27 results about "Channel simulator" patented technology

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.

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 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.

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 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 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 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 invention relates to a novel 6G seaborne unmanned system environment sensing channel modeling method and system. The method comprises the steps that 1, a seaborne unmanned system communication framework formed by a seaborne unmanned aerial vehicle to multiple unmanned ships and a seaborne unmanned ship to unmanned ships is built; 2, a channel coefficient generation method is built; comprising the steps of generating a channel impulse response, generating an unmanned aerial vehicle random trajectory, generating an unmanned ship random trajectory, generating an evaporation waveguide model, generating small-scale parameters and updating the small-scale parameters. Step 3, constructing a channel simulator system based on hardware implementation of an FPGA (Field Programmable Gate Array); and step 4, calculating channel statistical characteristics, wherein the channel statistical characteristics comprise time delay power spectrum density, a space-time correlation function, a stationary interval, root-mean-square time delay spread and channel matrix colinearity. According to the invention, the channel can better simulate the real environment over the ocean, so that model construction and characteristic analysis can be more accurately carried out.

The application provides a LISP protocol-based air telecommunication network ground-air data link switching delay test method, relates to the field of civil aviation communication, and solves the problems of long time consumption, complex equipment and high cost of the traditional actual flight method; the method comprises the following steps: building a test platform, including corresponding equipment of at least two sets of ground-air communication systems for realizing link switching operation; configuring LISP protocol for various types of routers in the test platform, and determining a preferred ground-air communication link; configuring a channel simulator to simulate the signal transmission environment of the flight process and connect the equipment; starting the preferred ground-air communication link, and sending test data through a computer simulation; closing the preferred ground-air communication link, automatically switching to an alternative ground-air communication link, capturing corresponding data packets through a router packet capturing mode, and calculating the ground-air data link switching delay; and the application can complete the test in a laboratory environment, so that the test process has the characteristics of high efficiency and low cost.

This invention discloses a multi-node optimization method for power control links in a channel simulator based on carrier-to-noise ratio (CNR) measurement, belonging to the field of channel simulation technology. This method aims to solve the simulation distortion problem that occurs when using low CNR signals as input for channel characteristic simulation. The key technical points are: measuring the gain and CNR loss of each internal module under different control commands; measuring the power and CNR of the first node of the input link, adjusting the control commands of the pre-adjustment module and post-adjustment module based on the principle of optimizing the CNR at the input port of the preprocessing module; and coordinating the noise power of the channel simulation module and the control commands of the large-range power adjustment module based on the simulation scenario to match the power and CNR of the output signal with the simulation requirements. This invention achieves high-fidelity channel simulation for low CNR input signals, expanding the applicable scenarios of channel simulators.

The application discloses an OFDM communication signal dataset manufacturing method based on FPGA and programmable interception, solves the problems of few label dimensions and lack of OFDM communication system in current communication signal datasets, and belongs to the field of computer vision; the method comprises the following steps: adopting an FPGA device as a transmitter, a cooperative terminal receiver and a non-cooperative detection receiver; a channel simulator simulates the channel type, multipath information and Doppler frequency offset required by non-cooperative detection, and sends the obtained OFDM communication signals to the cooperative terminal receiver and the non-cooperative detection receiver; a Kalman filter is used to clean and retain the intercepted OFDM communication signals meeting the amplitude threshold, the signal power meeting the task requirement is calculated, Gaussian white noise is added to obtain a target OFDM communication signal; the OFDM communication signal dataset is stored in a pickle format through python; and the application realizes the manufacturing of the OFDM communication signal dataset.

The invention discloses a digital channel simulation system for satellite-ground link simulation based on digital twinning, and the system is characterized in that a digital channel simulator receives configuration information sent by a simulation operation platform, receives ephemeris information pushed by a digital satellite model, and obtains channel simulation parameters carried in a target message; determining measurement information based on the configuration information, the ephemeris information and the channel simulation parameters; wherein the measurement information comprises a signal to interference plus noise ratio (SINR), a received signal strength indicator (RSSI), Doppler frequency offset, time offset and a carrier-to-interference ratio (C / I). According to the SINR and an SINR-block bit error rate (BLER) mapping curve generated by off-line simulation, determining a BLER corresponding to the SINR; and determining a cyclic redundancy check (CRC) result based on the BLER. And the simulation precision and the calculation efficiency are balanced.

The application relates to a test method, system and device for communication and sensing integration and a storage medium. The method determines a target test mode according to the access of a user and a sensing target to a communication and sensing integration test system, controls a target test device corresponding to the target test mode to perform a test, and obtains a test result. The target test mode includes any one of a beam test mode, a sensing test mode, a communication test mode and a communication and sensing integration test mode, and the target test device includes at least two of a signal generator, a spectrum analyzer, a phase shifter, a echo simulator and a channel simulator. The method realizes an automatic test method based on simulation of a real scene in a laboratory for a communication and sensing integration key technology, can realize communication and sensing integration test covering different scenes such as low altitude, aviation, sea area and ground-to-air, and can greatly reduce test cost and improve test efficiency.

1. The name of the design product: wireless space channel simulator. 2. The use of the design product: space environment simulation of low-orbit satellite wireless communication. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

The application relates to a method suitable for MIMO channel simulator to realize in-band amplitude and phase flatness calibration, which comprises the following steps: generating a known comb spectrum signal through an internal DAC, connecting to a signal analyzer after passing through a radio frequency channel to collect and analyze the IQ signal, and completing amplitude and phase compensation data calculation of all M transmitting ports; configuring the channel simulator as a MIMO N*1 mode, taking one transmitting channel TX after the first stage calibration as a transparent channel, and calculating amplitude and phase compensation data of all N receiving ports. The method, device, processor and computer readable storage medium thereof suitable for MIMO channel simulator to realize in-band amplitude and phase flatness calibration can realize comprehensive amplitude and phase calibration, realize in-band amplitude and phase flatness calibration of the radio frequency channel of the MIMO channel simulator, effectively improve the system signal-to-noise ratio, and maximally reduce the influence of hardware on channel simulation; can reduce the system cost and the requirement for instruments, and reduce the overall cost of the calibration system.

The utility model discloses a self-adaptive topological structure based on a wireless space channel simulator. The self-adaptive topological structure comprises an upper computer unit, a channel simulation platform, a built-in satellite signal source and a radio frequency conversion unit, the channel simulation platform is respectively connected with the upper computer unit and the built-in satellite signal source; the other end of the built-in satellite signal source is connected with the radio frequency conversion unit; the channel simulation platform adopts the combination design of FPGA modules such as a radio frequency signal preprocessing module, a multipath fading simulation module, a multipath time delay simulation module and a channel superposition simulation module. Through the above design, the stable and reliable performance of the channel simulation FPGA module is firstly ensured, and flexible cascade configuration of a plurality of channel simulation FPGA modules can be carried out according to parameters such as bandwidth, multipath number, complexity of a channel model and the like, so that different radio frequency modules and FPGA modules are flexibly used on the premise of not changing software of an upper computer, and the reliability of the channel simulation FPGA module is improved. Therefore, the requirements of different application scenes or the requirements of the same application scene in different stages can be met.

The invention belongs to the technical field of satellite communication, and provides a satellite communication semi-physical simulation system and method for a low-orbit giant satellite base, and the technical scheme is that the satellite communication semi-physical simulation system comprises a simulation server cluster and a physical test system, and the physical test system comprises a satellite communication load model machine, a ground communication terminal model machine and a satellite channel simulator; the ground communication terminal model machine and the satellite channel simulator are respectively connected to the simulation server cluster through the switch, one end of the satellite communication load model machine is connected to the simulation server cluster through the interface conversion equipment and the switch, and the other end of the satellite communication load model machine is connected with the ground communication terminal model machine through the satellite channel simulator; and the plurality of satellite communication load model machines are connected through the satellite channel simulator. Performance simulation evaluation of the satellite-ground communication network and the inter-satellite communication network can be realized at the same time.

The application discloses a satellite beam hopping verification device and method based on a wireless channel simulator, and comprises the following steps: presetting all beam position information at a base station and a wireless channel simulator; presetting a terminal to be accessed at a wireless channel simulator master control module; starting a satellite-ground beam hopping simulation according to satellite ephemeris information by a simulation system; scanning the beam position by the base station through ephemeris, obtaining beam control information and transmitting the beam control information to the wireless channel simulator; calculating whether the preset terminal beam position is scanned by the current beam according to the ephemeris information and the beam control information, if yes, opening a connection channel between the base station side beam and the terminal by the simulator, and if not, closing the connection channel between the current beam and the preset terminal; and completing the satellite beam hopping verification based on the wireless channel simulator through ephemeris simulation. The application can realize the satellite beam hopping verification strategy quickly without the participation of a phased array antenna.

The invention discloses a test system and a test method for a bee colony communication interaction module of an unmanned aerial vehicle, and the test system is composed of a network analyzer, a channel simulator and a comprehensive test terminal. Therefore, the test system can simply and accurately combine with an actual use scene to comprehensively and accurately test the communication interaction module in multiple dimensions, and the effectiveness, authenticity and comprehensiveness of the test of the communication interaction module are finally improved.

The invention discloses a device and a method for calibrating multipath delay parameters of a channel simulator, and relates to the technical field of wireless communication. Comprising an arbitrary waveform generator, an up-converter, a power divider, a channel simulator, a digital oscilloscope, a reference clock, a computer and a calibration reference plane. The method can avoid or improve the defects of the time domain pulse technology for calibrating the multipath delay parameter of the channel simulator, and provides a channel simulator multipath delay parameter calibration result with higher precision and larger bandwidth for the fields of broadband digital communication, 5G / 6G communication, radar signal processing, Internet of Things and the like.

The invention discloses a verification method of an infrared OCC module based on a UVM, and belongs to the technical field of chip verification. The method comprises the following steps: firstly, defining a protocol description language (PDL) to abstract an infrared Sensor interface protocol; an input storage array and a reference model of the OCCTX module are dynamically configured through a PDL analyzer, and the reference model is integrated with a configurable infrared channel simulator to simulate physical layer interference; performing fine-grained comparison on the actual output of the OCCTX and the reference output; if mismatching is detected, the intelligent diagnosis module locates an error type through matching of error features and a preset error pattern library, associates an RTL module and provides a correction suggestion; finally, according to the comparison result, the diagnosis information and the function coverage rate, PDL parameters are adjusted in a feedback mode to optimize test case coverage. According to the invention, through PDL driving, intelligent diagnosis and feedback adjustment, automation, intelligence and high efficiency of infrared OCC module verification are realized.

This invention provides a method and apparatus for calibrating the air interface cable of a multi-antenna device. Using instruments such as a channel simulator, bidirectional power amplifier, amplitude modulation and phase modulation network, anechoic chamber, probe, and turntable, combined with signal transmitting equipment such as a base station / comprehensive test instrument and the multi-antenna device under test, an air interface cable transmission channel for the signal is constructed at the antenna front end of the device under test. This supports a large number of protocol conformance, functional, and performance tests. This solution is not limited by frequency and bandwidth, nor by the model and specifications of the signal transmitting equipment and the multi-antenna device under test, and has advantages such as wide applicability and low cost.

The application discloses a kind of multi-cell OTA dynamic performance test methods, comprising the following steps: for simulating base station signal air transmission, set multiple groups of virtual probes in simulation space, each group of virtual probes is located in a beam direction, and constitutes virtual probe wall;With the input end of phase modulation network connects AAU antenna array output end, and the output signal of phase modulation network is used as virtual probe detection signal, and the amplitude and phase adjustment file of the phase modulation network is determined according to the position of virtual probe and AAU topological distribution;The input end of channel simulator is connected to the output end of the phase modulation network, and the output end of channel simulator is connected to power amplifier unit, and then radiated to terminal darkroom by dual polarization probe.This application also includes the system for realizing the method.The scheme of the application solves the problem that the cost of OTA test using channel simulator is higher, and meets the test scene of terminal high-speed movement and cell fast switching under dynamic channel scene.