142results about How to "Bandwidth adjustable" patented technology

A method for hand-off of a CDMA access mobile from a macrocell to a femtocell is disclosed. The method includes tracking each femtocell which mobile stations have allowed access incorporating a mobile station identification for each of the mobile stations. The method continues with storing the mobile station identification for each femtocell. This may occur in a database or similar structure. The message continues on with requesting a hand-off from the macrocell to the femtocell via PN offset and the method concludes with querying all femtocells that have that PN offset that are within range of the macrocell's neighbor list. If only one femtocell fits that criteria the method is done. If more than one femtocell fits that criteria, a priority list may be set up based at least in part on the number of times and/or frequency that the mobile station has been allowed access on the femtocell. The method could include allocating resources for all high priority femtocells and cleaning up resources for the femtocells that do not send a hand-off complete message.

A method and system are provided for improving bandwidth efficiency in an optical network by dynamically utilizing unused bandwidth located around preliminarily allocated optical channels. The method comprising monitoring actual bandwidth of the preliminarily allocated optical channels incoming to a node of the optical network, reporting the monitoring results to the controller of that node and further to a network controller, receiving at that node recommendations generated by the network controller, adjusting bandwidth of one or more of the allocated optical channels thereby releasing spare bandwidth for inserting one or more additional optical channels thereat.

The invention provides a wavelength selection switch device, a communication device and a wavelength switching method. The wavelength selection switch device comprises an incident unit, an emergent unit, a wavelength dispersion and synthesis unit, a light control unit, a liquid crystal light beam deflection unit, a reflection unit and a deflection driving unit, wherein the incident unit comprises a plurality of incident light rays, the emergent unit comprises a plurality of emergent light rays, the wavelength dispersion and synthesis unit is used for dispersing and multiplexing each incident light ray on the first axial direction according to wavelengths, the light control unit is used for enabling different-wavelength light rays dispersed on the first axial direction not to be dispersed in the second axial direction, a plurality of pixels of the liquid crystal light beam deflection unit are divided into sub-areas corresponding to all the wavelengths, deflection is conducted on light rays with different wavelengths by changing phase-shift characteristics of the pixels of the sub-areas, the reflection unit is arranged parallel to the liquid crystal light beam deflection unit, the deflection driving unit drives the electrodes of the pixels of the sub-areas to generate needed phase-shift characteristics, and then light rays entering the sub-areas are deflected. According to the technical scheme, the number of ports of the wavelength selection switch device is greatly increased.

A method and a device for realizing dynamic adjustment of data bandwidth of the invention are disclosed. The method comprises adding a control channel in a PCM trunk link to describe occupancy condition of time slots for current services. The device comprises a control word process circuit, a time slot distribution circuit and a CPU interface circuit, wherein the control word process circuit is designed to complete abstraction and insertion of control information in a control channel of E1/T1 link, the time slot distribution circuit completes separating voice time slots from Ethernet data time slots and rebuilding the data, and the CPU interface circuit implements time slot distribution control. The method and the device can implement dynamic adjustment of Ethernet data bandwidth while ensuring voice services, to make effective use of trunk bandwidth and enhance user's data service bandwidth, and there is no error code and interruption of data service during bandwidth adjustment.

The invention discloses a miniaturized wideband power splitter circuit, which comprises a first port, a second port, a third port, a first impedance conversion unit, a second impedance conversion unit, a first isolation resistor, a second isolation resistor and a resonant unit, wherein after entering the circuit from the first port, signals are divided into two paths of signal links; one path passes through the first impedance conversion unit to reach the second port to be output; the other path passes through the second impedance conversion unit to reach the third port to be output; one end of the first isolation resistor is positioned between the first impedance conversion unit and the second port, and the other end of the first isolation resistor is connected with the second isolation resistor; and one end of the second isolation resistor is positioned between the second impedance conversion unit and the third port, and the other end of the second isolation resistor is connected with the first isolation resistor. The miniaturized wideband power splitter circuit has the beneficial effects that the simultaneous bandwidth broadening for the return loss and the isolation degree of each port can be realized; the defects of large circuit dimension, regulation difficulty of a circuit structure, poor performance and the like in the existing bandwidth broadening technology are overcome; and meanwhile, the advantages of wide bandwidth adjustable range, compact structure and the like are realized.

A clock data recovery system is provided for resampling a clock signal according to an incoming data signal stream. It comprises a clock generator for generating said clock signal wherein one of the frequency and phase of that clock signal is dependent upon a control signal. It is further provided a phase detector operable to detect the phase difference between said clock signal and said incoming data signal stream and is operable to generate a phase difference signal. A loop controller has a variable-gain and is operable to control said clock generator by generating said control signal. That control signal is dependent in said phase difference signal and that variable-gain. The variable-gain is dependent upon a transition rate of the incoming data signal stream. The loop controller can comprise a low-pass filter to generate from the phase difference signal a low-pass filered phase signal and to adjust the bandwidth of the clock data recovery system. The loop controller further can comprise a variable-gain element to amplify the filtered signal in accordance with a received bit transition rate provided by a bit transition detector and a density calculator.

The invention discloses a silicon-based multifunctional reconfigurable optical filter which comprises a first straight waveguide, a second straight waveguide and a plurality of micro-rings. The micro-rings are connected in parallel through the first straight waveguide and the second straight waveguide. Light field coupling happens between the micro-rings and the two straight waveguides, and no light field coupling happens between the micro-rings. The micro-rings are distributed at equal intervals. The optical filter composed of the micro-rings and the two straight waveguides comprises a plurality of resonant peaks. By controlling the distance of the micro-rings, the phases transmitted and introduced in the straight waveguides between every two adjacent micro-rings by the field with adjacent resonant peak wavelengths are odd times and even times of pi respectively, resonance of different strength is generated for the light field with the adjacent resonant peak wavelengths, and thereforethe optical filter has different filtering characteristics. The filtering functions with different filtering characteristics are achieved through the same filter structure, and it can be ensured thatthe central wavelength and bandwidth of the filter are adjustable.

A method to write information to two virtual tape servers. The method writes a file to a virtual host device disposed in a first virtual tape server, where the virtual host device comprises an adjustable bandwidth. The method queues a job to copy the file to a second virtual tape server, determines the age of the copy job, and copies that file to the second virtual tape server. The method sets an age threshold, and determines if the copy job age is greater than that age threshold. If the copy job age is greater than the age threshold, then the method decreases the adjustable bandwidth, if not, the method restores the adjustable bandwidth.

A method for expanding a data connection. A first user selection of a first profile is received from a plurality of profiles. The first profile selected by the user is implemented. A determination of a current time is made. Bandwidth available to the user is increased through a data connection in response to determining that the first profile allows for the bandwidth increase at the current time. A second user selection of a second profile is selected from the plurality of profiles. The second profile being implemented to adjust the bandwidth available to the user.

The invention discloses a multifunctional filter with adjustable center frequency and bandwidth based on a microstrip line resonator, comprising a first impedance resonator, a second impedance resonator, a third impedance resonator, a varactor diode D1, a varactor diode D2, a varactor diode D3, a varactor diode D4, a varactor diode D5, a varactor diode D6, a varactor diode D7, a varactor diode D8,a varactor diode D9, a varactor diode D10, a varactor diode D11, a varactor diode D12, a varactor diode D13, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R5,a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R10, a resistor R11, a capacitor C1, a capacitor C2 and a capacitor C3, wherein the distance between the first low impedance bandand the first low impedance band of the second impedance resonator is 2mm, and the distance between the first low impedance band of the second impedance resonator and the first low impedance band ofthe third impedance resonator is 1.2mm.

The invention relates to the field of optical communication devices and discloses a bandwidth-adjustable flat-top optical filter based on a DLP. The bandwidth-adjustable flat-top optical filter based on the DLP comprises input and output units, an optical grating, a lens combination and the DLP. Incident light is diffracted through the optical grating after being incident from the input ends of the input and output units, diffraction light beams are incident to the DLP after being collimated through the lens combination, after diffraction through the DLP, part of light beams are returned to the output ends of the input and output units after passing through the lens combination and the optical grating again, and the remaining light beams deviate from an original optical path and then are lost after being diffracted through the DLP. According to the structure, as the optical grating and the DLP are combined, flat-top pass band and bandwidth-adjustable filtering is achieved, bandwidth tuning precision is higher, the filter array that multiple filters share the same DLP can be achieved, and the bandwidth-adjustable flat-top optical filter is simple in structure and easy to obtain.

An amplifier (10) includes a first stage (4) including differentially coupled first (Q1) and second (Q2) input transistors and a controlled active load circuit (6). A second stage (8) includes differentially coupled third (Q5) and fourth (Q6) input transistors and a load circuit (Q7,8). A first output (2A) of the first stage (4) is coupled to a first input of the second stage (8), a second output (2B) of the first stage (4) being coupled to a second input of the second stage (8). A common mode feedback amplifier (12) has an input coupled to receive a common mode signal (3) from the second stage (8) for producing an amplified common mode signal (9) on a control input of the controlled active load circuit (6) to provide fast settling of an output (Vout) of the second stage without substantially increasing amplifier noise.

The invention relates to an electromagnetic wave multi-band filter with side micro-cavities and a metal-medium-metal waveguide coupled, and belongs to the technical field of filter design. According to the electromagnetic wave multi-band filter, the metal-medium-metal structure is used, the middle medium part is an insulating transparent layer and the waveguide is formed; multiple sets of side micro-cavities are manufactured in the metal parts and each set of side micro-cavities corresponds to a rectangular transmission stop band. Particularly, due to the fact that gold is very few in loss in the terahertz wave band, gold can be seen as an ideal electric conductor; the bandwidth of the filter can be adjusted by adjusting the width of the micro-cavities; multi-band filtering of the terahertz wave band can be realized. The electromagnetic wave multi-band filter has the advantages that the bandwidth and the number of the stop bands are adjustable; minimization and integration can be achieved conveniently; the electromagnetic wave multi-band filter can also be applied to other electromagnetic frequency bands such as the optical fiber communication frequency band and the microwave frequency band, and the requirements of different frequency bands can be met.

The invention discloses a tunable bandpass filter, which adopts a method of the combination of left-handed and right-handed non-linear transmission lines, wherein the left-handed non-linear transmission line consists of a series varactor and a shunt inductor, and has high-pass characteristic; and the right-handed non-linear transmission line consists of a series inductor and parallel varactor, and has low-pass characteristic. The capacitances of the varactors are changed by controlling the bias voltages of the varactors of the left-handed and right-handed non-linear transmission lines so as to adjust lower and upper side frequencies of the bandpass filter respectively.

The invention provides a terminal and a manufacturing method therefor. The terminal comprises an antenna and a conductive dielectric layer arranged in the terminal, wherein the conductive dielectric layer is connected with a grounding wire; and the conductive dielectric layer and a routing plane of the antenna are arranged in parallel and are isolated from each other with a set distance. According to the embodiments, the conductive dielectric layer is arranged in the terminal; the conductive dielectric layer and the routing plane of the antenna in the terminal are arranged in parallel and are isolated from each other with a set distance; a distributed capacitor can be formed between the conductive dielectric layer and the routing plane of the antenna; the antenna bandwidth can be adjusted by regulating the set distance; and the dielectric between the conductive dielectric layer and the routing plane of the antenna is air, so that loss on the terminal by the distributed capacitor can be neglected.

The invention relates to a bimodule-plane band-pass filter with a novel structure, which can be widely applied in the design of a radio-frequency microwave passive circuit. The filter consists of a capacitive load formed by microstrip lines with open circuit at the tail end and an annular bimodule resonant cavity; the annular bimodule resonant cavity is square and consists of an annular resonator (3) and a microstrip line load (4) with open circuit at the tail end at the right-angle position of the annular resonator (3); two input/output microstrip lines (1) are adopted and are both impedance converters (2) with quarter wavelength; the two input/output microstrip lines (1) are directly connected with two adjacent edges on the annular resonator (3), and the two adjacent edges have opposite angles with the microstrip line load (4) with open circuit at the tail end; and the whole filter structure is made on a medium substrate (5) with metal coated on both surfaces, wherein one surface is etched to be a circuit, and the metal on the other surface is totally reserved to be used as a ground plate. On the premise of maintaining the advantages of the original bimodule filter, the bimodule-plane band-pass filter reduces the insertion loss of the filter and has adjustable bandwidth.

A fiber laser having a ring resonance path comprises a pump light source, a Yb-doped optical fiber and a light modulation unit. The pump light source emits a pump light. The Yb-doped optical fiber is coupled with the pump light. The light modulation unit includes a grating pair, a diaphragm and two reflective elements. The grating pair is coupled with the pump light. The diaphragm includes an aperture. The light transmitted by the grating pair partially passes through the aperture and reaches one of the reflective elements to become a reflective light, and the reflective light passes through the aperture and is transmitted through the grating pair and the other reflective element to be coupled back with the ring resonance path.

The invention discloses a microstrip dual-passband coupling filter which comprises four feeder lines, two open branch lines and six microstrip lines, wherein six microstrip lines form a multi-mode dual-passband resonator for generating dual passband; the microstrip dual-passband coupling filter is of a bilaterally symmetrical structure; two sides of the multi-mode dual-passband resonator are respectively connected with one open branch line; the two open branch lines are respectively connected with the two feeder lines to form interdigital parallel coupled line structures; a connecting structure of the open branch lines and the multi-mode dual-passband resonator is a T-shaped structure; the two interdigital parallel coupled line structures are used as input and output respectively. The microstrip dual-passband coupling filter has high frequency selectivity and isolation, the two passbands can be adjusted independently, and the filter is simple in circuit structure and easy to process.

The invention discloses a memristor-based bandwidth adjustable low-pass filter circuit and an operation method thereof. The circuit is composed of a first-order active low-pass filter circuit including a memristor and a programming circuit including a memristor. The threshold voltage characteristics of the memristor are utilized, the working modes of the memristor are divided into an analog working mode and a programming working mode, and the bandwidth of the filter circuit is changed by changing the resistance value of the memristor. The programming circuit is composed of the memristor, four NMOS tubes and four PMOS tubes. The first-order active filter circuit is composed of the memristor, a capacitor and an operational amplifier. The invention also discloses a memristor-based bandwidth adjustable high-pass filter circuit and an operation method thereof. The circuit has the advantages that the active filter circuit is low in input impedance and high in output impedance, and the programming circuit has the advantages of being small in volume occupation, high in degree of integration, low in power consumption and easy to operate so that the circuit is suitable for signal filtering processing.

The disclosure claims a bandwidth adjustment method and system for Optical channel Data Unit flexible (ODUflex) based on a Generic Framing Procedure (GFP), wherein, the method includes that: (501) a source end sends a bandwidth adjustment control frame which contains bandwidth adjustment parameters; (503) a plurality of intermediate nodes forward the bandwidth adjustment control frame to a sink end via an ODUflex link, during the forwarding process, the plurality of intermediate nodes determine that resource thereof can satisfy the bandwidth adjustment parameters, and then reserve the bandwidth adjustment resource; (505) after receiving the bandwidth adjustment control frame, the sink end feeds back an adjustment acknowledgment frame which contains adjustment acknowledgment information to the source end via the plurality of intermediate nodes; (507) the plurality of intermediate nodes use the reserved bandwidth adjustment resource to implement adjustment for the bandwidth of the ODUflex link according to the adjustment acknowledgement information of the adjustment acknowledgment frame. The disclosure realizes the bandwidth adjustment for the ODUflex without interrupting an existing service by increasing an Optical channel Payload Unit (OPU) overhead for the bandwidth adjustment in the ODUflex (GFP) frame.

The invention provides a high isolation slot line duplexer applied to an ultra-wideband channel and a narrow-band channel. The high isolation slot line duplexer comprises a first filter and a second filter, wherein the first filter and the second filter share a dielectric substrate and has a slotted line structure and a microstrip line structure; the slotted line structure is positioned on the lower layer of the dielectric substrate, and the microstrip line structure is positioned on the upper layer of the dielectric substrate; the bandwidth of the first filter is controlled through coupling among a U-shaped slotted line resonator, a first open stub and a second open stub, and can be controlled by adjusting intervals g1 among the U-shaped slotted line resonator, the first open stub and the second open stub; and the mode of resonance of the second filter can be controlled by loading the length of the stubs, accordingly the bandwidth of the second filter can be adjusted by adjusting the size of l5. According to the high isolation slot line duplexer, the bandwidths of the two filters can be adjusted independently; and the high isolation slot line duplexer is compact in structure, simple in circuit and high in frequency selectivity.

The invention discloses an automatic service quality management method and apparatus for a storage array, and a computer readable storage medium. The method comprises the steps of obtaining target response time corresponding to data volumes accessed by servers, wherein the data volumes belong to an automatic hierarchy volume of the storage array; and according to current response time of the datavolumes and the corresponding target response time, performing corresponding bandwidth adjustment by utilizing an automatic service quality technology. By performing dynamic adjustment on the I/O bandwidth of the data volumes belonging to the automatic hierarchy volume, the service level is improved, and managers can set priorities based on performance requirements more easily; and through the automatic hierarchy volume, rarely accessed data can be migrated to a cheap general disk from an expensive high-performance disk, so that the fund input cost is reduced, a management mode of the managersis simplified, and the overall performance of the storage system is improved.

The invention discloses a radio frequency signal preselector. The frequency range of the radio frequency signal preselector is DC-4 GHz, the requirement of low waveband of an electromagnetic interference test receiver on the signal preselector is satisfied, and full-waveband signal preselection of the electromagnetic interference test receiver can be realized in combination with a high-waveband YIG (Yttrium Iron Garnet) signal preselector. The signal preselection technology of covering the low waveband of the electromagnetic interference test receiver is realized by a scheme of combining tunable filters, and the filter quantity is greatly reduced in comparison with that of a switch filter matrix comprising fixed filters, so that both the volume and the cost are greatly reduced. The filters are integrally embedded in the electromagnetic interference test receiver and are flexible and convenient to use. The tunable filters realize the signal preselection, the scanning central frequency of the electromagnetic interference test receiver and the central frequency of the preselector can be guaranteed to be the same, the filter bandwidths in the wavebands can be adjusted, and the signal preselection effect is better.