35results about How to "Improve signal reception sensitivity" patented technology

A wireless power transmitting device for a wireless power communication system. The wireless power transmitting device includes: a circuit board including an insulating layer and a ground formed on the insulating layer; a core of a magnetic substance disposed on the circuit board to have a concave portion; a wire-wound coil accommodated in the concave portion to have one end for receiving a power through the circuit board and the other end connected to the ground; and a metal layer disposed between the core and the insulating layer to be connected to the ground.

Disclosed is a bandpass filter comprising a first resonator 1 to a sixth resonator 6 having lengths of basically ¼ wavelength, an input section IN connected to an ungrounded end of the first resonator, and an output section OUT connected to an ungrounded end of the sixth resonator, wherein the second to fifth resonators 2-5 are electromagnetically coupled with each other, the second and the third resonators are respectively coupled to the first resonator via the first and the second capacitances C1,C2, the third and the fourth resonators are respectively coupled to the sixth resonator via the third and the fourth capacitances C3,C4, and the input section IN and output section OUT are coupled to the first resonator and sixth resonator through an input and output capacitances C5, C6, respectively. This bandpass filter can be a small size, low loss filter suitable for UWB (Ultra Wide Band).

According to a WDM optical transmission system of the present invention, wavelength numbers information of a WDM signal light output from an upstream side optical amplifying unit to a transmission path fiber, and signal output level information thereof are transmitted to a downstream side optical amplifying unit utilizing a supervisory control light. In the downstream side optical amplifying unit, a loss (span loss) in the transmission path fiber is computed using the upstream side signal output level information and downstream side signal input level information, so that a gain to be set for a downstream side optical amplifier is calculated based on the computed loss, and also, the gain is corrected based on a difference between a target value of the signal output level computed using the wavelength numbers information and an actual measurement value thereof, so that the optical amplifier is controlled in accordance with the post-corrected gain. As a result, it becomes possible to reduce an influence by a measurement error of the span loss, to thereby control the optical amplifier at a high-speed and with high precision.

The invention discloses a sensor for sending and receiving the encoded information based on magnetic field induction. The sensor includes at least one magnetic field generator for the sending of the encoded information based on magnetic field induction, at least one magnetic field induction apparatus independent from the magnetic field generator for the receiving of the encoded information based on magnetic field induction. By the design, the magnetic field sensor can respectively optimize the magnetic field generator and the magnetic field induction apparatus to achieve optimum sending and receiving. The invention also discloses an electronic product which has a memorizer, wherein the electronic product is provided with the magnetic induction communication sensor of the invention which can send and receive information through magnetic field between users.

According to a WDM optical transmission system of the present invention, wavelength numbers information of a WDM signal light output from an upstream side optical amplifying unit to a transmission path fiber, and signal output level information thereof are transmitted to a downstream side optical amplifying unit utilizing a supervisory control light. In the downstream side optical amplifying unit, a loss (span loss) in the transmission path fiber is computed using the upstream side signal output level information and downstream side signal input level information, so that a gain to be set for a downstream side optical amplifier is calculated based on the computed loss, and also, the gain is corrected based on a difference between a target value of the signal output level computed using the wavelength numbers information and an actual measurement value thereof, so that the optical amplifier is controlled in accordance with the post-corrected gain. As a result, it becomes possible to reduce an influence by a measurement error of the span loss, to thereby control the optical amplifier at a high-speed and with high precision.

The invention relates to the field of communication and especially relates to a signal processing method and apparatus under a GSM system, for solving the problems of low signal receiving sensitivity of a user terminal under the GSM system and low communication capability and poor conversation quality in a weak signal environment in the prior art. The method is as follows: in the process when the user terminal receives signals under the GSM system, when the user terminal determines that the signal intensity of first signals received through a main set antenna does not exceed a set threshold, a diversity antenna switch is switched off, the user terminal receives second signals on a preset frequency range where the first signals are received through a diversity switch, the user terminal merges the first signals with the second signals, and complete signals are obtained. In such a way, the signal receiving intensity of the user terminal under the GSM system is effectively improved, the communication capability and the conversation quality of the user terminal in the weak signal environment are enhanced, and at the same time, the utilization rate of components is also improved.

First and second signal processing units are each configured by an IC, so that the circuit space occupying in a receiver apparatus can be reduced. The signal path can be shortened from a BPF section inputting a program signal coming from a broadcasting station to a demodulation section compared with the related art. The transmission loss on the signal path can be thus reduced compared with the related art. The possible route for noise entering from the outside to the first and second signal processing units can be made as short as possible. This enables to reduce the noise entering from the outside, and prevents the signals coming over the signal path from being attenuated by the noise so that the signal reception sensitivity can be increased.

The invention discloses an ultrashort wave folding type discone antenna which comprises a telescopic component, a core rod, a top control disk, a sliding shaft, a flange casing, a main supporting pipe, a vertical-polarization conductor casing, a lower connecting disk, an upper connecting disk, eight horizontal-polarization long oscillators, eight horizontal-polarization short oscillators, eight oblique-polarization antenna vibrators and a signal processing circuit module. Under the mode that the operating frequency range of ultrashort waves is met, the range of operating frequency range of the antenna is expanded furthest to 20-3600MHz, and the signal receiving sensitivity is improved. The structure size of the antenna is reduced furthest, the weight is decreased, the size is reduced, and the force distribution of the whole cylindrical antenna structure is improved.

The invention discloses a transmission system and method for transmitting wide frequency band simulating radio frequency signals through optical transmission media. The transmission system comprises an antenna, indoor receiving equipment, a light emission box located at an antenna end, a light receiving box at a receiving equipment side and the optical transmission media connected with the light emission box and the light receiving box, wherein radio frequency signals output by the antenna are transmitted to the light emission box through a cable, the light emission box converts the radio frequency signals into light signals and then transmits the light signals to the light receiving box through the optical transmission media, the light receiving box recovers the light signals to the radio frequency signals and then transmits the radio frequency signals to the indoor receiving equipment through a cable, and the indoor receiving equipment analyzes and processes the radio frequency signals. The radio frequency signals are converted into the simulating light signals for signal transmission, the transmission system is large in transmission bandwidth, large in capacity, small in chromatic dispersion and free of electromagnetic interference, loss of the signals on the transmission line is largely reduced, the signal quality, safety and reliability of the system are improved, and the construction cost is reduced.

The invention provides a radio frequency system enhancing 2G / 3G sensitivity. The system comprises a radio frequency transceiver main module which is used for transmitting and receiving radio frequency signals, a main receiving module which is used for sending signals received by a main antenna to the radio frequency transceiver main module, and a diversity receiving module which is used for sending signals received by a diversity antenna to the radio frequency transceiver main module, wherein the main receiving module is connected with the radio frequency transceiver main module, and the diversity receiving module is also connected with the radio frequency transceiver main module. By switching a main antenna mode to a main and diversity antenna multiplex mode, an RX path is switched from a single channel to double channels, and the 2G / 3G signal receiving sensitivity is enhanced.

An optical coherence tomographic device configured to acquire a tomographic image of a subjected eye is disclosed herein. The optical coherence tomographic device may include a light source of wavelength sweeping type; and a measurement optical system configured to irradiate the subjected eye with light outputted from the light source, where D / S×λ>1.61 may be satisfied, with a diameter of the light outputted from the light source at an incident position to the subjected eye is D, a wavelength swept frequency of the light source is S, and a center wavelength of the light outputted from the light source is λ.

The invention discloses mobile communication active antennas and a distributed antenna system with the same, and mainly solves the problems as follows: in the prior art, power loss is more because most conventional DASs (Distributed Antenna Systems) adopt passive antennas; the application effects of passive antennas decline with the increase of the coverage; passive antennas are difficult to popularize and apply. Each mobile communication active antenna comprises a first duplexer, a downlink amplifying module, a downlink filtering module, a downlink power amplifying module, a second duplexer, an uplink low-noise amplifying module, an uplink filtering module and an uplink power amplifying module which are connected clockwise into a cyclic structure. Through the adoption of the scheme, the purposes that the power consumption is lower and the coverage is wider are achieved. Therefore, the mobile communication active antennas have high utility values and popularization values.

A self-coherent signal transceiving method and a device relate to the field of short-distance optical transmission, and the method comprises the steps: generating an IQ signal for IQ modulation, and outputting an IQ modulation optical signal; meanwhile, generating two paths of clock signals for IQ modulation, and outputting a light guide frequency signal, so that the intensity of the light guide frequency signal is greater than that of the IQ modulation optical signal; and synthesizing the IQ modulation optical signal and the light guide frequency signal into a self-coherent optical signal andsending out the self-coherent optical signal; receiving and sampling a self-coherent optical signal; taking a square root to obtain an optical signal amplitude A (n); performing up-sampling to obtainan optical signal amplitude A '(m); taking a natural logarithm of an up-sampling signal and then carrying out Hilbert transform; extracting a phase and outputting the signal, performing digital down-conversion for obtaining a baseband signal, then performing down-sampling for obtaining a baseband signal, and finally performing dispersion compensation and signal recovering on the baseband signal.According to the method and the device, through IQ modulation and direct detection, the complexity of the system is reduced, and the signal receiving sensitivity is improved.

The invention discloses a wireless sensor testing system and method. According to the system, a signal line control module is utilized to establish a dual-polarized antenna and communication antenna signal link from a wireless gateway, signal source equipment, a frequency spectrograph, a comprehensive tester and a network analyzer to a microwave anechoic chamber, so the wireless communication witha tested wireless sensor in the microwave darkroom is established through the dual-polarized antenna and the communication antenna; meanwhile, by means of control of the measurement and control host,the wireless communication between different analysis and test devices and the tested wireless sensor is achieved through the dual-polarized antenna and the communication antenna, so integration of test schemes of various types of existing wireless sensor devices is achieved, and the whole system and method are high in compatibility and high in automation degree. In the method provided by the invention, the precision of the measured signal receiving sensitivity of the wireless sensor is higher by utilizing six gradually reduced adjustment stepping values.

An electronic timepiece includes a planar antenna that receives a circularly polarized wave and a controller that activates the planar antenna. The planar antenna includes an antenna electrode having a degeneracy separator and a power feeder. The power feeder is disposed within a first angular range or a second angular range with respect to the center of the planar antenna. The first angular range is an angular range from a 1.5-o'clock direction to a 4.5-o'clock direction and the second angular range is an angular range from a 7.5-o'clock direction to a 10.5-o'clock direction.

The invention provides a signal switching device and an electronic device. The signal switching device comprises a connector assembly and a shielding assembly. The connector assembly comprises a patchconnector male seat and a patch connector female seat, the patch connector male seat is arranged on a first substrate, the patch connector female seat is arranged on a second substrate, and the patchconnector male seat and the patch connector female seat are pluggably connected for realizing signal transmission between the first substrate and the second substrate. The shielding assembly comprises a shielding cover made of a metal material, and the shielding cover is connected with the first substrate and the second substrate to form shielding space for accommodating the connector assembly inthe shielding space. Through arranging the shielding assembly to form the sealed shielding space, the connector assembly is accommodated in the shielding space, electromagnetic shielding of high-speed signals is realized, interference to other signals on the board is avoided, the signals are ensured not to be leaked, the wireless module signal receiving sensitivity in the same system can be enhanced, the shielding structure is simplified, and the material cost is reduced.

The invention discloses a three-in-one tuner with the compatibility of DVB-T / C and ATV, comprising an input selection module, a selection control circuit, a radio-frequency gain adjustment module, a down-conversion module and a decoding demodulation module, wherein, the input selection module is used for selecting two groups of input signals of a ground signal and a wired signal; the selection control circuit is used for controlling the input selection module to carry out input selection on a radio-frequency signal; the radio-frequency gain adjustment module is used for controlling the gain of the radio-frequency signal; the down-conversion module is used for converting the received radio-frequency signal into an intermediate-frequency signal suitable for the decoding demodulation module; and the decoding demodulation module is used for decoding and demodulating the intermediate-frequency signal after being amplified. In the invention, two signal lines are connected to the two input ends of a high-frequency head, which one of the ground signal and the wired signal is input to a lower-level circuit by the input selection module, the invention has simple circuit formation structure, realizes the compatibility of the DVB-T / C and the ATV and has good performance and high sensitivity; and compared with the prior art, the invention has more convenient debugging and use.

A wireless modem and noise cancellation method for the same for noise cancellation effectively cancels a noise signal induced from a device to which the wireless modem is connected. A primary antenna receives a radio signal that includes a first noise signal coming from a device to which the wireless modem is connected; a secondary antenna receives a second noise signal from the connected device; a noise signal adjuster for adjusting the second noise signal received by the secondary antenna using a correlation parameter between noise signals received by the primary antenna and the secondary antenna; and a noise remover subtracts the noise signal adjusted by the noise signal adjuster from the radio signal received by the primary antenna.

A system includes; a first power line connectable with a first fuse and feeds electric power from a battery to a controller; a second power line connectable with a second fuse and feeds electric power from the battery to the controller; a first detector that detects whether the first fuse is connected; a second detector that detects whether the second fuse is connected; and the controller that causes specific equipment to operate upon detection of receipt of a signal by a receiver that operates intermittently to receive signals from a mobile terminal. The controller sets a cycle of operation of the receiver to a first cycle when the first fuse is connected, and set the cycle of operation of the receiver to a second cycle longer than the first cycle, when it is detected that the first fuse is not connected, and the second fuse is connected.

The invention discloses a wide-frequency-range, high-sensitivity, spurious-free and large-dynamic-range light emitting case and a light emitting method thereof. The wide-frequency-range, high-sensitivity, spurious-free and large-dynamic-range light emitting case comprises a radio frequency selecting switch, a radio frequency processing unit, a filter bank and an optical modulator. The input of the radio frequency selecting switch is connected with radio frequency input signals, and the output of the radio frequency selecting switch is connected with the input of the radio frequency preprocessing unit; the output of the radio frequency preprocessing unit is connected with the input of the filter bank; the output of the filter bank is connected with the input of the optical modulator; the radio frequency selecting switch selects one of multiple paths of radio frequency signals as the input, the radio frequency preprocessing unit preprocesses the input radio frequency signals, the filter bank filters out the interference signals of the preprocessed radio frequency signals, the optical modulator converts the radio frequency electric signals into optical signals, and the optical signals output by the optical modulator is connected with optical transmission medium. The wide-frequency-range, high-sensitivity, spurious-free and large-dynamic-range light emitting case is low in signal transmission loss, high in signal receiving sensitivity, large in transmission signal dynamic range, free from frequency deviation during the optical modulation process and capable of avoiding interference signals.

The invention discloses a convenient-to-deploy remote security and protection early-warning linkage system. The system comprises a plurality of induction front-end devices, a plurality of relay devices and a plurality of receiving-end devices; the induction front-end devices are in communication with the relay devices through a LoRa encryption protocol; a LoRa star topology network is established among the relay devices; the receiving-end devices are connected to the LoRa star topology network; the receiving-end devices are connected with a mobile phone APP through Bluetooth; and the relay devices and the receiving-end devices are subjected to working mode switching through a physical key or a key of the mobile phone APP. A traditional network architecture is abandoned; a LoRa star topology networking technology is adopted; a 433 Mhz wireless transmission frequency is achieved; a communication distance of more than or equal to 3 Km (sight distance) can be realized; and the system can be rapidly deployed in large-range places such as factories, parks and the like. Compared with high cost of deploying a network environment in large-range places by a traditional network-based security and protection early-warning system, the cost of a networking mode is low.

An optical coherence tomographic device configured to acquire a tomographic image of a subjected eye is disclosed herein. The optical coherence tomographic device may include a light source of wavelength sweeping type; and a measurement optical system configured to irradiate the subjected eye with light outputted from the light source, where D / S×λ>1.61 may be satisfied, with a diameter of the light outputted from the light source at an incident position to the subjected eye is D, a wavelength swept frequency of the light source is S, and a center wavelength of the light outputted from the light source is λ.

The invention discloses a three-in-one tuner with the compatibility of DVB-T / C and ATV, comprising an input selection module, a selection control circuit, a radio-frequency gain adjustment module, a down-conversion module and a decoding demodulation module, wherein, the input selection module is used for selecting two groups of input signals of a ground signal and a wired signal; the selection control circuit is used for controlling the input selection module to carry out input selection on a radio-frequency signal; the radio-frequency gain adjustment module is used for controlling the gain of the radio-frequency signal; the down-conversion module is used for converting the received radio-frequency signal into an intermediate-frequency signal suitable for the decoding demodulation module;and the decoding demodulation module is used for decoding and demodulating the intermediate-frequency signal after being amplified. In the invention, two signal lines are connected to the two input ends of a high-frequency head, which one of the ground signal and the wired signal is input to a lower-level circuit by the input selection module, the invention has simple circuit formation structure,realizes the compatibility of the DVB-T / C and the ATV and has good performance and high sensitivity; and compared with the prior art, the invention has more convenient debugging and use.

The invention provides a CCSK-RS cascade code error code element deleting method. The method for deleting the error code element of the RS cascade code comprises the following steps of: calculating acorrelation peak ratio of each signal-to-noise ratio simulation point, and not deleting the code element when the correlation peak ratio is less than a threshold; otherwise, deleting the code elementduring RS decoding, taking the average value of the optimal threshold values of the signal-to-noise ratio simulation points as the optimal threshold value corresponding to the RS codes, calculating aCCSK correlation peak ratio R after receiving signals, and not deleting the code element during RS decoding; otherwise, deleting the code element during RS decoding, and performing error correction decoding. According to the invention, decoding is carried out under the influence of noise; code elements causing detection errors due to noise can be detected and deleted according to the correlation peak ratio; therefore, the correct probability of RS decoding is effectively improved, the signal receiving sensitivity of a receiver is improved, code elements subjected to strong interference can beeffectively detected and deleted under the condition of strong interference influence, the interference influence is eliminated, and the anti-interference capability of the system is improved.

A television receiving apparatus 100 includes a television receiver 20, and a smart antenna 10 having directivity capable of being electrically changed so as to match radio waves to be received. A handle 50 is provided with a mechanism holding the smart antenna 10 therein, fixed to the television receiver 20 and capable of changing the distance between the smart antenna 10 and the television receiver 20 as an antenna holding box. The antenna having directivity capable of being electrically changed so as to match with radio waves to be received is disposed so that the aesthetic appearance can be improved and the signal receiving sensitivity of the antenna can be enhanced.

First and second signal processing units are each configured by an IC, so that the circuit space occupying in a receiver apparatus can be reduced. The signal path can be shortened from a BPF section inputting a program signal coming from a broadcasting station to a demodulation section compared with the related art. The transmission loss on the signal path can be thus reduced compared with the related art. The possible route for noise entering from the outside to the first and second signal processing units can be made as short as possible. This enables to reduce the noise entering from the outside, and prevents the signals coming over the signal path from being attenuated by the noise so that the signal reception sensitivity can be increased.

Disclosed is a bandpass filter comprising a first resonator 1 to a sixth resonator 6 having lengths of basically ¼ wavelength, an input section IN connected to an ungrounded end of the first resonator, and an output section OUT connected to an ungrounded end of the sixth resonator, wherein the second to fifth resonators 2-5 are electromagnetically coupled with each other, the second and the third resonators are respectively coupled to the first resonator via the first and the second capacitances C1,C2, the third and the fourth resonators are respectively coupled to the sixth resonator via the third and the fourth capacitances C3,C4, and the input section IN and output section OUT are coupled to the first resonator and sixth resonator through an input and output capacitances C5, C6, respectively. This bandpass filter can be a small size, low loss filter suitable for UWB (Ultra Wide Band).