75 results about "Millimeter wave communication systems" patented technology

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 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 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 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 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 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 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 application discloses a precision-adjustable wideband temperature compensation circuit based on a gallium arsenide process and relates to the technical field of integrated circuits.The circuit comprises a temperature compensation driving module, a temperature compensation attenuation module and a temperature compensation precision control logic module.The temperature compensation driving module senses environmental temperature changes through a clamping circuit and a differential network and outputs an analog control voltage.The temperature compensation attenuation module comprises a plurality of parallel controllable attenuation units, each of which comprises two series-connected transistors, and the on-off of each controllable attenuation unit is controlled by a switch signal of the control logic module and the attenuation amount of each controllable attenuation unit is controlled by an analog voltage of the driving module.The control logic module controls the conduction of different numbers of attenuation units by receiving an external TTL signal, so that the multi-gear adjustment of the overall temperature compensation precision is realized.The application overcomes the shortcomings of the traditional temperature compensation circuit, such as unadjustable precision and narrow frequency band, and has the advantages of wide working frequency band, adjustable temperature compensation precision, compact structure and easy integration, and is suitable for high-performance millimeter wave communication systems.

A phase shifter for a millimeter wave (mmW) communication system, the phase shifter comprising: an in-phase variable gain amplifier (I VGA) and a quadrature VGA (Q VGA) configured to receive a radio frequency (RF) signal, the I VGA and the Q VGA configured to provide selectable outputs to a primary side of a first electromagnetic (EM) element and a primary side of a second EM element, respectively, the first EM element is configured to provide a single-ended I output and the second EM element is configured to provide a single-ended Q output; and a hybrid quadrature generator (HQG) configured to receive a single-ended I output of the first EM element and a single-ended Q output of the second EM element, the HQG configured to provide a combined signal at a desired phase.

The invention discloses a high-speed magnetic suspension track settlement monitoring method based on wavelet transform, which comprises the following steps of: extracting global phase information of a power curve in an existing high-speed magnetic suspension millimeter wave communication system in a train running process, extracting a local phase of a signal by adopting complex Morlet wavelet transform, and calculating the settlement of the high-speed magnetic suspension track; and a global mapping relation between the phase difference and the orbit settlement amount is established, space-frequency domain analysis is performed on signals through wavelet transform, and signal phase difference information is extracted in combination with analysis of a wavelet coefficient envelope and a ridge line, so that high-precision sensing and monitoring of the orbit settlement state and the evolution trend thereof are realized. According to the method, the bottlenecks of an existing track monitoring method in the aspects of complex operation, poor real-time performance, high cost and the like are broken through, the problems that a modern monitoring technology is poor in settlement adaptability, expensive in equipment and the like are solved, additional hardware equipment is not needed, the system construction, operation and maintenance cost is reduced, high-precision, low-cost and real-time monitoring is achieved, and the method is suitable for popularization and application. And a new technical path is provided for dynamic tracking of track settlement and deformation.

The invention discloses a millimeter wave band-pass radio frequency switch circuit, a radio frequency switch and a wireless communication system. The circuit comprises a first transistor, a second transistor, a first inductor and a second inductor, a grid electrode of the first transistor is used for accessing a first bias voltage, a drain electrode of the first transistor is connected with one end of the first inductor, and a source electrode of the first transistor is grounded; the other end of the first inductor is grounded; the grid electrode of the second transistor is used for accessing a second bias voltage, the drain electrode of the second transistor and the drain electrode of the first transistor are connected with the common connection end of one end of the first inductor, and the source electrode of the second transistor is connected with one end of the second inductor. Compared with a traditional low-pass matching network type switch, the band-pass network can move a working frequency band from a low frequency to a high frequency, the stop-band network provides excellent isolation performance, and the low-pass matching network type switch is suitable for a high-frequency-band and multi-system millimeter wave communication system.

A millimeter wave (mmW) communication system on a millimeter wave integrated circuit (MMW-IC) includes a phase shifter selectively connected to a receive path through a first electromagnetic (EM) element and selectively connected to a transmit path through a second EM element, the first EM element is configured to receive a transmit signal and configured to receive a receive signal from a low noise amplifier (LNA), and the second EM element is configured to receive a phase shifted transmit signal or a phase shifted receive signal from a phase shifter, and wherein the second EM element is configured to selectively provide the phase shifted transmit signal to a power amplifier on the mmW-IC and to provide the phase shifted receive signal to a receive signal processing circuit located outside the mmW-IC.

This invention provides a wireless communication control method and apparatus utilizing element error fitting of a millimeter-wave array antenna. The method includes: identifying anomalous element positions based on the synchronization relationship between the received signal sequences of each element obtained from the downlink reference signal received by the millimeter-wave array antenna during normal communication, thus obtaining anomalous elements; constructing local spatial response difference features based on the first received signal of the anomalous element in the received signal sequence and the second received signal of the normal element in the received signal sequence; fitting the offset of each anomalous element relative to the ideal element response based on the projection behavior of the local spatial response difference features in the spatial angular domain, thus obtaining the element error morphology; and activating redundant antenna subarrays if the element error morphology indicates that the millimeter-wave array antenna does not meet preset beam pointing conditions. This invention improves the robustness and stability of millimeter-wave communication systems under complex hardware conditions.

The present invention provides a communication control method and system for a high-speed rail millimeter wave communication system, comprising: obtaining channel state information and a pre-constructed system capacity maximization problem function; the pre-constructed system capacity maximization problem function includes a beamforming sub-problem optimization and a phase shift design sub-problem optimization; based on the channel state information, and using an alternating optimization algorithm, iteratively solving the beamforming sub-problem optimization and phase shift design sub-problem optimization in the pre-constructed system capacity maximization problem function to obtain optimal beamforming and optimal phase shift; and performing vehicle-to-ground communication data transmission and / or obstacle detection and / or train positioning based on the optimal beamforming and optimal phase shift. The present invention can overcome the high transmission loss problem of millimeter waves, achieve system sum rate maximization under the constraints of a minimum perceived signal-to-noise ratio threshold and the maximum transmit power of a base station, and ensure a good trade-off between communication performance and perceived performance.

The invention provides a three-dimensional wave beam squint suppression method based on a four-layer time delayer architecture, aims at solving the problem that the array gain is reduced by a wave beam squint effect in broadband millimeter wave communication, and belongs to the technical field of wireless communication. The method comprises the following steps: performing singular value decomposition on a frequency domain channel matrix, and extracting dominant right singular vectors as an optimal beam forming matrix, wherein the number of the dominant right singular vectors is equal to that of data streams; decomposing an array response vector of the UPA into two parts in a vertical direction and a horizontal direction; time delay vectors of the first layer and the second layer TTD in the vertical direction and time delay vectors of the first layer and the second layer TTD in the horizontal direction are calculated, and time delay values are quantized; combining phase shifts generated by the time delay value into an analog beam forming vector; and solving an analog beam forming matrix and a digital beam forming matrix by using a broadband sparse reconstruction algorithm. According to the method, the power consumption of the analog beam former in the broadband millimeter wave communication system is reduced, and a better beam squint suppression effect can be realized.

The invention belongs to the technical field of communication, and discloses a millimeter wave communication system-oriented covert communication authentication integration method, which specifically comprises the following steps of: 1, in a millimeter wave communication system, trying to initiate a passive attack and an active attack by an attacker; the method comprises the following steps: 1, carrying out mutual coupling matrix modeling to generate a hardware fingerprint, carrying out channel characteristic modeling and optimizing an antenna array guide vector, and 3, carrying out matched filtering on a legal base station by using the optimized antenna array guide vector and user equipment by using a receiving beam, and calculating a signal-to-noise ratio to improve communication performance and throughput. 4, a novel physical layer security framework CovertAuth suitable for the millimeter wave beam alignment stage is constructed, the security framework comprises a hidden transmission stage and an identity authentication stage, hidden transmission is achieved for passive attacks in the hidden transmission stage, privacy and security of data transmission are ensured, and the identity authentication stage is used for identity authentication; and in the identity authentication stage, the accuracy and security of identity authentication are further improved for active attacks.

The invention provides a broadband wide-angle tight coupling dipole array antenna working at a Ka wave band. The broadband wide-angle tight coupling dipole array antenna is composed of a plurality of antenna units arranged in a matrix mode. Each unit comprises a single-layer Rogers 5880 dielectric substrate, a bottom-layer metal floor, an upper-layer wide-angle matching layer and a tight dipole radiation layer; wherein the tail ends of vibration arms of the bow-tie-type dipole units are mutually overlapped to enhance coupling, the hyperbolic impedance transformers realize conversion from unbalance to balance and broadband matching, the short-circuit metal wires inhibit common-mode resonance, and the wide-angle matching layer is a frequency selective surface formed by rectangular metal patches. Passive edge units are additionally arranged on the two sides of the array, outer side short-circuit lines are removed to slow down the truncation effect, the metal wall and the floor are integrally machined, the active standing-wave ratio within 27.5-35 GHz is smaller than or equal to 2.1 when + / -50-degree scanning is supported, and the efficiency is larger than or equal to 80%. The antenna has the advantages of low profile, high integration, wide bandwidth angle and high radiation efficiency, and is suitable for a millimeter wave communication system.