333 results about "Up conversion" patented technology

Systems and methods are described for video coding using generalized bi-prediction. In an exemplary embodiment, to code a current block of a video in a bitstream, a first reference block is selected from a first reference picture and a second reference block is selected from a second reference picture. Each reference block is associated with a weight, where the weight may be an arbitrary weight ranging, e.g., between 0 and 1. The current block is predicted using a weighted sum of the reference blocks. The weights may be selected from among a plurality of candidate weights. Candidate weights may be signaled in the bitstream or may be derived implicitly based on a template. Candidate weights may be pruned to avoid out-of-range or substantially duplicate candidate weights. Generalized bi-prediction may additionally be used in frame rate up conversion.

The invention relates to an ultra-low power consumption multichannel high-speed signal synchronous acquisition and emission system suitable for satellite communication. The system comprises an acquisition and emission board card which mainly comprises a plurality of radio frequency transceivers, an optical module, a clock unit, an FPGA (Field Programmable Gate Array) 1 processor and the like; the clock unit comprises a clock chip, a clock Buffer and the like; the optical module is used for receiving data, sending the data to an FPGA (Field Programmable Gate Array) 1 for processing, then sending the data to a transmitting channel of the radio frequency transceiver through a JESD204B interface for interpolation filtering, QEC (Quadrature Error Correction) calibration and refreshing, and then performing up-conversion to output an I / Q analog modulation signal; a receiving channel of the radio frequency transceiver receives an I / Q analog signal, the I / Q analog signal is sampled after low-pass filtering, the sampled data is sent to the FPGA1 for processing through the JESD204B interface after QEC calibration, and then the data is forwarded through the optical module. The system can realize ultra-low power consumption and reduce the weight of the whole machine.

This disclosure describes an auto-calibration of mixers in a quantum orchestration platform. Predistortion is computed according to an RF signal that is downconverted with a local oscillator tone that is offset from an upconverter tone. Three tones present in the original RF signal are distinguished and used to construct a cost function. The minimization of the cost function is used to cancel an unwanted LO leakage and an image tone. Because the quantum orchestration platform generates both the unconverted IQ signals and the cost function for their optimization, the optimization can be performed in real time inside a single device without the need to communicate with external devices. This allows for the optimization of single sideband upconverted signals in a fraction of the time it typically takes using distributed systems employing separate waveform generators and spectrum analyzers.

The invention relates to the technical field of radio frequency, in particular to a radio frequency conversion assembly, and the assembly comprises a baseband processing unit which employs a millimeter wave SoC chip and is used for generating and processing an initial transmitting signal of 79-81GHz and an initial receiving signal of 79-81GHz; the frequency conversion unit comprises an up-conversion subunit and a down-conversion subunit, and the local oscillation synthesis unit is used for generating and providing a local oscillation signal with a fixed frequency; the mode switching and processing system is used for selectively performing down-conversion processing on the echo signal or a target radio frequency signal from an external non-cooperative irradiation source in two working modes and then transmitting the echo signal or the target radio frequency signal to the baseband processing unit; the working mode comprises an active mode and a passive mode.

The invention discloses a millimeter wave transceiver and a state monitoring method, and belongs to the technical field of millimeter wave communication. Comprising a transceiver circuit, and the transceiver circuit is arranged on a transceiver structure. The transceiver circuit comprises an EMI circuit, a power supply system, a heat dissipation system, an up-conversion assembly, a local oscillator assembly, a down-conversion assembly, a one-to-four filtering power divider and a monitoring system. And the monitoring system is used for controlling the working states of each circuit, assembly, system and device, executing an intermediate frequency signal processing flow when receiving an intermediate frequency signal, and executing a millimeter wave signal processing flow when receiving a millimeter wave signal. The millimeter wave transceiver integrates various components, improves the integration level of the millimeter wave transceiver through a tiled layout mode and a modular design, improves the aesthetic property and safety of a product, and is extremely high in product integration level, small in size, light in weight, low in hardware cost, high in product reliability, short in later maintenance time and low in maintenance cost.

The invention discloses a multipath effect suppression method for 2.4 GHz radio frequency identification. The multipath effect suppression method comprises a transmitting end processing flow and a receiving end processing flow. A transmitting end carries out pulse code modulation on an analog signal to obtain a digital signal, blocks the digital signal after channel coding, and distributes the digital signal to subcarriers through quadrature amplitude modulation; and generating a time domain OFDM symbol through IFFT (Inverse Fast Fourier Transform), adding a cyclic prefix and a synchronization head, converting into an analog baseband signal, and performing up-conversion, filtering, amplification and radiation. The receiving end amplifies the signal, down-converts the signal to a baseband, filters the signal and converts the signal into a digital signal; the method comprises the following steps of: synchronizing header frame alignment, recovering a coding bit stream through FFT (Fast Fourier Transform) and QAM (Quadrature Amplitude Modulation) demodulation, carrying out CRC (Cyclic Redundancy Check) after decoding and merging, returning ACK (Acknowledgement Character) if According to the method, the multipath effect can be effectively inhibited, and the integrity of received data is improved.

The invention discloses an embedded special high-frequency low-level control system, which comprises a digital signal processing board card, an ADC / DAC sub-board card and a radio frequency front-end board card, the radio frequency front-end board card comprises two paths of up-conversion channels and six paths of down-conversion channels; the digital signal processing board card comprises an FPGA (Field Programmable Gate Array); wherein the radio frequency front-end board card is used for dividing an input reference line RF signal into four paths of RF reference signals and generating an LO signal; the ADC / DAC sub board card is used for ADC analog-to-digital conversion and DAC digital-to-analog conversion; the main functions of the digital signal processing board card comprise clock distribution of RF reference signals, a motor drive and piezo ceramic drive circuit, a data acquisition and logic control algorithm of an FPGA logic unit PL part, an embedded ARM system of an FPGA processor unit PS part, EPICS-IOC application of a low-level system, network data communication and the like.

The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device and method. The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device which comprises a central station, a transmission medium and a far-end base station. Wherein the central station comprises a first wavelength tunable laser (1), a local oscillator signal generator (2), a second wavelength tunable laser (3), a first double-parallel Mach-Zehnder modulator (4), an electric power divider (5), a second double-parallel Mach-Zehnder modulator (6), a 90-degree polarization rotator (7) and a polarization beam combiner (8). And a transmission medium adopts a single-mode optical fiber (9). The far-end base station comprises an optical power amplifier (10), a polarization beam splitter (11), a first photoelectric detector (12), a second photoelectric detector (13), an electric power amplifier (14), a transmitting antenna (15) and a receiving antenna (16). The invention further provides an optical up-conversion, optical fiber transmission and self-interference elimination method. According to the invention, the influence of the up-conversion transmission signal on the signal received by the far-end base station can be eliminated, the transmission quality of the received signal is improved, and the base station is simplified.

The invention discloses a shipborne radar signal source with zero-discontinuity parameter switching capability, which relates to the technical field of shipborne radars and comprises a transmitting end control unit and a radio frequency output unit. The transmitting end control unit is sequentially provided with a parameter management and pre-installation layer, a waveform synthesis layer, a deterministic delay and switching control layer, a time base consistency and channel calibration layer and a recording and diagnosis layer from the top layer to the bottom layer to form complete link output; the radio frequency output unit is provided with a digital-to-analog conversion and intermediate frequency up-conversion link and an external up-conversion and power amplifier link. A double DDS ping-pong and pre-installed preheating switching mechanism, a phase state copying and aligning mechanism, a delay calibration and on-line compensation mechanism and a multi-channel time base consistency and channel calibration mechanism are provided, the problems of interruption, amplitude phase jump, moment jitter, poor multi-channel consistency and the like existing in the parameter switching process of an existing simulation source are solved, and meanwhile the simulation source has the event recording and diagnosing functions. And the reliability and the accuracy of the electric detection equipment on the sea test are ensured.

The invention relates to the technical field of data processing, and discloses an integrated reconnaissance interference method and system based on a transmit-receive cancellation technology, and the method comprises the steps: receiving a mixed signal containing a target radar signal and a leakage interference signal through a receiving channel, and obtaining a first digital signal after down-conversion and analog-to-digital conversion, the leakage interference signal is a signal leaked from the transmitting channel to the receiving channel; acquiring a second digital signal corresponding to an interference signal generated in the transmitting channel, and transmitting the interference signal through an antenna after digital-to-analog conversion and up-conversion; taking the second digital signal as a reference signal, performing adaptive cancellation processing on the first digital signal through an adaptive filter to suppress a leakage interference signal component in the first digital signal, and generating a cancelled signal; wherein in the adaptive cancellation processing process, the digital processing unit adaptively updates the cancellation filtering weight of the adaptive filter according to the reference signal and the cancelled signal.

The invention belongs to the technical field of full-duplex communication, and particularly discloses a high-isolation full-duplex transceiver system and a control method.The system comprises a transmitting module, a receiving module and a full-duplex baseband module, the transmitting module comprises a power amplifier module and a first oscillator, the power amplifier module is connected with the full-duplex baseband module, and the first oscillator is connected with the receiving module; an intermediate frequency signal transmitted by the full duplex baseband module enters the power amplifier module, is mixed with a signal with a frequency f4 generated by the first oscillator, and is up-converted to a frequency f3; the receiving module comprises a second oscillator and a low-noise amplifier module, the second oscillator is connected with the low-noise amplifier module, a receiving antenna of the receiving module receives the signal and inputs the signal into the low-noise amplifier module for frequency mixing with the signal of the second oscillator, the signal is down-converted to frequency f2, and the signal enters the full-duplex baseband module for data processing. By adopting the technical scheme, based on each module, the influence of self-interference leaked by a transmitting link on a receiving link is completely avoided, and the design complexity of any system is not increased.

The present disclosure provides a method and a system to estimate LO leakage and quadrature error parameters for a transmitter RF front end, such as a direct up-conversion transmitter RF front end, in a joint fashion. The proposed method utilizes a PN sequence inserted at the transmitter baseband. At the observation receiver side, an RX accumulator is implemented to sum receiver signals to take advantage of a despreading gain using the same PN sequence from transmitter side. Through the despreading process, the receiver-transmitter channel may be estimated and used to extract the quadrature error parameters. The estimated channel may also be used to eliminate user data interference presented within the RX accumulator output, which may further be used to compute the LO leakage.

One or more systems, devices and / or methods of use provided herein relate to a baseband filter that can be used in a current-mode end-to-end signal path. The current-mode end-to-end signal path can include a digital to analog converter (DAC) operating in current-mode and an upconverting mixer, operating in current-mode and operatively coupled to the DAC. In one or more embodiments, a device used in the signal path can comprise a baseband filter that receives an input current and outputs an output current. The baseband filter can comprise a feedback loop component having an active circuit branch and a passive circuit branch coupled in a loop. A mirroring device can be coupled to the feedback loop component and can provide an output of the device. Selectively activating the mirroring device can vary gain, such as of the mirroring device.

The cognitive communication system comprises a spectrum sensing unit, an intelligent cognitive communication decision module, a reconfigurable optical local oscillator generation module, a digital signal processing module, a cognitive communication receiving end and a cognitive communication transmitting end. The cognitive communication receiving end comprises a communication receiving radio frequency processing module, a photon radio frequency communication receiving module and a communication receiving intermediate frequency processing module; the cognitive communication transmitting end comprises a communication transmitting radio frequency processing module, a photon radio frequency communication transmitting module and a communication transmitting intermediate frequency processing module; the photon radio frequency communication receiving module converts a radio frequency signal into an optical carrier wave through optical carrier wave modulation, and down-converts the optical carrier wave into an intermediate frequency by using a reconfigurable optical local oscillator signal; the photon radio frequency communication transmitting module converts an intermediate frequency signal into an optical carrier through optical carrier modulation, and performs up-conversion to a radio frequency by using a reconfigurable optical local oscillator signal. According to the invention, through deep fusion of the photon technology and cognitive communication, the bandwidth, flexibility, anti-interference capability and dynamic reconstruction capability of the system are significantly improved.

The invention provides a channel reconfigurable SAR echo simulator and method, and relates to the technical field of spaceborne SAR and airborne SAR echo simulation testing, the simulator comprises a radio frequency down-conversion part, an ADC acquisition channel, a signal selection module, a baseband echo modulation channel, a signal convergence module, a DAC playing channel, a radio frequency up-conversion part and a parameter resolving part, the signal selection module and the signal convergence module can carry out transmission connection topology flexible configuration, so that a baseband echo modulation channel carries out echo generation of a corresponding mode according to the multi-channel requirement of SAR echo simulation, and the requirements of three modes are realized through a set of hardware, fixed computing resources and software configuration. Therefore, the technical problem that the echo simulation channel of the existing SAR echo simulator is relatively independent and can only meet the single application requirement can be solved.

The invention discloses a high-resolution SAR deception jamming signal rapid generation method and device, and belongs to the technical field of radar countermeasure. The method comprises the following steps: intercepting an SAR signal and measuring parameters of the SAR signal; obtaining a deception jamming template image, and carrying out edge optimization processing; performing two-dimensional partitioning on the template in the distance direction and the azimuth direction to obtain a plurality of sub-templates; calculating a phase compensation function for the central point of each sub-template, and carrying out phase optimization; the optimized sub-templates are superposed, and a high-quality product modulation matrix is generated; and multiplying the matrix by an intercepted SAR signal, and transmitting after digital-to-analog conversion and up-conversion to form a deception jamming signal. According to the method, through block phase compensation and template edge optimization, the imaging quality and concealment of the deception jamming image under the high-resolution SAR are remarkably improved, meanwhile, low calculation complexity is kept, and the method is suitable for satellite-borne and airborne SAR systems.

In one embodiment, an apparatus includes a baseband processor to generate a baseband signal and a digital pre-distortion (DPD) circuit to pre-distort the baseband signal with compensation information obtained from a lookup table. The lookup table may have a plurality of entries each to store a pre-distortion value, the lookup table to be addressed based on a target output power level of the baseband signal. The apparatus also may include a converter to convert the pre-distorted baseband signal to an analog signal and radio frequency (RF) circuitry comprising: a mixer to upconvert the analog signal to a pre-distorted RF signal, and a power amplifier to amplify the pre-distorted RF signal.

The invention provides a signal pre-distortion processing method and device, electronic equipment and a storage medium, and relates to the technical field of communication, and the method comprises the steps: firstly carrying out the calculation of historical baseband data and historical baseband feedback data through a memory polynomial model, and obtaining a pre-distortion complex number coefficient group, then applying the predistortion complex coefficient group to a baseband signal to generate an in-phase component signal and a quadrature component signal containing amplitude and phase predistortion information, and then respectively carrying out carrier modulation on the in-phase component signal and the quadrature component signal to obtain an in-phase branch signal and a quadrature branch signal; and then calculating according to the in-phase branch signal and the orthogonal branch signal to obtain a pre-lost real signal, and finally carrying out carrier modulation on the pre-lost real signal to obtain an up-conversion signal. By implementing the technical scheme provided by the invention, the technical problem that phase pre-distortion information cannot be reserved in a signal pre-distortion process is solved.

The invention discloses a satellite-borne high-integration emission phased-array antenna, which is characterized in that an antenna radiation unit array, a secondary feed network and a power supply and control circuit of a T component array are integrated in a PCB (Printed Circuit Board) sub-array, and a phase shift and attenuation control channel, a power amplifier and a primary feed network are integrated in each T component; a minimum function unit of the phased-array antenna is formed by one PCB sub-array and a T assembly array installed on the PCB sub-array, and a plurality of minimum function units are combined through a radio frequency expansion mother board, so that modular connection and signal distribution are realized, and different emission requirements are met; the minimum function unit, the radio frequency expansion mother board and the thermal control board are longitudinally arranged in a vertical stacking mode, the wave control power supply module, the up-conversion amplification module and the vertical stacking module group are transversely arranged in the same plane, and a heat conduction path is greatly shortened. According to the invention, the longitudinal profile height, the overall size and the system weight of a traditional brick type phased-array antenna are obviously reduced, and the antenna can better meet the application requirements of a low earth orbit flat plate type satellite platform.

The invention discloses a signal reading system and method for superconducting microwave multiplexing device detection, and belongs to the field of superconducting microwave multiplexing device detection, and the system comprises a server which can issue a detection configuration instruction to a signal board, receive and return detection data, operate detection software, execute spectrum analysis and data analysis, and generate a detection result; the signal board is provided with a circuit containing a programmable logic device, and the circuit can output accurate intermediate frequency signals and excitation current signals according to instructions of the server, processes output signals of the detected superconducting microwave multiplexing devices mixed by the frequency mixing board through a critical sampling filter bank algorithm to obtain detection data, and transmits the detection data back to the server; and the frequency mixing plate can perform up-conversion on the intermediate frequency signal generated by the signal plate to radio frequency to form a radio frequency detection signal, output the radio frequency detection signal to each detected superconducting microwave multiplexing device, perform down-conversion on the radio frequency response signal returned from each superconducting microwave multiplexing device to intermediate frequency, and output the radio frequency response signal to the signal plate. The system can detect the quality of the device with low computing resources.

The utility model discloses an anti-interference radio frequency device, and relates to the technical field of radio frequency devices. Comprising an antenna array, an anti-interference processing unit connected with the antenna array through a down-conversion channel and a straight-through channel, an up-conversion channel connected with the anti-interference processing unit, and a clock unit respectively connected with the down-conversion channel, the anti-interference processing unit and the up-conversion channel. Two radio frequency chips are connected between the down-conversion channel and the anti-interference processing unit and between the straight-through channel and the anti-interference processing unit. According to the anti-interference radio frequency device, the two radio frequency chips with four independent down-conversion receiving channels are adopted, an original frequency synthesizer unit is omitted, and the reliability of the device is improved; four channels are supported to receive radio frequency signals of the same frequency point at the same time, an anti-interference array receiver is formed, clock signals generated by a radio frequency chip can be multiplexed, under the same size, the size is reduced, the power consumption is reduced, the anti-interference performance is remarkably improved, the use requirement of product development is met, and good market popularization prospects are achieved.

The invention discloses a power supply circuit and electronic equipment, and relates to the technical field of display. The power circuit comprises a first power module and a second power module. The input end of the first power module is used for receiving power voltage. The output end of the first power module is connected with the input end of the second power module, the output end of the second power module is used for providing power supply voltage for the display driving module, and the display driving module is used for driving a screen to display images. Wherein under the condition that the at least two strings of batteries provide a power supply voltage with a wide input voltage range, the first power supply module is added, the power supply voltage is subjected to voltage reduction conversion, the second power supply module is subjected to voltage boosting conversion to form a power supply voltage, and the power supply voltage enables the display driving module to drive the screen to display an image. The power supply circuit can meet low-voltage-withstanding power supply, and the power supply voltage is firstly reduced and then increased, so that the lowest power supply voltage of the display driving module can be met, the voltage is reduced when a screen is in light load, the output power is increased, and the power supply efficiency in light load is improved.

The invention discloses a method for detecting a frequency hopping signal under a low signal-to-noise ratio based on an FPGA (Field Programmable Gate Array), which comprises the following steps of: at a transmitting end, adding a synchronous sequence with low side lobe, high anti-interference performance and self-adaptive adjustment of sequence length under different channel conditions to a frame header and a frame tail of a data frame, and after coding modulation and up-conversion at the transmitting end, carrying out frequency hopping on the frequency hopping signal under the low signal-to-noise ratio; the frequency hopping signals are converted into a group of frequency hopping signals with m hops; and at a receiving end, counting over-threshold frequency hopping signals, jointly judging whether the packet of data is valid data, and dynamically adjusting a correlation peak threshold according to a channel condition. According to the invention, the synchronization accuracy is improved.

The invention discloses a high-speed data transmission high-order modulation compensation power amplifier linear distortion system, and belongs to the technical field of satellite high-speed data transmission. The system comprises a data processing module, a constellation mapping module, a shaping filtering module, a quadrature modulation module, a radio frequency up-conversion module, a power amplifier output module, a weighting parameter calculation module and a mapping correction module. Phase point analysis is carried out on a power amplifier output signal through a frequency spectrograph, constellation points after power amplifier compression are obtained and are compared with standard mapping phase points to generate correction parameters, then a mapping correction module is used for carrying out weighted adjustment on constellation mapping, and peripheral phase point amplitude compression caused by power amplifier saturation is compensated. According to the method, phase point distribution can be corrected through digital preprocessing under the power amplifier saturation working condition, linear distortion of high-order modulation signals is effectively improved, the power amplifier backoff amount is reduced, the power amplifier efficiency is improved, and the method is suitable for a non-amplitude balance high-order modulation scene in a satellite high-speed data transmission system.

The invention relates to a same-time same-frequency full-duplex communication and ranging integrated processing system and method. The system comprises a transmitting chain baseband signal processing module for processing a communication signal and a ranging signal; the radio frequency transmitting channel is used for performing DAC (Digital-to-Analog Converter) and up-conversion processing on a local transmitting signal and then processing the local transmitting signal into a high-frequency transmitting signal to an antenna through a radio frequency transmitting signal; the radio frequency receiving channel is used for performing DAC and down-conversion after the received signal is processed to intermediate frequency, and outputting a digital baseband received signal; the real-time zero value measurement module is used for measuring channel time delay so as to calculate a system zero value; the self-interference suppression module is used for carrying out self-interference suppression on self-interference channel estimation and self-interference signal reconstruction; the receiving link baseband communication signal processing module is used for recovering communication data information; and the receiving link baseband ranging signal processing module is used for outputting ranging service signals. The method has the capability of transmitting and receiving ranging signals and communication signals at the same time and at the same frequency, improves the spectrum utilization rate and reduces ranging errors.

The invention provides an SAR time domain high-fidelity moving target single-base deception jamming method and device, and belongs to the technical field of radar countermeasure, and the method comprises the steps: obtaining a signal parameter of a signal transmitted by an SAR platform, and generating an initial signal of an additional two-dimensional time domain coupled modulation phase; determining the center position of a false target group, designing an interference area position control template, multiplying the interference area position control template with an initial signal, and controlling the position of an interference area; designing a multi-target rapid generation template according to the initial position coordinates of the false moving targets, and multiplying the multi-target rapid generation template with the multiplied signals to generate a plurality of false moving target signals with consistent speed; for false moving targets with different speeds, designing a parallel operation two-dimensional time domain coupled modulation phase and a multi-target rapid generation template in a classified manner, and obtaining a final interference signal; and performing digital-to-analog conversion and up-conversion processing on the final interference signal, and forwarding the final interference signal to a target SAR system pulse by pulse. According to the invention, a single jammer can generate a plurality of high-fidelity false moving targets in different moving states.

The invention discloses a radar communication integrated radiation source simulation system and method. The system comprises an upper computer control unit, a signal processing unit, an up-conversion unit and an antenna unit. An unknown radar or communication signal is analyzed by adopting a signal characteristic analysis method based on phase difference, whether the signal is a complex signal is judged, the waveform of the signal is stored and generated by adopting a DDWS technology aiming at the unknown complex signal, the waveform of the signal is directly generated by adopting a modulation module of a signal processing unit aiming at a conventional signal, and the waveform of the signal is directly generated by adopting a modulation module of a signal processing unit aiming at a known complex signal. The waveform of a fixed part in a signal is synthesized by adopting a DDWS technology, a modulation module of the signal processing unit is used for generating a non-fixed part, and the fixed part and the non-fixed part are combined according to a signal message format time sequence, so that the simulation of a complex signal is realized, and the requirement of current electronic countermeasure training on radar communication integrated radiation source simulation is met.

A lighting apparatus includes a light source, a power module, a controller, a data input module, a serial-to-parallel converter module, an orthogonal frequency division multiplexing (OFDM) modulation module, a radio frequency (RF) upconversion module and an antenna module. The light source including multiple types of LED modules. The controller generates multiple driving currents supplied to the LED modules. The data input module is coupled to the controller. The data input module receives input data to be transmitted. The serial-to-parallel converter module converts the input data into multiple parallel data streams. The orthogonal frequency division multiplexing (OFDM) modulation module modulates the parallel data streams onto multiple orthogonal subcarriers. The antenna module includes multiple antennas configured to transmit RF signals corresponding to the multiple data streams.

The invention discloses a radar communication integrated waveform design method based on an OFDM (Orthogonal Frequency Division Multiplexing) signal. The method comprises the following steps that: a transmitting end completes constellation mapping on transmitted communication information, performs ZCT matrix reconstruction, performs serial-parallel conversion on reconstructed communication data, performs spectrum shaping on an integrated signal by adopting an improved Nyquist pulse, and transmits the integrated signal to a receiving end; and then IFFT processing, parallel-to-serial conversion, cyclic prefix addition, digital-to-analog conversion and up-conversion are carried out on the shaped data, and finally integrated waveform emission is completed. And the receiving end performs down-conversion, analog-to-digital conversion and cyclic prefix removal operation on the received signal. In the communication function, serial-to-parallel conversion, FFT processing, inverse pulse shaping, parallel-to-serial conversion, ZC matrix reconstruction solution and inverse mapping are carried out on the data without the cyclic prefix to obtain communication information. In the radar detection function, radar signal processing is performed on data without cyclic prefixes. According to the method, the correlation of OFDM integrated signals can be effectively optimized, the modulation characteristic of communication information is improved, the influence of the communication information on a fuzzy function is reduced, OFDM symbols have better correlation, meanwhile, the peak-to-average power ratio of the system is effectively reduced through pulse shaping, implementation is easy, and the comprehensive performance of the system can be remarkably improved.

A method and system for testing the conversion losses of terahertz mixers capable of eliminating the influence of radio frequency sources includes grouping a mixer to be tested and at least two reference mixers in pairs; in each group, inputting a signal of a preset frequency and a preset power at an intermediate frequency port of a first mixer, and after up-conversion, outputting same to a second mixer to be down-converted, so as to obtain an output power with the frequency same as the preset frequency, and obtain the relationship between a first output power and a first preset power and the losses of two mixers; according to the relationship between the loss of the mixer in each group and the power, obtaining the loss of the mixer to be tested.