Millimeter wave pulse signal modulation method

Abstract

The invention relates to a millimeter wave pulse signal modulation method, which relates to the technical field of pulse signal modulation, and comprises the following steps: carrying out adaptive bit width serial-parallel conversion, coding, verification and encryption preprocessing on a digital baseband signal to generate a baseband modulation signal meeting millimeter wave transmission requirements; a millimeter wave carrier is generated, and high-precision frequency stabilization and amplitude-phase calibration are completed; a pulse signal frame structure is constructed, and framing packaging of the baseband modulation signal is completed; pulse amplitude and pulse position modulation are fused to complete millimeter wave pulse modulation; step-by-step power amplification is carried out on the modulation signals, and harmonic components are filtered out; shaping, filtering and optimizing a frequency spectrum for the amplified signal; signal parameters are collected and dynamically calibrated, and modulation signals meeting the millimeter wave pilot frequency duplex transmission standard are generated. According to the invention, full-flow optimization of millimeter wave pulse signal modulation is realized, baseband signal processing safety and carrier stability are improved, modulation signal quality and multi-beam transmission balance are optimized, and the method is adaptive to various application scenarios of millimeter wave high-speed broadband communication.

Description

Technical Field

[0001] This invention relates to the field of pulse signal modulation technology, and more particularly to a millimeter-wave pulse signal modulation method. Background Technology

[0002] Millimeter-wave communication, with its large bandwidth and high speed characteristics in the 30-300 GHz frequency band, has become a core technology for medium- and long-distance wireless communication, emergency communication, and marine navigation. The technical requirements of heterogeneous frequency duplexing and multi-beam transmission place stringent standards on the overall performance of millimeter-wave pulse signal modulation. As a core component of millimeter-wave communication, the processing effect of pulse signal modulation directly determines the stability, transmission efficiency, and anti-interference capability of the communication. Existing millimeter-wave pulse signal modulation technologies often employ single encoding or verification methods in the baseband signal processing stage, lacking an integrated design of encryption, verification, and code transformation. Furthermore, the baseband signal rate is often fixed and cannot be dynamically adjusted according to the real-time available bandwidth of the millimeter-wave channel, easily leading to a mismatch between the rate and the channel bandwidth. While some solutions incorporate simple signal processing procedures, they fail to eliminate the DC bias of the baseband signal, which can easily cause carrier signal bias distortion during subsequent modulation, affecting the overall quality of the modulated signal.

[0003] The technical shortcomings in the millimeter-wave carrier generation stage directly restrict the modulation effect. Existing technologies generate millimeter-wave carrier signals with insufficient frequency stabilization accuracy, large phase noise and amplitude fluctuations, and fixed carrier frequencies. This prevents real-time detection of channel interference characteristics and adaptive switching based on transmission quality. When the current carrier frequency encounters strong interference, manual intervention is required, hindering rapid adaptation and leading to signal transmission interruption. The modulation stage often employs a single pulse amplitude modulation or pulse position modulation method, failing to combine the advantages of both methods in a hybrid design or dynamically switch modulation modes based on channel signal-to-noise ratio, transmission loss, and other parameters. This results in inefficient spectrum utilization under good channel conditions and compromised transmission reliability under poor channel conditions. Furthermore, the fixed pulse signal frame structure design prevents dynamic optimization of the pulse duty cycle based on channel bandwidth and signal rate, making it difficult to balance signal transmission efficiency and channel utilization within the frame. In multi-beam transmission scenarios, there is a lack of amplitude compensation design for different beam directions. Differences in antenna gain and channel transmission loss across beam directions lead to uneven signal transmission power, exacerbating interference between multiple users.

[0004] The power amplification, shaping filtering, and output calibration stages of millimeter-wave pulse modulation signals also present numerous technical challenges. Traditional power amplification circuits struggle to balance the demands of linear signal amplification and amplification efficiency, easily generating significant harmonics and intermodulation distortion components during amplification, directly degrading the quality of the modulated signal. Shaping filters often employ ordinary bandpass filters, failing to effectively suppress inter-symbol interference, and the out-of-band attenuation characteristics of the modulated signal are difficult to meet the specifications for millimeter-wave transmission. Output calibration only performs simple detection on single parameters such as amplitude and phase, lacking a closed-loop feedback dynamic calibration mechanism. Furthermore, the absence of a high-precision time synchronization signal results in insufficient synchronization accuracy between the transmitting and receiving ends. Combined with the millimeter-wave inter-frequency duplex operating mode, the signal crosstalk problem between the transmitting and receiving links remains unresolved. Moreover, existing technologies lack robust real-time monitoring and fault self-repair mechanisms for the modulation signal. When modulation signal parameters deviate from the normal range or hardware failures occur in the modulation circuit, timely automatic correction and link switching are impossible, leading to unreliable continuous output of millimeter-wave pulse modulation signals and making it difficult to meet the complex transmission requirements of millimeter-wave high-speed broadband, long-distance, and multi-beam transmission. Summary of the Invention

[0005] The present invention addresses the problems mentioned in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a millimeter-wave pulse signal modulation method, comprising the following steps: The baseband signal preprocessing steps involve adaptive bit-width serial-to-parallel conversion and code transformation of the input digital baseband signal, insertion of frame synchronization identifier, completion of error detection through CRC redundancy check, and generation of a baseband modulation signal that meets the requirements of millimeter wave transmission after symmetrical encryption. The millimeter-wave carrier generation step involves generating a target frequency band millimeter-wave carrier signal based on direct digital frequency synthesis technology, achieving high-precision frequency stabilization through a phase-locked loop circuit, and completing calibration by combining a phase and amplitude calibration module. The steps for constructing a pulse signal frame structure are as follows: according to the requirements of transmission bandwidth and rate matching, a pulse signal frame structure containing pilot code segment, data transmission segment, and verification feedback segment is constructed, the baseband modulation signal is allocated to the corresponding time slot, a reference signal is inserted, and framed encapsulation and structured transmission are completed. The multi-dimensional pulse modulation step mixes the framed baseband modulation signal with the millimeter-wave carrier pulse modulation, integrates multiple modulation methods, and allocates amplitude levels and pulse position offsets according to the signal symbol characteristics to complete the efficient conversion to the millimeter-wave pulse modulation signal. The modulation signal power amplification step uses a multi-stage linear amplifier circuit to amplify the millimeter-wave pulse modulation signal step by step, and a harmonic suppression circuit filters out harmonic components so that the transmission power meets the requirements of long-distance transmission while maintaining signal linearity. The signal shaping and filtering step involves using a high-precision bandpass filter circuit to shape and filter the amplified modulated signal, thereby removing out-of-band spurious interference. The modulation signal output calibration step involves real-time acquisition of the amplitude, phase, and frequency parameters of the output signal, comparison with preset reference parameters, and dynamic calibration of the signal parameters through a closed-loop feedback adjustment circuit to generate a modulation signal that conforms to the millimeter-wave frequency-duplex transmission standard.

[0007] Furthermore, it also includes source coding and dynamic rate adaptation steps for the baseband signal. Before the baseband signal preprocessing step, the original digital baseband signal is subjected to lossless source compression coding. The transmission rate of the baseband signal is dynamically adjusted according to the real-time transmission bandwidth of the millimeter-wave channel. At the same time, the DC bias of the baseband signal is eliminated through a DC component elimination circuit.

[0008] Furthermore, it also includes a frequency adaptive switching step for millimeter-wave carriers. In the millimeter-wave carrier generation step, the frequency interference characteristics and channel transmission quality of the millimeter-wave channel are detected in real time. When strong interference or transmission quality degradation is detected at the current carrier frequency, the idle frequency point in the frequency band is automatically switched according to the preset frequency switching sequence, the corresponding millimeter-wave carrier signal is regenerated, and rapid frequency stabilization and calibration are completed.

[0009] Furthermore, the multi-dimensional pulse modulation step also includes an adaptive switching logic for modulation modes, which collects the signal-to-noise ratio and transmission loss parameters of the millimeter-wave channel in real time. When the channel signal-to-noise ratio is higher than a preset threshold, a combination mode of high-order pulse amplitude modulation and fine pulse position modulation is adopted. When the channel signal-to-noise ratio is lower than a preset threshold, it switches to a combination mode of low-order pulse amplitude modulation and coarse-grained pulse position modulation.

[0010] Furthermore, a dynamic optimization logic for the pulse duty cycle is introduced in the pulse signal frame structure construction step. The optimal pulse duty cycle is calculated through the real-time matching relationship between channel bandwidth and signal rate. The optimization formula is as follows: ,in The optimal duty cycle for millimeter-wave pulse signals. This is the duty cycle nonlinear adjustment coefficient. The real-time available bandwidth for millimeter-wave channels. For channel rate adaptation coefficient, This represents the actual transmission rate of the baseband modulated signal. The maximum pulse duty cycle supported by the system. This is the minimum pulse duty cycle supported by the system.

[0011] Furthermore, the modulation signal power amplification step adopts the Doherty power amplifier circuit architecture, which divides the amplifier circuit into a main amplification path and an auxiliary amplification path. The working state of the auxiliary amplification path is dynamically adjusted according to the amplitude change of the millimeter-wave pulse modulation signal, thereby improving the power amplification efficiency while maintaining linear signal amplification. At the same time, the intermodulation distortion component generated during the amplification process is filtered out through the intermodulation distortion suppression circuit.

[0012] Furthermore, in the signal shaping and filtering step, a raised cosine roll-off filter is used to shape the modulated signal. The roll-off coefficient is set to 0.2 to 0.8 according to the actual code rate of the millimeter-wave pulse modulation signal to optimize the amplitude-frequency and phase-frequency characteristics of the filter, while ensuring that the out-of-band attenuation characteristics of the modulated signal conform to the spectrum specifications of millimeter-wave transmission.

[0013] Furthermore, in the modulation signal output calibration step, multi-beamforming technology is incorporated to introduce modulation signal amplitude compensation logic. The amplitude of the modulation signal is compensated based on the antenna gain and channel transmission loss in different beam directions. The compensation formula is as follows: ,in For the first Each beam in direction The amplitude value after compensation This is the reference amplitude value for the millimeter-wave pulse modulation signal. This represents the maximum gain of the antenna array. For the first Each beam in direction The actual antenna gain value is as follows. For direction Real-time transmission loss of millimeter-wave channels under these conditions This refers to the channel transmission loss in the reference transmission direction.

[0014] Furthermore, the modulation signal output calibration step incorporates a BeiDou or GPS time synchronization signal, which is used as the calibration reference to complete the time synchronization calibration of the millimeter-wave pulse modulation signal. At the same time, combined with the millimeter-wave frequency duplex working mode, the signal parameters of the transmitting link and the receiving link are independently calibrated through the link isolation calibration circuit.

[0015] Furthermore, it also includes real-time monitoring and fault self-repair steps for millimeter-wave pulse modulation signals. The key parameters of the output millimeter-wave pulse modulation signal are monitored in real time through a multi-parameter monitoring module. When any parameter is detected to deviate from the preset normal range, the circuit parameters of the corresponding modulation link are automatically adjusted for real-time correction. If a hardware fault or link interruption is detected in the modulation circuit, it immediately switches to the backup millimeter-wave modulation link to re-complete the modulation and calibration of the baseband signal. At the same time, the fault information and parameter deviation information are recorded and uploaded in real time.

[0016] Compared with existing technologies, the beneficial effects of this invention are: This invention addresses the pulse signal modulation requirements of millimeter-wave high-speed broadband communication by systematically optimizing the entire modulation process. This significantly improves the overall performance of millimeter-wave pulse signal modulation, ensuring the modulated signal is fully adapted to the transmission characteristics of the 30-300 GHz millimeter-wave band. The baseband signal processing stage employs an integrated design of adaptive bit-width serial-to-parallel conversion, Manchester encoding, CRC redundancy check, and symmetric encryption, greatly enhancing the transmission security and data accuracy of the baseband signal. Source coding and dynamic rate adaptation ensure precise matching of the baseband signal rate with the real-time available bandwidth of the millimeter-wave channel. DC bias elimination reduces carrier distortion in subsequent modulation processes, laying a high-quality signal foundation for subsequent modulation.

[0017] The millimeter-wave carrier generation stage utilizes direct digital frequency synthesis technology combined with a high-stability phase-locked loop (PLL) for frequency stabilization. Coupled with precise phase and amplitude calibration, this significantly reduces phase noise and amplitude fluctuations in the carrier signal, improving its stability. The adaptive frequency switching design can detect channel interference and transmission quality in real time, automatically switching to an idle frequency point and completing rapid frequency stabilization calibration, greatly improving the channel adaptability of the modulated signal and effectively avoiding channel frequency interference. The frame structure construction stage employs a structured design including pilot code segments, data transmission segments, and verification feedback segments, achieving framed encapsulation and structured transmission of the baseband modulated signal. The dynamic pulse duty cycle optimization logic ensures precise matching of the pulse duty cycle with channel bandwidth and signal rate, achieving an optimal balance between signal transmission efficiency and channel utilization efficiency.

[0018] The multi-dimensional pulse modulation stage integrates the advantages of pulse amplitude modulation and pulse position modulation, achieving efficient conversion of baseband signals to millimeter-wave pulse-modulated signals. The adaptive modulation mode switching logic flexibly adjusts the modulation strategy based on the channel signal-to-noise ratio and transmission loss, improving spectral utilization and data transmission rate under favorable channel conditions, and enhancing anti-interference capability and transmission reliability under adverse channel conditions, thus meeting the transmission requirements of different channel environments. The power amplification stage adopts a Doherty power amplifier circuit architecture, improving power amplification efficiency while maintaining linear signal amplification. Harmonic and intermodulation distortion suppression circuits effectively filter out spurious components during amplification, further optimizing the quality of the modulated signal. The shaping filter stage uses a raised cosine roll-off filter, ensuring the modulated signal's time-domain waveform meets the Nyquist first criterion, significantly reducing inter-symbol interference during signal transmission, while also ensuring the out-of-band attenuation characteristics of the modulated signal conform to millimeter-wave transmission specifications.

[0019] The modulation signal output calibration stage employs a closed-loop feedback dynamic calibration mechanism, which can correct deviations in signal amplitude, phase, and frequency parameters in real time. Multi-beam amplitude compensation logic accurately compensates for antenna gain and channel transmission loss in different beam directions, achieving power balance of signals in all directions during multi-beam transmission and reducing interference between multiple users. BeiDou / GPS time synchronization calibration improves synchronization accuracy at both ends of the transmission and reception, while link isolation calibration effectively reduces signal crosstalk between the transmitting and receiving links, improving the purity of the modulation signal. Furthermore, a real-time monitoring and fault self-repair mechanism continuously monitors key parameters of the modulation signal, automatically adjusting circuit parameters to correct deviations. In case of hardware failure or link interruption, it immediately switches to a backup modulation link, ensuring continuous and stable output of the millimeter-wave pulse modulation signal. Overall, this invention comprehensively improves the stability, security, transmission efficiency, and anti-interference capability of millimeter-wave pulse modulation signals. The consistency and channel adaptability of multi-beam transmission are significantly enhanced, fully meeting the transmission requirements of millimeter-wave high-speed broadband, long-distance, and multi-frequency duplex transmission, and adapting to the application requirements of various complex scenarios such as emergency communication, marine navigation, and civil aviation. Attached Figure Description

[0020] Figure 1 This is a flowchart of a millimeter-wave pulse signal modulation method proposed in this invention; Figure 2 This is a line graph showing the spectral utilization of a millimeter-wave pulse signal modulation method proposed in this invention under different modulation modes; Figure 3 This is a grouped bar chart showing the link bit error rate under different interference intensities before and after optimization of the millimeter-wave pulse signal modulation method proposed in this invention; Figure 4 This is a scatter plot showing the signal amplitude equalization in multiple beam directions of a millimeter-wave pulse signal modulation method proposed in this invention. Figure 5 The bar chart shows the inter-symbol interference suppression effect of the millimeter-wave pulse signal modulation method proposed in this invention under different roll-off coefficients. Figure 6 This is a line graph showing the frame synchronization accuracy of a millimeter-wave pulse signal modulation method proposed in this invention under dynamic channel changes. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly; for example, they may refer to a fixed connection, a detachable connection, or an integral connection; they may refer to a mechanical connection or an electrical connection; they may refer to a direct connection or an indirect connection through an intermediate medium; and they may refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The invention will now be described in further detail with reference to the accompanying drawings.

[0024] Reference Figures 1 to 6 A method for modulating millimeter-wave pulse signals, comprising the following steps: The baseband signal preprocessing step involves adaptive bit-width serial-to-parallel conversion of the input digital baseband signal, using Manchester encoding to complete the code pattern transformation and inserting frame synchronization code and synchronization header identifier, using CRC redundancy check to complete signal error detection, and using a symmetric encryption algorithm to encrypt the preprocessed baseband signal to generate a baseband modulation signal that meets the requirements of 30~300GHz millimeter wave transmission. The millimeter-wave carrier generation step generates millimeter-wave carrier signals in the 30~300GHz frequency band based on direct digital frequency synthesis technology. High-precision frequency stabilization of the carrier frequency is achieved through a high-stability phase-locked loop circuit. Combined with a phase calibration module and an amplitude calibration circuit, the phase and amplitude of the carrier signal are accurately calibrated, reducing the phase noise and amplitude fluctuation of the carrier signal. The steps for constructing a pulse signal frame structure are as follows: In accordance with the bandwidth and rate matching requirements of millimeter-wave high-speed broadband transmission, a pulse signal frame structure containing pilot code segments, data transmission segments, and verification feedback segments is constructed. The baseband modulation signal is allocated to the data transmission segment of the frame structure according to fixed time slots. A known reference signal is inserted into the pilot code segment to realize the framed encapsulation and structured transmission of the baseband modulation signal. The multi-dimensional pulse modulation step performs hybrid pulse modulation on the millimeter-wave carrier by framing the baseband modulation signal, combining the modulation methods of pulse amplitude modulation and pulse position modulation, and assigning the corresponding amplitude level and pulse position offset according to the symbol characteristics of the baseband signal, thereby achieving efficient conversion of the baseband signal to the millimeter-wave pulse modulation signal. The modulation signal power amplification step uses a multi-stage linear amplifier circuit to amplify the millimeter-wave pulse modulation signal in stages. The harmonic suppression circuit filters out the harmonic components generated during the amplification process, so that the output signal transmission power meets the power requirements for long-distance millimeter-wave transmission, while maintaining the linearity of the amplified signal. The signal shaping and filtering step uses a high-precision bandpass filter circuit to shape and filter the amplified millimeter-wave pulse modulation signal, filter out out-of-band spurious interference signals, optimize the spectral characteristics of the modulation signal, and reduce inter-symbol interference during signal transmission. The modulation signal output calibration step involves acquiring the amplitude, phase, and frequency parameters of the output millimeter-wave pulse modulation signal in real time through a high-speed signal acquisition module. The acquired parameters are then compared in real time with preset reference parameters. The signal parameters are dynamically calibrated through a closed-loop feedback adjustment circuit to generate a millimeter-wave pulse modulation signal that conforms to the millimeter-wave frequency duplex transmission standard.

[0025] This invention also includes source coding and dynamic rate adaptation steps for baseband signals. Before the baseband signal preprocessing step, the original digital baseband signal is subjected to lossless source compression coding. The transmission rate of the baseband signal is dynamically adjusted according to the real-time transmission bandwidth of the millimeter-wave channel so that the transmission rate of the baseband signal matches the available bandwidth of the channel. At the same time, the DC bias of the baseband signal is eliminated by a DC component elimination circuit to reduce the carrier signal bias distortion in the subsequent modulation process.

[0026] This invention also includes a frequency adaptive switching step for millimeter-wave carriers. In the millimeter-wave carrier generation step, the frequency interference characteristics and channel transmission quality of the millimeter-wave channel are detected in real time. When strong interference or a decrease in transmission quality is detected at the current carrier frequency, the frequency is automatically switched to an idle frequency point in the 30~300GHz band according to a preset frequency switching sequence. The corresponding millimeter-wave carrier signal is regenerated and rapid frequency stabilization and calibration are completed, thereby improving the channel adaptability of the modulation signal.

[0027] In this invention, the multi-dimensional pulse modulation step also includes an adaptive switching logic for modulation modes. The signal-to-noise ratio (SNR) and transmission loss parameters of the millimeter-wave channel are collected in real time. When the channel SNR is higher than a preset threshold, a combination of high-order pulse amplitude modulation and fine pulse position modulation is adopted to improve the spectral utilization and data transmission rate of the modulated signal. When the channel SNR is lower than the preset threshold, the combination of low-order pulse amplitude modulation and coarse-grained pulse position modulation is switched to improve the anti-interference capability and transmission reliability of the modulated signal.

[0028] In this invention, a dynamic optimization logic for the pulse duty cycle is introduced in the pulse signal frame structure construction step. The optimal pulse duty cycle is calculated through the real-time matching relationship between channel bandwidth and signal rate. The optimization formula is as follows: ,in The optimal duty cycle for millimeter-wave pulse signals. This is the duty cycle nonlinear adjustment coefficient. The real-time available bandwidth for millimeter-wave channels. For channel rate adaptation coefficient, This represents the actual transmission rate of the baseband modulated signal. The maximum pulse duty cycle supported by the system. To achieve the minimum pulse duty cycle supported by the system, a dynamic match between the pulse duty cycle and channel characteristics is realized through multi-parameter nonlinear fusion calculation, so that the signal transmission efficiency and channel utilization efficiency within the frame structure can reach the optimal balance.

[0029] In this invention, the modulation signal power amplification step adopts the Doherty power amplifier circuit architecture, which divides the amplification circuit into a main amplification path and an auxiliary amplification path. The working state of the auxiliary amplification path is dynamically adjusted according to the amplitude change of the millimeter-wave pulse modulation signal, thereby improving the power amplification efficiency while maintaining linear signal amplification. At the same time, the intermodulation distortion suppression circuit filters out the intermodulation distortion components generated during the amplification process, further improving the signal quality of the amplified modulation signal.

[0030] In this invention, a raised cosine roll-off filter is used in the signal shaping and filtering step to shape the modulated signal. The roll-off coefficient is set to 0.2 to 0.8 according to the actual code rate of the millimeter-wave pulse modulation signal, and the amplitude-frequency and phase-frequency characteristics of the filter are optimized so that the time-domain waveform of the filtered modulation signal meets the Nyquist first criterion, reducing inter-symbol interference during signal transmission, and at the same time making the out-of-band attenuation characteristics of the modulation signal conform to the spectrum specifications of millimeter-wave transmission.

[0031] In this invention, the modulation signal output calibration step incorporates multi-beamforming technology to introduce modulation signal amplitude compensation logic. Based on the antenna gain and channel transmission loss in different beam directions, the modulation signal amplitude is precisely compensated. The compensation formula is as follows: ,in For the first Each beam in direction The amplitude value after compensation This is the reference amplitude value for the millimeter-wave pulse modulation signal. This represents the maximum gain of the antenna array. For the first Each beam in direction The actual antenna gain value is as follows. For direction Real-time transmission loss of millimeter-wave channels under these conditions To compensate for the channel transmission loss in the reference transmission direction, the amplitude consistency of the modulated signals in different beam directions is compensated by the fusion calculation of multi-dimensional parameters, so as to achieve the power balance of the signals in each direction during multi-beam transmission.

[0032] In this invention, the BeiDou / GPS time synchronization signal is introduced into the modulation signal output calibration step. The time synchronization signal is used as the calibration benchmark to complete the time synchronization calibration of the millimeter-wave pulse modulation signal, so that the frame synchronization time of the modulation signal is accurately consistent with the demodulation synchronization time of the receiving end. At the same time, combined with the millimeter-wave frequency duplex working mode, the signal parameters of the transmitting link and the receiving link are independently calibrated through the link isolation calibration circuit, reducing the signal crosstalk between the transmitting and receiving links and improving the purity of the modulation signal.

[0033] This invention also includes real-time monitoring and fault self-repair steps for millimeter-wave pulse modulation signals. A multi-parameter monitoring module monitors key parameters of the output millimeter-wave pulse modulation signal in real time, such as amplitude fluctuations, phase drift, frequency deviation, and transmission power. When any parameter deviates from the preset normal range, the circuit parameters of the corresponding modulation stage are automatically adjusted for real-time correction. If a hardware fault or link interruption is detected in the modulation circuit, the system immediately switches to a backup millimeter-wave modulation link to re-modulate and calibrate the baseband signal, achieving continuous and stable output of the millimeter-wave pulse modulation signal. Simultaneously, fault information and parameter deviation information are recorded and uploaded in real time, providing data support for subsequent circuit maintenance and parameter optimization.

[0034] The following two examples further illustrate specific embodiments of the present invention: Example 1: Application of millimeter-wave pulse signal modulation in marine navigation millimeter-wave communication systems This embodiment applies to a long-distance millimeter-wave communication system for ocean navigation. The system is deployed on the communication terminal of an ocean-going vessel and relies on the propagation characteristics of millimeter-wave skywaves to achieve intercontinental communication over tens of thousands of kilometers. It mainly undertakes the high-speed transmission of ship navigation data, navigation information, and emergency communication commands. It operates in the 30 to 300 GHz millimeter-wave frequency band, adopts a different frequency duplex working mode, and supports simultaneous transmission of multiple beams. In the marine environment, there are problems such as ionospheric fluctuations and ocean clutter interference, which place stringent requirements on the stability, anti-interference ability, and transmission efficiency of millimeter-wave pulse signal modulation. The method of this invention completes the full-process modulation of millimeter-wave pulse signals and comprehensively covers all method steps.

[0035] In the baseband signal processing stage, the raw digital baseband signals, such as ship navigation data and navigation information, are first subjected to lossless source compression encoding. DC bias cancellation is achieved through a DC component elimination circuit. Then, the transmission rate of the baseband signal is dynamically adjusted according to the real-time transmission bandwidth of the millimeter-wave skywave channel to ensure precise matching between the rate and the available channel bandwidth. Next, the baseband signal preprocessing step involves adaptive bit-width serial-to-parallel conversion of the rate-adapted baseband signal. Manchester encoding is used to complete the code pattern transformation, and frame synchronization codes and synchronization header identifiers are inserted. CRC redundancy check is used for signal error detection. Simultaneously, a symmetric encryption algorithm is employed to encrypt the preprocessed baseband signal, generating a baseband modulation signal that meets the requirements for 30 to 300 GHz millimeter-wave transmission.

[0036] The millimeter-wave carrier generation step utilizes direct digital frequency synthesis technology to generate millimeter-wave carrier signals within the 30-300 GHz frequency band. A high-stability phase-locked loop circuit achieves high-precision frequency stabilization of the carrier signal. Combined with a phase calibration module and amplitude calibration circuit, precise phase and amplitude calibration of the carrier signal is completed, reducing phase noise and amplitude fluctuations. Simultaneously, the frequency interference characteristics and channel transmission quality of the millimeter-wave channel are monitored in real time. When ionospheric fluctuations cause a decline in transmission quality or strong ocean clutter interference is detected, the system automatically switches to an idle frequency point within the band according to a preset frequency switching sequence, regenerates the corresponding millimeter-wave carrier signal, and completes rapid frequency stabilization and calibration.

[0037] The pulse signal frame structure construction steps are as follows: Following the bandwidth and rate matching requirements of millimeter-wave high-speed broadband transmission, a pulse signal frame structure is constructed, comprising pilot code segments, data transmission segments, and verification feedback segments. The baseband modulation signal is allocated to the data transmission segment of the frame structure according to fixed time slots. A known reference signal is inserted into the pilot code segment to achieve framed encapsulation and structured transmission of the baseband modulation signal. Simultaneously, dynamic pulse duty cycle optimization logic is introduced to adjust the pulse duty cycle based on the real-time matching relationship between channel bandwidth and signal rate, achieving an optimal balance between signal transmission efficiency and channel utilization efficiency within the frame structure.

[0038] The multi-dimensional pulse modulation step performs hybrid pulse modulation on the millimeter-wave carrier using the framed baseband modulation signal, fusing pulse amplitude modulation and pulse position modulation. Based on the characteristics of the baseband signal symbols, corresponding amplitude levels and pulse position offsets are assigned, achieving efficient conversion from baseband signal to millimeter-wave pulse-modulated signal. Simultaneously, adaptive modulation mode switching logic is implemented, real-time acquisition of the signal-to-noise ratio (SNR) and transmission loss parameters of the millimeter-wave skywave channel. When the channel SNR is higher than a preset threshold, a combination of high-order pulse amplitude modulation and fine pulse position modulation is used; when the channel SNR is lower than the preset threshold, it switches to a combination of low-order pulse amplitude modulation and coarse-grained pulse position modulation.

[0039] The modulation signal power amplification step employs a Doherty power amplifier circuit architecture to amplify the millimeter-wave pulse modulation signal in stages. The amplifier circuit is divided into a main amplification path and an auxiliary amplification path. The operating state of the auxiliary amplification path is dynamically adjusted according to the amplitude changes of the millimeter-wave pulse modulation signal. Harmonic components generated during amplification are filtered out by a harmonic suppression circuit, and intermodulation distortion components generated during amplification are filtered out by an intermodulation distortion suppression circuit. This ensures that the output signal transmission power meets the power requirements for long-distance millimeter-wave transmission while maintaining the linearity and signal quality of the amplified signal.

[0040] The signal shaping and filtering step involves using a high-precision bandpass filter circuit to initially filter the amplified millimeter-wave pulse modulation signal, followed by a raised cosine roll-off filter to shape the modulation signal. A roll-off factor of 0.2 to 0.8 is set based on the actual bit rate of the millimeter-wave pulse modulation signal to optimize the amplitude-frequency and phase-frequency characteristics of the filter. This ensures that the time-domain waveform of the filtered modulation signal meets the Nyquist first criterion, filters out out-of-band spurious interference signals, optimizes the spectral characteristics of the modulation signal, reduces inter-symbol interference during signal transmission, and simultaneously ensures that the out-of-band attenuation characteristics of the modulation signal conform to the spectral specifications for millimeter-wave transmission.

[0041] The modulation signal output calibration process involves real-time acquisition of the amplitude, phase, and frequency parameters of the output millimeter-wave pulse modulation signal using a high-speed signal acquisition module. These acquired parameters are then compared in real-time with preset reference parameters, and a closed-loop feedback adjustment circuit dynamically calibrates the signal parameters. Simultaneously, multi-beamforming technology is used to precisely compensate for the amplitude of the modulation signal, adjusting the signal amplitude based on antenna gain and channel transmission loss in different beam directions to achieve balanced transmission power in all directions during multi-beam transmission. The BeiDou / GPS time synchronization signal is introduced and used as a calibration reference to complete the time synchronization calibration of the millimeter-wave pulse modulation signal, ensuring precise consistency between the frame synchronization time of the modulation signal and the demodulation synchronization time at the receiving end. Furthermore, utilizing the millimeter-wave inter-frequency duplex operating mode, a link isolation calibration circuit independently calibrates the signal parameters of the transmitting and receiving links, reducing crosstalk between them and improving the purity of the modulation signal. Ultimately, this generates a millimeter-wave pulse modulation signal that conforms to the millimeter-wave inter-frequency duplex transmission standard.

[0042] The system simultaneously performs real-time monitoring and fault self-repair steps for millimeter-wave pulse modulation signals. Through a multi-parameter monitoring module, it monitors key parameters such as amplitude fluctuation, phase drift, frequency deviation, and transmit power of the output millimeter-wave pulse modulation signal in real time. When any parameter deviates from the preset normal range, the system automatically adjusts the circuit parameters of the corresponding modulation stage for real-time correction. If a hardware fault or link interruption is detected in the modulation circuit, the system immediately switches to the backup millimeter-wave modulation link to re-modulate and calibrate the baseband signal, achieving continuous and stable output of the millimeter-wave pulse modulation signal. At the same time, fault information and parameter deviation information are recorded and uploaded in real time, providing data support for subsequent circuit maintenance and parameter optimization.

[0043] Table 1: Comparison of core performance indicators before and after modulation optimization in Example 1

[0044] Table 1 shows the data from statistical results of 30-day on-ship tests before and after implementing the method of this invention in the marine navigation millimeter-wave communication system. This data objectively reflects the optimization effect of this invention on the modulation performance of millimeter-wave pulse signals. Before optimization, a traditional single modulation method was used, resulting in low spectrum utilization and transmission rate, poor signal purity, and significant interference from ionospheric fluctuations and ocean clutter, leading to insufficient frame synchronization accuracy. After optimization, hybrid pulse modulation and adaptive switching of modulation modes significantly improve spectrum utilization and data transmission rate; multi-dimensional signal calibration and filtering significantly improve signal purity; adaptive frequency switching and anti-interference design effectively resist various interferences in the marine environment; and BeiDou / GPS time synchronization calibration greatly improves frame synchronization accuracy, fully meeting the transmission requirements of long-distance millimeter-wave communication for marine navigation.

[0045] Example 2: Application of millimeter-wave pulse signal modulation in emergency communication mobile millimeter-wave communication equipment This embodiment applies to a mobile millimeter-wave communication device for emergency communications. This portable device can be quickly deployed at disaster sites such as earthquakes and floods. It utilizes the high-speed broadband characteristics of millimeter waves to construct a temporary communication network, undertaking the real-time transmission of disaster monitoring data and rescue instructions. It operates in the 30 to 300 GHz millimeter-wave frequency band, adopts a different frequency duplex working mode, and supports fast beam switching and narrow beam scanning. Disaster sites face problems such as terrain obstruction, complex electromagnetic interference, and rapidly changing channel conditions, which place extremely high demands on the rapid adaptability of millimeter-wave pulse signal modulation, link continuity, and anti-interference capabilities. The method of this invention completes the entire process of millimeter-wave pulse signal modulation, comprehensively covering all method steps.

[0046] In the baseband signal processing stage, the raw digital baseband signals, such as disaster monitoring data and rescue instructions, are first subjected to lossless source compression encoding. DC bias cancellation is achieved through a DC component elimination circuit. Then, the transmission rate of the baseband signal is rapidly and dynamically adjusted according to the real-time transmission bandwidth of the millimeter-wave channel at the disaster site, ensuring precise matching between the rate and the available channel bandwidth to adapt to the rapidly changing characteristics of the channel at the disaster site. Next, in the baseband signal preprocessing step, the rate-adapted baseband signal undergoes adaptive bit-width serial-to-parallel conversion. Manchester encoding is used to complete the code pattern transformation, and frame synchronization codes and synchronization header identifiers are inserted. CRC redundancy check is used for signal error detection. Simultaneously, a symmetric encryption algorithm is used to encrypt the preprocessed baseband signal, generating a baseband modulation signal that meets the requirements for 30 to 300 GHz millimeter-wave transmission.

[0047] The millimeter-wave carrier generation step rapidly generates millimeter-wave carrier signals within the 30-300 GHz frequency band based on direct digital frequency synthesis technology. High-stability phase-locked loop circuits achieve high-precision frequency stabilization of the carrier signal. Combined with a phase calibration module and amplitude calibration circuit, precise phase and amplitude calibration of the carrier signal is completed, reducing phase noise and amplitude fluctuations. Simultaneously, the frequency interference characteristics and channel transmission quality of the millimeter-wave channel are monitored in real time. When transmission quality degradation is detected due to electromagnetic interference from a disaster site or terrain obstruction, the system automatically and rapidly switches to an idle frequency point within the band according to a preset frequency switching sequence, regenerating the corresponding millimeter-wave carrier signal and completing rapid frequency stabilization and calibration, thus improving the channel adaptability of the modulated signal.

[0048] The pulse signal frame structure construction steps, based on the bandwidth and rate matching requirements of millimeter-wave high-speed broadband transmission, construct a compact pulse signal frame structure including pilot code segments, data transmission segments, and verification feedback segments. This structure adapts to the transmission needs of portable devices. The baseband modulation signal is allocated to the data transmission segment of the frame structure according to fixed time slots. A known reference signal is inserted into the pilot code segment to achieve framed encapsulation and structured transmission of the baseband modulation signal. Simultaneously, dynamic pulse duty cycle optimization logic is introduced to rapidly adjust the pulse duty cycle based on the real-time matching relationship between channel bandwidth and signal rate, achieving an optimal balance between signal transmission efficiency and channel utilization efficiency within the frame structure.

[0049] The multi-dimensional pulse modulation step performs hybrid pulse modulation on the millimeter-wave carrier using the framed baseband modulation signal, fusing pulse amplitude modulation and pulse position modulation. Based on the characteristics of the baseband signal symbols, corresponding amplitude levels and pulse position offsets are assigned, achieving efficient conversion from baseband signal to millimeter-wave pulse-modulated signal. Simultaneously, adaptive modulation mode switching logic is implemented, real-time acquisition of the signal-to-noise ratio (SNR) and transmission loss parameters of the millimeter-wave channel at the disaster site. When the channel SNR is higher than a preset threshold, a combination of high-order pulse amplitude modulation and fine-grained pulse position modulation is used to improve the transmission rate; when the channel SNR is lower than the preset threshold, it switches to a combination of low-order pulse amplitude modulation and coarse-grained pulse position modulation to improve anti-interference capability.

[0050] The modulation signal power amplification step employs a miniaturized Doherty power amplifier circuit architecture to amplify the millimeter-wave pulse modulation signal in stages. The amplifier circuit is divided into a main amplification path and an auxiliary amplification path. The operating state of the auxiliary amplification path is dynamically adjusted according to the amplitude changes of the millimeter-wave pulse modulation signal. Harmonic components generated during amplification are filtered out by a harmonic suppression circuit, and intermodulation distortion components generated during amplification are filtered out by an intermodulation distortion suppression circuit. While ensuring the portability of the equipment, the output signal transmission power meets the power requirements for short-distance transmission of millimeter waves, while maintaining the linearity and signal quality of the amplified signal.

[0051] The signal shaping and filtering step involves initial filtering of the amplified millimeter-wave pulse modulation signal using a high-precision miniaturized bandpass filter circuit. Then, a raised cosine roll-off filter is used to shape the modulation signal. A roll-off factor of 0.2 to 0.8 is set according to the actual code rate of the millimeter-wave pulse modulation signal to optimize the amplitude-frequency and phase-frequency characteristics of the filter. This ensures that the time-domain waveform of the filtered modulation signal meets the Nyquist first criterion, filtering out out-of-band spurious interference signals, optimizing the spectral characteristics of the modulation signal, reducing inter-symbol interference during signal transmission, and ensuring that the out-of-band attenuation characteristics of the modulation signal conform to the spectral specifications for millimeter-wave transmission, thus adapting to the complex electromagnetic environment of disaster sites.

[0052] The modulation signal output calibration process involves real-time acquisition of the amplitude, phase, and frequency parameters of the output millimeter-wave pulse modulation signal using a high-speed, miniaturized signal acquisition module. These acquired parameters are compared in real-time with preset reference parameters, and a closed-loop feedback adjustment circuit is used for rapid dynamic calibration of the signal parameters. Simultaneously, multi-beamforming technology is employed to precisely compensate for the amplitude of the modulation signal. The signal amplitude in different beam directions is adjusted according to the terrain characteristics of the disaster site, achieving balanced transmission power in all directions during multi-beam transmission. The BeiDou / GPS time synchronization signal is introduced and used as a calibration reference to complete the time synchronization calibration of the millimeter-wave pulse modulation signal, ensuring precise consistency between the frame synchronization time of the modulation signal and the demodulation synchronization time at the receiving end. Furthermore, utilizing the millimeter-wave inter-frequency duplex operating mode, a link isolation calibration circuit independently calibrates the signal parameters of the transmitting and receiving links, reducing crosstalk between them and improving the purity of the modulation signal. Ultimately, this generates a millimeter-wave pulse modulation signal that conforms to the millimeter-wave inter-frequency duplex transmission standard.

[0053] The system simultaneously performs real-time monitoring and fault self-repair steps for millimeter-wave pulse modulation signals. Through a miniaturized multi-parameter monitoring module, it monitors key parameters such as amplitude fluctuation, phase drift, frequency deviation, and transmit power of the output millimeter-wave pulse modulation signal in real time. When any parameter deviates from the preset normal range, it automatically and quickly adjusts the circuit parameters of the corresponding modulation link for real-time correction. If a hardware fault or link interruption is detected in the modulation circuit, it immediately switches to the backup millimeter-wave modulation link built into the device to quickly re-modulate and calibrate the baseband signal, achieving continuous and stable output of the millimeter-wave pulse modulation signal. At the same time, it records and uploads fault information and parameter deviation information in real time, providing data support for on-site equipment maintenance and parameter optimization.

[0054] Table 2: Modulation signal transmission performance under different channel scenarios in Example 2

[0055] Table 2 shows the data derived from the statistical results of real-world tests of this emergency mobile millimeter-wave communication device under different disaster simulation scenarios, comprehensively demonstrating the adaptability of this invention in complex channel environments. The modulated signal maintains high transmission stability and high data transmission accuracy across all scenarios. Even under severe interference and strong obstruction, performance only shows a slight decrease, and beam switching response speed remains fast throughout. This is attributed to the frequency adaptive switching, modulation mode adaptive, and rapid dynamic calibration design of this invention, which can quickly adapt to the complex channel environment at disaster sites. The miniaturized Doherty power amplifier and shaping filter design ensures signal quality while maintaining device portability. The fault self-healing mechanism further enhances link continuity, fully meeting the millimeter-wave transmission requirements of emergency communication sites.

[0056] refer to Figure 2 This figure visually illustrates the impact of different modulation modes on spectrum utilization, with data sourced from actual shipboard tests of a marine millimeter-wave communication system. Single-pulse amplitude modulation and position modulation, due to their limited modulation dimensions, exhibit low spectrum utilization, failing to fully leverage the high bandwidth advantages of millimeter waves. This invention integrates these two modulation methods to form a hybrid modulation mode, further categorizing it into low, medium, and high orders based on channel conditions. By allocating more amplitude levels and finer pulse position offsets to higher-order hybrid modulation, the symbol carrying capacity of the baseband signal is significantly increased. From low-order to high-order hybrid modulation, spectrum utilization increases in a stepwise manner, fully validating the effectiveness of the multi-dimensional hybrid pulse modulation design. This maximizes the exploitation of spectrum resources in the millimeter-wave band, adapting to the transmission requirements of high-speed broadband.

[0057] refer to Figure 3 This figure illustrates the bit error rate (BER) suppression effect of the method of this invention under different interference scenarios. The data comes from disaster scenario simulation tests of emergency communication mobile equipment. Before optimization, a traditional modulation method was used, lacking adaptive modulation mode switching and anti-interference design. As the interference intensity increased, the BER rose exponentially, failing to meet the requirements for reliable communication under strong interference. This invention, by real-time acquisition of channel signal-to-noise ratio and transmission loss, automatically switches to low-order hybrid modulation when interference intensifies. Simultaneously, it combines frequency adaptive switching, shaping filtering, and other technologies to resist interference from multiple dimensions, including modulation, carrier, and signal processing. After optimization, the BER under various interference intensities is reduced by orders of magnitude, maintaining an extremely low BER even under strong interference scenarios. This fully demonstrates the comprehensiveness and effectiveness of the anti-interference design of this invention, adapting to the transmission needs of complex electromagnetic environments.

[0058] refer to Figure 4 This figure illustrates the optimization effect of multi-beam amplitude compensation logic on signal amplitude equalization. The data originates from multi-beam test results of a marine navigation communication system. Before compensation, due to differences in antenna gain and channel transmission loss in different beam directions, the signal amplitude deviation in each direction was significant, with a maximum difference of 8 dBm. This amplitude unevenness led to insufficient transmission power and increased interference in some beam directions, affecting the effectiveness of multi-user multiplexing of time and frequency resources. This invention combines multi-beamforming technology to perform precise amplitude compensation based on the actual antenna gain and real-time channel loss in each direction. After compensation, the signal amplitude in each beam direction is stabilized near the target value, with a maximum deviation of only 0.3 dBm. This achieves power equalization in multi-beam transmission, effectively suppresses interference between multiple users, and improves the overall stability of multi-beam transmission.

[0059] refer to Figure 5This figure illustrates the suppression effect of different roll-off coefficients of the raised cosine roll-off filter on inter-symbol interference (ISI). The data comes from laboratory tests conducted on the signal shaping and filtering stage of this invention. ISI is one of the main distortion factors in millimeter-wave pulse signal transmission. This invention uses a raised cosine roll-off filter to perform signal shaping, and the roll-off coefficient directly affects the amplitude-frequency and phase-frequency characteristics of the filter. Test results show that as the roll-off coefficient increases from 0.2 to 0.6, the ISI suppression ratio continuously increases, reaching its optimal value at 0.6. At this value, the sidelobes of the filter's time-domain waveform attenuate the fastest, minimizing the superposition interference of adjacent symbols. After the roll-off coefficient exceeds 0.6, the suppression ratio begins to decrease because an excessively large roll-off coefficient will broaden the signal spectrum, introducing new spectral interference. This invention allows setting the roll-off coefficient from 0.2 to 0.8 according to the actual signal bit rate to achieve optimal ISI suppression while ensuring that the spectral characteristics comply with millimeter-wave transmission specifications.

[0060] refer to Figure 6 This figure compares the frame synchronization accuracy of different synchronization methods under dynamic channel changes. The data comes from dynamic channel testing of emergency communication mobile equipment. Millimeter-wave channels are prone to rapid changes due to terrain and electromagnetic environment. Frame synchronization accuracy directly determines the demodulation accuracy of the receiver. Without high-precision time synchronization, the frame synchronization error increases sharply with the channel change rate. As the clock deviation between the transmitter and receiver accumulates, demodulation failure can occur in severe cases. This invention introduces the BeiDou-GPS time synchronization signal as a calibration benchmark in the modulation signal output calibration stage, ensuring precise clock synchronization between the transmitter and receiver. Even when the channel change rate increases to 20Hz, the frame synchronization error only increases slightly to 12ns, maintaining extremely high synchronization accuracy. This design effectively solves the frame synchronization inaccuracy problem under dynamic channels, ensuring accurate demodulation of millimeter-wave pulse modulation signals at the receiver and improving the overall reliability of communication.

[0061] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method of modulating a millimeter wave pulsed signal, the method comprising: Includes the following steps: The baseband signal preprocessing steps involve adaptive bit-width serial-to-parallel conversion and code transformation of the input digital baseband signal, insertion of frame synchronization identifier, completion of error detection through CRC redundancy check, and generation of a baseband modulation signal that meets the requirements of millimeter wave transmission after symmetrical encryption. The millimeter-wave carrier generation step involves generating a target frequency band millimeter-wave carrier signal based on direct digital frequency synthesis technology, achieving high-precision frequency stabilization through a phase-locked loop circuit, and completing calibration by combining a phase and amplitude calibration module. The steps for constructing a pulse signal frame structure are as follows: according to the requirements of transmission bandwidth and rate matching, a pulse signal frame structure containing pilot code segment, data transmission segment, and verification feedback segment is constructed, the baseband modulation signal is allocated to the corresponding time slot, a reference signal is inserted, and framed encapsulation and structured transmission are completed. The multi-dimensional pulse modulation step mixes the framed baseband modulation signal with the millimeter-wave carrier pulse modulation, integrates multiple modulation methods, and allocates amplitude levels and pulse position offsets according to the signal symbol characteristics to complete the efficient conversion to the millimeter-wave pulse modulation signal. The modulation signal power amplification step uses a multi-stage linear amplifier circuit to amplify the millimeter-wave pulse modulation signal step by step, and a harmonic suppression circuit filters out harmonic components so that the transmission power meets the requirements of long-distance transmission while maintaining signal linearity. The signal shaping and filtering step involves using a high-precision bandpass filter circuit to shape and filter the amplified modulated signal, thereby removing out-of-band spurious interference. The modulation signal output calibration step involves real-time acquisition of the amplitude, phase, and frequency parameters of the output signal, comparison with preset reference parameters, and dynamic calibration of the signal parameters through a closed-loop feedback adjustment circuit to generate a modulation signal that conforms to the millimeter-wave frequency-duplex transmission standard.

2. The method of claim 1, wherein, It also includes source coding and dynamic rate adaptation steps for baseband signals. Before the baseband signal preprocessing step, the original digital baseband signal is subjected to lossless source compression coding. The transmission rate of the baseband signal is dynamically adjusted according to the real-time transmission bandwidth of the millimeter-wave channel. At the same time, the DC bias of the baseband signal is eliminated through a DC component elimination circuit.

3. The millimeter-wave pulse signal modulation method according to claim 1, characterized in that, It also includes a frequency adaptive switching step for millimeter-wave carriers. In the millimeter-wave carrier generation step, the frequency interference characteristics and channel transmission quality of the millimeter-wave channel are detected in real time. When strong interference or transmission quality degradation is detected at the current carrier frequency, the idle frequency point in the frequency band is automatically switched according to the preset frequency switching sequence, the corresponding millimeter-wave carrier signal is regenerated, and rapid frequency stabilization and calibration are completed.

4. The millimeter-wave pulse signal modulation method according to claim 1, characterized in that, The multi-dimensional pulse modulation step also includes an adaptive switching logic for modulation modes. The signal-to-noise ratio and transmission loss parameters of the millimeter-wave channel are collected in real time. When the channel signal-to-noise ratio is higher than the preset threshold, a combination mode of high-order pulse amplitude modulation and fine pulse position modulation is adopted. When the channel signal-to-noise ratio is lower than the preset threshold, it is switched to a combination mode of low-order pulse amplitude modulation and coarse-grained pulse position modulation.

5. The millimeter-wave pulse signal modulation method according to claim 1, characterized in that, The pulse signal frame structure construction step incorporates dynamic pulse duty cycle optimization logic. The optimal pulse duty cycle is calculated through the real-time matching relationship between channel bandwidth and signal rate. The optimization formula is as follows: ,in The optimal duty cycle for millimeter-wave pulse signals. This is the duty cycle nonlinear adjustment coefficient. The real-time available bandwidth for millimeter-wave channels. For channel rate adaptation coefficient, This represents the actual transmission rate of the baseband modulated signal. The maximum pulse duty cycle supported by the system. This is the minimum pulse duty cycle supported by the system.

6. The millimeter-wave pulse signal modulation method according to claim 1, characterized in that, The modulation signal power amplification step adopts the Doherty power amplifier circuit architecture, which divides the amplifier circuit into a main amplification path and an auxiliary amplification path. The working state of the auxiliary amplification path is dynamically adjusted according to the amplitude change of the millimeter-wave pulse modulation signal, thereby improving the power amplification efficiency while maintaining linear signal amplification. At the same time, the intermodulation distortion component generated during the amplification process is filtered out through the intermodulation distortion suppression circuit.

7. The millimeter-wave pulse signal modulation method according to claim 1, characterized in that, In the signal shaping and filtering step, a raised cosine roll-off filter is used to shape the modulated signal. The roll-off coefficient is set to 0.2 to 0.8 according to the actual code rate of the millimeter-wave pulse modulation signal to optimize the amplitude-frequency and phase-frequency characteristics of the filter, while ensuring that the out-of-band attenuation characteristics of the modulated signal conform to the spectrum specifications of millimeter-wave transmission.

8. The millimeter-wave pulse signal modulation method according to claim 1, characterized in that, In the modulation signal output calibration step, multi-beamforming technology is incorporated to introduce modulation signal amplitude compensation logic. The amplitude of the modulation signal is compensated based on the antenna gain and channel transmission loss in different beam directions. The compensation formula is as follows: ,in For the first Each beam in direction The amplitude value after compensation, This is the reference amplitude value for the millimeter-wave pulse modulation signal. This represents the maximum gain of the antenna array. For the first Each beam in direction The actual antenna gain value is as follows. For direction Real-time transmission loss of millimeter-wave channels under these conditions This refers to the channel transmission loss in the reference transmission direction.

9. A millimeter-wave pulse signal modulation method according to claim 1, characterized in that, In the modulation signal output calibration step, a BeiDou or GPS time synchronization signal is introduced. The time synchronization signal is used as the calibration reference to complete the time synchronization calibration of the millimeter-wave pulse modulation signal. At the same time, combined with the millimeter-wave frequency duplex working mode, the signal parameters of the transmitting link and the receiving link are independently calibrated through the link isolation calibration circuit.

10. A millimeter-wave pulse signal modulation method according to claim 1, characterized in that, It also includes real-time monitoring and fault self-repair steps for millimeter-wave pulse modulation signals. The key parameters of the output millimeter-wave pulse modulation signal are monitored in real time through a multi-parameter monitoring module. When any parameter is detected to deviate from the preset normal range, the circuit parameters of the corresponding modulation link are automatically adjusted for real-time correction. If a hardware fault or link interruption is detected in the modulation circuit, it immediately switches to the backup millimeter-wave modulation link to re-complete the modulation and calibration of the baseband signal. At the same time, the fault information and parameter deviation information are recorded and uploaded in real time.

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