370 results about "Band selection" patented technology

A tuner and a broadcasting signal receiver including the tuner. The tuner includes a band selection module that selects an RF broadcasting signal within the frequency band corresponding to a selected channel, and a low noise amplifier module that amplifies the signal with a specific received signal strength indicator (RSSI) to produce an RF broadcasting signal with a specific gain.

A tuner circuit includes a band selection filter coupled to receive an input RF signal and provide a band selected output signal where the band selection filter includes a bank of band pass filters. Each band pass filter includes an inductor and a variable capacitor forming an LC resonator where the inductor is an integrated planar spiral inductor. The tuner circuit further includes a frequency conversion circuit coupled to receive an input signal corresponding to the band selected output signal and provide a frequency converted output signal having a predetermined frequency. The integrated planar spiral inductor can be formed using a single metal spiral or multiple metal spirals. In a multi-spiral structure, a first metal spiral having an inward spiral pattern and a second metal spiral having an outward spiral pattern to form an inductor with large inductance, low series resistance and high Q values, even at low frequency.

Receivers accommodating frequency band selection methods in wireless communications systems are described. Different frequency bands are associated with different alternative carrier frequencies and/or base station cell and/or sector transmitter connection alternatives. Mobile node receivers include two receiver chains, each chain processing signals corresponding to a carrier. In some embodiments, each receiver chain includes its own controllable RF module, and individual carrier band selection is performed in each RF module. In some embodiments, the two receiver chains share a common RF module; however, each chain includes its own controllable baseband filter. In various embodiments, the first chain has higher complexity than the second chain. In most embodiments, each chain uses the same technology, e.g., spread spectrum OFDM or CDMA. Each chain obtains a quality indicator value on a different band and a comparison of quality indicator values is used in selecting the channel and carrier band for downlink traffic signaling.

Methods and apparatus for controlling events, timing and operational characteristics of wireless communications devices. An exemplary wireless communications apparatus comprises a baseband processor, radio frequency (RF) generating circuitry, a programmable event controller, and a memory device. The RF generating circuitry and programmable event controller are integrated in the same integrated circuit. The memory device, which may also be embedded in the same integrated circuit as the event controller and RF generating circuitry, is configured to store a sequence of instructions the event controller executes in response to a baseband command. The memory device is also configured to store control parameter data, which the event controller retrieves and uses to enable, disable, select and deselect various devices on the integrated circuit and to set, adjust or modify the operational characteristics of the RF generating circuitry (e.g., band selection and tuning) and other circuitry (e.g., power control circuitry) of the communications apparatus.

The different advantageous embodiments provide a system comprising a weather band selection process and a processor unit. The processor unit is configured to run the weather band selection process. The weather band selection process identifies a flight trajectory associated with an aircraft, identifies weather information for the flight trajectory, and identifies a weather band selection for the aircraft using the flight trajectory, aircraft information and the weather information.

It is possible to realize reduction of inter-cell interference by an adaptive FFR with a low delay. A terminal (200) includes: an interference condition detection unit (209) which detects an interference condition of other cell to the local cell; a cell identification unit (210) which acquires signals for cell identification of each base station; and a sub-band selection unit (211) which selects a sub-band used for the downstream line transmission to the local station according to the interference condition detected by the interference condition detection unit (209) and the signals for cell identification of each base station obtained by the cell identification unit (210). Thus, the terminal (200) can autonomously select a small sub-band of inter-cell interference and to realize reduction of the inter-cell interference by the adaptive FFR with a low delay.

The invention relates to a method for diagnosing the crop water deficit through a hyperspectral image technology, and especially relates to a method for diagnosing the Lycopersicon esculentum Mill. leaf area water based on hyperspectral images. The method comprises the following steps: 1, acquiring Lycopersicon esculentum Mill. leaf hyperspectral image data through a self-constructed hyperspectral imaging system; 2, selecting a characteristic wavelength by optimizing through an adaptive band selection process to realize multidimensional datum dimensionality reduction; 3, dividing the image ofeach sample at the characteristic wave, counter-rotating, carrying out form operation to obtain a target image, and extracting the leaf gray level and the leaf texture characteristic from the target image; and 4, selecting an optimal characteristic subclass through a GA-PLS (genetic algorithm-partial least square) process by fusing the gray scale and the texture characteristic and aiming at ten characteristic variables, and establishing a partial least square regression model based on the optimal characteristic, wherein the correlation coefficient R between a predicted value and a measured value of the model is 0.902. Compared with routine detection methods, the method of the invention has the advantages of rapid detection speed, and simple and convenient operation; and compared with a single near infrared spectroscopy or computer vision technical means, the method of the invention allows obtained information to be comprehensive, and the accuracy and the stability of the detection result to be improved.

The invention discloses a method and equipment for reporting and determining sub-band feedback selected by terminal equipment. The method comprises the following steps: base station equipment configures one or more channel state information progresses for the terminal equipment and configures a sub-band selection indication for the terminal equipment; the base station equipment transmits the sub-band selection indication to the terminal equipment; the base station equipment receives the feedback information reported by the terminal equipment and determines that the terminal equipment selects the feedback information of the sub-band feedback; the terminal equipment receives the sub-band selection indication which is configured for the terminal equipment by the base station equipment; and the terminal equipment selects the sub-bands by utilizing the sub-band selection indication and reports the feedback information by utilizing the selected sub-bands. In the embodiment of the invention, a sub-band selection dependence relationship of a plurality of channel state information progresses is configured, so that a plurality of channel state information progresses with different signal hypothesis and/or different interference hypothesis are fed back based on the same sub-band selection.

A tunable receiver is disclosed including a plurality of select filters to perform an initial band selection, a variable-gain low noise amplifier (LNA) whose gain is controlled to prevent its output power level to exceed a pre-determined power threshold, a plurality of digitally-tunable tracking filters to pass signals within a selected channel and to reject signals in a corresponding image band, a second LNA to further amplify the received RF signal and to generate differential signal outputs, a down converting stage which converts the received RF signal to an IF signal while rejecting signals in the image band, an IF trap to further reject undesired signals present at the output of the down converting stage, an IF amplifier to amplify the IF signal to compensate for losses, an IF filter to provide channel select and reject undesirable signals, and a variable-gain IF amplifier to amplify the IF signal and maintain its power level within specification.

An RF transceiver module for wireless communication devices includes a multi-layered substrate, an RF transceiver IC mounted on the multi-layered substrate for receiving and transmitting voice or data signals, at least one band selection filter mounted on the multi-layered substrate for filtering received RF signals, an antenna switch integrated in the multi-layered substrate which can be switched to transmit RF signals generated by the power amplifiers to the external antenna or to receive RF signals from an external antenna to the RF transceiver IC through the band selection filter, a plurality of passive devices embedded in the multi-layered substrate, and wiring embedded in the multi-layered substrate for electrically connecting the passive devices, the RF transceiver IC, and the band selection filter.

Radio-frequency (RF) power amplifiers driven by boost converter. In some embodiments, a power amplification system can include a supply system configured to provide a high-voltage (HV) supply signal based on a battery voltage, and a power amplifier (PA) configured to receive the HV supply signal and amplify an RF signal. The power amplification system can further include an output path configured to route the amplified RF signal to a filter. Such an output path can be substantially free of either or both of an impedance transformation circuit and a band selection switch.

The invention discloses a hyperspectral image band selection method based on low-rank expression to mainly solve the problem that complexity of hyperspectral data processing is high and classification accuracy of hyperspectral images is low. The processing procedure comprises: (1) obtaining hyperspectral data and carrying out normalization processing on the data; (2) carrying out low-rank expression on the processed hyperspectral data; (3) solving low-rank expression coefficient by the use of augmented Lagrangian multiplier (ALM); (4) clustering bands according to the low-rank expression coefficient; (6) selecting a representative band from each cluster to be used as a final selected band; and (6) classifying the selected band. According to the invention, redundant information between bands is eliminated, and the band containing large amounts of information is selected. The selected band is more beneficial to classification. Classification accuracy of hyperspectral images is raised, and complexity of hyperspectral data processing is also reduced. The method provided by the invention can be used in dimensionality reduction of hyperspectral data.

A light source device (20) comprises a first rotational filter part (23) in which a blue filter (23a), a green filter (23b), and a magenta filter (23c) can be disposed in a light path (LP), a second rotational filter part (24) in which an yellow filter (24a) can be disposed therein, and a band selection filter part (22) in which an NBI filter for limiting blue or green light to a narrow band can be disposed therein. The first and second rotational filter parts (23, 24) can be controlled so that in the case of normal light imaging, the yellow filter (24a) is disposed in the light path (LP) when the magenta filter (23c) is disposed in the light path (LP), and in the case of narrow band imaging, the NBI filter is disposed in the light path (LP), and the yellow filter (24a) is disposed in thelight path (LP) when the green filter (23b) is disposed in the light path (LP).

A tuner system for receiving a plurality of frequency bands includes a low noise amplifier coupled with a band selection filter to select a desired band. The tuner system further includes a complex RF filter to produce a complex RF signal from the selected band. The tuner system includes two double-quadrature converters, the first double-quadrature converter frequency down-converts the complex RF signal to a complex baseband signal. The complex baseband signal passes through a baseband filter that contains two identical lowpass filters for obtaining a baseband in-phase (I) signal and a quadrature (Q) signal. The second double-quadrature converter up-converts the baseband I and Q signals to respective IF I and Q signals that are significantly free of the positive third IF harmonic. The third IF-harmonic free I and Q signals are further processed by a complex bandpass filter. The bandpass filter has a programmable frequency center and a programmable bandwidth.

The invention discloses a wave band selection method for a hyperspectral remote-sensing image. The wave band selection method improves the traditional wave band selection method for the hyperspectral remote-sensing image, which is analyzed on the basis of the important point of a time sequence. The wave band selection method for the hyperspectral remote-sensing image comprises the following steps: firstly, on the basis of visual clustering tendency evaluation, clustering by a spectral clustering algorithm to reduce a clustering number search range and improve the clustering quality; then, when an important redundant wave band is finally reduced, removing parts of a high-redundancy wave band according to the condition mutual information among wave bands; and searching an optimal wave band combination with a branch and bound method to improve the classification precision and reduce a final wave band number. Compared with the prior art, the wave band selection method for the hyperspectral remote-sensing image, which is disclosed by the invention, has a bigger advantage on the aspects of finally-selected wave band numbers and the corresponding classification correction rate, and the required calculation time is far lower than calculation time required with most traditional methods.

The invention provides a hyperspectral image characteristic parallel extraction and classification method. By adopting three-dimensional spatial domain and frequency domain combination analysis, parallel characteristic extraction of three-dimensional and hyperspectral images is carried out, and then the characteristics are enhanced and integrated, and in addition, influences of noises on accuracy are greatly reduced by fully using rich information of high-dimensional data and a structural relationship between the characteristics. Various phases, directions, frequency domains, and three-dimensional space coding methods are deeply researched, and by starting from structural relationships between directions and frequencies of various Gabor characteristics, changing characteristics of signals of a spatial-spectral domain and the frequency domain are extracted in a combined way, and at the same time, an intelligent algorithm is innovatively introduced in waveband selection, and therefore under a precondition of guaranteeing identification accuracy, redundant information is reduced, identification efficiency is improved, and a wide application and popularization prospect is provided.

A transmission apparatus capable of improving overall throughput of a system by suppressing peaks using some frequencies in a communication band. In this apparatus, modulation section (102) adaptively modulates transmission data. Combination section (103) combines the waveform of the transmission data and the waveform of an inverse replica and suppresses peaks equal to or higher than a threshold. When there are peaks equal to or higher than a threshold, inverse replica generation section (112) extracts the waveform of a peak equal to or higher than the threshold and generates an inverse replica which is the waveform having the inverse characteristic of the extracted waveform. Where MCS is set for each subcarrier, sub-band selection section (114) selects the frequency of a subcarrier having large margin in reception quality and outputs the inverse replica within the range of the selected frequency to combination section (103).

The invention belongs to the technical field of hyperspectral remote sensing image processing and in particular provides a method for selecting hyperspectral remote sensing image bands based on partial least squares. The method has the following beneficial effects: based on the characteristic that components extracted by partial least squares maintain hyperspectral image variation information andhas high degree of correlation with classified information, the energy of the product of the spectrum matrix and the membership matrix is regarded as the standard of band selection and the recursive residual of the selected band is obtained through iteration to select the next group of bands to realize the process of band selection; the following defects of the traditional methods for selecting multispectral image bands can be effectively overcome: the computation complexity is high and relevant bands need to be removed; the hyperspectral remote sensing image classification experiment result shows that the hyperspectral remote sensing image has good classification effect after the method is used for selecting the bands; and the method has important application value for efficiently utilizing the information resources of the hyperspectral images.