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98 results about "Array gain" patented technology
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In MIMO communication systems, array gain means a power gain of transmitted signals that is achieved by using multiple-antennas at transmitter and/or receiver, with respect to single-input single-output case. It can be simply called power gain. In a broadside array, the array gain is almost exactly proportional to the length of the array. This is the case provided that the elements of the antenna are not spaced to a point at which large radiation side lobes form in other directions and that the array length exceeds one or two wavelengths. The power gain of a broadside array is nearly independent of the number of broadside elements as long as both of these conditions are met.
Array Antenna System and Spread Spectrum Beamformer Method
InactiveUS20090103593A1Simple designEasy to processMultiplex code generationRadio transmissionMultiplexingTransceiver
A method for transmitting digital beamformed signals in a transmit array antenna apparatus utilizing a single transceiver with one power amplifier, one up-frequency converter and one digital-to-analog converter for said array transmit antenna apparatus comprising the steps of: generating a first set of direct-sequence spread spectrum codes; generating a plurality of weights, each weight being a beamforming amplitude and phase or delay for each element; generating a direct-sequence spread spectrum multiplexed signal containing such weights while using one of such first-set codes per element; converting such an multiplexed signal to a convenient radio frequency; amplifying and transmitting such a multiplexed radio frequency signal to the elements; generating a second set of direct-sequence spread spectrum codes; extracting a radio frequency signal with direction-bearing weight information at each element while using a subset of codes from the second set; generating a third set of direct-sequence spread spectrum codes at each element; transmitting a signal with array gain beamformed towards a specific direction while using a transmit array apparatus composed of spaced elements, such a transmit beamformed signal being a radio frequency signal, a direct-sequence spread spectrum radio frequency signal containing a subset of codes from the third set, or a sequence of radio frequency pulses that have short duration and high power.
Owner:APPLIED RADAR
Dual-polarized phased array antenna with vertical features to eliminate scan blindness
InactiveUS20100007572A1Eliminate scan blindnessReducing broadside （non-scanned） array gainPolarised antenna unit combinationsAntenna feed intermediatesDipole antennaArray gain
A phased array antenna includes a substrate and an array of antenna unit cells formed on the substrate. Each antenna unit cell comprises first and second sets of coupled dipole antenna elements that are orthogonal to each other and provide dual polarization. A member is positioned at each antenna unit cell between each of the dipole antenna elements in each polarization to eliminate scan blindness without reducing broadside (non-scanned) array gain.
Owner:HARRIS CORP
Power control method of uplink multiple input multiple output channel
InactiveCN101998596APower managementTransmission control/equalisingMimo transmissionTransmitted power
The invention provides a method for solving uplink power control aiming at an uplink adopting MIMO transmission mode. The uplink transmitting power depends on the size of transmission block (or modulation coding scheme MCS), path loss, precoding vector type, bandwidth and base station expected receiving power (or signal to noise ratio) and the like. Uplink multi-antenna transmission is utilized, so that the base station obtains certain array gain and user equipment can correspondingly reduce uplink transmitting power; each transmission block of uplink transmission can share the same MCS parameter, the same array gain parameter or the same power adjusting parameter, or each transmission block has respective MCS parameter, array gain parameter and power adjusting parameter; under the conditions that the uplink adopts space multiplexing and CMP precoding vector is utilized, the actual transmitting power of antenna depends on the transmitting power of the layer where the antenna is transmitted; under the conditions that uplink adopts space multiplexing and CMF precoding vector is utilized, the transmitting power of antenna depends on the sum of transmitting powers of each layer where the antenna is transmitted actually, and the base station configures maximum transmitting power of each layer in a semi-static or dynamic way.
Owner:夏普高科技研发(上海)有限公司
Method for transmitting signal using multiple antennas
InactiveUS20140192768A1Increase capacitySite diversitySpatial transmit diversityMultiplexingSystem capacity
Disclosed is a method for transmitting radio frequency signals. In the method according to the present invention, a plurality of antenna groups may be arranged for achieving array gain and multiplexing gain at the same time, and the plurality of antenna groups are located far from each other so that they have no correlation, and antennas of the same group are located adjacent to each other so that they have correlation. Accordingly, system capacity as well as capacity of data channel and control channel may be significantly increased through mitigation of inter-cell interference and enhancement of cell edge performance.
Owner:ELECTRONICS & TELECOMM RES INST
Small-scale LTE multi-array antenna
InactiveCN106329116AGuaranteed network performanceShorten the lengthParticular array feeding systemsIndividually energised antenna arraysElectricityStrong coupling
The invention provides a small-scale LTE multi-array antenna. In the small-scale LTE multi-array antenna, each radiation unit comprises a dual-polarized oscillator and baluns, the dual-polarized oscillator comprises two separate dipoles, each feeding network employs a planar structure, feeding points between network ports are located in the same horizontal line, and the radiation units are placed by employing a strong coupling mode. According to the antenna, the strong-coupling radiation unit technology is employed, the spacing between the radiation units is shortened, and the length of the whole antenna is shorter; the low-profile radiation units are employed so that the height of the antenna is reduced, the overall size of the antenna is only 50% of the size of the same kind of product through comprehensive effect, the occupation of the antenna space is greatly reduced, and the gain of unit arrays is high; and the feeding networks with the integrated planar structures are employed so that the amplitude and the phase precision are high. According to the antenna, excellent performance of mobile communication can be guaranteed.
Owner:WUHAN HONGXIN TELECOMM TECH CO LTD
Transmission device and method for separated type asymmetric hybrid beam formation
ActiveCN105429686AReduce complexityImprove performanceSpatial transmit diversityEngineeringArray gain
The invention discloses a device and method suitable for separated type asymmetric hybrid beam formation in a high-frequency-band multiple input multiple output communication system. A transmitter adopts separated digital analog hybrid beam formation, data flow is mapped to different radio frequency links through digital precoding, each radio frequency link adopts a different phase shifter processing module to realize analog beam formation of the radio frequency link, and an array gain of a phased antenna array is utilized to resist channel fading; and a receiver adopts full-digital receiving, can fully utilizes array and diversity gains of the analog beam formation and multiplexing and diversity gains of digital beam formation under reasonable receiver complexity, thereby improving system performance.
Owner:南京易太可通信技术有限公司
Monolithic silicon-based phased arrays for communications and radars
A phased-array receiver is adapted so as to be fully integrated and fabricated on a single silicon substrate. The phased-array receiver is operative to receive a 24 GHz signal and may be adapted to include 8-elements formed in a SiGe BiCMOS technology. The phased-array receiver utilizes a heterodyne topology, and the signal combining is performed at an IF of 4.8 GHz. The phase-shifting with 4 bits of resolution is realized at the LO port of the first down-conversion mixer. A ring LC VCO generates 16 different phases of the LO. An integrated 19.2 GHz frequency synthesizer locks the VCO frequency to a 75 MHz external reference. Each signal path achieves a gain of 43 dB, a noise figure of 7.4 dB, and an IIP3 of −11 dBm. The 8-path array achieves an array gain of 61 dB, a peak-to-null ratio of 20 dB, and improves the signal-to-noise ratio at the output by 9 dB.
Owner:CALIFORNIA INST OF TECH
Quick beamforming method capable of improving array resolution and gain
InactiveCN101609150AImprove resolutionOvercoming demandsAcoustic wave reradiationComputation complexityComputation process
Owner:HARBIN ENG UNIV
Embedded smart skin antenna
ActiveCN103618130AGuaranteed electricityRealize working status self-diagnosisAntenna arraysAntenna supports/mountingsElectricityElectrical performance
The invention provides an embedded smart skin antenna which is formed by an optical fiber sensing network layer (2), a reconfigurable sub array (3), a thin film TR sub array (4), a reconfigurable feed network (5), and a control and function maintenance module (6). The optical fiber sensing network layer and the reconfigurable sub array are integrated as a whole, are sequentially and parallelly arranged with the thin film TR sub array (4) and the reconfigurable feed network in a laminated manner, and are jointly in parallel connection with the control and function maintenance module at the end. The control and function maintenance module, according to a user demand of a terminal main control device (7), sends a control instruction to the reconfigurable sub array, the thin film TR sub array, and the reconfigurable feed network; the working condition self-diagnosis of the embedded smart skin antenna and the electrical performance reconfiguration of the antenna are realized; the electric performance of the embedded smart skin antenna is ensured; and the defect that, after the sub array is partially damaged, a conventional antenna array is degraded in performance or cannot be reused is avoided. The embedded smart skin antenna also solves the defect that the array gain loss of a conventional phased array antenna is too large when the scanning angle theta is >= 45 DEG.
Owner:10TH RES INST OF CETC
Monolithic silicon-based phased arrays for communications and radars
Owner:CALIFORNIA INST OF TECH
Underwater motion array multi-target detection and position estimation integrated method
InactiveCN104330787AImprove angular resolutionEasy to detectAcoustic wave reradiationContinuous measurementArray gain
The invention relates to an underwater motion array multi-target detection and position estimation integrated method which is characterized by according to a motion array signal model, obtaining a twice-continuous-measurement reception data formula and obtaining phase correction factors; carrying out matrix-form block partitioning on the motion array signal model; by utilizing the synthetic aperture technique and utilizing the phase correction factors, extending a physical array into a virtual array and reconstituting the block matrixes into data matrixes to form MVDR spatial spectrum, and obtaining a detection threshold value through on-site noise study; and obtaining spectrum peak number above the detection threshold value which is regarded as the target number, and the angle corresponding to the spectrum peak is the azimuth angle of an incidence target. The method fully utilizes the underwater motion array synthetic aperture technique to improve array gain and angular resolution, and utilizes an MVDR spatial spectrum function for reflecting signal energy to determine the number of the targets and method; and compared with coherent signals, the detection performance of the method under low signal to noise ratio is obviously superior to that of the conventional method, detection threshold is reduced, farther detection distance is achieved, and position estimation value can be given.
Owner:HENAN UNIV OF SCI & TECH
Low-side-lobe beam pattern integrated design method based on convex optimization
ActiveCN106682405AImprove robustnessReduce sidelobeSpecial data processing applicationsSide effectBeam pattern
The invention discloses a low-side-lobe beam pattern integrated design method based on convex optimization. Auxiliary variables are introduced to achieve variable separation by adopting an alternative direction multiplier method (ADMM), a large amount of original inequality constraint limits are converted into solvable problems, iteration solution is performed by applying an ADMM thought, and accordingly parameters are determined to obtain an ideal wave beam, namely side-lobe values are reduced. The robustness of a wave beam forming device is good in the process by optimizing wave beam side lobes, the side effect of the side lobes on array gains is low, the obtained side lobe values are low, and the low-side-lobe beam pattern integrated design method is simple and simple in operation and has a very good practical value.
Owner:NORTHWESTERN POLYTECHNICAL UNIV
Uniform linear array low sidelobe beam forming optimization method under multiple constraints
ActiveCN111551923AFast convergenceLarge array gainRadio wave reradiation/reflectionSide lobeEngineering
The invention discloses a uniform linear array low sidelobe beamforming optimization method under multiple constraints, is applied to the field of array signal processing, and aims to solve the problem that the selection of a penalty factor initial value greatly influences the convergence rate of an algorithm when an existing ADMM algorithm solves the optimization problem, and the situation of slow algorithm convergence or non-convergence is likely to occur. The method comprises the following steps: firstly, establishing a uniform linear array receiving signal model, taking array gain as a target function, considering main lobe level, side lobe level and weight amplitude constraints, then maximizing the array gain by adopting an alternating direction penalty algorithm, and solving an optimal array antenna weighting coefficient. Compared with an existing ADMM algorithm, the method is higher in convergence speed and better in convergence effect.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
Radar coincidence imaging method with array gain-phase errors
ActiveCN106918810AImproving Imaging AccuracyImprove image qualityRadio wave reradiation/reflectionRadiation fieldIterative method
The invention provides a radar coincidence imaging method with array gain-phase errors. The technical solution includes the following steps: a first step of receiving a radar echo, a radar coincidence imaging system being configured to include N transmitting arrays and one receiving array, the transmitting arrays transmitting a group of independent transmitting signals at the same time; a second step of dividing grids, evenly dividing an imaging region into grids with a size decided by imaging resolution; a third step of deducing a radiation field, using the iterative method to compute a radiation field reference signal; a fourth step of constructing an object, computing an object scattering coefficient vector based on the result of the iterative computing; a fifth step of estimating gain-phase errors; and a sixth step of using the object scattering coefficient vector to performing imaging if the result of the iterative computing meets requirements. According to the invention, the method can conduct high precision imaging on an object in the presence of gain-phase errors.
Owner:NAT UNIV OF DEFENSE TECH
Subarray antenna structure suitable for millimeter wave LOS MIMO and design method
ActiveCN105896102AGuaranteed Spatial Multiplexing GainGuaranteed stabilityAntenna arraysMimo communicationSpatial multiplexing gain
The invention discloses a subarray antenna structure suitable for LOS MIMO and a design method. A transmitting terminal employs an array emission structure of antenna subarrays formed by phase shifters, and a receiving terminal employs an oriented reception structure symmetric to the transmitting terminal or an asymmetric omnidirectional reception structure. Normalization antenna subarray interval conditions that meet the requirement are obtained through theoretical calculation, maximal effective freedom degree of a radio frequency equivalent channel in point-to-point LOS MIMO communication is realized, and the top and bottom limitations on effective freedom degree are reasonably estimated. Compared with a non-array antenna structure, the subarray antenna structure takes asymmetric and symmetric antenna subarrays into consideration. Array gain is provided, and a certain spatial multiplexing gain under a multipath-missing channel environment is ensured.
Owner:白盒子(上海)微电子科技有限公司
Method, system and apparatus for uplink array signal processing
ActiveCN101483462AOptimum Array Gain SignalImprove stabilitySpatial transmit diversityBaseband system detailsCommunications systemState parameter
The invention discloses a method for processing downlink array signal, and is applied in a communication system comprising at leas two antenna arrays. The method of the invention can obtain better array gain signal and can increase the system stability. The method comprises the following steps: estimating at least one channel state parameter, comparing the estimated value of at least one channel state parameter with a corresponding preset threshold parameter value, confirming the mode for processing the downlink array signal according to the comparing result, and processing the downlink array signal according to the confirmed mode, wherein the mode comprises executing combined beamforming of at least two arrays to the downlink array signal or executing independent beamforming of at least two arrays to the downlink array signal. The invention also discloses a system for processing downlink array signal and a base station thereof.
Owner:DATANG MOBILE COMM EQUIP CO LTD
Digital predistorter for variable supply amplifier
ActiveUS20110032032A1Problem be addressAmplifier modifications to reduce noise influenceAmplifier modifications to reduce temperature/voltage variationAudio power amplifierEngineering
An adaptive predistorter for applying a predistortion gain to an input signal to be amplified by a power amplifier having a variable supply voltage, the predistorter including: a predistortion gain block adapted to apply a complex gain to a complex input signal; a first table implemented in a first memory and comprising a 2-dimensional array of cells storing complex gain values, the first table adapted to output the complex gain values based on an amplitude of the input signal and the value of the variable supply voltage of the power amplifier; and a second table implemented in a second memory and including a 2-dimensional array of cells storing gain update values for updating the complex gain values of the first table, the gain update values being generated based on an output signal of said power amplifier.
Owner:STMICROELECTRONICS SRL
Array antenna analog multi-beam forming method
ActiveCN108173578ALow hardware requirementsImplementing BeamformingSpatial transmit diversityGaining weightAmplitude control
The invention discloses an array antenna analog multi-beam forming method, and belongs to the technical field of array signal processing. Four multi-beam forming methods are provided and are suitablefor high-frequency directional communication and multi-directional detection of phase-controlled radar, which are respectively as follows: (1) when the ratio of beam gain requirements in two directions is given, performing phase-controlled beam forming; (2) when a greatest lower bound in the beam gains in two directions is given, performing phase-controlled beam forming; (3) when the ratio of thebeam gain requirements in the K directions is given, performing joint phase amplitude control beam forming; and (4) when beam gain weight factors in K directions are given, performing phase-controlledbeam forming. The above four methods achieve low-complexity millimeter-wave beam forming under different scene requirements, so that an array antenna in millimeter-wave communication can aim at multiple directions simultaneously and obtain the array gains in multiple directions at the same time so as to meet the simultaneous access of multiple terminal devices.
Owner:BEIHANG UNIV
Passive series-fed electronically steered dielectric travelling wave array
ActiveCN107949954AHigh gainHigh Hemispherical CoverageSimultaneous aerial operationsIndividually energised antenna arraysDielectricPatch array
The invention discloses a passive series-fed electronically steered dielectric travelling wave array. According to the invention, a low cost passive electronic scanning array based on a Dielectric Traveling Wave Array (DTWA) technology that uses micro-actuated control of a waveguide transmission medium feeding the array elements to steer the array beam. Array gain is achieved by coherently combining element outputs with very low loss, weighted waveguide directional couplers. By modifying the propagation delay of the dielectric-filled waveguide through the introduction of a variable air gap, the radiated phase of the coupled patch array elements is changed, steering the beam accordingly. Since the circuitry is passive and bi-directional, the same antenna array can be used on receive or transmit unlike an active phased array that requires transmit / receiver switching. The design has been validated at Ku-Band through brassboard testing and is scalable with simulation at Ka-Band, steering the beam over a Field of Regard (FoR) of + / - 50o with nearly uniform gain. The approach provides phase control without active components at each individual array element, which significantly reduces the cost of a phased array by at least an order of magnitude.
Owner:AMI RES & DEV
Planar multi-pole sub-vector receiving array system
ActiveCN103940504AImprove technical levelReduce operating frequencySubsonic/sonic/ultrasonic wave measurementArray elementEngineering
The invention relates to a planar multi-pole sub-vector receiving array system which can work within a low-frequency range of 20-1000 Hz and has high array gain and a small-size narrow beam. The planar multi-pole sub-vector receiving array system comprises nine vector array elements, a cylindrical voltage-resistant array body, an upper covering plate, a lower covering plate, twenty-seven signal amplification filtering circuit unit, a signal collecting unit, a power supply battery unit and a connecting wire, wherein the nine vector array elements are arranged into a 3*3 planar array on the upper covering plate of the cylindrical array body, an O-shaped ring is used for achieving watertightness between the array elements and the upper covering plate of the array body and is fixed through a bolt, the twenty-seven signal amplification filtering circuit unit, the signal collecting unit, the power supply battery unit and the connecting wire are arranged inside the cylindrical array body, and the whole system has no cable output. The planar multi-pole sub-vector receiving array system is small in size, light in weight and convenient to use, can obtain good array processing gain and an ideal wave beam width at a low-frequency stage, and can largely improve the technical level of a hydroacoustic detection system.
Owner:HARBIN ENG UNIV
Method for transmitting signal using multiple antennas
InactiveUS9503171B2Increase capacitySite diversitySpatial transmit diversityMultiplexingSystem capacity
Owner:ELECTRONICS & TELECOMM RES INST
Combined transmit beamforming method based on array antenna and MIMO
ActiveCN102223168AImprove reliabilityImprove spectrum utilizationSpatial transmit diversityTelecommunications linkFrequency spectrum
The invention discloses a combined transmit beamforming method based on an array antenna and MIMO (Multiple Input Multiple Output). The method comprises the following steps: (1) initialization; (2) obtainment of omni-directional channel state information; (3) obtainment of space real wave beam; (4) data transmission to first n wave beams; (5) equivalent channel estimation; (6) obtainment of virtual wave beam; (7) obtainment of combined BF (beamforming) performance number; (8) selection of optimal wave beam number send by AA-BF; (9) data transmission. According to the invention, diversity gain, reuse gain, and array gain brought by multi-antenna system are simultaneously obtained, the reliability of communication link is improved, the frequency spectrum utilization rate and throughput of a wireless communication system are increased to a maximum limit, the coverage scope of wireless communication is enlarged to a maximum limit, and the communication demands of a user under line-of-sight and non-line-of-sight conditions are simultaneously satisfied. Thereby, the communication quality of the user is improved, and the perception of the user is enhanced.
Owner:天元瑞信通信技术股份有限公司
MIMO sonar system
The invention relates to an MIMO sonar system comprising a transmitting end and a receiving end. A transmitting array of the transmitting end is divided into a plurality of subarrays, each subarray comprises a plurality of array elements, all array elements in each subarray transmit the same waveform, all subarrays transmit different waveforms, and therefore waveform diversities are formed; in the same subarray, transmitting wave beam forming can be realized via all array elements through weighting adjustment of phase positions, and transmitting array gain can be obtained; an echo signal received by each receiving array element is subjected to matching operation via a receiving array of the receiving end, orientation estimation can be performed according to a matching result, and an incidence angle DOA of each array element can be obtained. According to the MIMO sonar system, via subarray dividing operation, all subarrays transmit different waveforms, and therefore waveform diversities can be realized. In the same subarray, the transmitting wave beam forming can be realized through weighting adjustment of the phase positions, and transmitting array gain can be obtained. Each array element in the MIMO sonar system only outputs one waveform, and complex processing of superposition of a plurality of waveforms can be prevented; in terms of hardware, only slight adjustment of a transmitter system of a conventional sonar system is needed.
Owner:INST OF ACOUSTICS CHINESE ACAD OF SCI
Method, apparatus, and system for multi-antenna transmission
InactiveUS20120020334A1Reduce distractionsChannel capacityModulated-carrier systemsRadio transmissionSpectral efficiencyCombined use
Owner:SNAPTRACK
LTE (Long Term Evolution) frequency band multi-antenna-array gain compensation method
The invention discloses an LTE (Long Term Evolution) frequency band multi-antenna-array gain compensation method and provides a solution mainly aiming at LTE frequency band multi-antenna-array gain promotion. According to the LTE frequency band multi-antenna-array gain compensation method, a plurality of phase directors are introduced into different positions of arrays according to power distribution ratios of different oscillators under the premise that an original LTE frequency band multi-antenna-array structure (a baffle board, a feed network, the number of arrays, the number of oscillators, the array pitch, the oscillator pitch, a polarization mode and a power distribution ratio) is not changed; every list of the multiple antenna arrays comprises 1 to n phase directors; the phase directors are arranged right above the oscillators; the distance between the phase directors and the oscillators is h; the h is larger than or equal to 0.08lambda and larger than or equal to 0.35lambda; the phase directors of the multiple antenna arrays are cross-shaped or ring-shaped metal pieces; the size of the phase directors is smaller than half lambda; accordingly the gain of the array antenna is improved.
Owner:WUHAN HONGXIN TELECOMM TECH CO LTD
Virtual ultra-short baseline positioning method based on subarray division
The invention discloses a virtual ultra-short baseline positioning method based on subarray division, solves the problem of low underwater positioning precision of an existing ultra-short baseline positioning system under the condition of a low signal-to-noise ratio, and belongs to the technical field of ultra-short baseline positioning. The method comprises the following steps: S1, dividing a receiving array into four sub-arrays, and forming a group of virtual ultra-short baselines by reference centers of the four sub-arrays; S2, performing beam forming on the four sub-arrays to obtain arrayoutput signals of the four sub-arrays; S3, performing ultra-short baseline positioning by using the output signals of the four sub-arrays to obtain a target position. According to the invention, the array gain advantage of the array can be effectively utilized, and the position of the underwater target can be accurately estimated under the condition of low signal-to-noise ratio.
Owner:HARBIN ENG UNIV
Virtual array antenna signal generating method based on high-speed mobile communication
InactiveCN105871433ACompensate for Doppler ShiftHigh gainSpatial transmit diversityCommunications systemArray element
The invention discloses a method for generating a virtual array antenna signal based on high-speed mobile communication, which obtains a virtual array antenna with N array elements by phase shifting and uniform phase interval sampling of a single group of I and Q signals received by a single antenna Signals, and then by beamforming the virtual array signals, the communication system can obtain array gain without adding hardware resources, and also compensate for Doppler frequency shift. The invention is beneficial to realize the method of optimizing high-speed mobile communication performance without increasing hardware burden, and has the characteristics of high gain and high anti-interference ability.
Owner:GUILIN UNIV OF ELECTRONIC TECH
Low-power consumption wireless networking system
InactiveCN103648152AImprove reliabilityReduce Communication Energy LossPower managementHigh level techniquesThe InternetEngineering
The invention, which belongs to the fields of the internet of thins technology, the sensor technology, and the wireless communication and information acquisition technology, especially relates to a low-power consumption wireless networking system. According to an MIMO system, a channel gain matrix structure is used to obtain signal channels independent to each other, thereby realizing space multiplexing and increasing the channel capacity; and an array gain and a diversity gain are also obtained by using the antenna array space distance, thereby coping with wireless channel fading, enhancing wireless link reliability, and reducing the communication energy loss of a sending terminal. Therefore, compared with the SISO technology, the MIMO technology has the following beneficial effects: a high channel transmitting rate can be obtained under the circumstances that the energy consumption and the error rate are identical; and the communication power can be substantially reduced under the circumstances that the load and the error rate are fixed.
Owner:ZHENJIANG CITY XINGHE INTERNET OF THINGS SCI & TECH
Sparse array design method and device based on frequency domain broadband beam forming
InactiveCN110174656ALarge apertureDoes not change the output signal-to-noise ratioWave based measurement systemsCovarianceRadio frequency
The invention provides a sparse array design method based on frequency domain broadband beam forming. The method comprises the following steps: performing J-point discrete Fourier transform on a received signal to obtain J discrete frequency points, and then replacing J frequency band adjacent narrowband signals by using J discrete frequency point signals; taking a central frequency f0 as a reference frequency to obtain a focusing matrix T(fk) of each frequency point, focusing covariance matrixes of all the frequency points on the reference frequency by using the focusing matrix T(fk), and then averaging the covariance matrixes to obtain a focused received data covariance matrix; constructing an objective function from the perspective of maximizing the signal-to-noise ratio of the array output; optimizing the objective function; obtaining a final form of the objective function according to the optimized iteration expression of the objective function; and performing iterative solution to obtain an optimal sparse array, solving the weight and performing beam forming. The sparse array design method based on frequency domain broadband beam forming reduces the complexity of data processing, reduces the radio frequency cost, increases the freedom degree of the array and obtains the sparse array with optimal array gain.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
Conformal array two-dimensional beam optimization method based on convex optimization theory
ActiveCN112162266AReduce sidelobe levelGood beam directivityAcoustic wave reradiationAcoustic arrayInterior point method
The invention discloses a conformal array two-dimensional beam optimization method based on a convex optimization theory, and belongs to the technical field of underwater acoustic array signal processing. The method comprises the following steps of dividing a conformal array scanning space into a main lobe area and a side lobe area; initializing a half main lobe width, and setting a narrowest mainlobe width under an expected sidelobe level through iterative solution; and expressing a beam forming optimization problem as a convex optimization second-order cone constraint form, and solving an optimal solution of a weighted vector by utilizing an interior point method so as to obtain a uniform low-sidelobe two-dimensional beam response diagram. The two-dimensional beam diagram obtained in the invention has a lower sidelobe level, and the sidelobe is a uniform sidelobe so that beam directivity is more excellent. A constraint equation designed on the basis of an MVDR method enables two-dimensional beam forming to obtain a higher array gain compared with a traditional method. In addition, a constraint on a weighting vector norm enables the two-dimensional beam forming to have higher robustness compared with the traditional method.
Owner:NO 54 INST OF CHINA ELECTRONICS SCI & TECH GRP
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