16results about How to "Increase channel capacity" patented technology

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 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 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 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 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.