A molecular fingerprint-based terahertz communication transmission method, system, device and medium
By utilizing atmospheric molecular absorption patterns as a natural physical key, terahertz communication achieves resistance to quantum attacks and extremely high security, solving the vulnerability of physical layer security in existing technologies, ensuring successful decryption by legitimate recipients, and preventing eavesdroppers from decrypting.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SHENZHEN JIUZHOU ELECTRIC
- Filing Date
- 2026-06-04
- Publication Date
- 2026-07-10
AI Technical Summary
Existing physical layer security solutions for terahertz communication are vulnerable to quantum computing threats, while spatial isolation solutions pose a risk of leakage in real-world environments and are inefficient due to their reliance on additional resources.
By using atmospheric molecular absorption patterns as a natural physical key, and through data and key spectrum separation technology, legitimate recipients can decrypt based on their own location, while eavesdroppers cannot decrypt due to their different locations. The natural spatial differences of molecular fingerprints are used to bind the key and location.
It achieves strong resistance to quantum attacks, extremely high security, and can be correctly decrypted by legitimate recipients while being impossible for eavesdroppers. It does not rely on upper-layer algorithms and is highly engineered.
Smart Images
Figure FT_1 
Figure FT_2 
Figure FT_3
Abstract
Description
Technical Field
[0001] This invention relates to the field of wireless communication technology, and specifically to a terahertz communication transmission method, system, device, and medium based on molecular fingerprinting. Background Technology
[0002] Terahertz communication technology typically refers to wireless communication using electromagnetic waves with frequencies between 100 GHz and 10 THz. It offers data transmission capabilities at terahertz per second (Tbps) and is considered one of the key core technologies of sixth-generation (6G) mobile communication networks. However, with the practical application and engineering of terahertz communication in space environments, its physical layer security issues are becoming increasingly prominent: the powerful processing capabilities of quantum computers render traditional network encryption algorithms such as RSA and AES vulnerable, making it difficult to guarantee the security requirements of high-intensity communication.
[0003] Currently, research on physical layer security in terahertz communication mainly faces significant challenges in technologies such as spatial isolation, noise injection, beamforming, and channel key generation.
[0004] The high directivity of terahertz beams is used for spatial isolation, directing the main lobe energy to reduce the risk of bypass eavesdropping. However, recent research indicates that diffraction at building corners, scattering from wall coverings, and the presence of non-line-of-sight paths result in a high risk of main lobe signal leakage.
[0005] Artificial noise injection technology is a method by which the transmitter injects interference in unrelated directions to suppress eavesdroppers. However, due to the high path loss in the terahertz band, the additional injected noise will reduce the power of the signal itself, ultimately greatly reducing the effective coverage distance.
[0006] Beam nulling schemes based on reconfigurable smart surfaces (RIS) or frequency scanning arrays, and physical layer key generation schemes based on channel state information. The former suffers from insufficient null depth and slow dynamic response due to the inability to predict the location of eavesdroppers and the use of multiple eavesdroppers; while the latter utilizes the reciprocal time-varying nature of the wireless channel to establish a shared key between the sender and receiver. This uncertainty in channel characteristics leads to significant security vulnerabilities in this scheme.
[0007] In summary, existing terahertz communication physical layer security solutions either rely on computational complexity (vulnerable to quantum computing threats), spatial isolation (due to various sidelobe / diffraction leaks in real-world environments), or additional resource consumption (low energy and spectral efficiency). Therefore, there is an urgent need for a secure transmission scheme that deeply couples to the unique physical characteristics of the terahertz band, does not rely on upper-layer algorithms, possesses inherent spatial channel differences, and is highly engineered. Summary of the Invention
[0008] To address the aforementioned problems, this invention provides a terahertz communication transmission method, system, device, and medium based on molecular fingerprints. Atmospheric molecules possess unique physical properties, exhibiting resistance to quantum attacks and extremely high security. Utilizing the unique "absorption spectrum" generated by the selective absorption effect of water vapor and gas molecules in the terahertz band as a natural physical key, a dual-path transmission architecture is achieved through data and key spectrum separation technology. The signal transmission paths of legitimate receivers and senders are inherently unique. Therefore, only legitimate receivers can correctly decrypt the data based on their own location and molecular absorption characteristics. Eavesdroppers, due to different spatial locations resulting in different molecular absorption fingerprints, will fail to decrypt and cannot recover the original data. Furthermore, by leveraging the inherent spatial differences in molecular fingerprints, the key is deeply bound to the physical environment of a specific location, preventing eavesdroppers from deciphering the correct decryption key even if they intercept all electromagnetic signals.
[0009] This invention is achieved through the following technical solution:
[0010] A terahertz communication transmission method based on molecular fingerprinting, the method comprising:
[0011] The transmit and receive signal power ratio of each spatial point in the target area under different signal operating frequency bands is obtained, and the absorption spectrum feature vector of the medium molecules at each spatial point is obtained; the mapping relationship between the absorption spectrum feature vector and the spatial point coordinates, temperature and humidity information is constructed and stored in the fingerprint feature database;
[0012] The transmitter retrieves the absorption spectrum feature vector that matches the target spatial point from the fingerprint feature database, calculates the equivalent frequency offset of the corresponding signal operating frequency band using the absorption spectrum feature vector, and quantizes and encodes the equivalent frequency offset to generate a fingerprint key sequence; the data stream to be transmitted and the fingerprint key sequence are modulated respectively to obtain a dual-channel signal including data signal and fingerprint key signal and radiates it to the receiver.
[0013] After receiving the dual-channel signal, the receiver retrieves the absorption spectrum feature vector that matches its own location from the fingerprint feature database and calculates the actual equivalent frequency offset.
[0014] The fingerprint key signal is demodulated and decoded using the actual equivalent frequency offset, and the data signal is channel decoded using the fingerprint key sequence obtained from demodulation and decoding to obtain the original data stream.
[0015] Furthermore, the method also includes:
[0016] The transmitting end detects the signal quality parameters of the generated key signal. When the quality parameters of the key signal are lower than the preset threshold, the current signal operating frequency band is updated, and the receiving end is notified to update the current signal operating frequency band in the same way through the handshake control channel.
[0017] Furthermore, the transmit / receive signal power ratio of each spatial point within the target region under different signal operating frequency bands is obtained, resulting in the absorption spectrum feature vector of the medium molecules at each spatial point, specifically:
[0018] Terahertz channel measurements were performed at multiple spatial points within the target area to obtain the transmit / receive power ratio of each spatial point under different signal operating frequency bands.
[0019] Based on the transmit and receive signal power ratio of each spatial point under different signal operating frequency bands, the absorption spectrum of the medium molecules corresponding to each spatial point is constructed, and the absorption spectrum feature vector of the medium molecules at each spatial point is extracted from the absorption spectrum of the medium molecules.
[0020] The absorption spectrum feature vector of the medium molecules includes the peak height, peak width, and center frequency offset of the absorption peaks at different signal operating frequency bands.
[0021] Furthermore, the equivalent frequency offset is quantized and encoded to generate a fingerprint key sequence, specifically as follows:
[0022] The equivalent frequency offset is quantized and encoded to obtain the first subkey;
[0023] Obtain the retrieved absorption peak number and timestamp, and construct the second subkey;
[0024] A fingerprint key sequence is generated by combining the first subkey and the second subkey.
[0025] Furthermore, the data stream to be transmitted and the fingerprint key sequence are modulated separately to obtain a dual-channel signal including the data signal and the fingerprint key signal, specifically:
[0026] The data stream to be transmitted and the fingerprint key sequence are modulated separately to obtain a data signal located in the first signal operating frequency band and a fingerprint key signal located in the second signal operating frequency band; wherein the difference between the first signal operating frequency band and the second signal operating frequency band is greater than a preset frequency band threshold.
[0027] Furthermore, after demodulating and decoding the fingerprint key signal at the receiving end using the actual equivalent frequency offset, the method also includes:
[0028] The decoded fingerprint key sequence is evaluated. If the fingerprint key sequence is correct, the receiver is determined to be a legitimate receiver; otherwise, the receiver is determined to be an illegitimate receiver.
[0029] The present invention also provides a terahertz communication transmission system based on molecular fingerprints, which is used in any of the above-described terahertz communication transmission methods based on molecular fingerprints, the system comprising:
[0030] The fingerprint feature library construction module is used to obtain the transmit and receive signal power ratio of each spatial point in the target area under different signal operating frequency bands, and obtain the absorption spectrum feature vector of the medium molecules at each spatial point; the absorption spectrum feature vector is used to construct a mapping relationship between the spatial point coordinates and temperature and humidity information, and stored in the fingerprint feature library;
[0031] The dual-channel signal generation module is used by the transmitter to retrieve the absorption spectrum feature vector that matches the target spatial point from the fingerprint feature database, calculate the equivalent frequency offset of the corresponding signal operating frequency band using the absorption spectrum feature vector, and quantize and encode the equivalent frequency offset to generate a fingerprint key sequence; the data stream to be transmitted and the fingerprint key sequence are modulated respectively to obtain a dual-channel signal including data signal and fingerprint key signal and radiate it to the receiver.
[0032] The dual-channel signal decoding module is used by the receiver to retrieve the absorption spectrum feature vector that matches its own position from the fingerprint feature database after receiving the dual-channel signal, and calculate the actual equivalent frequency offset; demodulate and decode the fingerprint key signal using the actual equivalent frequency offset, and use the fingerprint key sequence obtained from demodulation and decoding to perform channel decoding on the data signal to obtain the original data stream.
[0033] The present invention also provides a computer device, including a system memory and a processor, wherein the system memory stores a computer program, and the processor executes the computer program to implement the steps of any of the methods described above.
[0034] The present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of any of the methods described above.
[0035] The present invention also provides a computer program product containing instructions that, when executed by a cluster of computer devices, cause the cluster of computer devices to perform the method described in any of the preceding claims.
[0036] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0037] In this invention, based on the physical laws of atmospheric molecular absorption, it is unaffected by advancements in quantum computing technology, possessing resistance to quantum attacks and extremely high security. It utilizes the unique "absorption spectrum" generated by the selective absorption effect of water vapor and gas molecules in the terahertz band as a natural physical key. A dual-path transmission architecture achieves spectral separation between data and the key, enabling legitimate receivers to correctly decrypt based on their own location's molecular absorption characteristics. Eavesdroppers, due to inconsistent molecular absorption fingerprints caused by different spatial locations, are unable to recover the original data. Simultaneously, by leveraging the natural spatial differences in molecular fingerprints, the key is deeply bound to the physical environment of a specific location, preventing eavesdroppers from deciphering the correct decryption key even if they intercept all electromagnetic signals. Attached Figure Description
[0038] To more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort. In the drawings:
[0039] Figure 1 This is a schematic diagram of the wireless communication system in this embodiment;
[0040] Figure 2 This is a schematic diagram illustrating the variation of water vapor molecule absorption intensity in the terahertz band in this embodiment;
[0041] Figure 3 This is a flowchart illustrating a terahertz communication transmission method based on molecular fingerprinting in this embodiment.
[0042] Figure 4 This is a schematic diagram illustrating the principle of frequency offset consistency decision differentiation in this embodiment;
[0043] Figure 5 This is a schematic diagram of the module connection of a terahertz communication transmission system based on molecular fingerprinting in this embodiment;
[0044] Figure 6 This is a schematic diagram of the structure of a computer device in this embodiment. Detailed Implementation
[0045] The exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding, and should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.
[0046] In this disclosure, unless otherwise stated, the use of terms such as "first," "second," etc., to describe various elements is not intended to limit the positional, temporal, or importance relationships of these elements; such terms are merely used to distinguish one element from another. In some examples, the first element and the second element may refer to the same instance of that element, while in other cases, based on the context, they may refer to different instances.
[0047] The terminology used in the description of the various examples in this disclosure is for the purpose of describing particular examples only and is not intended to be limiting. Unless the context explicitly indicates otherwise, an element may be one or more unless the number of elements is specifically limited. Furthermore, the term "and / or" as used in this disclosure covers any one of the listed items and all possible combinations thereof.
[0048] Example 1
[0049] This embodiment provides a terahertz communication transmission method based on molecular fingerprinting for use in a wireless communication system including a transmitter and a receiver. See [link to documentation]. Figure 1 , Figure 1 The diagram illustrates the structure of a wireless communication system. The transmitter simultaneously radiates data signals and fingerprint key signals into space through a terahertz phased array antenna. A legitimate receiver can correctly extract the key and decrypt the device based on the molecular absorption fingerprint of its own location. An eavesdropper, due to different locations, will have inconsistent molecular absorption fingerprints and will be unable to decrypt the device correctly. Figure 2 The diagram illustrates the variation in absorption intensity of water vapor molecules in the terahertz band. It shows that the absorption peak at 325 GHz exhibits the highest absorption intensity, and the absorption intensity at a fixed frequency also increases with increasing humidity. This demonstrates the time-varying characteristics of molecular fingerprints and the necessity of a dynamic update mechanism. (See also...) Figure 3 , Figure 3 A flowchart illustrating a terahertz communication transmission method based on molecular fingerprinting is shown, wherein the method includes:
[0050] S1: Obtain the transmit and receive signal power ratio of each spatial point in the target area under different signal operating frequency bands, and obtain the absorption spectrum feature vector of the medium molecules at each spatial point; construct a mapping relationship between the absorption spectrum feature vector and the spatial point coordinates, temperature and humidity information, and store it in the fingerprint feature database;
[0051] Specifically, in this embodiment, multiple spatial points are first selected within the target area, and terahertz channel measurements are performed on these points to obtain the transmit / receive power ratio of each spatial point under different signal operating frequency bands. Based on the transmit / receive power ratio of each spatial point under different signal operating frequency bands, after de-embedding calibration to eliminate system errors, the absorption spectrum of the medium molecules corresponding to each spatial point is constructed, and the absorption spectrum feature vector of the medium molecules at each spatial point is extracted from the absorption spectrum of the medium molecules. A mapping relationship is established between the absorption spectrum feature vector and the spatial point coordinates and temperature and humidity information, and stored in the fingerprint feature database. The absorption spectrum feature vector of the medium molecules includes the peak height, peak width, and center frequency offset of the absorption peak under different signal operating frequency bands.
[0052] It should be noted that in this embodiment, the selected spatial points cover different altitudes, water vapor concentrations, and microclimate environments. The specific number depends on the actual situation and can be 100, 200, or 300, which will not be elaborated further here. A terahertz vector network analyzer is used for terahertz channel measurement. Other measurement methods can be used in other embodiments, and no further restrictions are placed here. In this embodiment, the medium molecules are water vapor molecules, but in other embodiments, they can be oxygen molecules or other gas molecules, and no further restrictions are placed here. In this embodiment, frequency sweep measurements are performed in the 280GHz to 340GHz band with a step size of 1GHz. Other operating frequency bands can be included in other embodiments, and no further restrictions are placed here. During measurement at each spatial point, the signal power attenuation, phase shift, and noise floor rise at each preset frequency point are recorded, and characteristic parameters such as peak height, peak width, center frequency, and symmetry of the molecular absorption spectrum are extracted. The spatial point coordinates include latitude, longitude, and altitude.
[0053] S2: The transmitter retrieves the absorption spectrum feature vector that matches the target spatial point from the fingerprint feature database, calculates the equivalent frequency offset of the corresponding signal operating frequency band using the absorption spectrum feature vector, and quantizes and encodes the equivalent frequency offset to generate a fingerprint key sequence; the data stream to be transmitted and the fingerprint key sequence are modulated respectively to obtain a dual-channel signal including data signal and fingerprint key signal and radiates it to the receiver.
[0054] Specifically, in this embodiment, when the transmitter needs to send data to the receiver located at the target spatial point, the transmitter will retrieve the absorption spectrum feature vector that best matches the target spatial point from the fingerprint feature database; then, based on the absorption spectrum feature vector, it will calculate the equivalent frequency deviation of the corresponding signal operating frequency band, specifically: In the formula, This represents the equivalent frequency deviation. This indicates the preset scaling factor. Represents the target space point In the corresponding signal operating frequency band The actual absorption coefficient is determined; the equivalent frequency offset is quantized and encoded to obtain the first subkey; the absorption peak number and timestamp of the retrieved signal are obtained to construct the second subkey; the fingerprint key sequence is generated by combining the first subkey and the second subkey; the data stream to be transmitted and the fingerprint key sequence are modulated separately to obtain the data signal located in the first signal operating frequency band and the fingerprint key signal located in the second signal operating frequency band; wherein the difference between the first signal operating frequency band and the second signal operating frequency band is greater than the preset frequency band threshold.
[0055] It should be noted that in this embodiment, the fingerprint key sequence consists of 256 bits. The first 128 bits of the first subkey are obtained by quantizing and encoding the equivalent frequency offset, and the second 128 bits of the first subkey are constructed by the retrieved absorption peak number and timestamp.
[0056] Simultaneously, the data stream to be transmitted is modulated with 16QAM and mapped to a multi-carrier resource with a subcarrier spacing of 1.2MHz using OFDM technology, so that the center frequency of the data signal is located in the first signal operating frequency band, which is the terahertz atmospheric transparency window band (weak molecular absorption, ensuring communication rate), and LDPC forward error correction coding with a code rate of 3 / 4 is embedded; in this embodiment, the terahertz atmospheric transparency window band is set to 310GHz, and in other embodiments, it depends on the actual situation, which will not be elaborated here; the fingerprint key sequence is modulated with BPSK and mapped to another set of OFDM subcarriers, so that the center frequency of the key signal is located in the second signal operating frequency band, which is the terahertz molecular absorption sensitive band (i.e., near the water vapor molecule resonance absorption peak), which is set to 325GHz, and in other embodiments, it depends on the actual situation, which will not be elaborated here; the frequency spacing between the two sets of subcarriers is much larger than the subcarrier bandwidth, ensuring spectrum separation and no interference between them.
[0057] S3: After receiving the dual-channel signal, the receiver retrieves the absorption spectrum feature vector that matches its own position from the fingerprint feature database and calculates the actual equivalent frequency offset. The fingerprint key signal is demodulated and decoded using the actual equivalent frequency offset, and the data signal is channel decoded using the fingerprint key sequence obtained from the demodulation and decoding to obtain the original data stream.
[0058] Specifically, in this embodiment, after receiving the dual-channel signal, the receiving end first retrieves the absorption spectrum feature vector matching its own position from the fingerprint feature database and calculates the actual equivalent frequency offset. It then uses this actual equivalent frequency offset to demodulate and decode the fingerprint key signal, obtaining the demodulated and decoded fingerprint key sequence. The decoded fingerprint key sequence is then judged; if the fingerprint key sequence is correct, the receiving end is determined to be a legitimate receiving end; otherwise, it is determined to be an illegitimate receiving end. If an illegitimate receiving end uses an incorrect fingerprint key sequence to descramble the data signal, it will obtain scrambled data with a bit error rate exceeding 70%, making it impossible to recover any valid information. The legitimate receiving end uses the demodulated and decoded fingerprint key sequence as a descrambling seed to perform channel decoding on the data signal, obtaining the original data stream.
[0059] It should be noted that, in this embodiment, see Figure 4 , Figure 4 The diagram illustrates the principle of frequency offset consistency determination. There is a fundamental difference between legitimate and illegitimate receivers in their frequency offset consistency determination. The legitimate receiver first blindly acquires the key signal, calculating the actual equivalent frequency offset from a pre-loaded fingerprint feature database based on its own location. This value is then used to compensate for and synchronize the received key signal, successfully demodulating and decoding the fingerprint key sequence. Subsequently, the fingerprint key sequence is used as a descrambling seed to perform channel decoding and descrambling operations on the data signal, successfully recovering the original data stream. However, for illegitimate receivers located more than 10 meters away from the legitimate receiver, the difference is significant. At the receiving end, the water vapor density at its location differs from that at the location of the legitimate receiving end. The actual equivalent frequency offset calculated by the illegitimate receiving end is significantly different from that calculated by the legitimate receiving end. When Eve attempts to demodulate the key signal using its calculated actual equivalent frequency offset, the decoded key sequence is completely incorrect. Consequently, after descrambling the data signal, garbled data is obtained, and no valid information can be recovered. Simultaneously, the system performs a security decision: the receiving end extracts the actual frequency offset feature and calculates the matching degree with the pre-stored reference value. If the matching degree is less than 0.1, the output data is directly rejected.
[0060] Meanwhile, in this embodiment, when drastic changes in ambient humidity (such as rain or heavy fog) cause a decrease in the signal quality of the current signal operating frequency band, a dynamic update mechanism will be automatically triggered. Specifically, the transmitting end detects the signal quality parameters of the generated key signal. When the quality parameters of the key signal are lower than a preset threshold, the current signal operating frequency band is updated, and the receiving end is notified to perform the same update to the current signal operating frequency band through a handshake control channel. Here, the signal quality parameter is the signal-to-noise ratio or error vector. In other embodiments, other parameter settings may also be used.
[0061] Specifically, in this embodiment, in scenarios requiring higher security or longer communication distances, the system can pre-configure multiple molecular fingerprint reference sources (such as multiple water vapor absorption lines, oxygen absorption lines, etc.). Based on security level requirements, the transmitter randomly selects an absorption line as the fingerprint source at the start of each communication session and sends the selection information to the legitimate receiver via a secure control channel. Since eavesdroppers cannot predict the fingerprint frequency used in this session, and the spatial absorption characteristics of different frequencies have extremely low correlation, the difficulty of cracking is further increased.
[0062] It should be noted that, due to the large terahertz frequency range, the absorption lines of water vapor, oxygen, and nitrogen at different frequencies are all unique and possess corresponding quantifiable absorption attenuation coefficients. Each absorption line can be used independently as a molecular fingerprint reference source for encrypted data transmission. For example, water vapor molecules exhibit multiple (e.g., 321GHz / 325GHz / 337GHz) distinguishable absorption peaks in the terahertz operating frequency band (280~350 GHz); oxygen molecules have strong absorption peaks in different frequency ranges (50~70GHz); and nitrogen molecules exhibit weaker absorption peaks during long-distance transmission.
[0063] Therefore, in this embodiment, based on the description in S1 of this embodiment, frequency sweep measurements are performed on the absorption spectral characteristics of oxygen and nitrogen molecules at spatial points within the target coverage area. In this embodiment, frequency sweep measurements are performed in the oxygen absorption band of 50~70 GHz with a step size of 0.5 GHz, and characteristic parameters such as peak height, peak width, center frequency, and symmetry of the molecular absorption spectral lines are extracted at each spatial point; at the same time, the coordinates of the spatial point include the latitude, longitude, and altitude of the spatial point.
[0064] The molecular fingerprint feature of each spatial point will be expanded from a single water vapor absorption line feature to a vector group of multi-molecule absorption spectral features, and its characterization lattice vector is as follows: ;in Here, α is the absorption peak center frequency, ω is the absorption coefficient, and ω is the absorption peak half-width at half-maximum. This vector set is stored in association with spatial coordinate information to form a multi-fingerprint feature database. Each multi-molecule absorption spectral line will be identified with a unique number and timestamp, used for fingerprint source selection and switching signal transmission during communication.
[0065] Based on the different on-site channel environment and actual security requirements, the security level can be divided into three levels: standard, high, and highest level.
[0066] The standard security mode is suitable for routine secure communications and will use a single water vapor absorption spectral line as the fingerprint reference source.
[0067] In advanced security mode, a uniformly distributed random number generator produces an index. The corresponding water vapor or oxygen absorption spectrum line will serve as the fingerprint reference source for this session, ensuring the randomness of the absorption spectrum used in each session. When a legitimate receiver receives the fingerprint source selection instruction through the handshake control channel, it switches to the fingerprint key corresponding to the index for demodulation.
[0068] In the highest security mode, the system, building upon the advanced security mode, uses water vapor and oxygen absorption spectra sequentially as fingerprint reference sources for information transmission. Only when the information decrypted by the receiver from both the water vapor and oxygen absorption spectra is completely identical is the information considered truly accurate. In this method, because the water vapor molecule absorption spectrum is concentrated above 300 GHz, while the oxygen molecule absorption spectrum mainly covers the 50-70 GHz frequency band, the two molecular absorption spectra do not overlap in the frequency domain. They possess strong relative independence in their physical properties, making the probability of an eavesdropper accurately decrypting both keys simultaneously virtually zero.
[0069] Furthermore, the original data is divided into N parallel data streams, each independently encrypted using a single molecular absorption spectral line. A legitimate recipient must simultaneously demodulate the key using different frequencies and reconstruct and merge the N data streams to recover the original data. This encrypted communication method is suitable for extremely high-security applications, such as the transmission of core military and government data.
[0070] Example 2
[0071] See Figure 5 The present invention also provides a terahertz communication transmission system based on molecular fingerprints, which is used in any of the above-described terahertz communication transmission methods based on molecular fingerprints, the system comprising:
[0072] The fingerprint feature library construction module 100 is used to obtain the transmit and receive signal power ratio of each spatial point in the target area under different signal operating frequency bands, and obtain the absorption spectrum feature vector of the medium molecules at each spatial point; it constructs a mapping relationship between the absorption spectrum feature vector and the spatial point coordinates, temperature and humidity information, and stores it in the fingerprint feature library.
[0073] The dual-channel signal generation module 200 is used by the transmitter to retrieve the absorption spectrum feature vector that matches the target spatial point from the fingerprint feature database, calculate the equivalent frequency offset of the corresponding signal operating frequency band using the absorption spectrum feature vector, and quantize and encode the equivalent frequency offset to generate a fingerprint key sequence; modulate the data stream to be transmitted and the fingerprint key sequence respectively to obtain a dual-channel signal including data signal and fingerprint key signal and radiate it to the receiver.
[0074] The dual-channel signal decoding module 300 is used to retrieve the absorption spectrum feature vector that matches its own position from the fingerprint feature database after the receiver receives the dual-channel signal, and calculate the actual equivalent frequency offset; demodulate and decode the fingerprint key signal using the actual equivalent frequency offset, and use the fingerprint key sequence obtained by demodulation and decoding to perform channel decoding on the data signal to obtain the original data stream.
[0075] It should be noted that the modules in the system of Embodiment 2 correspond to the steps in the method of Embodiment 1. The steps in the method of Embodiment 1 have been described in detail in Embodiment 1, and the module content in the system will not be described in detail in this Embodiment 2.
[0076] Example 3
[0077] See Figure 6 This embodiment also provides a computer device, including a system memory 1005 and a processor 1001. The system memory 1005 stores a computer program, and the processor 1001 executes the computer program to implement the steps of any of the methods described above.
[0078] It should be noted that the processor 1001 is used to execute the steps in the above method embodiments according to the instructions in the program code. Alternatively, when the processor 1001 executes the computer program, it implements the functions of each module / unit in the above system / device embodiments.
[0079] Specifically, in this embodiment, the computer program can be divided into one or more modules / units, which are stored in the system memory 1005 and executed by the processor 1001 to complete this application. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the terminal device.
[0080] The terminal device can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor 1001 and a system memory 1005. Those skilled in the art will understand that this does not constitute a limitation on the terminal device; it may include more or fewer components than shown in the figures, or a combination of certain components, or different components. For example, the terminal device may also include an input / output device 1003, a network access device 1002, a bus 1006, etc.
[0081] The processor 1001 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.
[0082] System memory 1005 can be an internal storage unit of the terminal device, such as a hard drive or RAM. System memory 1005 can also be a storage device 1004 of the terminal device, such as an external hard drive, SmartMedia Card (SMC), Secure Digital (SD) card, or FlashCard. Furthermore, system memory 1005 can include both internal storage units and storage device 1004. System memory 1005 is used to store computer programs and other programs and data required by the terminal device. System memory 1005 can also be used to temporarily store data that has been output or will be output.
[0083] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0084] Example 4
[0085] This embodiment provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.
[0086] The computer-readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), registers, hard disks, optical fibers, compact disc read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof, or any other form of computer-readable storage medium in the art.
[0087] An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside within an application-specific integrated circuit (ASIC). In embodiments of the invention, the computer-readable storage medium can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device.
[0088] Example 5
[0089] This embodiment also provides a computer program product containing instructions that, when executed by a cluster of computer devices, cause the cluster of computer devices to perform the method described in Embodiment 1.
[0090] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A terahertz communication transmission method based on molecular fingerprinting, characterized in that the method... include: The transmit and receive signal power ratio of each spatial point in the target area under different signal operating frequency bands is obtained, and the absorption spectrum feature vector of the medium molecules at each spatial point is obtained. A mapping relationship is established between the absorption spectrum feature vector and the spatial point coordinates, temperature and humidity information, and then stored in the fingerprint feature database; The transmitter retrieves the absorption spectrum feature vector that matches the target spatial point from the fingerprint feature database, calculates the equivalent frequency offset of the corresponding signal operating frequency band using the absorption spectrum feature vector, and quantizes and encodes the equivalent frequency offset to generate a fingerprint key sequence; the data stream to be transmitted and the fingerprint key sequence are modulated respectively to obtain a dual-channel signal including data signal and fingerprint key signal and radiates it to the receiver. After receiving the dual-channel signal, the receiver retrieves the matching absorption spectrum feature vector from the fingerprint feature database based on its own location point and calculates the actual equivalent frequency offset. The fingerprint key signal is demodulated and decoded using the actual equivalent frequency offset, and the data signal is channel decoded using the fingerprint key sequence obtained from the demodulation and decoding to obtain the original data stream.
2. The terahertz communication transmission method based on molecular fingerprinting according to claim 1, characterized in that, The method also includes: The transmitting end detects the signal quality parameters of the generated key signal. When the quality parameters of the key signal are lower than the preset threshold, the current signal operating frequency band is updated, and the receiving end is notified to update the current signal operating frequency band in the same way through the handshake control channel.
3. The terahertz communication transmission method based on molecular fingerprinting according to claim 1, characterized in that, The transmit / receive signal power ratio at each spatial point within the target region under different signal operating frequency bands is obtained, resulting in the absorption spectrum feature vector of the medium molecules at each spatial point. Specifically: Terahertz channel measurements were performed at multiple spatial points within the target area to obtain the transmit / receive power ratio of each spatial point under different signal operating frequency bands. Based on the transmit and receive signal power ratio of each spatial point under different signal operating frequency bands, the absorption spectrum of the medium molecules corresponding to each spatial point is constructed, and the absorption spectrum feature vector of the medium molecules at each spatial point is extracted from the absorption spectrum of the medium molecules. The absorption spectrum feature vector of the medium molecules includes the peak height, peak width, and center frequency offset of the absorption peaks at different signal operating frequency bands.
4. The terahertz communication transmission method based on molecular fingerprinting according to claim 1, characterized in that, The equivalent frequency offset is quantized and encoded to generate a fingerprint key sequence, specifically as follows: The equivalent frequency offset is quantized and encoded to obtain the first subkey; Obtain the retrieved absorption peak number and timestamp, and construct the second subkey; A fingerprint key sequence is generated by combining the first subkey and the second subkey.
5. The terahertz communication transmission method based on molecular fingerprinting according to claim 1, characterized in that, The data stream to be transmitted and the fingerprint key sequence are modulated separately to obtain a dual-channel signal including the data signal and the fingerprint key signal, specifically: The data stream to be transmitted and the fingerprint key sequence are modulated separately to obtain a data signal located in the first signal operating frequency band and a fingerprint key signal located in the second signal operating frequency band; wherein the difference between the first signal operating frequency band and the second signal operating frequency band is greater than a preset frequency band threshold.
6. The terahertz communication transmission method based on molecular fingerprinting according to claim 1, characterized in that, After demodulating and decoding the fingerprint key signal at the receiving end using the actual equivalent frequency offset, the method further includes: The decoded fingerprint key sequence is evaluated. If the fingerprint key sequence is correct, the receiver is determined to be a legitimate receiver; otherwise, the receiver is determined to be an illegitimate receiver.
7. A terahertz communication transmission system based on molecular fingerprinting, characterized in that, This system is used in the terahertz communication transmission method based on molecular fingerprinting as described in any one of claims 1-6, the system comprising: The fingerprint feature library construction module is used to obtain the transmit and receive signal power ratio of each spatial point in the target area under different signal operating frequency bands, and obtain the absorption spectrum feature vector of the medium molecules at each spatial point; the absorption spectrum feature vector is used to construct a mapping relationship between the spatial point coordinates and temperature and humidity information, and stored in the fingerprint feature library; The dual-channel signal generation module is used by the transmitter to retrieve the absorption spectrum feature vector that matches the target spatial point from the fingerprint feature database, calculate the equivalent frequency offset of the corresponding signal operating frequency band using the absorption spectrum feature vector, and quantize and encode the equivalent frequency offset to generate a fingerprint key sequence; the data stream to be transmitted and the fingerprint key sequence are modulated respectively to obtain a dual-channel signal including data signal and fingerprint key signal and radiate it to the receiver. The dual-channel signal decoding module is used by the receiver to retrieve the absorption spectrum feature vector that matches its own position from the fingerprint feature database after receiving the dual-channel signal, and calculate the actual equivalent frequency offset; demodulate and decode the fingerprint key signal using the actual equivalent frequency offset, and use the fingerprint key sequence obtained from demodulation and decoding to perform channel decoding on the data signal to obtain the original data stream.
8. A computer device comprising a system memory and a processor, wherein the system memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.
9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method described in any one of claims 1 to 6.
10. A computer program product containing instructions, characterized in that, When the instructions are executed by a cluster of computer devices, the cluster of computer devices causes the cluster of computer devices to perform the method as described in any one of claims 1 to 6.