted information. According to the invention, the wireless transmission distance and reliability of information in a complex environment can be improved.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a wireless transmission modulation and demodulation method, a wireless information transmission device, a transmitting end, and a receiving end. Background Art

[0002] With the increase in the demand for informatization, the transmission of key information such as the safety status, distress information, and emergency instructions of people, livestock, and operating equipment in complex environments has attracted widespread attention. However, due to space and economic cost constraints, the transmission distance and reliability of existing wireless signal modulation and demodulation methods and information transmission equipment are difficult to meet the needs. For example, equipment based on chirp spread spectrum modulation has strong anti-Doppler and anti-multipath performance, and can achieve long-distance transmission with lower transmission power in a relatively open and less dynamic environment; however, in an urban multipath environment, its transmission distance is greatly reduced, and the reliability of information transmission is reduced in an environment with severe fading and large Doppler frequency shift due to heavy rainfall or rapid carrier movement. Diversity technology based on multiple antennas can improve the reliability of information transmission in selective fading channels, but it requires more accurate channel information, is more complex, and is not suitable for environments with rapid changes in channel conditions. Summary of the invention

[0003] In view of the problems existing in the above-mentioned prior art, the purpose of this application is to provide a wireless transmission modulation and demodulation method, a wireless information transmission device, a transmitter and a receiver, which can improve the wireless transmission distance and reliability of information in complex environments.

[0004] To achieve the above objectives, this application provides the following solutions.

[0005] In a first aspect, the present application provides a wireless transmission modulation and demodulation method, comprising:

[0006] The transmitter obtains the binary information code of the information to be transmitted and sets the code element width and transmission bandwidth;

[0007] The transmitting end generates a multi-component periodic frequency modulation signal according to the symbol width and the transmission bandwidth;

[0008] The transmitting end modulates the binary information code onto the multi-component periodic frequency modulation signal to generate a modulated signal;

[0009] The transmitter adjusts the modulated signal to the transmission frequency and transmits it at the specified power;

[0010] The receiving end performs frequency conversion and digital processing on the received signal to obtain a digital received signal;

[0011] The receiving end detects whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determines the starting position of the code element;

[0012] After the receiving end determines the starting position of the code element, it uses the periodic resampling frequency domain energy detection method to demodulate the information on the modulated signal into a binary information code;

[0013] The receiving end decodes the binary information code to obtain the transmitted information.

[0014] Optionally, the transmitting end obtains a binary information code of information to be transmitted, and sets a code element width and a transmission bandwidth, specifically including:

[0015] The transmitter obtains the information to be transmitted;

[0016] Binary encode the information to be transmitted to obtain a corresponding binary information code;

[0017] The symbol width T and transmission bandwidth B are set according to the transmission environment and transmission rate requirements.

[0018] Optionally, the transmitting end generates a multi-component periodic frequency modulation signal according to a symbol width and a transmission bandwidth, specifically including:

[0019] The transmitting end generates Z1 periodic frequency modulation signals as multi-component periodic frequency modulation signals; wherein Z1 is the number of components; the Z1 periodic frequency modulation signals satisfy the following conditions: the carrier frequencies are equal, the bandwidth is less than or equal to the transmission bandwidth B, the minimum common period P is one Nth of the code element width T; and N is a positive integer.

[0020] Optionally, the transmitting end modulates the binary information code onto a multi-component periodic frequency modulation signal to generate a modulated signal, specifically including:

[0021] The transmitter modulates the multi-component periodic frequency modulation signal according to the binary information code and the code element width T; when transmitting the binary code 1, it transmits Z1 periodic frequency modulation signals with a duration of T; when transmitting the binary code 0, no signal is transmitted for a duration of T.

[0022] Optionally, the receiving end performs frequency conversion and digital processing on the received signal to obtain a digital received signal, which specifically includes:

[0023] The receiving end uses Z2 antennas to receive signals, and performs frequency conversion and digital processing on the received signals. The received signals from each channel are superimposed to obtain a digital received signal S r =[x1,x2,x3,…,x t ,…]; where the subscript t=1,2,3,… represents the sampling point number; Z2 is a positive integer.

[0024] Optionally, the receiving end detects whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determines the starting position of the code element, specifically including:

[0025] The receiving end determines the observation window length L according to the set code element width T, and sets the observation window length L = T;

[0026] For S r Perform the starting end detection, slide the observation window starting position with a sampling point as the step length, and record the data sequence selected by the qth sliding observation window as S q =[x q ,x q+1 ,…,x q+L-1 ];

[0027] For the selected data sequence S q , starting from the first to the Pth sampling point, with P as the sampling interval, S q Resample to obtain P groups of resampled data sequences; the p-th group of resampled data sequences for the q-th sliding are recorded as S q_p =[x q+p-1 ,x q+p ,…,x q+p+n-1 ,…,x q+p+N ]; where n = 1, 2, ..., N; p = 1, 2, ..., P;

[0028] Calculate each set of resampled data sequence S q_p The spectrum sequence FFT (S q_P ), and add up the spectrum sequences of each group to obtain the sum spectrum sequence F of the data sequence corresponding to the qth sliding observation window q =|FFT(S q_1 )|+|FFT(S q_2 )|+…+|FFT(S q_P )|; where FFT() represents the calculation of the fast Fourier transform of the resampled data sequence; || represents taking the absolute value;

[0029] Detect and record the spectrum sequence F q The peak F q max ;

[0030] In the range of q<2T, determine the F q max The starting position x of the observation window that is the largest and greater than the set threshold q is the code element starting position x o .

[0031] Optionally, after determining the starting position of the code element, the receiving end demodulates the information on the modulated signal into a binary information code by using a periodic resampling frequency domain energy detection method, specifically including:

[0032] The receiving end calculates the starting position x of the code element o , according to the observation window length L, the data sequence Sq Segmentation, the g-th segment data sequence is S g =[x o+(g-1)T+1 ,x o+(g-1)T+2 ,…,x o+gT ];

[0033] For the g-th data sequence S g , starting from the 1st to the Pth sampling points, and taking P as the sampling interval, the sampling rate of S g Resample to obtain P groups of resampled data sequences; the pth group of resampled data sequences in the gth segment are recorded as S g_p =[x o+(g-1)T+p ,x o+(g-1)T+1+p, …,x o+(g-1)T+p+N ];

[0034] Calculate each set of resampled data sequence S g_p The spectrum sequence FFT (S g_P ), and add up each group of spectrum sequences to obtain the sum spectrum sequence F corresponding to the data of each sliding observation window g =|FFT(S g_1 )|+|FFT(S g_2 )|+…+|FFT(S g_P )|;

[0035] Detect and record the spectrum sequence F g The peak F g max ;

[0036] When F g max When it is greater than the set threshold, it is judged as binary code 1, otherwise it is judged as binary code 0. After the judgment is completed, the corresponding binary information code is obtained.

[0037] In a second aspect, the present application also provides a wireless information transmission device, including a transmitting end and a receiving end; the transmitting end and the receiving end are used to execute the wireless transmission modulation and demodulation method.

[0038] In a third aspect, the present application further provides a transmitting end of a wireless information transmission device, the transmitting end being used to perform the following steps:

[0039] Obtain the binary information code of the information to be transmitted, and set the code element width and transmission bandwidth;

[0040] Generate a multi-component periodic frequency modulation signal according to the symbol width and the transmission bandwidth;

[0041] Modulating a binary information code onto a multi-component periodic frequency modulation signal to generate a modulated signal;

[0042] Adjust the modulated signal to the transmit frequency and transmit at the specified power.

[0043] In a fourth aspect, the present application further provides a receiving end of a wireless information transmission device, the receiving end being configured to perform the following steps:

[0044] Performing frequency conversion and digital processing on the received signal to obtain a digital received signal;

[0045] Detect whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determine the starting position of the code element;

[0046] After determining the starting position of the code element, the information on the modulated signal is demodulated into a binary information code using a periodic resampling frequency domain energy detection method;

[0047] Decode the binary information code to obtain the transmitted information.

[0048] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0049] The present application provides a wireless transmission modulation and demodulation method, a wireless information transmission device, a transmitter and a receiver. The transmitter generates a multi-component periodic frequency modulation signal according to the code element width and the transmission bandwidth, and modulates the binary information code onto the multi-component periodic frequency modulation signal for transmission. The multi-component periodic frequency modulation signal has the characteristics of frequency domain energy dispersion and low peak power, and has strong energy concentration and strong anti-multipath interference capability after periodic resampling at the receiving end. Therefore, under the conditions of equivalent transmission power, transmission bandwidth and code element rate, the processing gain of the wireless transmission modulation and demodulation method of the present application is greatly improved, and is not affected by multipath interference, and has a strong ability to resist Doppler frequency shift, which greatly improves the wireless transmission distance and reliability of information in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 A schematic diagram of a flow chart of a wireless transmission modulation and demodulation method;

[0052] Figure 2 The present invention is a schematic diagram showing the principle of a wireless transmission modulation and demodulation method. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] The purpose of this application is to propose a wireless transmission modulation and demodulation method, a wireless information transmission device, a transmitter and a receiver that are resistant to Doppler frequency shift and multipath interference, so as to improve the wireless transmission distance and reliability of information in a complex environment with large path loss and severe Doppler frequency shift and multipath interference.

[0055] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0056] In an exemplary embodiment, the present application provides a wireless transmission modulation and demodulation method. Figure 1 and Figure 2 As shown, the wireless transmission modulation and demodulation method includes the following steps 1 to 8.

[0057] Step 1: The transmitter obtains the binary information code of the information to be transmitted and sets the code element width and transmission bandwidth.

[0058] The transmitting end first obtains the information to be transmitted, which may be various key information that needs to be transmitted, such as alarm information, distress information, emergency command information, safety status information, etc., generated by the activities of people and livestock or equipment operation in a complex environment.

[0059] By binary encoding the information to be transmitted, the corresponding binary information code can be obtained. Furthermore, the symbol width T and the transmission bandwidth B need to be set according to the transmission environment and transmission rate requirements.

[0060] Step 2: The transmitter generates a multi-component periodic frequency modulation signal according to the symbol width and transmission bandwidth.

[0061] The transmitter generates Z1 periodic frequency modulation signals required for transmitting information according to the set conditions as multi-component periodic frequency modulation signals. Where Z1 is the number of components and Z1 is a positive integer. The Z1 periodic frequency modulation signals meet the following conditions: the carrier frequencies are equal, the bandwidth is not greater than the transmission bandwidth B, the minimum common period P is one Nth of the code element width T; N is a positive integer, generally N is greater than 32.

[0062] Step 3: The transmitter modulates the binary information code onto the multi-component periodic frequency modulation signal to generate a modulated signal.

[0063] The transmitter performs multi-component periodic frequency modulation signal modulation according to the binary information code and the code element width T. The specific process is as follows: when the binary code "1" is transmitted, the Z1 periodic frequency modulation signals generated in step 2 are transmitted, and the duration is T; when the binary code "0" is transmitted, no signal is transmitted within the time of T.

[0064] There are two specific ways to transmit multi-component periodic frequency modulated signals: 1) Z1 components (i.e., Z1 periodic frequency modulated signals) are respectively transmitted by Z1 different RF channels and antennas, which can avoid power amplifier distortion caused by a large peak-to-average power ratio and reduce the requirements for power amplification; 2) Z1 components are added together and then transmitted using a single RF channel and antenna, which can reduce hardware complexity.

[0065] Step 4: The transmitter adjusts the modulated signal to the transmission frequency and transmits it at the specified power.

[0066] That is, the modulated signal generated in step 3 is frequency-converted, adjusted to the transmission frequency, and then transmitted at the specified power. The frequency and power of the transmission signal can be set according to actual needs. After the transmission signal is transmitted through the channel, it is received by the receiving end.

[0067] Step 5: The receiving end performs frequency conversion and digitization on the received signal to obtain a digitized received signal.

[0068] The receiving end uses Z2 antennas to receive signals, and performs frequency conversion and digital processing on the received signals. The received signals from each channel are superimposed to obtain a digital received signal S r ; Where Z2 is a positive integer. Specifically, S r =[x1,x2,x3,…,x t ,…]; where the subscript t = 1, 2, 3, … represents the sampling point number, for example, x t It represents the tth sampling point.

[0069] Step 6: The receiving end detects whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determines the starting position of the code element.

[0070] The receiving end determines the observation window length L according to the set code element width T, and makes the observation window length equal to the code element width, that is, L = T. Then, r Perform the starting end detection, the specific process is as follows.

[0071] Step 6.1: Slide the observation window starting position with a sampling point as the step length, and record the data sequence selected by the qth sliding observation window as S q =[x q ,x q+1 ,…,x q+L-1 ].

[0072] Step 6.2: For the selected data sequence S q , starting from the first to the Pth sampling point, with P as the sampling interval, S q Resample to obtain P groups of resampled data sequences; where P is the minimum common period; the pth group of resampled data sequences for the qth sliding are recorded as S q_p =[x q+p-1 ,x q+p ,…,x q+p+n-1 ,…,x q+p+N ]; where n = 1, 2,…, N; p = 1, 2,…, P.

[0073] Step 6.3: Calculate each set of resampled data sequence S q_p The spectrum sequence FFT (S q_P ), and add up the spectrum sequences of each group to obtain the sum spectrum sequence F of the data sequence corresponding to the qth sliding observation window q =|FFT(S q_1 )|+|FFT(S q_2 )|+…+|FFT(S q_P )|. FFT() represents the calculation of the fast Fourier transform of the resampled data sequence to obtain its corresponding spectrum sequence. || represents taking the absolute value of each element in the resampled data sequence.

[0074] Step 6.4: Detect and record the sum spectrum sequence F q The peak F q max .

[0075] Step 6.5: In the range where the number of observation window slides is less than 2 times the symbol width, that is, in the range of q<2T, determine the value of F q max The starting position x of the observation window that is the largest and greater than the set threshold q is the code element starting position x o .

[0076] The threshold value can be determined by using the constant false alarm detection principle, the mean absolute variance method, and other methods. o , which means that the digitized received signal contains multi-component periodic frequency modulation signals to be detected.

[0077] Step 7: After the receiving end determines the starting position of the code element, it uses the periodic resampling frequency domain energy detection method to demodulate the information on the modulated signal into a binary information code.

[0078] The demodulation and decoding process specifically includes:

[0079] Step 7.1: The receiver estimates the starting position x of the code elemento , according to the observation window length L, the data sequence S q Segmentation, the g-th segment data sequence is S g =[x o+(g-1)T+1 ,x o+(g-1)T+2 ,…,x o+gT ].

[0080] Step 7.2: For the g-th data sequence S g , starting from the 1st to the Pth sampling points, and taking P as the sampling interval, the sampling rate of S g Resample to obtain P groups of resampled data sequences; the pth group of resampled data sequences in the gth segment are recorded as S g_p =[x o+(g-1)T+p ,x o+(g-1)T+1+p, …,x o+(g-1)T+p+N ].

[0081] Step 7.3: Calculate each set of resampled data sequence S g_p The spectrum sequence FFT (S g_P ), and add up each group of spectrum sequences to obtain the sum spectrum sequence F corresponding to the data of each sliding observation window g =|FFT(S g_1 )|+|FFT(S g_2 )|+…+|FFT(S g_P )|; FFT() represents the calculation of the Fast Fourier Transform of the resampled data sequence; || represents taking the absolute value of each element in the resampled data sequence.

[0082] Step 7.4: Detect and record the sum spectrum sequence F g The peak F g max .

[0083] Step 7.5: When F g max When it is greater than the set threshold, it is judged as binary code "1", otherwise it is judged as binary code "0", and the corresponding binary information code is obtained after the judgment is completed.

[0084] After the above demodulation and decoding process, the binary information code of the transmitter is restored.

[0085] Step 8: The receiving end decodes the binary information code to obtain the transmitted information.

[0086] The above steps 6-7 realize the detection of multi-component periodic frequency modulation signals based on the periodic resampling frequency domain energy detection method, detect whether there is a communication signal in the channel and perform synchronization alignment; by judging the information on each code element, the information on the modulated signal is demodulated into a binary information code. The receiving end decodes the binary information code obtained after the judgment to obtain the transmitted information.

[0087] A wireless transmission modulation and demodulation method provided by the present application is based on the advantages of frequency domain energy dispersion, low peak power, strong energy concentration and strong anti-multipath interference ability of multi-component (Z1 components) periodic frequency modulation signals after periodic resampling, which alleviates the problem that the existing wireless signal modulation and demodulation methods are insufficient in energy utilization in the time and frequency domain, and are difficult to provide sufficient modulation gain, anti-multipath interference and environmental interference, resulting in degradation or even failure of wireless communication performance. Under the conditions of equivalent transmission power, transmission bandwidth and symbol rate, the processing gain of the wireless transmission modulation and demodulation method of the present application is improved by about Z1×Z2 times compared with the chirp spread spectrum modulation non-coherent demodulation method, and is not affected by multipath interference, and has a strong ability to resist Doppler frequency shift, which greatly improves the wireless transmission distance and reliability of information in complex environments.

[0088] In an exemplary embodiment, the present application also provides a wireless information transmission device, including a transmitting end and a receiving end; the transmitting end and the receiving end are used to execute the wireless transmission modulation and demodulation method.

[0089] Of course, in other exemplary embodiments, the transmitting end and the receiving end can also be used as independent devices, or be separately arranged in different communication devices and computing devices for use. The communication device / computing device can be a server or a terminal. The communication device / computing device includes a processor, a memory, an input / output interface and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the communication device / computing device is used to provide computing and control capabilities. The memory of the communication device / computing device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection.

[0090] Therefore, in an exemplary embodiment, the present application also provides a transmitting end of a wireless information transmission device, wherein the transmitting end is used to perform the following steps:

[0091] Obtain the binary information code of the information to be transmitted, and set the code element width and transmission bandwidth;

[0092] Generate a multi-component periodic frequency modulation signal according to the symbol width and the transmission bandwidth;

[0093] Modulating a binary information code onto a multi-component periodic frequency modulation signal to generate a modulated signal;

[0094] Adjust the modulated signal to the transmit frequency and transmit at the specified power.

[0095] In an exemplary embodiment, the present application also provides a receiving end of a wireless information transmission device, wherein the receiving end is used to perform the following steps:

[0096] Performing frequency conversion and digital processing on the received signal to obtain a digital received signal;

[0097] Detect whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determine the starting position of the code element;

[0098] After determining the starting position of the code element, the information on the modulated signal is demodulated into a binary information code using a periodic resampling frequency domain energy detection method;

[0099] Decode the binary information code to obtain the transmitted information.

[0100] The use of the wireless transmission modulation and demodulation method, wireless information transmission device, transmitter and receiver of the present application can improve the wireless transmission distance and reliability of information in environments with large path loss, Doppler frequency shift and severe multipath interference, and provide an effective and highly reliable technical means for the transmission of status information of active personnel, livestock and equipment in complex environments, especially alarm information.

[0101] It should be noted that the information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0102] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0103] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A wireless transmission modulation and demodulation method, characterized in that: include: The transmitter obtains the binary information code of the information to be transmitted and sets the code element width and transmission bandwidth; The transmitting end generates a multi-component periodic frequency modulation signal according to the symbol width and the transmission bandwidth; The transmitting end modulates the binary information code onto the multi-component periodic frequency modulation signal to generate a modulated signal; The transmitter adjusts the modulated signal to the transmission frequency and transmits it at the specified power; The receiving end performs frequency conversion and digital processing on the received signal to obtain a digital received signal; The receiving end detects whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determines the starting position of the code element; After the receiving end determines the starting position of the code element, it uses the periodic resampling frequency domain energy detection method to demodulate the information on the modulated signal into a binary information code; The receiving end decodes the binary information code to obtain the transmitted information.

2. The wireless transmission modulation and demodulation method according to claim 1, characterized in that: The transmitting end obtains the binary information code of the information to be transmitted and sets the code element width and the transmission bandwidth, specifically including: The transmitter obtains the information to be transmitted; Binary encode the information to be transmitted to obtain a corresponding binary information code; The symbol width T and transmission bandwidth B are set according to the transmission environment and transmission rate requirements.

3. The wireless transmission modulation and demodulation method according to claim 2, characterized in that: The transmitting end generates a multi-component periodic frequency modulation signal according to the symbol width and the transmission bandwidth, specifically including: The transmitting end generates Z1 periodic frequency modulation signals as multi-component periodic frequency modulation signals; wherein Z1 is the number of components; the Z1 periodic frequency modulation signals satisfy the following conditions: the carrier frequencies are equal, the bandwidth is less than or equal to the transmission bandwidth B, the minimum common period P is one Nth of the code element width T; and N is a positive integer.

4. The wireless transmission modulation and demodulation method according to claim 3, characterized in that: The transmitting end modulates the binary information code onto the multi-component periodic frequency modulation signal to generate a modulated signal, specifically including: The transmitter modulates the multi-component periodic frequency modulation signal according to the binary information code and the code element width T; when transmitting the binary code 1, it transmits Z1 periodic frequency modulation signals with a duration of T; when transmitting the binary code 0, no signal is transmitted for a duration of T.

5. The wireless transmission modulation and demodulation method according to claim 4, characterized in that: The receiving end performs frequency conversion and digital processing on the received signal to obtain a digital received signal, which specifically includes: The receiving end uses Z2 antennas to receive signals, and performs frequency conversion and digital processing on the received signals. The received signals from each channel are superimposed to obtain a digital received signal S r =[x1,x2,x3,…,x t ,…]; where the subscript t=1,2,3,… represents the sampling point number; Z2 is a positive integer.

6. The wireless transmission modulation and demodulation method according to claim 5, characterized in that: The receiving end detects whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determines the starting position of the code element, specifically including: The receiving end determines the observation window length L according to the set code element width T, and sets the observation window length L = T; For S r Perform the starting end detection, slide the observation window starting position with a sampling point as the step length, and record the data sequence selected by the qth sliding observation window as S q =[x q ,x q+1 ,…,x q+L-1 ]; For the selected data sequence S q , starting from the first to the Pth sampling point, with P as the sampling interval, S q Resample to obtain P groups of resampled data sequences; the p-th group of resampled data sequences for the q-th sliding are recorded as S q_p =[x q+p-1 ,x q+p ,…,x q+p+n-1 ,…,x q+p+N ]; where n = 1, 2, ..., N; p = 1, 2, ..., P; Calculate each set of resampled data sequence S q_p The spectrum sequence FFT (S q_P ), and add up the spectrum sequences of each group to obtain the sum spectrum sequence F of the data sequence corresponding to the qth sliding observation window q =|FFT(S q_1 )|+|FFT(S q_2 )|+…+|FFT(S q_P )|; where FFT() represents the calculation of the fast Fourier transform of the resampled data sequence; || represents taking the absolute value; Detect and record the spectrum sequence F q The peak F q max ; In the range of q<2T, determine the F q max The starting position x of the observation window that is the largest and greater than the set threshold q is the code element starting position x o .

7. The wireless transmission modulation and demodulation method according to claim 6, characterized in that: After the receiving end determines the starting position of the code element, the information on the modulated signal is demodulated into a binary information code by using a periodic resampling frequency domain energy detection method, specifically including: The receiving end calculates the starting position x of the code element o , according to the observation window length L, the data sequence S q Segmentation, the g-th segment data sequence is S g =[x o+(g-1)T+1 ,x o+(g-1)T+2 ,…,x o+gT ]; For the g-th data sequence S g , starting from the 1st to the Pth sampling points, and taking P as the sampling interval, the sampling rate of S g Resample to obtain P groups of resampled data sequences; the pth group of resampled data sequences in the gth segment are recorded as S g_p =[x o+(g-1)T+p ,x o+(g-1)T+1+p, …,x o+(g-1)T+p+N ]; Calculate each set of resampled data sequence S g_p The spectrum sequence FFT (S g_P ), and add up each group of spectrum sequences to obtain the sum spectrum sequence F corresponding to the data of each sliding observation window g =|FFT(S g_1 )|+|FFT(S g_2 )|+…+|FFT(S g_P )|; Detect and record the spectrum sequence F g The peak F g max ; When F g max When it is greater than the set threshold, it is judged as binary code 1, otherwise it is judged as binary code 0. After the judgment is completed, the corresponding binary information code is obtained.

8. A wireless information transmission device, characterized in that: It comprises a transmitting end and a receiving end; the transmitting end and the receiving end are used to execute the wireless transmission modulation and demodulation method according to any one of claims 1-7.

9. A transmitting end of a wireless information transmission device, characterized in that: The transmitting end is used to perform the following steps: Obtain the binary information code of the information to be transmitted, and set the code element width and transmission bandwidth; Generate a multi-component periodic frequency modulation signal according to the symbol width and the transmission bandwidth; Modulating a binary information code onto a multi-component periodic frequency modulation signal to generate a modulated signal; Adjust the modulated signal to the transmit frequency and transmit at the specified power.

10. A receiving end of a wireless information transmission device, characterized in that: The receiving end is used to perform the following steps: Performing frequency conversion and digital processing on the received signal to obtain a digital received signal; Detect whether there is a multi-component periodic frequency modulation signal to be detected in the digitized received signal and determine the starting position of the code element; After determining the starting position of the code element, the information on the modulated signal is demodulated into a binary information code using a periodic resampling frequency domain energy detection method; Decode the binary information code to obtain the transmitted information.

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