28results about How to "Improve spectrum utilization" patented technology

The invention relates to the technical field of radio frequency communication control, and discloses a beam forming accurate control method, which comprises the following steps of: acquiring a business service quality parameter and frequency domain channel information of a user; generating a user priority sequence; constructing a three-dimensional resource scheduling matrix; outputting a beam forming coefficient matrix and a power distribution result; and performing beam precise closed-loop regulation and control of the radio frequency array. The technical problems in the prior art that real-time resource scheduling and fine beam regulation and control are difficult to carry out in combination with user QoS dynamic changes, and stable beam forming control is difficult to realize especially in a scene that a chip supporting large-scale user concurrency needs to dynamically adjust beams according to QoS requirements are solved. According to the invention, the dynamic resource scheduling matrix fused with power perception is constructed, and a multi-dimensional feedback calibration mechanism based on amplitude-phase perturbation is combined, so that high-precision beam control is realized, and the communication stability and the regulation and control flexibility are improved.

The application provides an AM-PM distortion calibration method applied to an UWB transmitter and belongs to the field of UWB communication. The method adds a sampling resistor between a linear voltage stabilizing power supply LDO and a digital power amplifier DPA driving stage of the UWB transmitter using a digital power amplifier, so as to simulate the instantaneous change of the power supply voltage of the DPA driving stage when the UWB pulse is transmitted; an adjustable delay unit is added between a carrier input port LO and the DPA driving stage; the continuous sine wave is transmitted, the phase information under each digital baseband amplitude control word is collected to form original data of the AM-PM distortion of the UWB transmitter, the digital baseband output AM-PM control word is used to control the adjustable delay unit to output the phase which is opposite to the original data and has the same size, so that the phase predistortion of the transmitted UWB pulse is realized, and the AM-PM distortion calibration is completed. The application has the advantages of simple implementation and strong compensation capacity.

The application belongs to the technical field of radar signal processing and imaging, and provides a differential coupling single-frequency time-varying low-quantization imaging method, which comprises receiving a SAR echo signal, constructing a single-frequency time-varying threshold signal, single-bit quantization processing of a reference channel, single-bit quantization processing of a phase shift channel, double-channel data fusion and harmonic cancellation, and imaging processing based on a synthesized signal. The application effectively reduces the quantization noise base and improves the detection capability of a SAR system on weak targets under the premise of not significantly increasing the hardware cost.

This invention discloses an HPAM-DMT-NOMA method based on time-domain preprocessing, comprising: At the transmitting end, PAM modulation is performed on the input user transmission bits to generate PAM symbols; after power superposition, serial-to-parallel conversion, and Hermitian symmetry, the symbols are allocated to two signal components for HPAM-DMT transmission; the frequency domain signals of PAM-DMT and RPAM-DMT are calculated; an IFFT operation is performed to obtain the time domain signal; the time-domain preprocessed signal is calculated; the RPAM-DMT time domain signal is calculated and superimposed on the clipped PAM-DMT signal for synchronous transmission to obtain a mixed signal; a reconstructed signal is introduced, processed, and input to drive an LED for illumination; at the receiving end, the received signal is processed to generate a frequency domain signal, and finally, the multi-user signal is recovered. This scheme eliminates clipping noise interference between the mixed signal components, avoids error propagation problems, and achieves high spectral efficiency and power efficiency.

This invention provides a UAV power emergency communication and resource collaborative scheduling system, relating to the field of wireless communication technology. Through system initialization, data acquisition and hierarchical coding, satellite-to-ground link establishment, NOMA access and scheduling modeling, resource collaborative configuration model establishment, joint optimization solution, online collaborative execution, and anomaly response, it achieves dynamic resource scheduling and optimization, offering advantages such as efficient collaborative resource scheduling, improved spectrum utilization, optimized energy use, guaranteed access to key nodes, and enhanced system reliability and response speed.

The application discloses a laser microwave hybrid communication adaptive modulation method based on machine learning, comprising: acquiring a weather data set, and establishing a channel state set according to weather data in the weather data set; training a random forest model RFM by using the weather data set and the channel state set, and obtaining the trained random forest model RFM; acquiring real-time weather data, inputting the weather data into the trained random forest model RFM, and obtaining a current optimal channel state D i ; judging whether an average error rate P i under the current channel state D e is less than a target error rate P e,obj , if not, adjusting the random forest model RFM until the current average error rate P e is less than the target error rate P e,obj , and simultaneously judging whether the currently executed channel state is consistent with the optimal channel state, if not, executing channel state switching, and completing switching of the laser microwave hybrid link. The influence of bad weather on the channel is reduced, and the communication efficiency is improved.

The invention provides a radio access network intelligent controller (RIC), a dynamic resource block (RB) configuration method and a base station for dynamically configuring resource blocks. A plurality of base stations (BSs) continuously receive network state information from a plurality of associated UEs and transmit the network state information to the RIC. The RIC obtains network state information corresponding to a plurality of user equipments (UEs) from the plurality of BSs; the RIC identifies at least one interfered first UE in the plurality of UEs based on the network state information; the RIC sets a plurality of dynamic RB allocation strategies corresponding to the plurality of BSs based on the network state information, the at least one first UE and the at least one first BS; in response to receiving a dynamic RB allocation policy from an RIC, a plurality of BSs divide a plurality of dominant RBs into a plurality of first RB groups and a second RB group, thereby generating transmission resource allocation information corresponding to a plurality of UEs, so that the plurality of UEs identify respective plurality of allocated RBs.

This invention discloses a method and system for low-Earth orbit (LEO) satellite communication based on dual-frequency dual-circular polarization beam scanning, relating to the field of LEO satellite communication technology. The method includes the following steps: a dual-frequency dual-circular polarization antenna unit performs identity matching verification based on satellite beacon signals transmitted by the LEO satellite to establish a communication connection with it; once the communication connection is established, the antenna unit adjusts and switches to the corresponding communication frequency based on satellite communication frequency band parameters, and simultaneously receives downlink data and transmits uplink data using dual-circular polarization mode; during data transmission, a feed phase control signal is generated based on satellite orbit parameters to adjust the beam pointing direction in real time; when the LEO satellite is about to pass over, the satellite beacon signal of the next LEO satellite is acquired to establish a communication connection and transmit data, thereby achieving seamless communication switching; through dynamic scanning and seamless switching of the dual-frequency dual-circular polarization beam, communication stability and data transmission efficiency are effectively improved.

This disclosure provides a communication method and apparatus under multiple connections. The communication method under multiple connections may include: determining a first message frame, wherein the first message frame includes first identification information for identifying a spatial stream used in a transmission operation and second identification information for identifying a spatial stream used in a reception operation, wherein the transmission operation and the reception operation are performed simultaneously on at least one pair of connections supporting simultaneous transmission and reception; and transmitting the first message frame.

This invention discloses a preamble-free access TA synchronization method and apparatus that saves time-domain resources, comprising: coarse search for candidate TAs: selecting multiple TA candidates within a preset range with a fixed step size; signal preprocessing: receiving repeatedly transmitted Msg3 frames and obtaining the frequency domain data corresponding to each TA candidate; parallel soft combining and score calculation: performing channel estimation, equalization, and descrambling on each candidate data in parallel to obtain descrambling LLR soft bits, and accumulating their absolute values ​​to calculate the synchronization score of each candidate; candidate selection and decoding verification: sorting by score and selecting high-scoring candidates for decoding and CRC verification; synchronization confirmation: using the successfully verified TA as the final synchronization quantity. This invention saves preamble time slots and response windows, significantly reducing access latency and resource consumption.

The application discloses a resource determination method and device, a terminal, a network side equipment and a storage medium, and belongs to the technical field of communication. The resource determination method of the application embodiment comprises the following steps: a terminal receives frequency domain format indication information sent by a network side equipment; the terminal determines a target transmission direction corresponding to at least one subband in a frequency domain resource unit based on the frequency domain format indication information; wherein the target transmission direction comprises an uplink direction, a downlink direction or a flexible direction; and a flexible subband with the flexible direction can be used for uplink transmission or downlink transmission.

The invention discloses an integrated optoelectronic chip applied to multiband transmission. The integrated optoelectronic chip at least comprises a supporting layer, a middle layer located on the supporting layer and a top layer located on the middle layer. The top layer comprises at least two mutually independent waveguide structures formed by different optical materials, the multi-functional integration is realized, the multiple optical materials are regionally integrated on the same chip through a CVD deposition method, the performance limitation of a single material system is broken through, and the single chip can simultaneously realize multiple functions; according to the method, multiple wavebands are compatible, photoetching and dry etching means are utilized, different materials are patterned on the same chip, different devices are prepared, simultaneous support and efficient processing of multiple communication wavebands by a single chip are achieved, the frequency spectrum utilization rate and application flexibility of the chip are greatly improved, the system architecture is simplified, the reliability is improved, and the cost is reduced. The risk of performance degradation caused by interface coupling and packaging failure is reduced, and the long-term stability of the system is improved.

The invention requests to protect a dynamic spectrum resource allocation algorithm for evaluating the risk probability of a vehicle terminal in a cognitive Internet of Vehicles. The invention provides a spectrum resource allocation algorithm which takes user risk probability as priori knowledge and takes priority as a medium. Firstly, binary modeling simplification is carried out on historical channel using behaviors of a user, then a risk assessment model of a vehicle terminal is constructed through a nonparametric Bayesian model, the risk probability of the vehicle terminal is iteratively updated, and priorities are divided according to the risk probability. Furthermore, a state space and a reward function are reconstructed by taking the maximum utilization efficiency of the spectrum and the collision probability between the vehicle terminals as guidance, and a dynamic spectrum resource allocation algorithm based on reinforcement learning is provided. Finally, the experimental result shows that the proposed algorithm can reduce the waste of spectrum resources from the source, and reduces the collision probability in the user access process while improving the utilization rate of the spectrum.

The application discloses a kind of underwater acoustic communication method, device, electronic equipment and system, the underwater acoustic communication method includes: obtaining first communication data;The first communication data is encoded by low-density parity-check code, and coding data is obtained;The carrier modulation is carried out to the coding data, and first modulation signal is obtained;The sound track angular momentum modulation is carried out to the first modulation signal, and second modulation signal is obtained;The second modulation signal is sent to receiving end by underwater acoustic channel.This application solves the technical problem that underwater acoustic communication spectrum utilization is lower.

The invention discloses a low-crosstalk long-distance sensing integrated device and a very-low-frequency sensing method, and relates to the technical field of fusion of optical fiber sensing and optical fiber communication. The device comprises a laser, a coupler, a communication modulation device, a sensing modulation device, an optical fiber transmission and relay link, a communication receiving device, a sensing receiving device and a signal processing device. The communication modulation device adopts digital subcarrier multiplexing and reserves a guard interval in a frequency spectrum center, and residual carrier filtering is combined to reduce the inductance crosstalk; the sensing modulation device realizes high-extinction-ratio pulses through a cascade light modulator, and the signal-to-noise ratio is improved. The optical fiber link adopts a bidirectional amplification relay module to synchronously amplify forward and backward signals so as to realize ultra-long distance transmission. The signal processing device carries out high-density sampling and space-time dimension fusion on the sensing beat frequency signals, and very low frequency vibration information is effectively extracted. According to the invention, common-light-source, low-crosstalk, long-distance, very-low-frequency and high-sensitivity integrated transmission and detection of communication and sensing signals are realized.

The application discloses a kind of satellite-borne four-channel Ka frequency band data transmission channel systems, it is related to satellite communication technical field, including, the original spectrum data of acquisition Ka frequency band inner frequency point, synchronous reception interference hot area database, construct original spectrum matrix, and mark interference area, generate spectrum map with interference mark;With interference mark spectrum map input pre-trained convolutional neural network, output each frequency band interference probability, and identify safe frequency band, and safe frequency band is segmented into micro sub-band, and the optimization allocation scheme is optimized by Q-learning algorithm, and the optimized spectrum configuration table is generated;According to bandwidth parameter in the optimized spectrum configuration table, dynamically adjust modulation mode, and high-speed AOS data is blocked according to frame, and network coding check package is generated in combination with channel allocation strategy in the optimized spectrum configuration table.The application improves the spectrum utilization, communication reliability and overall performance of satellite-borne Ka frequency band data transmission system under dynamic environment.

The application relates to a cross-modal generative satellite-ground network semantic communication method with super-high compression rate, which comprises the following steps: S1, establishing a generative cross-modal satellite-ground network semantic communication system; S2, establishing a satellite-ground network semantic communication system model fusing NOMA technology; S3, establishing a dynamic switching algorithm; S4, establishing a double-state satellite-ground link simulation model: considering the influence of the multipath, shadow and Doppler factors existing in satellite-ground communication, dividing the satellite-ground transmission link into two states of good and bad, modeling the channel characteristics by using Rician and Rayleigh distribution, and simulating the Doppler frequency shift through Doppler phase rotation, and completing satellite-ground channel modeling and simulation. In the single-user scene, the original image information is efficiently compressed into a compact text semantic representation through the cross-modal semantic compression module, an end-to-end generative model is adopted to guarantee high semantic consistency and robust reconstruction, the data volume is greatly compressed, and low-delay semantic transmission is achieved, so that the bandwidth burden of the satellite-ground network is effectively reduced.

The invention discloses a photon terahertz communication system based on differential Delta-Sigma modulation and independent double single side bands, and belongs to the field of terahertz communication. The system specifically comprises a transmitting end and a receiving end, a TX-DSP module of the transmitting end generates two paths of independent high-order baseband signals by applying differential DSM and independent double single side band technologies, drives an IQ modulator to modulate an input optical carrier, and obtains a terahertz signal by using a photon beat frequency method; the method comprises the following steps: transmitting a QAM sequence to an RX-DSP module at a receiving end through a single-mode optical fiber, carrying out resampling and digital down conversion to obtain two QPSK signals, respectively carrying out matched filtering, QPSK digital signal processing, hard decision, differential DSM demodulation and low-pass filtering to obtain two DMT signals, carrying out DMT demodulation again, carrying out FFT by removing a cyclic prefix, and converting a time domain signal back to a frequency domain to obtain an original QAM sequence; and the QAM sequence is demapped and recovered into an original binary information sequence. According to the invention, high-order modulation is realized, and the bit error rate performance is excellent.

A method at a first communication node side for wireless communication with a second communication node, at least one of the first communication node and the second communication node being in a reduced power consumption state for wireless communication related activities, the method has the following steps: transmitting a first data set to the second communication node in accordance with predefined or preconfigured control information; the control information is only arranged in a backspacing downlink control information format; or the control information is only arranged in a first simplified backoff downlink control information format; or the control information is arranged in a format selected from a plurality of fallback downlink control information formats and / or one or more second simplified fallback downlink control information formats.

This invention discloses a physical layer secure communication method to counter eavesdropping attacks. The communication process consists of two time slots. In the first time slot, a roadside base station selects an antenna to transmit a NOMA signal, while nearby and distant user vehicles simultaneously transmit artificial noise to interfere with the eavesdropping user vehicle. In the second time slot, the nearby user vehicle acts as a relay node, XORing the decoded distant user message with the artificial noise signal generated in the first time slot, and then sending the mixed signal to the distant user vehicle. The distant user vehicle simultaneously transmits artificial noise to interfere with the eavesdropping user. In the vehicle-to-everything (V2X) network, the nearby user, the distant user, and the eavesdropping user calculate their respective required signal-to-interference-plus-noise ratio (SIR) based on the received signals, and calculate the system user's interruption probability and interception probability. Compared with existing secure communication schemes in V2X networks, the secure communication scheme of this invention can significantly enhance the physical layer security of nearby and distant user vehicles.

The application provides a railway signal transmission method and system for multi-protocol hybrid communication, relates to the technical field of railway signal transmission, and combines satellite navigation and inertial measurement data in train operation to calculate a pose state, and predicts a precision decline trend according to a satellite signal feature; key data redundancy coding is generated according to the trend, secondary spectrum resources are identified, and a dynamic topology graph containing multi-protocol relay nodes and adjacent trains is constructed in combination with the pose state and a train operation plan; when the precision decline reaches a preset condition or the main communication link deteriorates, the redundancy coding is decomposed and distributed across protocols to the relay nodes to form distributed pre-storage, a digital twin network model is simultaneously established and dynamically updated, based on the model, in combination with the precision trend and the pre-storage state, a cross-protocol transmission path is arranged, transmission paths and quality of service strategies are generated for different priority services, and control instructions are issued in advance, so that dynamic planning and reliable guarantee of signal transmission in a railway multi-protocol hybrid communication scene can be realized.

The invention provides a dynamic routing selection and optimization method in a satellite communication network, relates to the technical field of satellite communication, and solves the problems of routing failure, uneven load and weak fault resistance in the prior art. The invention relates to a dynamic routing selection and optimization method in a satellite communication network, which comprises the following steps of: S1, acquiring and preprocessing a multi-dimensional network state in real time: acquiring a satellite node state and an inter-satellite link state, and constructing a standardized state vector containing a position, power, a load, time delay and an error rate; and S2, dynamic network topology modeling and prediction: predicting link visibility based on an orbit mechanical model, and constructing a directed graph model with a comprehensive measurement weight. According to the invention, the anti-fault capability is enhanced, the link interruption recovery time is shortened to 50ms by a pre-stored backup path and a rapid switching mechanism, the service continuity is improved by 95%, the spectrum efficiency is optimized, the use of low-quality links is avoided by comprehensive link measurement, and the spectrum utilization rate is improved from 65% to 85%.

The application relates to the technical field of radio frequency communication control, and discloses a beamforming precision control method, which comprises the following steps: acquiring service quality parameters of a user and frequency domain channel information; generating a user priority sequence; constructing a three-dimensional resource scheduling matrix; outputting a beamforming coefficient matrix and a power distribution result; and performing beam precision closed-loop regulation and control of a radio frequency array. Compared with the prior art, the method can combine dynamic changes of user QoS to perform real-time resource scheduling and fine beam regulation, and can solve the technical problem that it is difficult to realize stable beamforming control, especially in the scene that a chip supporting large-scale user concurrency needs to dynamically adjust the beam according to the QoS requirement. According to the application, a dynamic resource scheduling matrix is constructed by combining power perception, and a multi-dimensional feedback calibration mechanism based on amplitude and phase perturbation is combined, so that high-precision beam control is realized, and the communication stability and regulation flexibility are improved.

The application discloses a multi-unmanned aerial vehicle (UAV) perception control method based on radio signal conflict resolution, which comprises the following steps: acquiring the electromagnetic spectrum characteristics of a power transmission line corridor through UAV formation cooperative perception to construct a dynamic spectrum map; planning the soft boundary flight corridor of each UAV according to the dynamic spectrum map and safety interval constraints, and setting a smooth potential function gradient in the boundary; encapsulating the atomic flight action sequence as a functional module instruction package and assigning an execution priority; calculating the potential field force according to the real-time position of the UAV and the position of the obstacle, determining the availability of the instruction package according to the consistency of the potential field direction and the main motion direction of the instruction package, and assigning a communication frequency point according to the communication demand of the available instruction package; generating a control instruction according to the available instruction package and preferentially outputting an emergency safety instruction; and the application integrates spectrum avoidance, space constraints and instruction scheduling into a unified framework, resolves the radio signal conflict in multi-UAV cooperation from the root, and ensures the reliable transmission and safe execution of the control instruction.

The invention discloses a communication system based on intelligent beam forming and dynamic spectrum sensing, which relates to the technical field of communication technology and comprises a cognitive spectrum sensing module, a satellite-ground cooperative beam forming module, an edge intelligent control module and a self-adaptive communication transceiving module. The cognitive spectrum sensing module acquires a cognitive radio multi-dimensional analysis model through a wide-frequency-band signal; through a deep residual network and cognitive cycle detection combined spectrum sensing algorithm and an Attention-LSTM spectrum prediction model, the cross-band spectrum hole recognition accuracy is improved to 92% or above, the spectrum prediction advance reaches 2-8 s, and the spectrum utilization rate is improved by 50% or above; according to the AI-driven adaptive communication mechanism and the joint optimization strategy, the system can adapt to the multi-scene requirement from urban dense coverage to polar region remote coverage, the communication rate is increased to 500 Mbps or above, the time delay is controlled within 20 ms, and the 6G advanced research communication standard is achieved.

The application discloses a kind of measurement equipment independent quantum key distribution methods based on AI's frequency bin coding, including computer system executes following steps: input quantum signal sent by communication both sides, relative radial velocity between communication node and infeasible relay node and historical quantum interference statistical characteristic data;Quantum channel observation and frequency bin quantum state construction, the dynamic evolution of frequency bin caused by relative motion, frequency compensation decision based on reinforcement learning, the influence of residual frequency error on quantum interference performance, frequency bin utilization rate and error propagation caused by interference degradation and security key rate generation.The application can effectively improve the adaptability and operation reliability of MDI-QKD system based on frequency bin in dynamic, multi-noise environment, and provides an intelligent solution for security key distribution in high-capacity quantum communication network.

The utility model discloses a kind of dual-path voice simultaneous transmission wireless transceiving systems, including transmitting part and receiving part, the transmitting part includes sequentially connected low-frequency amplification circuit, frequency synthesis oscillation circuit, resonant hybrid circuit and impedance matching transmitting circuit, the receiving part includes sequentially connected signal receiving circuit, frequency modulation circuit, mixing frequency discriminator circuit and power amplifier circuit, the impedance matching transmitting circuit is connected with the signal receiving circuit communication, the low-frequency amplification circuit receives dual-path voice input signal, the power amplifier circuit outputs dual-path voice signal;The utility model is characterized in that: the immediacy of communication is higher.