94 results about "Modulation demodulation" patented technology

A spatial adaptive multi-user service modulation and demodulation method suitable for various channel environments is characterized in that an uplink channel is configured with multiple paths of general carriers and multiple paths of helicopter special carriers in a frequency division mode, and the general carriers support uplink adaptive information transmission of terminals of various types and sizes in an MF-TDMA (Multimedia Frequency-Time Division Multiple Access) system; the on-satellite demodulator obtains a modulation coding mode of a burst data segment by identifying mode word information in a physical layer frame header, and demodulates a corresponding mode; the carrier special for the helicopter uses a continuous carrier mode, and multi-rate channel error correction coding and decoding under rotor wing shielding are supported in a channel interleaving mode. Downlink transmission is carried out in a fixed time slot and free time slot time division mode, and downlink information transmission for universal multi-type terminals and helicopter terminals can be supported at the same time. Compared with a common spatial modulation and demodulation method, the modulation and demodulation scheme provided by the invention can support adaptive transmission of general services of multiple types of terminals and helicopter service information on both an uplink and a downlink by using one satellite-borne modem.

The invention provides a dynamic monitoring system and method for a submarine optical cable array reservoir, which is applied to the technical field of marine geophysical prospecting, and comprises a wet-end subsystem positioned underwater and a dry-end subsystem positioned on a base bank, the dry end subsystem comprises a light source module used for generating an optical signal; the modulation transmitting module is used for modulating the optical signal to obtain modulated pulse light; the underwater wet end subsystem comprises an optical cable transmission module used for transmitting modulation pulse light; the optical fiber four-component node module is used for dynamically and continuously monitoring the reservoir for a long time, and modulating the acquired sound pressure signal and the triaxial vibration signal onto the modulated pulse light in response to the received modulated pulse light to form a return light signal; the dry end subsystem further comprises a modulation-demodulation module used for receiving the return optical signal and demodulating the return optical signal to obtain four-component monitoring data. According to the invention, sound pressure and three-axis vibration response can be integrated on the same node, and passive four-component synchronous acquisition is realized.

The application discloses a kind of time division multiplexing three-axis wide spectrum light source resonant type fiber-optic gyroscope detection systems and methods, belong to gyroscope optical system design field.System is constituted by optical system and signal detection system, and optical system includes a wide spectrum light source, a push-pull Y waveguide, a circulator, three mutually orthogonal transmission type fiber ring resonant cavity, two sections of delay optical fiber and a photoelectric detector;Signal detection system includes modulation and demodulation module, time division decoupling module and low-pass filter module.Three transmission type fiber ring resonant cavities are sequentially connected, and the time of optical signal reaching three fiber ring resonant cavities is different by being set delay optical fiber between adjacent two transmission type fiber ring resonant cavities.The application ingeniously designs three fiber ring resonant cavities to form three-axis integrated structure.In this way, the time difference of three-axis signals is utilized, and multiplexing in time domain can be realized without adding additional devices.

Disclosed is a fiber-wireless hybrid sensor network deployment method based on an annealing algorithm. In the method, a plurality of fiber sensing tips, a plurality of modulation and demodulation nodes, and a wireless gateway construct a fiber-wireless hybrid sensor network architecture. The fiber sensing tips are directly connected to the modulation and demodulation nodes by overhead optical fibers. The modulation and demodulation nodes modulate and demodulate the optical signals in the plurality of fiber sensing tips connected thereto to convert the optical signals collected by the fiber sensing tips into electrical signals, and transmit the processed electrical signals to the wireless gateway by wireless means. The number of enumerated modulation and demodulation nodes is N S Next, the deployment scheme of the modulation and demodulation nodes is optimized to obtain the optimal deployment scheme of the modulation and demodulation nodes by taking the minimum value of the scheme cost function as the target by using the simulated annealing algorithm, and the fiber-wireless hybrid sensor network architecture is deployed.

The invention discloses a no-cable communication system based on a photon integrated phased array, and the system comprises a plurality of symmetrical double-end receiving and transmitting communication systems, a modulation and demodulation module in a local end emits a modulation optical signal, and the modulation optical signal passes through a light transmitting antenna of the local end for multi-beam transmission; the optical receiving antenna at the opposite end receives an optical signal transmitted by the local end; the corresponding optical fiber beam splitter performs energy splitting on the received optical signal, one part of light is used for bidirectional closed-loop tracking control, and the rest of light enters the corresponding modulation and demodulation module; the modulation-demodulation module at the opposite end emits a modulated optical signal, and the modulated optical signal passes through the optical emission antenna at the opposite end to perform multi-beam emission; and the optical receiving antenna of the home terminal receives the optical signal transmitted by the opposite terminal so as to establish a bidirectional full-duplex communication link. According to the invention, rapid and agile beam control and simultaneous multi-beam transceiving are realized, and the application requirements of near-field cableless multi-link parallel communication are met.

The invention relates to the technical field of oil-gas exploration logging, provides a logging work data real-time transmission system and method based on an embedded structure, and aims to solve the problems that in the prior art, data transmission is insufficient in real-time performance, a logging system is difficult to troubleshoot, and the data transmission efficiency is low. And the technical problem that the ground decoding board only supports cable communication of a single modulation mode is solved. Comprising a downhole instrument used for collecting original logging electric signals; the mode transformer is used for performing impedance matching processing on the original logging electric signal to obtain a preprocessed logging signal; the amplifier module is used for performing method processing on the preprocessed logging signal to obtain an amplified logging signal; the A / D conversion module is used for converting the amplified logging signal into a digital signal from an analog signal to obtain a digital logging signal; the modulation-demodulation module is used for decoding the digital logging signal to obtain a decoded logging signal; and the network communication module is used for uploading the decoded logging signal to logging acquisition software of an upper computer in real time.

This invention discloses a polarization state modulation method based on regular polyhedral constellation points, comprising: selecting the order of polarization modulation and the corresponding regular polyhedral class; dividing the original binary bitstream into a conventional modulation bitstream and a polarization state modulation bitstream, wherein the conventional modulation bitstream is used to generate conventional modulation symbols, and the polarization state modulation bitstream is used for polarization state mapping; obtaining the corresponding polarization state description parameters using the polarization state modulation bitstream and the order of polarization modulation, determining the polarization weighting factor and performing polarization weighted fusion to obtain dual-channel high-dimensional modulation symbols to be transmitted; transmitting the symbols through an orthogonal dual-polarization antenna after preprocessing; performing RF front-end processing on the received horizontal and vertical polarization components of the RF signal at the receiving end to obtain the Jones vector representation of the baseband received signal; recovering the polarization state information by combining the Stokes parameters, and recovering the original binary bitstream by combining the conventional modulation and demodulation results.

Transfer learning (TL)-based systems, methods, and devices are provided for neural network and / or neuromorphic network transmitters / receivers with a set of desired modulation orders. In one aspect, a source system trains a full neural net modulation / demodulation model, from which one or more upper / output layers are removed, and the remaining base layers are transferred into a target system. A set of one or more upper / output layers are generated for the set of desired modulation orders, then transferred into, and trained in, the target system. The target system may store the transferred base layers and the trained set of one or more upper / output layers for the set of desired modulation orders, and use them to modulate / demodulate any transmission having one of the set of desired modulation orders.

The invention discloses an underwater mooring system unmooring device based on wireless simultaneous transmission of energy and information, and the device takes an anchor chain as a power supply lead and a signal carrier, and achieves mechanical connection through a butt joint locking device; and meanwhile, an energy and information simultaneous transmission module (comprising a transmitting / receiving coil and a modulation-demodulation circuit) is embedded in the locking device, and cross-interface energy and information synchronous transmission is completed by utilizing a shared channel. According to the structure, the sealing problem of traditional wet plugging is avoided, the robustness of a system under dynamic loads and complex media is remarkably improved by decoupling mechanical connection and electrical connection, and key technical support is provided for long-term autonomous operation of underwater equipment.

The application discloses an enhanced twisted copper line transmission system and an implementation method thereof, which comprises an FPGA and an analog front end matched with the FPGA, the FPGA is configured to comprise a framing / de-framing unit, which is connected with network equipment at a public network or a local area network end through an interface unit; a digital front end unit connected with the analog front end, used for realizing PAM and CAP modulation and demodulation; a SOC subsystem connected with the framing / de-framing unit and the digital front end unit respectively, used for completing link building and state management; and the SOC subsystem adopts an embedded kernel, and a UART serial port of the embedded kernel is a management channel under SDSL technology and SHDSL technology. The application provides an enhanced twisted copper line transmission system and an implementation method thereof, adopts a channel compatibility and algorithm function module multiplexing method, supports two transmission technologies of SDSL and SHDSL, adopts a spread spectrum method, breaks through the limitation of an ITU-G.991.2 SHDSL standard, makes the highest transmission rate not less than 20480 kbit / s, and meets the application requirements of low-speed long-distance and short-distance high-bandwidth of users.

The application discloses a kind of energy collection GFSK modulation and demodulation wireless transceiver, it is characterized in that, including GFSK demodulator, GFSK modulator, power supply management module, internal control module, radio frequency energy collection module;The GFSK demodulator is connected with transceiving antenna by low-noise amplifier, the GFSK modulator is connected with transceiving antenna by radio frequency power amplifier;The internal control module is connected with GFSK demodulator, GFSK modulator, the GFSK demodulator is used to demodulate received wireless signal, the GFSK modulator is used to modulate the wireless signal that emits;Wherein, the radio frequency energy collection module connects power supply management module, the radio frequency energy collection module is converted into electric energy by energy collection antenna and collects radio frequency energy, and the power supply management module is used to manage the electric energy that radio frequency energy collection module exports and is powered for wireless transceiver.

The invention discloses a dual-beam millimeter wave satellite communication phased-array antenna device and a communication system. The device comprises a dual-beam transmitting module, a dual-beam receiving module, a frequency conversion module, a positioning and attitude determining module, an antenna control module and a structural assembly. The system comprises a dual-mode satellite modulation and demodulation module, a baseband processing and routing module and a user terminal interface module. According to the phased-array antenna, an electronic scanning system is adopted, the problem that a traditional mechanical phased-array antenna is low in tracking speed is solved, and the reliability of the phased-array antenna is greatly improved; meanwhile, the dual-beam design is adopted, two satellite networks can be accessed at the same time, real-time switching between the two satellite networks is achieved, uninterrupted satellite communication is achieved, and the communication reliability is greatly improved.

The invention relates to the technical field of laser interference ranging, and discloses a laser interference displacement sensor transfer function evaluation method and system, and the method comprises the steps: generating a candidate parameter combination set which is composed of a plurality of candidate parameter combinations; for each candidate parameter combination, a corresponding transfer function is obtained, and the transfer function is a mapping relation between a normalized harmonic intensity ratio and a phase; calculating an evaluation coefficient of each candidate parameter combination, wherein the evaluation coefficient is obtained through calculation according to a first-order derivative of the transfer function; and based on the evaluation coefficients, selecting a candidate parameter combination with the highest evaluation coefficient from the candidate parameter combination set as an optimal parameter combination. According to the method, automatic and quantitative optimization of modulation and demodulation parameters is realized, blindness and instability of selection depending on experience are overcome, and consistency and replicability of sensor performance are remarkably improved.

The utility model provides a wireless control circuit and a thrower adaptive to a heavy-load lifting unmanned aerial vehicle, and relates to the technical field of unmanned aerial vehicle control, the wireless control circuit comprises a power supply circuit, a main control chip, a radio frequency module, a communication module, a frequency matching key module and a gravity detection module; the radio frequency module is connected with the main control chip and is configured to transmit and receive wireless signals and perform modulation and demodulation, frequency band switching, frequency conversion or signal amplification and filtering; the communication module is connected with the main control chip and the radio frequency module and is configured to process a signal output by the radio frequency module based on a control instruction of the main control chip so as to realize data interaction and network access among different devices; and the frequency matching key module is configured to establish wireless communication connection among different devices based on the control instruction of the main control chip. Through cooperative work of the radio frequency module and the communication module, real-time wireless control over the heavy-load lifting unmanned aerial vehicle is achieved, accurate operation of the throwing device is ensured, and the risk of goods falling is reduced.

The embodiment of the present disclosure relates to a low-complexity LDPC-Hadamard code encoding and decoding method under OTFS modulation, which comprises the following steps: the sending end adds check information to an information sequence through cyclic redundancy check, encodes the information sequence through LDPC-Hadamard code, and performs inverse symplectic finite Fourier transform and Heisenberg transform on complex value symbols after constellation mapping to output time domain signals; the time domain signals generate sending signals after time delay and Doppler shift through a multipath time-varying channel; the receiving end performs Wigner transform and symplectic Fourier transform on the received sending signals to output a symbol matrix; the received bit stream is processed through LDPC-Hadamard decoding, check information is removed through cyclic redundancy check, and the original bit stream is output. Through LDPC-Hadamard encoding and decoding and OTFS modulation and demodulation, the double-selectivity fading channel in a high-speed mobile scene can be better coped with; through the combination of LDPC-Hadamard code and OTFS, the error correction performance of the system under low signal-to-noise ratio is improved, the reliability of the system in a high-speed mobile environment is enhanced, and the error code performance of the OTFS system under low signal-to-noise ratio is improved.

The invention discloses a pedestrian path gate, a passing detection method, device and equipment thereof and a medium. The pedestrian passageway gate comprises a first gate machine and a second gate machine which are oppositely arranged, and a passage is formed between the first gate machine and the second gate machine. The first gate is provided with a plurality of infrared emission gratings and a modulator, each infrared emission grating is provided with a plurality of infrared emission tubes which are distributed at intervals along the passing direction and / or the height direction and are cascaded in sequence, and the modulator modulates an infrared light signal into a 33kHz infrared light pulse signal. The second gate is provided with a plurality of infrared receiving gratings and a demodulator, each infrared receiving grating is provided with a plurality of infrared receiving tubes, the infrared receiving tubes are correspondingly distributed at intervals and are sequentially cascaded, and the demodulator only receives 33 kHz infrared light pulse signals. The circuit board is arranged on the first gate and / or the second gate and is only connected with the primary transmitting grating and the primary receiving grating. Wiring is simplified through grating cascading, cable loss is reduced, outdoor interference is filtered in combination with 33kHz fixed-frequency modulation and demodulation, the reliability and anti-interference capacity of outdoor use of the gate are improved, and the gate meets the outdoor scene requirement.

This invention relates to the field of optical resonator locking technology, and discloses a modulation-free optical resonator locking method and apparatus based on optical field spatial mode mismatch, aiming to solve the problems of complexity and noise introduction in traditional PDH locking technology systems. This method uses the superposition field of the spatial fundamental mode and the second-order transverse mode excited by mode mismatch as the input light field of the optical cavity. After breaking the mode orthogonality through pinhole clipping, the reflected light is split and a controllable Gouy phase shift is introduced. Two photodetectors detect the signals and differentially process them to generate an error signal, thus achieving optical resonator locking. This invention requires no external modulation and demodulation components, has a simple structure, high stability, and locking effect comparable to traditional PDH methods. It has low requirements for spot centering and partition consistency, providing a simple and effective way to achieve cavity frequency stabilization in precision optical systems, and is suitable for fields such as laser frequency stabilization and precision measurement.

Provided is a traffic pattern adaptive modem (modulator-demodulator) gear control method for an electronic device. The traffic pattern adaptive modem (modulator-demodulator) gear control method includes: when a first criteria is met, on-line collecting a period of input data; executing traffic prediction; whether a second criteria is met to apply the traffic prediction is determined; when the second criteria is met, based on the traffic prediction, a modem gear is adaptively adjusted; and when the second criteria is not met, an algorithm is trained or a period is waited for continuing monitoring whether the second criteria is still met.

The invention relates to the technical field of wireless communication, and provides a LoRa modulation and demodulation method and system based on a four-dimensional constellation diagram, and the method comprises the steps: segmenting the bit of to-be-transmitted information into four modulation bit sequences and a constellation mapping bit sequence at a transmitting end, determining the coordinates of four-dimensional constellation points, carrying out the LoRa modulation of each modulation bit sequence, and carrying out the LoRa modulation of each modulation bit sequence; a corresponding LoRa modulation signal is generated; wherein the at least one LoRa modulation signal is modulated based on an up chirp linear frequency modulation signal, and the at least one LoRa modulation signal is modulated based on a down chirp linear frequency modulation signal; superposing the multiple paths of signals to generate a transmitting signal; and performing demodulation processing on the received signal at a receiving end based on the up chirp linear frequency modulation signal and the down chirp linear frequency modulation signal. Compared with the prior art, the signal transmission speed under the LoRa technology is greatly improved.

The invention discloses a communication system and method compatible with APL and PA, and solves the problems that in the prior art, APL communication and PA communication cannot be compatible, communication choices are few, two sets of communication systems are needed for achieving two kinds of communication, and hardware cost is high. The system comprises a switch, the switch is connected with a plurality of APLPHY modules, each APLPHY module is connected with a change-over switch and a port, and the change-over switch is connected with the port; the port is connected with an APL device or a PA device, the change-over switch is connected with a PA modulation / demodulation module, the PA modulation / demodulation module is connected with a processor, and the processor is connected with a switch; the APL equipment port signal is connected with the APLPHY module, and the change-over switch is switched off; a port signal of the PA device is connected with the change-over switch, and the change-over switch conducts and disables the APLPHY module. Therefore, the selection of communication equipment in an industrial field is more flexible, the equipment integration level is improved, and the hardware purchase and maintenance cost is reduced.

This invention provides a signal processing test system and a signal processing test method that facilitate the efficient, effective, and flexible implementation of different types of test procedures in a test system. [Solution] The signal processing test method comprises a step 810 of selecting a signal processing mode from a header inclusion mode, a reduced header training mode, and a reduced header mode; a step 820 of executing a signal processing information determination process according to the result of the step of selecting the signal processing mode; and a step 830 of executing modulation / demodulation-related processing according to the result of the signal processing information determination process. In the reduced header mode, processing is performed on the communication signal. Header information is not initially readily available in the communication signal itself, and demodulation parameter information is advantageously derived / developed / extrapolated from other information in the communication signal.

This invention relates to the field of optical signal demodulation, specifically to a parallel optical signal modulation and demodulation method and system based on MicroLED array optical interconnects, comprising: a data acquisition module for acquiring raw data from the external environment or equipment and converting it into a form suitable for subsequent processing; a data processing module for receiving information from the data acquisition module and preprocessing it; and a data analysis module. The overall architecture of high-speed DSP+MicroLED channels breaks away from the traditional approach of "hundreds of channels, DSP-free, wide but slow." By introducing SerDes and DSP modulation and demodulation, the single-channel rate is increased by an order of magnitude, achieving a total bandwidth of ≥120Gbps with ≤32 channels. Simultaneously, single-channel 10–20Gbps OOK / PAM4 modulation is achieved: clearly defining high-order modulation of MicroLED under GHz-level bandwidth conditions, overcoming the carrier lifetime limitations of MicroLED, and ensuring low bit error rate through pre-emphasis, equalization, and FEC.

A method for detecting and adaptively compensating for ultra-low frequency weak vibrations in a MEMS accelerometer includes: a multi-channel parallel coherent modulation and demodulation module acquiring differential capacitance signals of the sensitive units in the MEMS accelerometer through n parallel coherent detection links, and then synchronously modulating and coherently demodulating the differential capacitance signals to obtain n baseband signals; an adaptive weighted fusion module evaluating the signal-to-noise ratio (SNR) of each baseband signal, and then weighting and fusing the n baseband signals using the square of the SNR as a weighting coefficient to obtain a fused signal; a dynamic temperature drift compensation module performing temperature drift compensation on the fused signal to obtain a compensated signal; and a variational mode decomposition adaptive filtering module performing adaptive filtering on the compensated signal to output the final acceleration signal. The effect is to improve the detection of ultra-low frequency weak vibrations in a MEMS accelerometer and enhance the accuracy of wide-temperature-range dynamic temperature drift compensation.

The invention discloses a core circuit for realizing accurate modulation and demodulation based on differential signal coupling design, and the core circuit comprises a differential signal coupling module which is used for converting an input signal into a differential positive signal and a differential negative signal, and outputting the differential positive signal and the differential negative signal; the signal acquisition module is used for receiving the differential positive signal and the differential negative signal and outputting an acquisition signal; the self-adaptive filtering module is used for receiving the acquisition signal and outputting a filtering control signal; the fuzzy logic control module is used for receiving the acquisition signal and outputting a mode control signal; the threshold value control module is used for outputting a protection trigger signal based on the abnormal threshold value; and the modulation-demodulation module is used for adjusting working parameters based on the filtering control signal and the mode control signal. Therefore, the signal imbalance can be accurately compensated by combining the differential signal with the self-adaptive filtering module, modulation and demodulation can be dynamically optimized through the fuzzy logic control module, and the modulation and demodulation accuracy is remarkably improved.

This invention discloses a differential chaotic phase-shift keying waveform design method and modulation / demodulation method suitable for integrated communication and sensing. In this invention, the reference subcarrier and data subcarrier within the same subcarrier group share the same chaotic reference sequence, allowing the receiver to recover the original data using the existing OFDM-DCSK incoherent detection structure. Simultaneously, based on the Riemann matrix-based group selection mapping method, by constructing a constant complex weight vector within the group, multiple OFDM-DCSK time-domain candidate waveforms are generated and selectively transmitted without changing the OFDM-DCSK system's "reference-data equal-weight spread spectrum" structure and the receiver's incoherent demodulation method, thus achieving effective suppression of PAPR in the transmitted waveform. Using the OFDM-DCSK time-domain candidate waveforms as a unified baseband signal, incoherent communication and radar sensing functions are simultaneously realized with a single hardware and spectrum resource.

The utility model discloses a pulse laser ranging echo signal precision conditioning circuit. The circuit comprises a filter circuit unit, a multiple switching unit and an operational amplifier circuit unit. The filtering power supply unit is connected with the operational amplifier single-path unit, the operational amplifier single-path unit is connected with the operational amplifier circuit unit, the operational amplifier unit adopts a precision amplifier to realize IV conversion of an avalanche photodiode (APD) circuit, and an extremely high dynamic input range is ensured through two-gear selectable transimpedance gain. Various modulation-demodulation transimpedance amplification applications are flexibly adapted, and a digital circuit is used for switching resistors to realize the amplification factor of an operational amplifier; in order to solve the problem that signals are prone to fixed-frequency interference, two-stage filters are used after two-stage amplification, and interference removal is achieved. Signals are received, a high-pass filter is adopted in the first stage, signals with the signal frequency larger than 0.05 HZ can pass through the first stage, a low-pass filter is adopted in the second stage, signals with the signal frequency lower than 100 HZ can pass through the second stage, various fixed-frequency interferences are effectively restrained, and effective signals are limited in a certain interval range.

A modulation and demodulation method, apparatus, and system are disclosed, characterized in that the method comprises the following steps: Step 1, generating a quantum step wave based on a stepped AC quantum voltage and an original carrier wave; Step 2, performing equal-interval sampling and flat-interval sampling on the quantum step wave to obtain the step distance error and flat-interval error existing between the step wave and the original carrier wave; Step 3, setting the transmission window width based on the correlation between the step distance error and the flat-interval error, and performing modulation and demodulation of the original signal based on the transmission window width. This invention has a clear concept and a simple method. By eliminating transient process data, it improves the accuracy of data demodulation and recovery processes, reducing noise while ensuring transmission efficiency.

The invention discloses a single-photon synthetic aperture rapid imaging device and method for gas leakage, and belongs to the technical field of gas detection and imaging. Aiming at the problems in the prior art, on the basis of an SPAD array detector and WMS modulation and demodulation, an FPGA is used for realizing modulation reference synchronization and photon event counting, secondary harmonics of an absorption signal are extracted through digital phase-locked demodulation, and a multi-frame PIC projection drawing is obtained; introducing a small-rotation-angle multi-view-angle acquisition and pose calibration mechanism, and performing synthetic aperture type gas reconstruction by adopting back projection / convolution back projection; two-dimensional FFT is combined with a Gaussian window to realize fast calculation of a convolution kernel frequency domain, and GPU visual angle block parallel and end-to-end data flow organization are adopted to realize fast accumulation reconstruction, so that two-dimensional gas concentration distribution is output, and deep layered gas image display is realized. The device has single-photon-level sensitivity, strong background suppression and rapid imaging capability, can realize rapid positioning and visual imaging of leaked gas plume, and has multi-gas compatibility and platformization expansibility.

The application discloses an affine frequency division multiplexing modulation and demodulation method, device, system, medium and product, the affine frequency division multiplexing modulation transmitting method comprises the following steps: obtaining a target frequency domain signal to be transmitted, and calculating two chirp matrices based on two chirp parameters; the target frequency domain signal is multiplied in parallel by the conjugate matrix of the second chirp matrix to obtain a target rotating frequency domain signal; the signal is inversely discrete fourier transformed to obtain a first target time domain signal; the first target time domain signal is secondly phase-rotated based on the conjugate matrix of the first chirp matrix to obtain a second target time domain signal; the target time domain signal is preprocessed before transmission to generate a target time domain transmitting signal and perform radio frequency transmission, and the technical scheme of the embodiment of the application can effectively solve the performance bottleneck problems, such as Doppler frequency shift sensitivity and weak anti-interference ability, of the orthogonal frequency division multiplexing technology in the high-speed mobile scene.