64 results about "Channel simulator" patented technology

The invention relates to a super-large scale array simulation method and device based on a wireless channel simulation instrument. The method comprises the following steps: quickly transmitting a phase sequence output by a phase shifter to the simulation instrument; the method comprises the following steps: discretely generating a track of a terminal, storing the track in a memory of a channel simulator, multiplying an additional phase of a phase shifter and a steering vector according to strict time synchronization, and outputting amplitude and phase gains brought by spatial correlation in an array unit; according to the single-array channel impact response at the moment t, generating a channel impact response of a single array in an array unit by utilizing a specified channel modeling method according to a terminal track; calculating a steering vector of an array in the array unit to each position of the UE; the data processing module performs dot product summation according to the phase shifter data transmitted by the high-speed interface and the array steering vector read from the memory; and the channel impact response and the input signal are multiplied to complete a fading channel simulation process, so that two-stage weight dynamic adjustment of the Massive MIMO system and a super-large-scale antenna array simulation test are realized.

The invention discloses a communication and inductance integrated test method based on a channel simulator, and relates to the technical field of next-generation wireless communication. According to the method, the basic functions of the channel simulator are expanded, so that the channel simulator can generate deceptive echoes for sensing testing on the basis of communication testing, and comprehensive evaluation of communication and sensing functions of the communication and sensing integrated base station is realized. The invention further discloses a communication and sensing integrated test system based on the channel simulator, the simulation capability of the channel simulator is utilized, the sensing channel model is loaded at the same time, and sensing targets in different propagation scenes are simulated by adjusting parameters such as time delay and Doppler frequency shift. Experimental verification shows that the method can realize efficient testing of the communication and inductance integrated base station without introducing extra expensive equipment, and has the characteristics of high cost effectiveness and strong scene adaptability.

The invention discloses a USRP satellite communication simulation system based on communication state iteration stability prediction, and belongs to the technical field of mobile communication. The system comprises an analogue simulation system and a semi-physical access system, the analogue simulation system comprises USRP equipment, a channel simulator and ground gateway station equipment, and simulation software runs in the channel simulator; the USRP equipment is used for simulating communication behaviors of a satellite and a load; the channel simulator is used for simulating a real channel environment and electromagnetic interference; the analogue simulation system is used for modeling and simulating behaviors of a satellite, a load, a communication link, a core network and a ground gateway station to generate experimental data, performance indexes and statistical results; and the semi-physical access system displays the communication state of the semi-physical according to the channel environment and the satellite data provided by the analogue simulation system. According to the invention, the user can truly feel the use experience of the satellite internet through the communication and data service of the simulation terminal.

The invention provides a multi-channel wireless channel simulator supporting extensible radio frequency channels and arithmetic units. The multi-channel wireless channel simulator comprises a group of radio frequency receiving units, a branching unit, a group of digital signal processing units, a combining unit and a group of radio frequency transmitting units, the group of radio frequency receiving units adjust the power of the received radio frequency signals, perform down-conversion and analog-to-digital conversion to obtain digital baseband signals, and then respectively send the digital baseband signals to the shunt unit; the shunting unit shunts the received digital baseband signals and sends the shunted digital baseband signals to a group of digital signal processing units respectively; each digital signal processing unit superposes channel characteristics on the received digital baseband signals and then sends the signals to the combiner; and the combiner combines the signals sent by the group of digital signal processing units and sends the combined signals to each radio frequency sending unit. The multichannel wireless channel simulator provided by the invention supports extensible radio frequency channels and arithmetic units, and is flexible in hardware architecture, low in cost and small in data processing pressure.

The invention discloses a virtuality and reality combined communication network semi-physical simulation platform and method, relates to the technical field of computer simulation, and can meet accurate simulation requirements under the condition of a large-scale wireless network. The platform comprises a physical node, a virtual node, a radio frequency channel simulator and a link channel simulator. The physical node comprises a first container server and a software radio platform, and the first container server deploys a non-real-time part; deploying a real-time part by the software radio platform; and the container server is connected with the software radio platform through a network port. The virtual node comprises a second container server and a software radio baseband processing board, and the second container server deploys a non-real-time part; the software radio baseband processing board deploys a real-time part, and the container server is connected with the software radio baseband processing board through a network port. The physical nodes are interconnected through the radio frequency channel simulator, the virtual nodes are interconnected through the link channel simulator, and the virtual nodes and the physical nodes are interconnected through the container network.

The invention relates to a method for realizing path loss dynamic adjustment based on channel simulation and radio frequency compensation, and the method comprises the following steps: constructing a scene model, and carrying out the parameter configuration of a plurality of functional modules; running the configured model and scene file; calling an algorithm module to package the model data according to the scene file and a function module started by the model; and issuing logic control word and radio frequency control word combinations of the functional modules, synchronizing signals and starting playing simulation. By adopting the method and device for realizing path loss dynamic adjustment based on channel simulation and radio frequency compensation, the processor and the computer readable storage medium thereof, various environmental factors can be comprehensively considered, a complex and high-precision channel model is provided, and the accuracy of a simulation result is improved; and the change of the channel state can be monitored and responded in real time. Through simulation of path loss in the channel simulator, a user can identify and solve potential problems before actual deployment, so that the frequency and cost of field testing are reduced.

The invention provides a testing system, method and device, a storage medium and a program product, relates to the technical field of industrial testing, and solves the technical problem of unreliability of testing in related technologies. The test system comprises a wireless channel simulation instrument, a network damage instrument, a network forwarding unit, a service scene module and an application server. Deploying a wireless channel model capable of reflecting wireless channel characteristics of a to-be-tested service scene and network configuration of the to-be-tested service scene in the line channel simulation instrument; the network damage instrument is used for performing simulation regulation and control on network indexes; the business scene module comprises an entity environment and a simulation environment; the simulation environment is constructed through equipment modeling, control logic simulation and industrial automation system twinning; the entity environment is constructed through entity equipment, logic control and network configuration; and software corresponding to the to-be-tested business scene is deployed in the application server, and the application server is used for interacting with the business scene module and testing and evaluating the operation index of the to-be-tested business scene.

This invention belongs to the field of communication technology, and particularly relates to a code Doppler verification device and method. An initial pseudo-random sequence C(t) is periodically sent from a signal source to a wireless channel simulator. The wireless channel simulator adds a code Doppler effect to the acquired initial pseudo-random sequence C(t) to obtain a pseudo-random sequence C′(t), and sends the pseudo-random sequence C′(t) and the initial pseudo-random sequence C(t) to a spectrum and signal analyzer. The spectrum and signal analyzer performs orthogonal demodulation and low-pass filtering on the initial pseudo-random sequence C(t) and the pseudo-random sequence C′(t) to obtain a pseudo-random sequence C0. n (t) and pseudo-random sequence C′ m (t), and the initial pseudo-random sequence C(t) and the pseudo-random sequence C n (t) and pseudo-random sequence C′ m (t) is sent to the host computer; the host computer, based on the initial pseudo-random sequence C(t) and the pseudo-random sequence C... n (t) and pseudo-random sequence C′ m (t) Verify whether the added code Doppler is consistent with the effect of symbol compression or expansion caused by the actual speed.

The invention relates to the technical field of signal detection, in particular to mobile phone signal detection equipment, which comprises a central control module; the radio frequency channel simulator is connected with the central control module and is used for receiving the synchronous control instruction and the time-varying channel parameters from the central control module; the space environment simulation device is used for radiofrequency signals and dynamically adjusting space radiation characteristics and link loss of the space environment simulation device based on instructions of the central control module; the protocol stack simulation and signaling interaction module is used for simulating cellular network protocol stack behaviors according to the instruction of the central control module and carrying out signaling interaction with the mobile phone to be tested; a multi-dimensional data acquisition and analysis module; according to the device, the radio frequency channel simulator, the space environment simulation device and the protocol stack simulation module are dispatched in a unified mode through the central control module, complex wireless scenes from geographical environment and channel characteristics to network behaviors can be accurately reproduced, and the reliability and repeatability of testing are greatly improved.

The invention provides a data code stream processing system. The data code stream processing system comprises an uplink deframer, an uplink selector, an uplink code stream receiver, a modulator, a channel simulator, a downlink selector, a downlink code stream generator, a demodulator and a downlink framer, the uplink deframer carries out deframing processing on an uplink data code stream sent by the protocol stack; the uplink code stream receiver receives the uplink data code stream after being selected by the uplink selector; the downlink code stream generator sends a downlink data code stream after being selected by the downlink selector; the downlink framer carries out framing processing on the downlink data code stream and then sends the downlink data code stream to the protocol stack; the condition of random packet length can be handled, the conditions of packet distribution, packet adhesion, packet breakage, packet blockage and packet loss in the transmission process are effectively handled, and the condition that secondary wrong packets are generated due to wrong packets transmitted by the demodulator is avoided; and service interface self-loop verification is directly carried out, so that the development efficiency and the stability and reliability of service interface development are improved.

An air to ground (ATG) communication system testing platform may be configured to operably couple a base station to an aircraft base radio in a lab environment. The testing platform may include a position simulator and a channel simulator. The position simulator may be configured to generate simulated aircraft position information and communicate the simulated aircraft position information to an aircraft base radio and a base band unit of the base station. The channel simulator may operably couple a remote radio head of the base station to the aircraft base radio, and may be configured to emulate channel conditions with respect to transmission of signaling generated by the remote radio head for communication to the aircraft base radio based on the emulated channel conditions.

Embodiments of the present application provide a channel playback method and related equipment, which relate to the field of communication; in the method, first channel data collected by a terminal in a real scene is obtained. Data compensation is performed on the first channel data to obtain a channel playback model, and the data compensation includes handover compensation and / or network dropout and re-entry compensation. Based on the channel playback model, channel playback is performed using a channel simulator to obtain second channel data collected by the terminal. In the scheme, first channel data collected by the terminal is obtained first, then data compensation is performed on the first channel data to obtain a channel playback model, and based on the channel playback model, channel playback is performed using a channel simulator to obtain second channel data collected by the terminal. By using the method of the scheme, channel playback can be performed in a laboratory, which not only can reduce test cost and improve test efficiency, but also can facilitate terminal testing, shorten the test period and listing time of the terminal.

The invention relates to a method for realizing signal dynamic large time delay processing in a channel simulator. The method comprises the following steps: a time delay counter starts to count; when the count of the delay counter count is smaller than the time delay duration, executing data writing operation on the first buffer FIFO and the DDR4; data reading operation is executed on the second buffer FIFO and the DDR4; when the count of the time delay counter count is larger than the time delay duration and smaller than two times of the time delay duration, data reading operation is executed on the first buffer FIFO and the DDR4; executing a data writing operation on the second buffer FIFO and the DDR4; and when the count of the time delay counter count reaches two times of the time delay duration, DDR4 data writing operation is executed on the first DDR4 and the second DDR4. By adopting the method and the device for realizing the signal dynamic large time delay processing in the channel simulator, the processor and the readable storage medium thereof, the time delay controllable range is enlarged, and the environment requirement is met.

The invention relates to the field of circuit modulation, in particular to a data interpretation system and method based on a channel simulator, and the system comprises a satellite toolkit secondary development module, a channel simulation module, a reading module, an analysis module and a visualization module. A satellite toolkit secondary development module is used for acquiring satellite toolkit data and performing secondary development on the satellite toolkit data to obtain satellite toolkit scene data; then, the channel simulation module performs channel simulation according to the satellite toolkit scene data to obtain a channel simulation result; and finally, reading, analyzing and visualizing a channel simulation result so as to accurately evaluate the influence of path loss, Doppler, noise and the like of a real channel on the signal. And displaying the dynamic tracks of the satellite orbit and the communication link in real time.

The invention discloses a D wave band frequency expansion device system for a channel simulator and a calibration method, the D wave band frequency expansion device system comprises a low-frequency channel simulator, a local oscillator distributor, a D wave band transmitting link, a D wave band receiving link and a D wave band waveguide bi-directional coupler, and the system supports terahertz frequency band spread spectrum and calibration functions of the low-frequency channel simulator. A local oscillator distributor is adopted to ensure phase synchronization of an uplink and a downlink, and receiving and transmitting isolation of the same physical channel is realized through a waveguide bi-directional coupler, so that uplink and downlink full duplex testing of communication equipment is realized. Calibration of the whole system is completed by the low-frequency channel simulator and the frequency expansion device together, and compensation of nonlinearity, amplitude-frequency and local oscillation leakage of D-band signals can be achieved by adopting the calibration method. Compared with the prior art, the device can realize accurate simulation of a D-band full-band channel and full-duplex transceiving performance verification, and provides more reliable technical support for test and verification of high-band wireless communication.

The invention discloses an error recovery method, device and equipment of an AVS3-oriented video coding and decoding system and a storage medium, and relates to the technical field of computers, and the method comprises the steps: separating a video frame code stream into a picture header packet and a plurality of Patch packets based on a start code through a channel simulator, packaging identification information to generate a to-be-processed network packet, and transmitting the to-be-processed network packet to a server; judging whether the picture header packet and each Patch packet are lost or not, and if the picture header packet is lost or all the Patch packets are lost, judging that the current code stream is unavailable; if the picture header packet is not lost and at least one Patch packet is not lost, the picture header packet and the unlost Patch packet are written into an output code stream, and the AVS3 decoder judges the frame loss condition according to the display sequence interval of the current frame and the previous frame in the output code stream and performs data recovery by adopting a corresponding error recovery method. Error recovery efficiency of a video coding and decoding system is improved.

The invention discloses a millimeter wave OTA dynamic performance test method based on a segmentation algorithm, which comprises a segmentation algorithm and a probe selection and optimization algorithm, and is characterized in that the segmentation algorithm is used for dividing I test points into N segments for probe optimization and test, the probe selection and optimization algorithm is used for determining the probe position and the probe weight of each test point in the segment. The segmentation algorithm is applied to the field of OTA testing, the optimization frequency of the probe position and the weight is reduced, meanwhile, the switching pressure of a switch matrix and discontinuity caused by the switching pressure are reduced, the number of channels of a channel simulator is reduced during testing, the testing cost is reduced, the testing range is expanded, and the testing efficiency is improved. According to the method, the complexity of probe weight optimization confirmation in the whole dynamic test process is reduced, the whole test system is convenient to implement, various target channels can be accurately constructed by expanding the construction range of the dynamic channels, and the requirements of future mobile communication are met.

The application provides an automatic interference power control method and device for interference of two nodes, which comprises the following steps: firstly, constructing a topology network structure of an end machine node in a multi-port channel simulator; secondly, monitoring interference power of different paths by a path planning in the multi-port channel simulator, and feeding back the interference power of different paths to a controller through a network cable; finally, judging the correctness and consistency of the power of different paths by the controller, so that the occurrence of false alarm events is effectively avoided, and the reliability of test results is improved.

An air to ground (ATG) communication system testing platform may be configured to operably couple a base station to an aircraft base radio in a lab environment. The testing platform may include a position simulator and a channel simulator. The position simulator may be configured to generate simulated aircraft position information and communicate the simulated aircraft position information to an aircraft base radio and a base band unit of the base station. The channel simulator may operably couple a remote radio head of the base station to the aircraft base radio, and may be configured to emulate channel conditions with respect to transmission of signaling generated by the remote radio head for communication to the aircraft base radio based on the emulated channel conditions.

The invention discloses a high-precision code Doppler implementation method for a channel simulator, which comprises the following steps that: a user sets a working bandwidth, a working frequency point, a movement speed and a working mode, calculates a code Doppler frequency shift amount and a Doppler frequency shift amount, converts the code Doppler frequency shift amount and the Doppler frequency shift amount into a fixed point number, and issues the fixed point number to an FPGA (Field Programmable Gate Array); the FPGA generates carrier waves according to the issued Doppler frequency shift amount; positive and negative code offsets are judged, input / output signal accumulation is achieved through a memory according to the positive and negative code offsets, and meanwhile, the memory is controlled through ping-pong operation to complete read-write synchronization through an offset address control technology; performing a secondary decimal interpolation algorithm on the input signal; and reconstructing a code element, generating Doppler frequency shift according to a set Doppler control word, carrying out convolution on the Doppler frequency shift and a reconstructed signal, and outputting through a DA (Digital-to-Analog). According to the invention, the hardware structure is simplified, the flexibility of the system is improved, the leakage of the mirror image signal of the critical bandwidth is greatly inhibited, and the dynamic continuous code Doppler effect simulation is realized.

This application provides a terminal testing method, apparatus, testing equipment, storage medium, and program product, applicable to the field of communication technology. The method includes: oversampling a received signal from a channel simulator to obtain an oversampled signal; performing a discrete Fourier transform on the oversampled signal to obtain a frequency domain signal; in the frequency domain signal, cyclically sliding the signal with spectral lines as the center and the signal bandwidth as the window size, and determining the power sum of the spectral lines within each sliding window to obtain a power sum sequence; determining a coarse frequency offset estimate of the received signal based on the power sum sequence; and using the coarse frequency offset estimate for terminal network access testing. This method achieves fast and stable acquisition of large frequency offsets and is suitable for coarse frequency offset estimation in narrowband satellite communication testing scenarios.

The present invention relates to a broadband satellite communication verification system, comprising: a user segment, a channel, a space segment and a ground segment; the user segment comprises: a broadband terminal station prototype, a large-scale terminal station simulator, a beam hopping modulation terminal, a beam hopping demodulation terminal and a service simulator; the channel comprises: a satellite channel simulator; the space segment comprises: an on-board digital transparent processor prototype and a beam hopping simulation payload; the ground segment comprises: a network management system, a gateway prototype and a gateway simulator; the broadband terminal station prototype is used to receive and transmit Ka-band signals, and perform power amplification, up-conversion and down-conversion on the Ka-band signals, and complete data modulation, demodulation, processing and forwarding. The present invention solves the problem of the current lack of relevant verification systems and verification methods, and the inability to provide technical feasibility verification for engineering applications.

The invention provides a 5G wireless channel simulator error vector amplitude measuring device which comprises a computer, a digital-to-analog converter, an up-converter, a wireless channel simulator and an analog-to-digital converter which are in communication connection in sequence, and the up-converter and the analog-to-digital converter are also in communication connection. Wherein a first line on-off switch is arranged on a communication line between the up-converter and the analog-to-digital converter, and a second line on-off switch is arranged on a communication line between the up-converter and the wireless channel simulator. Through brand-new configuration of equipment and the content of an added algorithm, a detection function and frequency band extension (up to 40GHz) are added, and a broadband vector modulation signal is received and detected to obtain the error vector amplitude of the wireless channel simulator.

The invention discloses an OFDM (Orthogonal Frequency Division Multiplexing) communication signal data set manufacturing method based on an FPGA (Field Programmable Gate Array) and programmable interception, solves the problems of few tag dimensions and lack of an OFDM communication system of the existing communication signal data set, and belongs to the field of computer vision. Comprising the following steps: adopting FPGA equipment as a transmitter, a cooperative end receiver and a non-cooperative detection receiver; the channel simulator simulates a channel type, multipath information and Doppler frequency offset required by non-cooperative detection and reception, and respectively sends obtained OFDM communication signals to the cooperative end receiver and the non-cooperative detection and reception machine; using a Kalman filter to clean and retain the intercepted OFDM communication signal meeting the amplitude threshold, calculating the signal power of which the score meets the task requirement, and adding Gaussian white noise to obtain a target OFDM communication signal; the method comprises the following steps: storing an OFDM communication signal data set in a pickle format through python; according to the invention, the production of the OFDM communication signal data set is realized.

The invention discloses a phased-array antenna beam forming test method in a darkroom-free environment, and relates to the technical field of satellite communication terminal complete machine testing, comprising the steps of initializing test system configuration, setting test parameters, initializing an antenna state, establishing a test environment, and connecting a test antenna with a channel simulator; cross coupling of non-corresponding channels is isolated and reduced through an algorithm, a signal transmission link between a test antenna and a tested antenna is established through a wireless channel by adopting a virtual wire connection mode, non-contact test is realized, beam forming test is performed, a mobile station moves to a preset test area, impedance of the test antenna is adjusted by adopting an electronic tuning mode, and the antenna is tested. The beam former realizes independent control of an uplink and a downlink, analyzes a test result and generates a report, does not need to depend on fixed test facilities such as a microwave anechoic chamber and a calibration tower, can directly test in an actual working scene, and is particularly suitable for field test of mobile equipment such as a large vehicle-mounted phased array system.

The present invention discloses a USRP satellite communication simulation system based on iterative and stable prediction of communication states, belonging to the field of mobile communication technology. The system comprises a simulation system and a hardware-in-the-loop access system. The simulation system includes a USRP device, a channel simulator, and a ground gateway device. The channel simulator runs simulation software. The USRP device simulates the communication behavior of the satellite and payload. The channel simulator simulates the actual channel environment and electromagnetic interference. The simulation system models and simulates the behavior of the satellite, payload, communication link, core network, and ground gateway, generating experimental data, performance indicators, and statistical results. The hardware-in-the-loop access system displays the hardware-in-the-loop communication status based on the channel environment and satellite data provided by the simulation system. This system allows users to experience the true experience of satellite internet through simulated terminal communications and data services.

The invention discloses a control method and system of a channel simulator and a related device, and relates to the technical field of wireless communication, and the method comprises the steps: obtaining a target configuration file matched with a current operating system, generating a simulation control instruction based on the target configuration file, and transmitting the simulation control instruction to the channel simulator through a target interface, and the channel simulator carries out channel transmission simulation based on the simulation control instruction to obtain performance statistical data generated in the channel transmission simulation process, and the configuration parameters are adjusted under the condition that the performance statistical data returned by the channel simulator through the target interface does not meet the requirement, so that the channel transmission simulation is realized. And returning to obtain the target configuration file adaptive to the current operating system until the performance statistical data meets the requirement. According to the method, the target interface with the data transmission rate larger than the preset threshold value is adopted for transmitting the data, real-time data transmission is achieved, the target configuration file matched with the current operation system is developed based on the QT tool, cross-platform adaptability is improved, and operation complexity is reduced.

The embodiment of the invention provides a communication perception test method and a channel simulator. The method comprises the following steps: modeling all perception objects in a simulation scene to obtain a plurality of perception object models corresponding to the simulation scene; determining channel parameters corresponding to the simulation scene according to scene parameters corresponding to the simulation scene, sensing object parameters, input sensing signal transmitting end parameters and the plurality of sensing object models; and performing signal processing on the initial sensing signal corresponding to the simulation scene according to the channel parameter, and returning the initial sensing signal subjected to signal processing to a sensing signal sending end to perform communication sensing test. Therefore, the problem that a communication sensing test scheme in the related technology cannot comprehensively meet the requirements of practicability, economy and complexity of highly simulating a real environment can be solved, and the effect of improving the communication sensing test efficiency is achieved.

The application discloses an OFDM high-order modulation signal recognition method based on adaptive data preprocessing and an adaptive wavelet Mamba algorithm, solves how to classify OFDM signals under unknown channel parameters, Doppler frequency shift and complex multipath propagation conditions, and belongs to the field of modulation carriers; the method comprises the following steps: storing OFDM modulation signals as IQ files by simulating actual communication environments through a physical channel simulator; calculating a stable interval of the IQ files by using a steady-state distribution method, cleaning and retaining target samples whose amplitudes meet a threshold; dividing the target samples into sub-blocks, reconstructing the sub-blocks into a structured three-dimensional matrix, and dividing the three-dimensional matrix into a training set and a test set; constructing an AWM from sequentially connected convolution layers, a wavelet transform module, a frequency band perception module, an adaptive gating fusion mechanism module and a fully connected layer; obtaining the trained AWM from the training set; and identifying OFDM high-order modulation signals through the test set; and the application realizes OFDM signal high-order modulation classification.

The invention relates to a method for simulating Doppler diffusion and multipath time delay of a wireless channel, belongs to the field of wireless communication channel simulation, and is used for simulating Doppler diffusion and multipath time delay of a Rayleigh channel. According to the method, the maximum number of sine waves of a channel simulator is expanded through a time division multiplexing Cordic calculation module, a limited number of sine waves are superposed to generate a channel envelope, the channel sampling rate is improved through a CIC interpolation filter, fractional time delay in a wireless channel is simulated through a Farrow structure filter based on Lagrange interpolation, and the frequency of the wireless channel is improved. Therefore, the multi-path number is flexibly expanded, the resource consumption is reduced, the channel simulation precision and the sampling rate are improved, and the multi-path fractional time delay is flexibly simulated. Compared with an ROM table look-up method, the method has the advantages of being low in resource consumption, high in channel simulation precision, easy to implement and deploy and the like, and is suitable for the fields of wireless communication channel simulators, signal processing and the like.