24 results about "Communication reception" patented technology

The application discloses a frame synchronization-based laser communication and ranging integrated system, and belongs to the technical field of satellite laser communication.The system solves the problem that ranging precision is limited under the condition of low communication rate.The system comprises a sending end and a receiving end, wherein the sending end comprises a synchronization header sequence generating module, a data sequence generating module and a framing module, the receiving end comprises a synchronization sliding correlation / rough ranging calculation module, a fine ranging calculation module and a data sequence extracting module; the synchronization header sequence generating module generates a synchronization header sequence, the data sequence generating module generates a data sequence, and the framing module completes splicing of the synchronization header sequence and the data sequence; the synchronization sliding correlation / rough ranging calculation module performs frame synchronization and calculates an integer symbol period of transmission delay, the fine ranging calculation module calculates a fractional symbol period of transmission delay, and the data sequence extracting module performs frame disassembly according to a starting position of the synchronization header sequence, extracts the data sequence and completes communication reception.

The embodiment of the invention provides a communication and sensing integrated device and a working method thereof, and belongs to the technical field of wireless communication and radar sensing fusion, and the device comprises a millimeter wave digital processing module, a communication module, a communication and sensing link and an antenna array plane, wherein the millimeter wave digital processing module is used for receiving a reference clock signal of an external baseband processing unit, generating a reference signal and simultaneously processing a communication signal and a radar signal; the sensing link comprises M communication links and N radar links, each communication link comprises a communication transmitting branch and a communication receiving branch, and each radar link comprises a radar transmitting branch and a radar receiving branch; uploading the radar data to a public network in an independent networking mode; the antenna array plane is connected with the communication link through the first channel and connected with the radar link through the second channel, the first channel and the second channel achieve time division multiplexing through the change-over switch, the communication and sensing cooperation efficiency is improved through hardware multiplexing and intelligent switching, and meanwhile the system complexity and cost are reduced.

The present invention provides a working method for a communication perception symbiotic system, which belongs to the field of communication perception integrated architecture and digital signal processing. The method includes establishing a communication signal transmission model based on the communication perception symbiotic system; performing communication reception signal processing at the communication user; establishing a perception signal model in the communication perception symbiotic system; performing perception echo signal processing at the perception node, and using the communication perception integrated signal to provide communication services to Internet of Vehicles users. The perception node uses dimensionality reduction maximum likelihood estimation based on the perception echo signal to achieve perception of the communication user and the perception target; and feeding back the perception results obtained by the perception node to the base station to assist in realizing the design of the downlink communication perception integrated signal at the next moment. The present invention can effectively avoid the problem of perception performance degradation caused by self-interference problems and effectively reduce hardware costs and energy consumption.

The present invention discloses a cloud computing platform virtual private network system and a network control method. The system includes at least two physical machines and a router; each physical machine realizes the connection of a virtual private network through a router; each physical machine includes a physical network card, a flow controller and at least one virtual machine; the physical network card records the network address of each virtual machine in the physical machine, and the virtual machine accesses the virtual private network through the physical network card on the physical machine; the physical network card also includes a routing access table, and the routing access table records the network address of other virtual machines in the virtual private network. The flow controller is used to control the communication initiation and communication reception of each virtual machine on the physical machine. The present invention reduces the number of times the router ARP routing table is traversed and shares the workload of the router through the design of the routing access table and the flow controller; at the same time, the security protection capability of the virtual private network system itself and the ability to quickly cut off the flow when encountering an attack are greatly improved.

The invention discloses a short-wave communication equalization method and system based on decision feedback iteration, and the method specifically comprises the steps: enabling a transmitting end to carry out the coding, interweaving and mapping of data information, generating a plurality of unknown data blocks, enabling known data sequences to be inserted between the unknown data blocks at intervals, forming a data segment sequence, and transmitting the data segment sequence to a receiving end through a channel; a receiving end extracts known data sub-segments and sends the known data sub-segments to a channel estimation module to estimate channel impulse response, the known data sub-segments and unknown data sub-segments extracted by the receiving end are sent to a first equalizer at the same time for segment-by-segment equalization, and then LLR calculation, de-interleaving and decoding are carried out; judging whether the decoding result meets an iteration ending condition or not, and if yes, ending iteration; and otherwise, coding, interleaving and mapping a decoding result, dividing a mapping result into mapping sub-segments, inputting the mapping sub-segments as initial values of iteration into a second equalizer for segment-by-segment equalization, and then performing LLR calculation, de-interleaving and decoding processes until iteration is finished. The short-wave communication receiving performance is improved, the operand is low, and the numerical calculation stability is good.

Certain aspects of the present disclosure provide techniques for wireless communications. An example method includes receiving first downlink control information (DCI) indicating a first quantity of antennas for downlink communication reception, wherein the first quantity of antennas is associated with a first application timeline; receiving, after receiving the first DCI and within the first application timeline, second DCI indicating a second quantity of antennas for downlink communication reception, wherein the second quantity of antennas is associated with a second application timeline; and receiving a downlink communication using the first quantity of antennas or using the second quantity of antennas based at least in part on timing of the downlink communication relative to at least one of the first application timeline or the second application timeline.

Certain aspects of the present disclosure provide techniques for wireless communications. An example method includes receiving first downlink control information (DCI) indicating a first quantity of antennas for downlink communication reception, wherein the first quantity of antennas is associated with a first application timeline; receiving, after receiving the first DCI and within the first application timeline, second DCI indicating a second quantity of antennas for downlink communication reception, wherein the second quantity of antennas is associated with a second application timeline; and receiving a downlink communication using the first quantity of antennas or using the second quantity of antennas based at least in part on timing of the downlink communication relative to at least one of the first application timeline or the second application timeline.

The invention discloses a multi-user random access transmission method, and belongs to the technical field of wireless communication receiving. The method comprises the steps that in a set scene, a system randomly generates a switching mode to be bound with an access user in advance, and the user can perform data transmission in a specified time slot by using the switching mode. The system selects the modulation mode of the user according to the range of the number of active users, and a receiving end can realize symbol detection and decoding of any modulation mode. Compared with an existing ODMA system multi-user detection and decoding scheme, the method has the advantages that a receiving end can perform user identity recognition according to a switching mode through pre-binding of the switching mode and the user, the adaptive modulation mode enables the transmission symbol length to be reduced when the user transmits bit data with the same length, the user access density is reduced, and the decoding efficiency is improved. The ultra-sparse characteristic of the system is guaranteed, interference caused by superposition of other user information is reduced, and therefore the detection and decoding performance of a receiving end is improved, the system supports larger-scale connection, and obvious performance gain can be obtained in medium and high user areas.

The present invention discloses a method, device, equipment, medium and product for processing inter-train communication data. The method includes: during the current train's travel, when receiving the first train-to-train communication data, collecting the current train's receiving position information and receiving timestamp; collecting the current train's signal association information; determining the communication reception record based on the first train-to-train communication data, receiving timestamp, receiving position information and signal association information, and storing the communication reception record in association with the reception record identifier; when obtaining the second train-to-train communication data to be sent, collecting the current train's sending position information and sending timestamp; determining the communication sending record based on the second train-to-train communication data, sending timestamp and sending position information, and storing the communication sending record in association with the sending record identifier. This technical solution achieves the effect of real-time recording and storage of train-to-train communication data related to communication fault analysis during train operation.

The invention discloses an inter-satellite laser communication tracking integrated device and method, and relates to the technical field of laser communication. The device comprises a master control subsystem, a tracking subsystem, a light splitting isolation subsystem and a signal processing subsystem, and the tracking subsystem is used for performing phase shift processing on received signal light beams and outputting multiple paths of first light beams with consistent phases; the light splitting isolation subsystem is used for filtering each path of first light beam and outputting multiple paths of second light beams; the signal processing subsystem comprises a signal processing module, a communication module and a tracking module, the signal processing module mixes the local oscillator light beam and the second light beam and then generates multiple paths of second digital signals through multiple times of conversion, the second digital signals are divided into communication signals and tracking signals, and the communication module realizes communication receiving based on each path of communication signals. And the tracking module feeds back phase difference information between two adjacent paths of tracking signals to the master control subsystem. By adopting the device, stable communication with corresponding communication equipment can be realized.

The invention discloses a real-time FADEC operating system transplantation method which comprises the following steps: determining a selected hardware processor model and a specific operating system kernel according to FADEC control software performance requirements; the method comprises the following steps: dividing interfaces of an application software layer and an operating system layer in FADEC control software, and modifying an initial starting part code of operating system software according to a selected processor model and an operating system kernel, including adjusting operating system kernel codes of different processor chips and software and hardware configuration in an initialization process; based on the defined interface, packaging the driving equipment before transplantation; the initialization code and the packaging interface function are combined, transplanted operating system software is obtained, an application layer interface is not changed, and the development process of the FADEC control software is completed; debugging and verifying power-on initialization, signal input and output, communication receiving and sending, task allowance and an abnormal response mechanism, and judging whether requirements are met or not according to verification results; the demand tracing error rate is reduced, and the research and development efficiency is improved.

The application relates to a bit synchronization performance enhancement method for a non-continuous wave communication receiving link, which comprises the following steps: performing frame synchronization on a receiving signal frame to determine the starting position of a frame header sample point; performing frequency offset estimation based on the frame header sample point, and performing frequency offset compensation on the receiving signal frame according to the estimation result; embedding a set number of redundant sample points before the starting position of the frame header sample point of the receiving signal frame after the frequency offset compensation, and performing bit synchronization on the generated signal frame to obtain a processing signal frame; and removing the bit-synchronized redundant sample points from the processing signal frame to obtain a bit-synchronized receiving signal frame. The application can effectively solve the performance loss problem caused by the bit synchronization convergence process in the non-continuous wave scene, and greatly reduces the complexity of high-throughput satellite communication receiving.

This application relates to a low-speed satellite laser communication system and method, belonging to the field of laser communication technology. The low-speed satellite laser communication system includes an optomechanical unit and an electronic unit. The transceiver module of the optomechanical unit adopts a common aperture design. A single quadrant avalanche photodiode is placed at the focal plane of the common aperture optical antenna in the receiving optical path to convert the optical signal into four electrical signals. The signal detection module of the electronic unit is connected to the quadrant avalanche photodiode to preprocess the four electrical signals, separating the position detection signal and the communication signal. The main control communication module processes the communication signal to recover data and generates tracking commands based on the position detection signal. The fast-reflecting mirror in the optomechanical unit is controlled by a fast-reflecting mirror drive module. This application achieves both communication reception and precise tracking functions simultaneously using a single QAPD detector, significantly reducing the terminal size, weight, and power consumption, making it suitable for microsatellite platforms.

The application discloses an inter-satellite laser communication and tracking integrated device and method, and relates to the technical field of laser communication.The device comprises a general control subsystem, a tracking subsystem, a light splitting and isolation subsystem and a signal processing subsystem.The tracking subsystem is used for performing phase shift processing on the received signal light beam and outputting a plurality of first light beams with consistent phases.The light splitting and isolation subsystem is used for performing filtering processing on the first light beams and outputting a plurality of second light beams.The signal processing subsystem comprises a signal processing module, a communication module and a tracking module.The signal processing module generates a plurality of second digital signals through multiple conversions after mixing the local light beam with the second light beam.The second digital signals are branched into communication signals and tracking signals.The communication module realizes communication reception based on the communication signals.The tracking module feeds back phase difference information between adjacent two tracking signals to the general control subsystem.The above device can realize stable communication with corresponding communication equipment.

This invention discloses a shortwave communication equalization method and system based on decision feedback iteration. Specifically, the transmitting end encodes, interleaves, and maps data information to generate multiple unknown data blocks. Known data sequences are interleaved and inserted between the unknown data blocks to form a data segment sequence, which is then transmitted to the receiving end via the channel. The receiving end extracts known data segments and sends them to a channel estimation module to estimate the channel impulse response. These segments, along with the extracted unknown data segments, are simultaneously sent to a first equalizer for segment-by-segment equalization, followed by LLR calculation, deinterleaving, and decoding. The decoding result is then determined to satisfy the iteration termination condition; if so, the iteration ends. Otherwise, the decoding result is encoded, interleaved, and mapped. The mapped result is divided into mapped segments, which are used as the initial values ​​for iteration and input to a second equalizer for segment-by-segment equalization. The LLR calculation, deinterleaving, and decoding process is then repeated until the iteration ends. This invention improves shortwave communication reception performance, has low computational complexity, and exhibits good numerical computation stability.

This application provides a satellite-based laser communication adjustment method, apparatus, electronic device, and medium, relating to the field of satellite communication technology. The satellite-based laser communication adjustment method provided by this application includes: acquiring a first position of a first target satellite and historical laser communication information of a second target satellite; determining the laser communication movement path corresponding to the second target satellite based on the historical laser communication information and the first position; acquiring the laser communication reception standard of the laser communication receiving terminal corresponding to the first target satellite; determining laser communication reception adjustment information corresponding to the first target satellite based on the laser communication movement path and the laser communication reception standard; and adjusting the receiving angle of the laser communication receiving terminal based on the laser communication reception adjustment information. This application can reduce the impact of satellite jitter on the stability of inter-satellite laser communication.

The present invention discloses a system and method for preventing mismatches in backup automatic starters at different voltage levels. The system comprises a high-voltage backup automatic starter and a low-voltage backup automatic starter. The high-voltage backup automatic starter comprises a timing mode conversion module and a communication transmission module, while the low-voltage backup automatic starter comprises a communication reception module and a timing mode adjustment module. Through information exchange between backup automatic starters at different voltage levels, synchronization of the timing modes of the program timers of the backup automatic starters at multiple different voltage levels is achieved. This solves the technical problem of some backup automatic starters preemptively operating after a system failure due to differences in the timing modes of the program timers of the backup automatic starters at multiple different voltage levels. This avoids confusion in the order of backup automatic starter operations after a system failure, achieves a multi-level backup automatic starter redundant configuration for load recovery, and improves system power supply reliability.

The invention discloses a laser communication and distance measurement integrated system based on frame synchronization, and belongs to the technical field of satellite laser communication. The problem that the ranging precision is limited under the condition that the communication rate is low is solved. The system comprises a sending end and a receiving end, the sending end comprises a synchronous head sequence generation module, a data sequence generation module and a framing module, and the receiving end comprises a synchronous sliding correlation / coarse ranging calculation module, a fine ranging calculation module and a data sequence extraction module. The synchronization head sequence generation module generates a synchronization head sequence, the data sequence generation module generates a data sequence, and the framing module completes assembly of the synchronization head sequence and the data sequence; the synchronous sliding correlation / coarse ranging calculation module carries out frame synchronization and calculates an integer code element period of transmission delay, the fine ranging calculation module calculates a small code element period of transmission delay, and the data sequence extraction module carries out frame splitting according to the initial position of a synchronous head sequence, extracts a data sequence and completes communication receiving.

The present invention discloses a radar communication integrated transmission method based on USRP, and relates to the field of signal processing. The present invention realizes the transmission and receiving process of radar communication integration based on USRP signal transmission module and USRP signal receiving module; when transmitting, first start the USRP transmission session, then configure the transmission parameters, load the radar communication integrated waveform, and use the USRP transmission waveform; when receiving, start the USRP reception session, configure the reception parameters, use the USRP reception waveform, if it is communication reception, perform communication reception processing and output the constellation diagram and communication data, if it is radar reception, perform radar reception processing and output the detection parameters and detection results. The present invention can be used for target perception detection and communication, and can add radar detection function to the system without losing communication performance.

The invention relates to the technical field of communication receiving, in particular to a multi-LED visible light communication receiving device and a dimming control method. The multi-LED visible light communication receiving device comprises a high-sensitivity photoelectric conversion module, a multiplexing module, a signal processing module, a decoding module, an anti-interference module and a synchronization module; by integrating an optical filter, an intelligent reflecting surface and a self-adaptive clock synchronization unit, the signal-to-noise ratio is remarkably improved, ambient light interference and inter-symbol interference are reduced, generalized dimming control and an asymmetric power distribution algorithm are adopted, collaborative optimization of brightness and communication performance is achieved, energy efficiency is improved, independent control of multiple paths of LEDs is supported, and different scene requirements are met; and the flexible receiving device supports curved surface installation, integrates a self-inspection and fault prediction module, triggers a maintenance instruction in advance, improves the stability of the system and prolongs the service life of the system.

Provided are a base station, whereby the erroneous detection of control information can be reduced, thereby preventing the degradation of the system throughput. A base station maps a downstream allocation control information unit, which is addressed to a terminal, to a first resource region, which can be used for any of a downstream control channel region and a downstream data channel region, or to a second resource region, which can be used only for the downstream control channel, so as to transmit the downstream allocation control information unit. In the base station, a control unit establishes a scale of the PDCCH region, and a transmission region establishing unit establishes, on the basis of a scale value established by the control unit, a mapping region to which the DCI is mapped within the R-PDCCH region and the PDCCH region.

The present invention relates to a method for tracking and suppressing phase noise trajectories. The method includes: Step 1, mathematically characterizing the communication transmission signal, wireless propagation channel, and communication reception signal of a frequency-hopping cooperative system; Step 2, at the communication receiver, estimating the average channel fading and phase noise value in a synchronous hop, and performing phase noise trajectory tracking and suppression on the signal hop. The present invention uses synchronous hop information to estimate the phase noise trajectory of the signal hop, can effectively suppress the phase noise in the transmitter and receiver frequency oscillators, and has important guiding significance for suppressing radio frequency hardware errors in practical engineering.

The invention discloses a terminal state conversion method and device and a terminal, and the conversion method comprises the steps: converting the terminal in a first state into a second state under the condition that a first condition is satisfied; wherein the second state is an idle state, a connected state or an inactive state; the communication power consumption of the terminal in the first state is smaller than that of the terminal in the second state; according to the embodiment of the invention, the first state is introduced, the terminal can greatly reduce the power consumption of communication receiving in the first state, and through defining the first condition for triggering the terminal to be converted from the first state to the second state (i.e., the non-first state), the purpose of saving power of the terminal is achieved on the premise that the terminal is guaranteed to be reliable enough in communication quality.

The invention provides a satellite-based laser communication adjustment method and device, electronic equipment and a medium, and relates to the technical field of satellite communication. The satellite-based laser communication adjustment method provided by the invention comprises the following steps: acquiring a first position of a first target satellite and historical laser communication information of a second target satellite; determining a laser communication moving path corresponding to the second target satellite based on the historical laser communication information and the first position; acquiring a laser communication receiving standard of a laser communication receiving terminal corresponding to the first target satellite; and determining laser communication receiving adjustment information corresponding to the first target satellite based on the laser communication moving path and the laser communication receiving standard, and performing receiving angle adjustment on the laser communication receiving terminal based on the laser communication receiving adjustment information. According to the invention, the influence of satellite jitter on the stability of laser communication between satellites can be reduced.