93 results about "Millimeter wave communication systems" patented technology

The invention discloses a layout planning method of a millimeter wave communication system, which relates to the technical field of millimeter wave communication, and comprises the following steps: acquiring a base station node of a to-be-detected area, and acquiring power attenuation influence data and propagation path influence data of millimeter waves according to the base station node; constructing a propagation path model based on a machine learning algorithm according to the propagation path influence data, and obtaining an actual transmission path distance of the millimeter waves; constructing a millimeter wave power attenuation model based on a machine learning algorithm according to the power attenuation influence data and the propagation path model; obtaining an optimal effective coverage range of a base station according to the millimeter wave power attenuation model, and ensuring that a signal can cover an expected user area; the millimeter wave power attenuation model is established to solve the problems of signal phase interference, inaccurate power attenuation when wireless signals are transmitted in a free space and large errors caused by a multipath effect formed when reflected signals and direct signals reach a receiving end at the same time.

The invention discloses a sparse interaction beam prediction method fusing perception and communication. The method comprises the following steps: acquiring and preprocessing multi-modal sensing data; feature extraction is carried out on the preprocessed multi-modal sensing data; introducing a learnable potential vector by adopting a Perceeiver-Transform structure, and carrying out cross attention interaction on the learnable potential vector and the spliced sequence, so as to obtain a multi-modal fusion feature; and mapping the multi-modal fusion features to a millimeter wave beam space through a beam domain projection mechanism, generating probability distribution of the beam space, and outputting a predicted optimal beam according to the probability distribution. According to the method, the learnable potential vectors are adopted, sparse interaction and efficient fusion of the multi-modal fusion features are achieved, the sensing features are mapped to the millimeter wave beam space through a beam domain projection mechanism, the calculation amount is reduced, the robustness and prediction precision are improved, and the method is suitable for large-scale popularization and application. And the method is suitable for millimeter wave communication systems in low-altitude unmanned aerial vehicles, Internet of Vehicles and high-dynamic environments.

The invention relates to an industrial wireless system millimeter wave beam prediction method assisted by multi-mode environment semantics, and belongs to the technical field of industrial wireless communication. According to the method, for a millimeter wave wireless communication process from a base station to a user in a factory, absolute position environment semantics of the user in a global positioning system and relative position environment semantics relative to the base station are extracted and obtained through a global positioning module deployed in the user and a camera of the base station; and inputting into a lightweight efficient neural network prediction model, and finally outputting a beam index to complete millimeter wave beam prediction. According to the method, the actual communication process of the millimeter wave communication system in the industrial wireless environment is considered, the efficient prediction of the beam is realized on the premise of low overhead of system resources, and the requirements of high-mobility and low-delay industrial wireless communication scenes are met.

The invention relates to a millimeter wave beam tracking method fusing vision and 3D point cloud perception, and belongs to the field of wireless communication. The method faces a millimeter wave wireless communication system, combines vision and 3D point cloud sequence information in an environment collected by a camera deployed in a base station and a laser radar, utilizes a constructed multi-modal sequence-to-sequence beam tracking model to perform depth feature extraction on an image and a point cloud, realizes information interaction between modals through machine learning, and realizes multi-modal beam tracking. A uniform time sequence fusion feature representation form is formed, and real-time prediction of a current beam and continuous tracking of a plurality of beams in the future are realized. According to the method, the gating recurrent neural network is introduced, the multi-mode sequence is constructed to the sequence model for beam tracking, the beam tracking precision and stability can be effectively improved, and the communication efficiency of the millimeter wave communication system is guaranteed.

The invention discloses an RIS-assisted millimeter wave URLLC communication system hybrid precoding design method. Establishing an RIS-assisted downlink millimeter wave URLLC communication system model, and defining a user reachable rate; establishing an optimization problem which takes maximization of a user reachable rate weighted sum as a target and takes digital precoding, analog precoding and an RIS phase shift matrix of a transmitter as variables; introducing an auxiliary variable to simplify a target function, and adding a corresponding constraint condition to ensure the equivalence of an optimization problem; decomposing the equivalent optimization problem into three sub-problems, and calculating optimization variables by using a first-order Taylor expansion technology, a minimum Euclidean distance method and a continuous convex approximation algorithm; and iteratively calculating the absolute value of the difference of the weighted sums of the reachable rates of the corresponding users before and after the optimization variables are updated until a preset termination condition is met. According to the method, the hardware cost of wireless transmission is reduced, and the system performance of URLLC millimeter wave communication is remarkably improved by optimizing the sending direction and phase of the beam.

The invention discloses a three-dimensional millimeter wave time-varying channel estimation method and device, and belongs to the field of wireless communication, and the method comprises the steps: building a millimeter wave communication system containing array motion; a three-dimensional time-varying channel model considering the Doppler effect is established, composite signals, caused by array motion, in a three-dimensional time-varying channel are analyzed, each column of a direction matrix after synthesis is consistent with the array manifold of a planar array, and it is indicated that a moving linear array can form a virtual planar array; sparse representation of a three-dimensional time-varying channel is realized through linear array motion; a three-dimensional time-varying channel is recovered based on an iterative meshless weighting algorithm of array motion; comprising AoAs estimation and path gain estimation. According to the method, the negative influence of Doppler frequency shift in the time-varying channel on channel estimation is overcome, the virtual array element is constructed, channel estimation of the three-dimensional millimeter wave time-varying channel is realized through linear array motion, the channel estimation precision is improved, and the pilot frequency overhead and the algorithm complexity are greatly reduced.

The invention provides an STAR-RIS assisted transmission scheduling method for a high-speed rail millimeter wave communication system. The method comprises the following steps: constructing an STAR-RIS-assisted high-speed railway millimeter wave communication system model in the SAGIN, and setting a channel modeling and train moving model of a link in the model; the method comprises the following steps of: setting a target function of a transmission scheduling problem of completing the total number of streams to the maximum extent by considering the movement of a train, signal to interference plus noise ratio constraint, QoS (Quality of Service) requirements of the streams, channel change and a scheduling sequence of the streams; solving the objective function through a coalition game algorithm, and obtaining the total number of successfully scheduled streams in all the unites; and performing priority ranking on all successfully scheduled flows according to the QoS requirements of the flows through a flow scheduling algorithm. According to the method disclosed by the invention, the communication quality of the STAR-RIS assisted high-speed rail train-ground millimeter wave communication system is improved by optimizing inter-flow interference and flow scheduling, the system can be ensured to efficiently work in a complex multi-source interference environment, and the ever-increasing QoS demand of high-speed rail communication is met, so that the ever-increasing QoS demand in the high-speed rail communication is met.

The invention discloses a resource optimization system and method for a distributed RIS-assisted millimeter wave communication system, and belongs to the technical field of wireless communication. The system comprises a base station which is provided with MBS antennas to form a uniform linear array and is connected with NRF radio frequency chains; each radio frequency chain is connected with MBS antennas through MBS phase shifters in a full connection mode; the plurality of distributed RISs are used for assisting the terminal equipment to carry out millimeter wave communication in downlink transmission; the plurality of terminal devices are divided into a plurality of NOMA groups, and each NOMA group is provided with a transmission service by a corresponding RIS; wherein joint optimization is carried out on pairing of the RIS and the equipment, RIS phase shift optimization, digital precoding design and base station sending power distribution, so that the total achievable throughput of a communication system in downlink transmission is maximized. The method can solve the problem that millimeter wave signals are easy to block, improves the utilization rate of spectrum resources, and can effectively improve the total throughput of a system.

Techniques are provided for managing transmit and receive beams in a millimeter wave (mmW) communication system for use in bistatic radio frequency (RF) sensing. An example method of tracking targets with bistatic radio frequency sensing includes receiving one or more sensing reference signals, generating a signal report based at least in part on the one or more sensing reference signals, transmitting the signal report, receiving tracking signal configuration information, receiving one or more tracking reference signals identified in the tracking signal configuration information, and tracking one or more targets associated with the one or more tracking reference signals.

The invention relates to a vision-assisted millimeter wave beam prediction method for a low-light environment, and belongs to the field of wireless communication. The method is oriented to a millimeter wave communication system, image data of a communication environment under a low light condition is acquired through a camera installed on a base station, a millimeter wave beam prediction system model is constructed, the acquired image data is learned by using a deep neural network model and a course training strategy, and an optimal communication beam is predicted. According to the method, the performance of the model can be improved in the low-light environment, the convergence speed of the network model is increased, the accuracy of beam prediction can be improved, and the robustness and reliability of the millimeter wave communication system in the low-light environment are enhanced.

The invention discloses an ultrathin dual-polarized lens antenna based on a double-layer Huygens metasurface, and relates to the technical field of plane transmission array antennas. The ultrathin dual-polarized lens antenna based on the double-layer Huygens metasurface is provided with a horn antenna feed source module and a double-layer Huygens metasurface module. The double-layer Huygens metasurface module is composed of a medium supporting layer in the middle and metal patch layers of which the top layer and the bottom layer are identical in structure. The unit grids of the double-layer Huygens metasurface module are arranged according to hyperbolic phase distribution to form a super-lens function, and quasi-spherical waves emitted by the horn antenna feed source module are converted into plane waves emitted in a single direction, so that the directivity and radiation gain of electromagnetic waves are improved. The antenna has the advantages of dual polarization response, ultra-thin thickness smaller than one tenth of wavelength, easy integration, high radiation gain and high aperture efficiency, and can be widely applied to the fields of millimeter wave communication systems, wireless power transmission and the like.

The invention discloses an RIS-assisted hybrid beam forming millimeter wave communication system and method, and the system comprises a base station which is provided with Nt uniform planar array antennas; the base station adopts a hybrid beam forming structure, and Nt transmitting antennas share NRF radio frequency links; the RIS is provided with M uniform planar array reflection elements and can adjust a reflection coefficient according to real-time channel state information; the user terminal communicates with the base station through the RIS; according to the method, beam forming and RIS reflection coefficient configuration are mixed by adopting a joint optimization method based on a codebook, so that the calculation burden in the channel estimation and beam forming processes is reduced. According to the invention, the RIS is introduced into the hybrid beam forming millimeter wave communication system, so that the problem of communication interruption caused by shielding is relieved. The invention further provides a joint optimization method based on the codebook, and the joint optimization method is used for hybrid beam forming and RIS reflection coefficient configuration so as to reduce the calculation burden in the channel estimation and beam forming process.

The present invention discloses an intelligent beam width optimization method based on reinforcement learning. The method suppresses the beam drift effect in millimeter wave communication by dynamically adjusting the beam width. The algorithm models the beam width dynamic optimization problem as a Markov decision process, and selects the optimal beam width for data transmission at each decision moment. Its state design can characterize the severity of the beam drift effect of the current system from multiple angles, and each action corresponds to a different beam width, thereby optimizing and adjusting the width of the data transmission beam by sensing the speed of environmental changes. In each state, the optimal beam width for data transmission is selected according to the AC algorithm, and the policy network and value network are continuously updated during training to improve the rationality and reliability of model selection, while introducing a dynamic network update mechanism to reduce the computational burden of network updates. The throughput of the millimeter wave communication system under the beam drift effect is improved, thereby continuously ensuring the quality of the communication link.

The invention discloses a packaging antenna module and a millimeter wave packaging antenna. The packaging antenna module comprises a packaging body; the trapezoidal shallow cavity structure is positioned in the packaging body and is used for integrating a chip; the first antenna array is located on the first side of the trapezoidal shallow cavity structure and is arranged on the upper surface of the packaging body; the second antenna array is located on the second side of the trapezoidal shallow cavity structure and is arranged on the upper surface of the packaging body; and the bonding pad array is positioned on the lower surface of the packaging body and is used for connecting a circuit board. According to the embodiment of the invention, the problems of low integration level and insufficient performance of the antenna in the prior art are solved, the packaging antenna performance with low loss, high efficiency and high integration level is realized, and the application requirement of a millimeter wave communication system is met.

The present invention belongs to the field of wireless communication technology, and specifically relates to a positioning method for a millimeter wave communication system using low-precision quantization. The present invention proposes an alternating iterative algorithm framework in the channel estimation stage. First, the unquantized channel is restored by the generalized Turbo algorithm, and the channel is roughly estimated using multi-task sparse Bayesian learning. Subsequently, the channel is finely estimated based on expectation maximization, and the above process is iterated to complete the channel parameter estimation. In the position estimation stage, the residual between the channel parameters obtained from the position information and the channel parameters estimated by the algorithm is used as an optimization function, and the Newton method is used to solve the optimization problem. Experiments show that the millimeter wave communication system positioning method proposed in the present invention can still achieve accurate user positioning under low-precision quantization conditions and reach the corresponding theoretical lower bound.

The invention belongs to the technical field of high-speed rail communication, and discloses a method for optimizing an intelligent reflecting surface in high-speed rail communication based on discrete phase shift, which comprises the following steps of: constructing a high-speed rail millimeter wave communication system comprising a base station, the intelligent reflecting surface and a plurality of mobile relays; establishing a channel model of each channel in the high-speed rail millimeter wave communication system; deducing a received signal expression of each mobile relay by combining the channel model and the discrete phase shift of the intelligent reflecting surface, and calculating the reachable rate of each mobile relay; establishing a target function by taking minimization of the transmitting power of the base station as a target, and meanwhile, setting constraint conditions to construct an optimization problem; and jointly optimizing the transmission covariance matrix of the base station and the discrete phase shift of the intelligent reflecting surface, and solving an optimization problem through an alternate optimization algorithm to reduce the transmission power of the base station. By adopting the method provided by the invention, the power consumed by the base station is reduced on the premise of ensuring the communication quality of the mobile relay.

A three-dimensional millimeter wave time-varying channel estimation method and device belong to the field of wireless communication, comprising: establishing a millimeter wave communication system containing array motion; establishing a three-dimensional time-varying channel model considering Doppler effect, analyzing the synthesized signal in the three-dimensional time-varying channel caused by array motion, each column of the synthesized direction matrix being consistent with the array manifold of the planar array, indicating that the linear array in motion can form a virtual planar array; realizing sparse representation of the three-dimensional time-varying channel through linear array motion; recovering the three-dimensional time-varying channel based on the iterative meshless weighted algorithm of array motion; comprising AoAs estimation and path gain estimation. The application overcomes the negative influence of Doppler frequency shift in the time-varying channel on channel estimation, constructs virtual array elements, realizes channel estimation on the three-dimensional millimeter wave time-varying channel through linear array motion, improves channel estimation accuracy, and greatly reduces pilot overhead and algorithm complexity.

The invention belongs to the technical field of wireless communication security and signal processing, and discloses a high-reliability equipment authentication method based on antenna array error characteristics and dual-beam transmission, which comprises the following steps of: 1, constructing dual beams, and transmitting a signal received by user equipment through the dual beams; 2, actively tracking the double beams, and adjusting the directions of the double beams in real time; 3, modeling the statistical analysis model of the radiation mode; 4, defining a radiation mode characteristic extraction target, completing characteristic extraction, and calculating a gain error value, a phase error value and a position error value; and step 5, calculating signal energy, comparing the signal energy as an energy detection statistic with a preset threshold value, judging the legality of a signal source, and completing the authentication of the equipment. The authentication scheme provided by the invention can effectively cope with the influence of array errors, so that a reliable and efficient authentication solution is provided for a millimeter wave communication system, and the security of a communication link is enhanced.

The invention provides a 3D printed circularly polarized lens antenna, which relates to the technical field of communication, and comprises a plurality of inclined fan-shaped flat plates and a central circular connection structure, the plurality of inclined fan-shaped flat plates are rotationally arranged around the central axis of the lens; the inclination angle of the fan-shaped flat plate is 60 degrees, and a corner cutting structure is arranged on the edge of the fan-shaped flat plate. A novel lens structure is used, and the multi-beam coverage problem of directional circular polarization radiation in a millimeter wave communication system is solved.

The application discloses a kind of FPGA implementation methods for time-frequency synchronization of multi-path parallel transmission millimeter wave OFDM communication system, according to the frame structure of transmission signal physical layer and the number of parallel transmission paths of FPGA implementation time base, training sequence with specific structure is generated in time domain;Correlation operation is carried out on baseband multi-path parallel receiving signal using delay autocorrelation method, and the coarse timing synchronization position is found by the method of flow experience threshold comparison;The angle information carried by autocorrelation result is used to realize the frequency offset estimation calculation of system;The correlation operation is carried out on local cache sequence and receiving signal sequence, and the fine timing synchronization position is obtained;The final system symbol timing synchronization result position index is obtained by adding coarse synchronization and fine synchronization result, and the data sequence after symbol timing synchronization is output;Corresponding complex exponential signal is generated simultaneously, and frequency offset compensation operation is carried out on the sequence after timing synchronization, to complete system synchronization task.The application can improve system synchronization accuracy, reduce hardware implementation time cost and complexity.

A communication system operable in the millimetre-wave spectrum including: a transmitter arranged to emit a transmit millimetre-wave signal, a polymer millimetre-wave fibre arranged to propagate the transmit millimeter-wave signal, a receiver arranged to receive the propagated transmit millimeter-wave signal. The transmitter is arranged to receive an input signal and includes: an in-phase path and a quadrature path for the input signal, modulation means for performing modulation with a millimetre wave carrier signal, amplifier means, combiner means. The in-phase path and the quadrature path each has a pre-equalizing filter to filter the input signal, prior to applying the input signal to the modulator means, amplifier means and combiner means.

The invention belongs to the technical field of photo-generated millimeter wave communication, and particularly relates to a photo-generated millimeter wave communication system and a channel response estimation method thereof, which can directly estimate channel response in the photo-generated millimeter wave communication system. Sampling frequency deviation of a specific value is artificially added in a filter equalization mode, cross-correlation synchronization is carried out on the received and transmitted signals, synchronization peaks are extracted, and any synchronization peak group is the estimated channel response. Compared with the prior art, the method has the advantages of being easy to implement, low in complexity, high in flexibility and the like, and due to the fact that the method is implemented in digital signal processing, the flexibility of the system can be greatly improved.

The invention discloses an unmanned aerial vehicle millimeter wave channel model establishment method based on intelligent reflecting surface modularization, and the method comprises the steps: building an intelligent reflecting surface-assisted unmanned aerial vehicle millimeter wave near-field channel model, and obtaining the complex channel gain of the intelligent reflecting surface-assisted unmanned aerial vehicle millimeter wave near-field channel model; establishing an unmanned aerial vehicle millimeter wave near-field channel model with a modularized intelligent reflecting surface to obtain a complex channel gain of the unmanned aerial vehicle millimeter wave near-field channel model; the method comprises the following steps: simplifying an unmanned aerial vehicle millimeter wave near-field channel model based on intelligent reflecting surface modularization, establishing a far-field channel model, and obtaining a complex channel gain of the far-field channel model; designing a reflection phase after intelligent reflection surface modularization based on a reflection unit gain maximization criterion of a far-field channel model; calculating an approximate closed expression of the received signal power; and calculating a power loss ratio, and exploring the influence of the intelligent reflecting surface partitioning scheme on the performance gain of the millimeter wave system of the unmanned aerial vehicle. The method provided by the invention can provide a thought for exploring the application prospect and exploration of intelligent reflecting surface modularization in the millimeter wave communication system of the unmanned aerial vehicle, and provides more possibilities for the next generation of wireless communication technology.

The present invention discloses an ultra-wideband notch antenna for a 5G millimeter wave communication system, comprising a first metal layer, a second metal layer and a third metal layer; the second metal layer is a metal ground, the third metal layer is a feeding part, and the first metal layer is a radiating part, comprising a radiating patch and a parasitic patch; the radiating patch is a dipole structure, comprising two dipole arms, and the end of each dipole arm is bent inward on the side away from the symmetry axis; the parasitic patch comprises a first parasitic patch and a second parasitic patch, the first parasitic patch is located outside the end of each dipole arm, and is used to excite a current in the same direction as the dipole arm within the working frequency band to improve the impedance matching of the antenna; the second parasitic patch is located between the ends of each dipole arm, and is equivalent to a half-wavelength resonator at the center frequency of the required filtering band. When the antenna operates within this frequency band, the surface current of the antenna will be concentrated on the parasitic patch, thereby causing impedance mismatch and achieving effective filtering of this frequency band.

The invention discloses a millimeter wave high-gain planar super-structure grating antenna, which structurally comprises an excitation waveguide with an electromagnetic wave incident port, a quasi-periodically arranged metal grating structure and a two-dimensional dielectric waveguide with a single-sided conductive layer at the bottom. The antenna adopts a quadruple rotational symmetry structure design, and ensures that radiation modes excited by four ports have consistency. The large-aperture antenna is excited based on a traveling wave mode, periodic modulation of a dielectric waveguide propagation mode is realized through grating loading, and energy is prompted to be radiated in a fast wave form; and meanwhile, a small number of grating units are non-uniformly arranged, so that the grating lobe effect of the antenna array is effectively reduced. Electrically large-size aperture excitation is realized through a low-complexity planar structure, and the antenna has the characteristics of high efficiency and high gain, and can be applied to a millimeter wave communication system.

The invention relates to the waveguide technology and microstrip line technology field of a millimeter wave communication system, and especially relates to a double-layer substrate integrated waveguide resonator based on a loading capacitor paster, which comprises an upper surface metal clad copper, an upper layer dielectric plate, a middle metal clad copper, a lower layer dielectric plate and a lower surface metal clad copper from top to bottom in sequence. The middle metal clad copper comprises a loading capacitor patch, the two sides of the loading capacitor patch are connected with microstrip line feed parts respectively, and the microstrip line feed parts are arranged on the center line of the loading capacitor patch; the upper dielectric plate and the lower dielectric plate are respectively provided with two groups of metal through holes which are periodically arranged, and the center of the loading capacitor patch is provided with a rectangular groove. According to the invention, the intrinsic resonant frequency of the resonator can be controlled, and the resonant mode and the transmission zero point can be controlled, so that the controllable center frequency and bandwidth can be realized.

The present invention discloses a method for monitoring the settlement of a high-speed magnetic levitation track. First, during the travel of a magnetic levitation train, the communication signal power value of an existing high-speed magnetic levitation millimeter wave communication system is extracted, and a received power curve of the line is drawn. Then, by analyzing the changes in the received power curve, the settlement of the track is detected, and the settlement value is extracted using the offset of the peaks and troughs to achieve track monitoring. The method of the present invention is based on a dual-path propagation model in wireless communication and relies on an existing high-speed magnetic levitation millimeter wave communication system. It overcomes the problems of complex operation and poor real-time performance of existing track monitoring methods, and also solves the difficult problems of high cost and multiple environmental restrictions of modern track monitoring technology. It can serve as a powerful supplement to existing monitoring systems and is applicable to high-speed magnetic levitation tracks, as well as high-speed railways, ordinary railways, and even low-speed railways, where track settlement monitoring is required. It has the advantages of good real-time performance, a wide measurement range, and low cost.

The invention provides a combined scheduling method for predicting and enhancing QoS (Quality of Service) sensing millimeter wave beams and power, and belongs to the technical field of wireless communication and resource management. In a millimeter wave system, user equipment periodically measures downlink reference signal receiving power and reports the downlink reference signal receiving power to a base station; and the BS maintains a historical RSRP sequence for each UE, and performs multi-step prediction by using an AI model to obtain a Top-K candidate beam at a future moment and the quality of the Top-K candidate beam. And the base station fuses the prediction result with the queue state, the service type and the QoS constraint, constructs a prediction enhancement state, and jointly optimizes beam selection and power distribution based on a deep reinforcement learning model. According to the method, a neural network does not need to be deployed on the UE side, the problem of channel aging is effectively relieved, the spectrum efficiency is remarkably improved in a high-mobility scene, meanwhile, time delay is reduced, the QoS default probability is reduced, and the method is suitable for a millimeter wave communication system of eMBB, URLLC and mMTC mixed services.

The invention relates to a communication system (1) operable in the millimeter-wave spectrum, comprising:-a transmitter (10) arranged to transmit a transmit millimeter-wave signal,-a polymeric millimeter-wave fiber (30) arranged to propagate the transmit millimeter-wave signal,-a receiver (20) arranged to receive the transmit millimeter-wave signal from the polymeric millimeter-wave fiber (30), the transmitter (10) is arranged to receive an input signal and comprises:-an in-phase path (5) and a quadrature path (7) for the input signal,-modulation means (16) for performing modulation by means of a millimeter wave carrier signal,-amplifier means (17),-combiner means (18), and is characterized in that the in-phase path (5) and the quadrature path (7) are coupled to the in-phase path (5) and the quadrature path (7), and in that the in-phase path (5) and the quadrature path (7) are coupled to the in-phase path (7). The in-phase path and the quadrature path each comprise a pre-equalization filter (12, 14) to filter an input signal before the input signal is applied to the modulator device, the amplifier device and the combiner device.