98 results about "Array gain" patented technology

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.

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.

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.

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.

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.

The invention provides a quick beamforming method capable of improving array resolution and gain, comprising the following steps: adopting the construction of a minimum redundant array to optimize an M-element uniform linear array into a P-element non-uniform linear array; carrying out FFT processing on primitive data of a P-element array; in a frequency domain, constructing a covariance matrix of data based on the uniform linear array in accordance with the array aperture extension characteristics of fourth-order cumulants; carrying out normalization processing on the beam space and carrying out estimation on a Bartlett spatial spectrum. By adopting the array aperture extension characteristics of the fourth-order cumulants, the invention realizes that the optimized element layout form is employed to obtain high resolution and overcomes the defects of high requirements of the original fourth-order cumulant-based methods on snapshots and great computational complexity to enable the computation process to be simple and easy to operate. When the signal to noise ratio is higher than the supercritical signal to noise ratio, the method of the invention has higher array gain than that of conventional beamforming. The normalization processing of the beam space realizes effective inhibition to background interference. The beamforming method of the invention is simple and easy to operate and is especially suitable for project application.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.