237 results about "Frequency coverage" patented technology

A method and apparatus for using a guard band as a data subcarrier in a communication system supporting frequency overlay are provided. In a method of operating mobile station for using a guard band as a subcarrier for signal transmission in a communication system supporting frequency overlay, the method includes searching for a first center frequency located at a position corresponding to an integer multiple of a subcarrier spacing, after searching for the first center frequency, receiving information indicating the numbers n1 and n2 of first additional subcarriers, and performing a first network entry process by using all subcarriers including the first additional subcarriers.

The invention discloses a method for achieving multi-frequency coverage of a wireless sensor network based on time division multiplexing, wherein the method employs two communication methods, namely, time division multiplexing and frequency division multiplexing, so that the method makes up for disadvantages that the traditional wireless sensor network has low communication rate, small node number, low data transmission reliability and the like. The invention designs a wireless sensor network receiving node with two frequency communication, wherein one frequency is used for signaling communication and the other frequency is used for data communication; the wireless sensor node builds connection with the signaling frequency of the wireless sensor network receiving node and then distributes time slot, and performs frequency hopping to a designated data frequency to perform wireless communication of the time division multiplexing. The wireless sensor network receiving node finally sends data to a remote server. The wireless sensor network has the advantages of high reliability, short adding time, fast network rate and a large number of received nodes, so that the invention is suitable for the wireless sensor network with high requirement for data transmission reliability or transmission rate.

A system and method for designing a broadband tuner such that VCO pulling is minimized and gaps in frequency coverage are avoided, while total power consumption is reduced, is disclosed. A broadband spectrum is divided into sub-bands and various multipliers to a local oscillator output are introduced. In this fashion, the present invention allows a local oscillator within the broadband tuner to always generate signals that lie outside of the broadband spectrum for a particular broadband application. Additionally, a modulus ratio for a dual modulus prescaler with the local oscillator is maximized, thereby reducing power consumption.

The invention discloses a reversed-U-type dielectric waveguide wideband directional coupler used for a millimeter wave circuit, which is composed of two medium waveguide transmission lines and an earthing metal plate, wherein two medium waveguide transmission lines close to each other are oppositely bent, arranged separately and symmetrically at two sides of an axle wire and fixed on the earthing metal plate, so as to form an X-type structure; the coupler is characterized in that the reversed-U-type medium waveguide is used for reaching of the wideband plat coupling of the coupling section and the transition section of a coupler, and the waveguide axes of the transition section adopts hyperbolic tangent line type; the fluctuation of a coupling coefficient doesn't exceed plus or minus 0.5Db inside the frequency coverage of 6GHz, and the flat coupling property can be achieved inside wider bandwidth. Compared with the traditionally directional coupler which is completely composed of a medium mirror image line, the inverted-U-type dielectric waveguide wideband directional coupler has the advantages that transition waveguide section of the hyperbolic tangent line type is used, the metal side wall of the prior coupler which is vertical to ground in the transition waveguide section is unnecessarily used, radiation loss and metal loss are reduced, the volume of the coupler is decreased and manufacture complexity and cost are reduced, and can be conveniently produced in large quantity.

A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. If a dwells assigned frequency bandwidth is small and not a multiple of the minimum frequency spacing between dwells (tuning step), then coverage gaps can be inadvertently introduced between adjacent dwells. A system and method are provided for detecting this condition and generating dwells without accidental loss of frequency coverage for any combination of bandwidth and step size.

The invention belongs to the field of acoustic metamaterial and discloses an acoustic wave focusing device based on an intrinsic displacement mode. The acoustic wave focusing device is a metallic ring-like structure and immersed in water, the metallic ring-like structure is made of copper, iron, steel, aluminum, zinc, gold, silver, nickel and synthetic metal; the acoustic wave focusing device is excellent in acoustic focusing effect, and energy is centralized because the focus is arranged at the central point of the ring-like structure; the frequency coverage area is wide, and the focusing frequency is changed in the range from 100Hz to 1GHz; the acoustic focusing effect is wide in application range and applied for the circular-ring, square or elliptical-ring structure; the acoustic wave focusing device is simple in structure, easy to realize, process and integrate, and proper in size.

A frequency overlay communication system that includes a first communication system for performing communication using a first frequency band being a preset bandwidth; and a second communication system for performing communication using a second frequency band being a second preset bandwidth, wherein the second frequency band includes the first frequency band.

A system for performing cell acquisition in a frequency overlay communication system having a first frequency band and a second frequency band including the first frequency band. A base station (BS) generates a reference signal used for identifying a cell using a specific sequence in a predetermined frequency band, and transmits the reference signal. A mobile station (MS) receives the reference signal to determine whether the BS uses the first frequency band or the second frequency band, determines a reference signal having a maximum correlation value through correlation calculation with at least one predefined sequence, and detects a BS identifier (ID) corresponding to the determined reference signal.

The invention relates to a low-temperature co-fired ceramic ultra-wideband micro filter, comprising input and output interfaces suitable for pasting on a surface; input and output inductors; nine parallel resonance units implemented by three-layer folded coupling strip line and comb type coupled resonance structures; and eight groups of enhanced coupling diaphragms with resonance levels which are directly connected with each other, the structures are implemented by multi-layer low-temperature co-fired ceramic technology. According to the invention, the low-temperature co-fired ceramic ultra-wideband micro filter has the advantages of wide frequency coverage, low insertion loss, good controllability, small volume, light weight, high reliability, good electrical property, good phase frequency characteristic linearity, good temperature stability, low cost and mass production, and is particularly applied to fields of millimeter wave communication, microwave navigation, guidance, telemetry, remote control, satellite communication and military confrontation, and corresponding frequency range systems having excessive demand on volume, weight, electrical property and reliability.

The present invention discloses a mobile terminal antenna multiplexing system and a control method thereof and a mobile terminal. The mobile terminal antenna multiplexing system comprises a radiatingbody, multiple antenna accesses, a CPU processor and a radio frequency module, each antenna access comprises one feed point, one matching module and one switching module. The antenna radiating body ofthe mobile terminal is provided with a plurality of feed points, each feed point is connected with one switch, the each feed point is provided with one independent matching circuit, the mobile terminal controls the on-off switch of the switch through the CPU processor according to the concrete application demand and the environmental state of the mobile terminal so as to change the resonant frequency of the corresponding antenna, corresponding antenna accesses are selected through the radio frequency modules to achieve antenna multiplexing. On the premise without increasing the number of themobile terminal antennas, the mobile terminal antenna radiators can be more intelligently and reasonably utilized, and the frequency coverage and the receiving and transmission performances of the mobile terminal antennas are improved.