27results about How to "Increase channel capacity" patented technology

The invention discloses a warm mix asphalt mixture and a preparation method thereof, and the warm mix asphalt mixture comprises the following components in parts by mass: 5-7 parts of pretreated SBS asphalt, 25-30 parts of modified fine aggregate, 45-60 parts of modified coarse aggregate, 8-12 parts of filler, 1-2 parts of warm mix agent, 2-4 parts of additive and 0.02-0.05 part of accelerant. The preparation method comprises the following steps: heating the pretreated SBS asphalt to 110-130 DEG C, sequentially adding the warm mixing agent and the additive in a stirring state, stirring, shearing, adding the accelerant, and then adding the modified fine aggregate, the modified coarse aggregate and the filler; the asphalt mixture disclosed by the invention is low in mixing temperature, the obtained asphalt mixture is resistant to aging, and the structural strength, the low-temperature performance, the salt corrosion resistance and the like of the asphalt mixture are all remarkably improved.

According to the high-frequency communication system assisted by the multiple intelligent reflecting surfaces and the deployment optimization method provided by the invention, the communication performance in a complex environment is improved by optimizing a multi-IRS (intelligent reflecting surfaces) assisted MIMO (multiple-input-multiple-output) system. The system solves the problem that a base station-user link is blocked, reduces path attenuation by using IRS single reflection, and introduces an orthogonal deployment strategy to ensure that an independent propagation path maximizes the system capacity. IRS element allocation and power allocation are optimized through an SCA (continuous convex approximation) algorithm, and channel capacity maximization is achieved. The method improves the system capacity, is efficient in optimization algorithm, low in deployment cost, green and environment-friendly, and is suitable for a next-generation efficient wireless communication system.

The invention discloses a satellite communication interference confrontation method and system based on the game theory, and the method combines a motion model and a communication interference model of a satellite, solves a Nash equilibrium point, optimizes the operation power and electromagnetic interference confrontation strategies of attackers and defenders, and improves the performance of the satellite communication interference confrontation when constructing a performance index. An attacker performance index and a defender performance index of each satellite are respectively established, and the operation power of a physical layer and the channel capacity of a network layer are considered, so that an attacker can reduce the communication capacity of a communication party to the greatest extent while keeping low-power operation, and the purpose of efficient interference is achieved; the channel capacity is related to the relative distance between the satellites, so that the interference satellites can utilize interference signals with lower power to achieve the attack purpose through control, the energy consumption of the satellites can be reduced, and the adaptability can be improved; and the communication party can increase the own communication capacity to the greatest extent while keeping low-power operation, so that the anti-interference purpose is achieved.

The invention relates to the field of antennas, and particularly discloses a dual-polarized antenna, which comprises a slot antenna layer for radiating a first polarized wave and a microstrip antenna layer for radiating a second polarized wave, wherein the slot antenna layer comprises a waveguide structure, the waveguide structure comprises a plurality of radiation units arranged along a first direction, and each radiation unit comprises a plurality of radiation slots extending along a second direction; the micro-strip antenna layer comprises a plurality of micro-strip oscillator units arranged along a first direction, and each micro-strip oscillator unit comprises a plurality of micro-strip oscillators arranged along a second direction; the microstrip antenna layer is arranged on the slot antenna layer, at least one microstrip array unit is arranged between the radiation units, and projections of the microstrip arrays and the radiation slots on the waveguide structure are not overlapped; the antenna is simple in structure, has the characteristics of low profile, miniaturization and light weight, can obtain the electromagnetic scattering characteristics of a target in different polarization directions, and is suitable for a high-frequency dual-polarized antenna.

The invention relates to an inductance-pass integrated hybrid beam forming method based on a one-bit digital-to-analog converter. The method comprises the following steps: designing an analog precoder and a one-bit digital-to-analog converter quantized signal passing through a digital precoder based on a trade-off optimization problem between radar and communication performance; a transmitting beam vector is designed according to the designed analog precoder and the quantized signal of the one-bit digital-to-analog converter, an optimization expression of the transmitting beam vector is solved, and an optimal transmitting beam vector is obtained; and designing an optimization problem of quantized signals of the analog precoder and the one-bit digital-to-analog converter according to the optimal transmitting beam vector, solving the optimization problem by using a Matlab toolbox and a BTSA-GA algorithm, and generating the sensing and communication integrated hybrid beam according to the optimized quantized signals of the analog precoder and the one-bit digital-to-analog converter. By adopting the method, the complexity and the power consumption of the large-scale MIMO system can be reduced.

The invention discloses a warm-mix asphalt mixture and a preparation method thereof. The asphalt mixture comprises, by weight, 5-7 parts of pretreated SBS asphalt, 25-30 parts of modified fine aggregate, 45-60 parts of modified coarse aggregate, 8-12 parts of filler, 1-2 parts of warm-mix agent, 2-4 parts of additive, and 0.02-0.05 parts of accelerator. The preparation method of the invention comprises the following steps: heating the pretreated SBS asphalt to 110-130°C, sequentially adding the warm-mix agent and the additive under stirring, stirring, shearing, adding the accelerator, and then adding the modified fine aggregate, the modified coarse aggregate, and the filler. The asphalt mixture of the invention has a low mixing temperature, and the aging resistance, structural strength, low-temperature performance, salt erosion resistance, and the like of the obtained asphalt mixture are significantly improved.

The invention discloses a dual-polarization multiplexing microwave perfect vortex metasurface and a construction method thereof, and the metasurface comprises a substrate which is of a regular polyhedron structure and has a certain thickness. The floor is arranged on the lower surface of the substrate. The patch is arranged on the upper surface of the substrate and comprises a cross-shaped structure which is orthogonally arranged in the center of the substrate and long-strip patches which are arranged on the four sides of the cross-shaped structure, and the four long-strip patches are not in contact with one another; the four vertexes of the cross-shaped patch are provided with short-strip patches perpendicular to the direction of the cross-shaped patch. The microwave perfect vortex is used for orbital angular momentum multiplexing communication, so that the divergence problem of traditional vortex waves can be effectively relieved, concentrated distribution of electromagnetic energy near an annular area with a fixed size on a receiving plane is achieved, the design of a receiving antenna is simplified, the receiving efficiency and the space utilization rate of the antenna are improved, and the cost is reduced. And the generation and multiplexing of the microwave perfect vortex are realized.

The present invention discloses a RIS-assisted sky-ground integrated network relay transmission method, which is characterized in that the method uses a ground base station node antenna to send an encoded radio frequency signal to the RIS, and transmits the encoded radio frequency signal to the RIS through the RIS. N After the amplitude and phase are adjusted by different reconfigurable surfaces, the high-altitude platform relay node receives the signal reflected by RIS, converts the radio frequency signal into an optical signal through the photoelectric converter, and sends it to the target satellite node through the FSO channel. The target satellite node receives the transmission signal, and realizes the RIS-assisted sky-ground integrated network relay transmission. Compared with the prior art, the present invention has the advantages of increasing the channel capacity of the system, reducing the interruption probability and bit error rate of the system, improving the communication performance of the system, alleviating the problem of tight radio frequency communication spectrum resources, and improving the link performance of the RIS-assisted sky-ground integrated network by reconstructing the channel using RIS.

The invention discloses an OAM silicon-based metasurface antenna, the OAM silicon-based metasurface antenna comprises a metasurface, a waveguide body and a fisheye lens, the waveguide body is used for receiving input energy, and the fisheye lens is used for converting the input energy into plane wave energy and uniformly feeding the metasurface. According to the OAM silicon-based metasurface antenna, a diffraction-free OAM wave beam can be constructed, so that a hardware basis is provided for realizing a mode division multiplexing technology utilizing the OAM wave beam, and the effect of improving the data rate and the channel capacity is further realized; besides, the antenna and the feed port in the OAM silicon-based metasurface antenna are on the same plane, so that on-chip integration can be realized, and the OAM silicon-based metasurface antenna can become an important component of a terahertz communication system with high integration level in the future. The antenna is widely applied to the technical field of antennas.

The embodiment of the present application provides a dual-dual-beam antenna, an antenna unit and an antenna system, wherein the dual-dual-beam antenna comprises: two dual-beam antennas arranged side by side on the same antenna array plane, and the beam directions of both are plus or minus 30 degrees, and the two dual-beam antennas each comprise a plurality of dual-polarization radiating units arranged in N1 columns and N2 rows, and the polarization directions of the plurality of dual-polarization radiating units are both plus or minus 45 degrees; wherein N1 is determined based on a first unit spacing of the plurality of dual-polarization radiating units corresponding to the beam direction in the horizontal direction of the antenna, and N2 is determined based on a second unit spacing of the plurality of dual-polarization radiating units corresponding to a preset grating lobe avoidance condition in the vertical direction of the antenna, and the dual-dual-beam antenna is a compact ultra-wideband antenna capable of realizing two dual-beam antenna arrays on the same horizontal plane, and achieves a doubling of the channel capacity compared to a dual-beam antenna of the same length, thereby effectively improving the capacity of the antenna system.

The present invention discloses a broadband, high-isolation six-unit MIMO slot antenna for 5G mobile terminals, wherein a metal floor is provided at the bottom of the rectangular dielectric substrate, and M "T"-shaped slots and N "T"-like slots are symmetrically cut on the surface of the floor; N antenna units are evenly provided on the top of the dielectric substrate, and each antenna unit is composed of two microstrip lines and a "T"-like slot corresponding to the floor. The microstrip line is composed of a metal material and loaded on the top of the dielectric substrate. The antenna units on both sides of the top of the dielectric substrate are distributed in mirror symmetry, and the distance between the antenna units on each side is the same. The present invention can cover the 3.3-5.1GHz frequency band, the isolation between antenna units can reach more than 16.2dB, the radiation efficiency exceeds 50%, the correlation coefficient is below 0.02, the antenna structure is simple, the size is small, and it has good practical value in mobile terminal communications.

The application relates to a carrier information modulation and demodulation method of a controllable resonant magnetic pulse through-the-earth communication transmitter, and the method comprises the following steps: generating a magnetic pulse signal through a hardware topology of a magnetic pulse signal transmitter, wherein the hardware topology comprises a switch, a unidirectional conducting switch, a resonant capacitor and a solenoid; dividing the working period of an LC resonant system into four stages by controlling the conduction and shutdown of the switch and the unidirectional conducting switch; generating a non-continuous magnetic resonant signal pulse by dynamically adjusting the duration of each stage; designing an information modulation mechanism based on orthogonal code elements, generating the waveforms of code element 0 and code element 1, and ensuring the orthogonality by verifying the autocorrelation and cross-correlation; and realizing information demodulation at a receiving end by calculating the cross-correlation between the input non-continuous magnetic resonant signal and code element 0 and code element 1. The application solves the contradiction between radiation efficiency and signal bandwidth which cannot be considered in the existing through-the-earth system and modulation and demodulation method.

This invention provides a demodulation method and system for free-space optical communication links based on helical fractional orbital angular momentum. N data streams are loaded onto a Gaussian beam, and at least one modulated beam of helical fractional OAM (Optical Aspect-Oriented Motion) is generated through a spatial optical phase modulation module. After coaxial beam combining, the beam is emitted in free space and imaged onto the demodulation phase modulation module plane via an optical relay imaging system. A conjugate helical phase map is loaded to demodulate the target OAM, and the focusing optics module is adjusted to couple the peak of the target OAM beam into a single-mode fiber, while non-target OAM beams are isolated. After verifying the demodulation isolation, the demodulation phase map is switched to sequentially recover each data stream. This invention achieves hybrid multiplexing of helical fractional and integer OAM, and achieves a mode isolation of ≥5dB through a dual isolation mechanism of phase conjugate demodulation and spatial optimal focusing. This improves fiber coupling efficiency and communication link robustness, significantly expanding the channel capacity and spectral efficiency of free-space optical communication.

The invention discloses a cooperative target recognition system based on a corner reflecting prism, and belongs to the technical field of target recognition, and the recognition system comprises a control processing unit, a light wave transmitting device, a reflected light receiving device, a corner reflecting prism and a rotation control device of the corner reflecting prism. The control unit can control the light wave emitting device to emit a light wave band with a specific frequency, then a receiver is provided with a circle of eight corner reflecting prisms capable of rotating along with a rotating shaft in the middle, and light waves generated by a sender are reflected to the receiver. The reflected light receiving device can identify different rotation frequencies of the corner reflecting prism by receiving reflected light waves, so that cooperative target identification can be accurately carried out, the reflecting prism of the device reflects signals with high reflectivity, 360-degree omnidirectional identification is realized, the system reliability is improved, on one hand, an invisible light identification technology can be adopted, and on the other hand, the system reliability is improved. Therefore, the recognition efficiency and accuracy are greatly improved, and the cooperative target recognition capability is enhanced.

The invention is applicable to the technical field of wireless communication, and provides a slotted cross dipole antenna loaded with an artificial magnetic conductor structure, which comprises three layers of dielectric substrates, namely a first layer of dielectric substrate, a second layer of dielectric substrate and a third layer of dielectric substrate; the two pairs of crossed dipoles are printed on the top and the bottom of the first dielectric substrate in pairs, the surfaces of the crossed dipoles are provided with slots, and each pair of crossed dipoles is connected through a microstrip line segment; the metal columns penetrate through the three layers of dielectric substrates to feed the crossed dipoles; the artificial magnetic conductor structure is printed on the top of the second-layer dielectric substrate; the low-profile broadband high-isolation dual-linear polarization microstrip antenna realizes the characteristics of low profile, broadband, high isolation and dual-linear polarization, and is suitable for the field of Internet of Things and wireless communication.

The present invention discloses a method for allocating drone resources based on a RIS model in a multi-layer drone cluster, and the implementation steps are as follows: 1. Install RIS on each drone of each layer of the multi-layer drone cluster network; 2. Obtain the channel characteristics of the composite channel; 3. Generate a probability density distribution; 4. Generate a power optimization model; 5. Solve the power optimization model, and the ground transmitter allocates power to each drone. The present invention solves the problem of small user capacity in the traditional multi-layer drone cluster resource allocation method by installing RIS on each drone of each layer. The present invention generates a probability distribution of instantaneous channel power gain of a multi-layer drone cluster based on the RIS model, and substitutes it into the power optimization model, so that the channel model and power allocation scheme of the multi-layer drone cluster can adapt to harsh environments.

The invention discloses a 16-7 probability forming method and device based on symbol-level labels, and the method comprises the steps: S1, carrying out the serial-to-parallel conversion of original data, and obtaining parallel bit data; s2, symbol-level label mapping is carried out on the parallel bit data, and parallel frequency domain signals are obtained; s3, carrying out IFFT (Inverse Fast Fourier Transform) on the parallel frequency domain signal to obtain a parallel time domain signal; and S4, shaping and filtering the real part and the imaginary part of the parallel time domain signal to obtain a symbol-level label probability shaping signal. The space utilization rate of the constellation is improved, the signal transmission power is remarkably reduced, and the transmission rate and channel capacity of the system are improved.

The invention discloses a multichannel quantum state feedback control method. The method comprises the following steps: S1, performing quantum state measurement by using an entanglement collective measurement method; s2, analyzing the state of the obtained quantum state information through a classical calculation method; s3, the processed information is fed back to the quantum system, and the state of the quantum system is adjusted; and S4, the state of the quantum system is monitored in real time, so that feedback control is adjusted in real time. According to the method, entanglement collective measurement is used, non-local measurement is carried out on multiple quantum system copies at the same time, so that the measurement efficiency and precision are improved, and the standard quantum limit is exceeded. According to the method, needed quantum resources can be reduced, weak signals are enhanced, sensitive detection on tiny changes is achieved, damage to the quantum state is reduced, in addition, entanglement collective measurement supports real-time feedback control, the state of a quantum system is allowed to be dynamically adjusted, and performance is optimized. And the problem of precision balance in multi-parameter measurement can be solved, and simultaneous optimal measurement of multiple parameters can be realized.

The invention discloses a medium-voltage ultra-wideband power line carrier coupling system adapting to a wide impedance range of a line, which belongs to the technical field of ultra-wideband medium-voltage carrier communication, and comprises a first Butterworth broadband filter and a second Butterworth broadband filter, the first Butterworth broadband filter is connected with a circulator, and the second Butterworth broadband filter is connected with a second Butterworth broadband filter. And the circulator is connected with the second Butterworth broadband filter, and the circulator is connected with a lantern ring type transmission line transformer. The device can adapt to medium-voltage line wide impedance conversion under ultra-wideband power line carrier communication, the amplitude-frequency and phase characteristics of signals in an OFDM communication mode under the ultra-wideband condition of 1.6-86 Mhz and 54 octave are met, and effective transmission and isolation of the signals in the ultra-wideband power line carrier communication are achieved.

The invention discloses a distributed cluster communication base station antenna dynamic adjustment method, which belongs to the technical field of wireless communication, and comprises the following steps: screening each base station to obtain a high-quality base station; any one of the high-quality base stations serves as a main station, the other high-quality base stations serve as substations, and the position of the main station, the positions of the substations and the signal receiving delay inequality of the substations relative to the main station are obtained; acquiring the position of a target signal source according to the position of the master station, the positions of the substations and the signal receiving delay inequality of the substations relative to the master station; continuously acquiring the position of a target signal source; acquiring the motion state of the target signal source according to the continuously acquired position of the target signal source; and according to the position and the motion state of the target signal source, adjusting the antenna direction of each base station to enable the antenna direction of each base station to directly face the target signal source. According to the method, the position and the motion state of the target signal source can be captured, dynamic adjustment of the base station antenna is realized, and the energy efficiency of distributed cluster communication is improved.

The utility model relates to the technical field of unmanned aerial vehicles, in particular to an unmanned aerial vehicle anti-interference antenna structure supporting edge AI real-time processing, which comprises an unmanned aerial vehicle body, a rotor spar, an orthogonal dual-polarization patch antenna, a double-cone spiral omnidirectional antenna and a communication system area covering multilayer shielding structure, and is combined with MIMO 8 * 8 beam forming and dynamic frequency adjusting technologies. According to the antenna, electromagnetic interference is effectively suppressed, the orthogonal dual-polarization patch antenna works at 5.8 GHz + / -200MHz, the unit spacing is greater than or equal to 0.75 lambda, the biconical spiral omnidirectional antenna supports 2.4-6GHz broadband matching, and the AI chip optimizes signal processing in real time. The utility model solves the problems of strong high-frequency interference and low transmission rate in the prior art, and is suitable for high-reliability communication in a complex electromagnetic environment.

The present invention discloses a Fabry-Perot cavity antenna with a wide 1dB gain bandwidth based on an artificial electromagnetic metasurface, and belongs to the field of antenna technology. The Fabry-Perot cavity antenna comprises three parts: a microstrip antenna, a partial reflecting surface, and an artificial electromagnetic metasurface above the partial reflecting surface. Among them, the partial reflecting surface has a phase increasing with frequency and a high reflection coefficient in the entire working frequency band; the artificial electromagnetic metamaterial surface above the partial reflecting surface is mainly used to improve the problem of low high-frequency gain caused by the resonance condition not being well satisfied in a broadband case. The present invention mainly increases the gain of the antenna in a broadband while ensuring the stability of the gain by loading a partial reflecting surface and an artificial electromagnetic metasurface above the feeding antenna. The antenna has the advantages of high gain, wide 1dB gain bandwidth, low profile, high directivity, low sidelobe level, etc., and has a high engineering application value in wireless communication applications.

The invention discloses a multi-path receiving fusion method for reducing the signal outage probability and a verification system thereof. The method comprises the steps of DMT signal modulation and OAM multi-path simultaneous modulation. Multiplexing the OAM mode group; performing multi-channel demodulation, fusion receiving and data analysis in an OAM mode group; the verification system comprises a user data modulation module on a carrier, an OAM mode modulation and propagation module and an OAM demodulation and offline processing module. The WCOF with a three-layer structure is designed and prepared, the RIC between the core layer and the cladding is smaller than 1%, the propagation loss of a supported vector mode is reduced, and the minimum effective refractive index difference between different OMGs can be obtained; the WCOF provided by the invention can be used for OMG multiplexing based on OAM, and has relatively low propagation loss; and the channel capacity of a multiplexing optical fiber system based on the OMG is improved, and the interruption probability of signals is reduced.

The present invention discloses a 2×2 dual-frequency, dual-circularly polarized, high-isolation Fabry-Perot cavity multi-input multi-output antenna and a processing method, belonging to the field of antenna technology. It is composed of four identical Fabry cavity antenna units arranged in a 90° rotation. The antenna unit consists of a feed antenna and a partial reflector. The feed antenna is a hybrid structure of a slot and a patch. The chiral metamaterial is used as a partial reflector unit to realize left-handed circularly polarized waves and right-handed circularly polarized waves. The broadband metamaterial absorber is introduced to improve the port isolation between adjacent antenna units. The antenna array has high isolation, high gain, dual-band, and dual circular polarization characteristics, and is suitable for modern mobile communication applications. The processing method comprises the following steps: pre-processing the feed antenna; processing the partial reflector; processing the absorber; placing a partial reflector above the feed antenna to form an antenna unit; rotating and arranging the antenna units into a MIMO antenna array; placing an absorber between each unit.

The invention discloses a desulfurized rubber modified asphalt and a preparation method thereof. The asphalt of the invention comprises, by weight, 100 parts of petroleum asphalt, 25 to 35 parts of desulfurized rubber powder, 0.2 to 2 parts of an oxime sulfonate modifier, and 0.5 to 3 parts of a modified artificial zeolite; wherein the raw materials of the desulfurized rubber powder comprise waste rubber powder, calcium nitrate, aniline, 2,5-benzothiazole dithiol, p-methylphenyl magnesium bromide, diphenyl sulfoxide, and trimethylchlorosilane in a weight ratio of 80 to 100:10 to 20:20 to 30:5 to 10:5 to 6:1:3 to 4; the invention also discloses a specific preparation method of the desulfurized rubber powder; the asphalt of the invention has simple components, not only various properties are improved, but also the mixing temperature is low and the use is more convenient.

This invention discloses a reinforcement learning-based method for optimizing the performance of FAS-assisted satellite-to-ground communication. In air-to-ground communication, when the direct path is blocked by obstacles, the signal is transmitted through a mixture of reflection from moving scatterers and the direct path. This invention describes the communication environment between the mobile transmitter and the ground user through geometric stochastic modeling, establishes a dynamic optimization framework based on FAS, couples satellite motion characteristics with adjustable FAS parameters to construct a three-dimensional channel model, designs an improved Memetic PPO reinforcement learning algorithm to dynamically optimize the FAS configuration set at the ground user in the discrete action space through a local search mechanism, and jointly optimizes channel capacity and modeling accuracy to generate the optimal strategy. This method reveals the nonlinear relationship between satellite motion and channel characteristics, significantly improves communication performance in complex obstruction environments, provides a new method for dynamic channel optimization of satellites, and has significant application value.

The present invention discloses a multi-user millimeter wave radar anti-interference method based on waveform integrated design, comprising: (1) each millimeter wave radar reads its own working parameters and compiles them into pilot information; (2) the pilot information is divided into first pilot information and second pilot information, and the first pilot information is superimposed on the millimeter wave radar signal through frequency division design and then transmitted; the second pilot information and the millimeter wave radar signal are respectively transmitted through beam division design; (3) the signals transmitted by other millimeter wave radars are received and the pilot information is separated; (4) a time-frequency diagram is obtained through short-time Fourier transform, and whether there is interference between the radars is determined according to the time-frequency diagram. If there is interference, the parameters of the waveform are optimized according to the cost function; (5) the working parameters of each millimeter wave radar are updated and new pilot information is generated with time T as a period, and steps (2)-(4) are repeated. The present invention improves the anti-interference capability of the millimeter wave radar system.