93 results about "Frequency band" patented technology

The invention discloses a method and a device for transmitting control information, and provides a diversity transmission model-based control information transmitting mode. The method for transmitting the control information comprises the following steps of: ensuring that each enhanced-control channel elements E-CCE for transmitting an enhanced-physical downlink control channel (E-PDCCH) comprises a plurality of enhanced-resource element groups (E-REGs) with the same quantity, and the E-REGs of each E-CCE are respectively assigned to different frequency RB (resource blocks); and bearing each downlink control information (DCI) transmitted on the E-PDCCH into at least one E-CCE to be transmitted. Each part in one DCI is respectively borne on a plurality of different frequency bands which correspond to the E-PDCCH to be transmitted, so that the transmitting stability and reliability of the DCI can be improved.

A communication apparatus capable of improving the spectrum usage rate of a system, especially, the spectrum usage rate in connection with both a fast fading and a channel estimation error as compared with the conventional sub-band adaptive method, while reducing the degree of the difficulty in achieving the adaptation, and further reducing the feedback overhead. In this apparatus, a sub-band group AMC parameter selecting part (318) selects an AMC parameter of each sub-band. An adaptive reception control part (503) must control an adaptive demodulating/decoding part (311), while controlling a parallel/serial converter (312) in a stage preceding the adaptive demodulation and decoding processes, and combining received symbols in the same sub-band group for demodulation and decoding.

The composite sound-absorbing device of the present invention includes a perforated board having a number of first pores thereon, a back board and side boards, the perforated board, back board and side boards forming a closed cavity, wherein: at least one or more of the resonant cavities being located within the closed cavity; at least one or more of second pores being located on the resonant cavities; at least one of the second pores being connected with the closed cavity; the resonant cavity having a volume of V=10 mm³ −1×10¹⁰ mm³, having a thickness of 0.05 mm-10 mm, the second pores having an aperture of d′=0.05-100 mm, with a perforation rate σ′=0.01%-30%. The present invention is beneficial to improve the effect of sound-absorbing and expand the frequency band of sound-absorbing.

In an oversampled orthogonal frequency-division multiplexing (OFDM) orthogonal network, the preamble used for time synchronization does not have an ideal autocorrelation function due to guard bands, which degrade the accuracy of symbol timing. Therefore, a zero-correlation-zone (ZCZ) based preamble is used for time synchronization. Across correlation function (CCF) used for time synchronization is forced to 0 within a certain region around a main lobe. The length of the ZCZ is guaranteed to be larger than a cyclic prefix length of OFDM data symbols synchronization accuracy.

A network node, a wireless device and a respective method performed by the same in a wireless communication network employing heterogeneous frequency band types, the network node being operative to serve wireless devices in a non-licensed frequency band and in a licensed frequency band, the network node serving a wireless device in a non-licensed frequency band are provided. The method in the network node comprises configuring (110) a fallback carrier in the licensed frequency band to the wireless device, wherein if the network node determines that the wireless device should switch to the licensed frequency hand, the method comprises handing over (130) the wireless device to the fallback carrier.

To perform volume control matching the actual auditory sensation level of a human so as to improve the control accuracy. As shown in FIG. 1, an audio gain adjustment device 10 includes: an audio signal input section 12 that acquires an audio signal to be adjusted; a long-term gain reflection section 14 that reflects the adjustment of long-term gain in the acquired audio signal; a frequency division section 20 that divides the audio signal from the long-term gain reflection section 14 into three frequency bands; a short-term gain reflection section 30 that reflects the adjustment of short-term gain in each frequency band; a synthesis section 40 that synthesizes audio signals output from the short-term gain reflection section 30; and an audio signal output section 42 that outputs the synthesized audio signal.

A passive optical network (PON) including an optical line termination (OLT) and a plurality of optical network units (ONUs) which are connected. The optical line termination includes a band setting control section; an upstream control cell receiving section; a use right transmitting section; and a downstream control cell transmitting section. Each of the plurality of optical network units includes a downstream control cell receiving section; a use right acquisition determining section; and an upstream control cell transmitting section.

A master unit and a remote unit is provided for a multiband transmission system for distributing and combining signals of at least one wireless communication network and at least one digital network. A reference frequency generator is arranged in the master unit, the reference frequency generator being designed to clock a master modem for converting the signals of the at least one digital network. The reference frequency signal emitted by the reference frequency signal is restored via a reference frequency receiver and is used for closing a remote modem that is located there for demodulation.

An ultra wideband active antenna platform can be deployed globally. A plug-and-play radio unit is removably attached to an outside of the active antenna. The PAPR can be removably plugged into a docking station to provide different technology or frequency bands specific for customers in different regions without the costly replacement of the whole antenna.

In addition, the heat-generating sources (power amplifiers) with heavy heatsink structures are separated from the main antenna body, so that the whole active antenna can be installed separately since the installation weight of the antenna would be reduced.

The invention relates to a prediction method for fractured oil-gas reservoirs based on three-dimensional seismic data and a fractional-frequency ant body technology. The method comprises the following steps: transforming the seismic data to a frequency domain to obtain the scope of an effective seismic frequency band; starting from the minimum value of the effective seismic frequency band to increase at intervals to obtain a fractional-frequency data series; computing the phase spectrum of each sampling point to obtain a discrete fractional-frequency phase data volume; adopting an ant body algorithm to generate a series of fractional-frequency ant body data; conducting horizon picking on an objective reservoir to obtain the time structure data of each time point location of seismic reflected waves; respectively extracting numerical values corresponding to an objective interval from a series of fractional-frequency ant body data to obtain a group of fractured reservoir detection results of different frequency bands of the objective interval. The computing method is simple and convenient and can be used for detecting smaller scale of faults and fracture zones, the precision is higher, and the geological effect is obvious.

The invention provides a power line carrier modulation method, a demodulation method, a circuit and a chip. The modulation method comprises the following steps of: detecting narrow-band nongaussian noise frequency in a power line; selecting non-noise frequency from a preset carrier frequency band as modulation carrier frequency; generating a modulation carrier according to the modulation carrier frequency; modulating a digital signal to be modulated to the modulation carrier to generate a power line carrier signal. By using the modulation method, the narrow-band nongaussian noise frequency can be avoided, the change of noise environment of the power line can be adapted, and the quality of power line communication can be improved.

The invention discloses a piezoelectric power generation device. The piezoelectric power generation device comprises an outer frame, a main cantilever beam, a mass-adjustable main mass block, two second-level cantilever beams and two mass-adjustable second-level mass blocks; the main cantilever beam, the main mass block, the two second-level cantilever beams and the two mass-adjustable second-level mass blocks are respectively located at the inner side of the outer frame; one end of the main cantilever beam is connected with the outer frame; the other end of the main cantilever beam is connected with the main mass block; the main mass block is connected with one end of each of the second-level cantilever beams; the other end of each of the second-level cantilever beams is connected with one second-level mass block; and the main cantilever beam and the second-level cantilever beams are respectively a metal frame of which the upper surface and the lower surface are both provided with a piezoelectric unit. According to the piezoelectric power generation device of the invention, one main cantilever beam and two second-level cantilever beams are adopted to form a three-degrees-of-freedom piezoelectric beam structure, so that the work bandwidth of the piezoelectric generator can be broadened through the plurality of cantilever beams with different resonant frequencies; and the mass of the main mass block and the second-level mass blocks can be decreased or increased according to actual situations, and therefore, resonant frequencies can be adjusted flexibly. Thus, the piezoelectric power generation device of the invention can be applied to environments with different resonant frequencies.

The present invention provides a hearing aid capable of detecting contact vibration noise from a collected sound signal. A hearing aid (100) is provided with two microphones (110-1, 110-2), a vibration component extracting unit (120) which extracts from collected sound signals respectively obtained by the two microphones (110-1, 110-2) an uncorrelated component between two collected sound signals as a vibration component for each frequency band, a vibration noise identifying unit (130) which determines whether or not a contact noise occurs based on the vibration component for each frequency band extracted by the vibration component extracting unit (120), an acoustic signal processing unit (140) which, when generating an acoustic signal by hearing aid processing of the two collected sound signals, processes the acoustic signal depending on the presence or absence of the occurrence of the contact vibration noise, and a receiver (150) which converts the acoustic signal to sound.

The invention discloses a monolithic integration composite range vector hydrophone. The current vector hydrophone can not measure various kinds of frequency signals in one test process because of mutual restriction of sensitivity and an effective work frequency band. By using the vector hydrophone of the invention, the above problem can be solved. The vector hydrophone comprises: a field-shaped support, elastic beams and mass blocks which are suspended on middle parts of four little box bodies of the field-shaped support respectively. Four sides of the each mass block are fixed with the field-shaped support through one elastic beam respectively. A terminal and a root of the each elastic beam are integrated with piezoresistors with a same resistance respectively. The middle parts of the four mass blocks are vertically provided with cilia cylinders with a same diameter respectively. The four cilia cylinders have different lengths. In the invention, through the four cilia cylinders with different lengths, sound signals in different measuring range scopes can be detected. The vector hydrophone can be used for determining a variable frequency value. And the effective work frequency band can be widened.

A fluid flow system (300) is provided. The fluid flow system (300) includes a pipeline (302) with a flowing fluid. The fluid flow system (300) further includes a first vibrating meter (5) including a first sensor assembly (10) located within the pipeline (302) and configured to determine one or more flow characteristics, including a first flow rate. A second vibrating meter (5′) including a second sensor assembly (10′) located within the pipeline (302) is provided that is in fluid communication with the first sensor assembly (10) and configured to determine one or more flow characteristics, including a second flow rate. The fluid flow system (300) further includes a system controller (310) in electrical communication with the first and second vibrating meters (5, 5′). The system controller (310) is configured to receive the first and second flow rates and determine a differential flow rate based on the first and second flow rates. The system controller (310) is further configured to compare the differential flow rate to a threshold value or band and correct one or more flow characteristics if the differential flow rate is less than a threshold value or band.

Provided is a wireless communication device capable of communicating a signal in a first frequency band and a signal in a second frequency band, which is lower in frequency than the first frequency band, including: a plate-like object; a first integrated circuit which has a function of communicating in the first frequency band; a first conductive object which is connected to one of two input/output terminals of the first integrated circuit; a conductive object group constituted of a plurality of second conductive objects at least one of which is connected to another of the two input/output terminals of the first integrated circuit; a second integrated circuit which has a function of communicating in the second frequency band; and a coiled conductive object of which a winding start side is connected to one of two input/output terminals of the second integrated circuit and a winding end side is connected to another of the two input/output terminals of the second integrated circuit. The conductive object group and the coiled conductive object are formed on opposite faces of tile plate-like object from each other. In a perspective view from a normal line direction of the plate-like object, a half or more of the coiled conductive object overlaps with the conductive object group.

The invention discloses a conductive plastic for processing a power supply cover plate, and a fabrication method of the power supply cover plate. The conductive plastic comprises the following raw materials by weight percentage: 50-60% of high-polymer base material, 15-25% of conductive filler, 15-20% of fire retardant and 1-5% of flexibilizer. According to the conductive plastic for processing the power supply cover plate, and the fabrication method of the power supply cover plate, the fabricated power supply cover plate is 40-50% lighter than the traditional aluminum cover plate; the acid-base corrosiveness resistance is high; the resistivity is adjustable; the shielding effectiveness of various frequency bands can be adjusted by changing an additive amount of the conductive filler; forming is convenient; secondary processing is not required; and compared with the aluminum cover plate, the total cost is lowered remarkably.

An embodiment of the invention relates to the technical field of communication and discloses a network access control method and equipment. The method comprises the following steps: whether a VoLTE( voice over long term evolution) voice signal is input into terminal equipment is monitored; if yes, whether a signal of the WIFI(wireless fidelity) network of the terminal equipment gets poorer is judged; if yes, voice service gets back to a circuit switched network from a packet switched network of the VoLTE, so that a voice call requested by the voice signal can be completed. With implementation of the embodiment, when the VoLTE voice signal interferes with the WIFI signal, the voice service gets back to a data exchange network for proceeding, adjacent frequency band interference of the LTE signal and the WIFI signal can be avoided, and quality of WIFI data transmission and quality of the voice call are guaranteed.

The invention relates to a multi-frequency antenna, which comprises a ground plane, a radiation conductor, a parasitic conductor and a feed-in wire, wherein the radiation conductor comprises a feed-in part, a first radiation arm and a second radiation arm; the feed-in wire comprises a central wire and an external wire; the feed-in part is provided with a coupling edge; the parasitic conductor is connected with the ground plane and provided with a coupling edge which is arranged along a profile of the coupling edge of the feed-in part, and a gap is formed between the coupling edge of the parasitic conductor and the coupling edge of the feed-in part; the central wire is connected with the feed-in part; and the external wire is connected with the ground plane. The low-frequency resonance mode is excited through the first radiation arm and the second radiation arm and the high-frequency resonance mode is excited through the parasitic conductor, so that an antenna system integrally covers various operation frequency bands and has the characteristic of ultra wide band; and simultaneously the composition structure of the antenna is simplified.

The invention discloses a broadband microwave frequency source circuit with low phase noise. The reference frequency is input into a digital phase detector and a low phase noise amplifier respectively. The output end of the digital phase detector is connected with the input end of a passive loop filter, and the output end of the passive loop filter is connected with the first end of a plurality ofactive loop filters respectively. The output of the low phase noise amplifier is connected to the input of the sampling phase detector. The output of the sampling phase detector is connected to the input of the first set of multiplexers, the output terminals of the first group of multiplexers are respectively connected with the second terminals of a plurality of active loop filters, the third terminals of the plurality of active loop filters are respectively connected with the input terminals of the second group of multiplexers, the output terminals of the second group of multiplexers are respectively connected with a plurality of VCOs, and a plurality of VCOs select one output. The selected VCO output signal is fed back to the sampling phase detector as the system output and fed back tothe digital phase detector through the N divider. The invention realizes the effects of wide frequency band and low phase noise.

The invention provides a mobile video monitoring system based on cognitive radio. The mobile video monitoring system comprises a control center and a mobile terminal. The control center is wirelessly communicated with the mobile terminal through an ISM frequency band. The control center is used for monitoring communication quality and determining whether spectrum sensing and channel switching need to be carried out or not according to the communication quality. If data transmission between the mobile terminal and the control center cannot be recovered through the channel switching, the data transmission of the mobile terminal is relayed through a relay robot. The invention further provides a mobile video monitoring method. According to the mobile video monitoring system and the method, the unfixed communication frequency band is adopted, and in the ISM frequency band, channel interference is automatically sensed and avoided, and the interference problem is solved. The wireless signal fading problem is solved through power control and relay transferring, and therefore the real-time performance and reliability of video transmission are guaranteed. The mobile video monitoring system and the method do not depend on the coverage of the commercial wireless network, and have actual application significance in video monitoring in the emergency environment, the severe environment and the unknown environment.