23 results about "Wideband" patented technology

A wideband receiver for a wireless communication system and a method for controlling the same are provided. In the wideband receiver for a wireless communication system, a receive path includes a mixer for receiving a Radio Frequency (RF) signal having a frequency f_SG and for converting the RF signal into an Intermediate Frequency (IF) signal having a frequency f_IF by mixing the RF signal with a first local oscillation signal having a first local oscillation frequency f_LO1, and at least one Phase Locked Loop (PLL) for providing the local oscillation signal to the mixer. A control block determines whether a half-IF signal having a center frequency of f_SG-f_IF/2 exists in the IF signal, and when the half-IF signal exists, controls the at least one PLL to generate a second local oscillation signal having a second local oscillation frequency f_LO2 greater than the first local oscillation frequency f_LO1.

The invention discloses an ultrasound thickness measuring method and a device based on broadband frequency-modulation and receiving compensation. Thee method structures an intermittent type broadband linear frequency-modulation ultrasound signal by using the method of linear frequency-modulation; broadcasting time of the intermittent type broadband linear frequency-modulation ultrasound signal at the inner part of a workpiece is inverted according to frequency parameters of emitted and received frequency-modulation signals; workpiece thickness is obtained by combining a preset sound speed. The device comprises a handhold type control, a display and an array type ultrasound wave probe component, wherein the array type ultrasound wave probe component is composed of a plurality of ultrasound transducers capable of stimulating the broadband linear frequency-modulation ultrasound wave, wherein one ultrasound transducer is arranged in the middle, and the rest ultrasound transducers are arranged at four sides. The ultrasound thickness measuring method and the device can realize the flaw detection at a near field and a remote field; and the invention is low in energy loss, small in volume, high in precision and strong in antijamming capability; and furthermore, the ultrasound thickness measuring method and the device can adapt various noise environments.

A waveguide slotted array antenna comprises a feed layer and a radiation layer, wherein the feed layer is located below the radiation layer, and the radiation layer comprises a first radiation unit, a second radiation unit, a third radiation unit and a fourth radiation unit which are stacked from bottom to top; the first radiation unit comprises a first flat metal plate and a first radiation array arranged on the first flat metal plate, the second radiation unit comprises a second flat metal plate and a second radiation array arranged on the second flat metal plate, the third radiation unit comprises a third flat metal plate and a third radiation array arranged on the third flat metal plate, and the fourth radiation unit comprises a fourth flat metal plate and a fourth radiation array arranged on the fourth flat metal plate. The waveguide slotted array antenna has the advantages of low sidelobes and low cost while ensuring broad bands and high gains, and can be made small.

The invention discloses a doped fiber bragg grating-based optical fiber flow sensor which comprises a temperature compensation section optical fiber and a flow measurement section optical fiber, wherein the flow measurement section optical fiber is a doped optical fiber, a fiber bragg grating A is written in a fiber core of the flow measurement section optical fiber, the temperature compensation section optical fiber is a common single-mode optical fiber, and a fiber bragg grating B is written in a fiber core of the temperature compensation section optical fiber. The flow measurement section optical fiber is pumped by using a pumping laser, the temperature of the flow measurement section optical fiber and the wavelength of the fiber bragg grating A change with the wind speed, the flow measurement section optical fiber can be used as a broadband light source, and thus the structure of the sensor is simplified. By combining a fiber bragg grating technology and a hot line type flow sensing technology, the doped fiber bragg grating-based optical fiber flow sensor realizes synchronous measurement of temperature and flow, and has the advantages of simplicity in manufacture, small size, high sensitivity, lower cost and the like.

The present invention relates to a method for defining, in a TDD wireless communication system in which broadband is configured by means of carrier aggregation, transceiving timing for a data channel and a control channel when cross-carrier scheduling is implemented.

Ultra wideband patient monitoring systems, and particularly baby monitoring systems, adapted to prevent reflective loss between the antenna and the patient's body. The devices, systems and methods described herein may be used to efficiently couple UWB energy to a patient for patient monitoring. In particular, described herein are impedance transformer pads, mats and the like, upon which a patient may comfortably lie while being monitored via one or more UWB sensors (e.g., antenna); the impedance transformer pads help match the impedance and prevent reflective loss of UWB energy. Also described herein are bassinets, including NICU bassinets and baby monitors.

The invention discloses a full-spectrum detector for rapidly detecting foods and a detection method of the detector. According to the full-spectrum detector, the output end of an ARM (Advanced RISC Machines) embedded type system is connected with a power stabilizing circuit, a broadband light source and an illumination optical fiber in sequence, wherein incident light transmitted by the broadband light source is irradiated to a solution to be tested in a sample tank through the illumination optical fiber and is partially absorbed by the solution to be tested to obtain emergent light; the emergent light is led into a full-spectrum light-splitting light path by a measurement optical fiber to be subjected to light splitting and then is irradiated to a CCD (Charge Coupled Device) detector; the CCD detector is used for detecting the light-split emergent light and sending detection data to a signal acquisition circuit; the signal acquisition circuit is used for processing measurement data to obtain full-spectrum information and sending the full-spectrum information to the ARM embedded type system; the ARM embedded type system is further connected with a data storage chip and a display module. The full-spectrum detector is small in volume, compact in structure and convenient to carry, can be used for measuring accurately and can be widely applied to field detection on the foods.

Improved lumped Raman amplification systems are disclosed. A lumped Raman amplification structure provides optimized efficiency, low noise figure over a range of gain settings, and a high saturation threshold. Responsibility for amplifying different portions of the spectrum is divided among multiple stages. In one particular implementation, two outer stages amplify a first band and two inner stages amplify a second band. The two inner stages also apply a small amount of amplification to the first band. A modification improves noise figure in the second band by adding some amplification in the second band to the first stage.

The invention relates to a digital tuner solving the problem that the power levels of television signals are lowered because of a great number of combined two-order and three-order beat interference signals generated by dense channel signals of the prior high-level cable digital televisions. The digital tuner comprises an antenna input device, a radio-frequency AGC low-noise wideband pre-amplifier, a power divider, a frequency selective network, a tracking filter, a frequency mixer, a local oscillator, an intermediate-frequency filter, a circular signal output device, a rheostatic diode, an alternating current gain controller and a delay controller, wherein the alternating current gain controller is connected in series with the frequency selective network and the tracking filter and also connected in parallel with the delay controller and a high-frequency AGC voltage. The invention adopts a step-by-step AGC control mode to control intermediate-frequency AGC, high-level AGC and radio-frequency AGC step by step so that the functions that a small signal receives a low noise factor and a large signal has a large receiving dynamic range is achieved, and the acceptable maximum cable television signal level can not be lowered.

A high-g shock accelerometer is provided with an LCC case. A MEMs acceleration sensor is positioned in an interior of the LCC case. The MEMs acceleration sensor has exterior surfaces including top and bottom surfaces and side surfaces. An elastomer is in an adjacent relationship or in contact to a majority of the exterior surfaces and to the interior of the LCC case. The MEMs acceleration sensor with the elastomer attenuates LCC case strain sensitivity while retaining wide band frequency response.

The invention discloses a generation device and method for a wide-range reconfigurable UWB (Ultra-Wideband) based on cascaded DE-MZMs (Dual-Electrode Mach-Zehnder Modulators), belongs to the technical field of the ultra-wide band and aims at generating any first-order to fifth-order UWB signals and realizing adjustable pulse polarity, under the condition of not changing a system structure. The device comprises a laser, an optical coupler, a first-level DE-MZM, a second-level DE-MZM, a Gaussian pulse signal generator, a first photoelectric detector, a second photoelectric detector and an amplifier. The laser is connected with the optical coupler. According to the method, the continuous light generated by the laser passes through the optical coupler and then is divided into two ways; Gaussian pulse signals are attenuated and delayed and then are respectively input into two arms of the first-level DE-MZM; the signals at two arms of the first-level DE-MZM are converted into electric pulses by the first photoelectric detector; the signals are amplified, attenuated and delayed by the amplifier and then are input into the two arms of the second-level DE-MZM for secondary modulation; and after the modulation, the signals are output.

The invention embodiment provides a scheduling method comprising the steps of: arranging a first crossing matrix between a first business access unit and a crossing unit; arranging a second crossing matrix between the crossing unit and a second business access unit; configuring line crossing relation for the first crossing matrix according to a maximum usage quantity and real usage quantity of the crossing unit and real business access quantity of the first business access unit; and configuring a line crossing relation of the second crossing matrix according to the line crossing relation of the first crossing matrix, so the line crossing relation of the second crossing matrix is symmetrical to the line crossing relation of the first crossing matrix. The invention embodiment also provides a scheduling apparatus and system; the method, apparatus and system can improve utilization rate of crossing wideband, save line resources of crossing unit, and reduce power consumption and cost of the scheduling.

The invention belongs to the field of mechanical vibration control, and aims to provide an insect-imitating low-frequency vibration isolation structure. According to the structure, the bearing capacity and rigidity of the vibration isolator can be adjusted, and broadband and low-frequency vibration isolation can be achieved through nonlinear rigidity and damping. According to the technical scheme, the insect-imitating low-frequency vibration isolation structure is characterized in that the low-frequency vibration isolation structure comprises an upper base plate and a lower base plate which achieve relative movement in the vertical direction through a vertical direction guide structure, a serial rhombic structure arranged between the upper base plate and the lower base plate and used for applying a restoring force, and a horizontal direction guide structure connected to the serial rhombic structure in series so as to increase the non-linear inertia force and the non-linear damping force to the upper base plate and the lower base plate.