789results about How to "Improve transmission distance" patented technology

The invention discloses a transmission device. The transmission device includes an interface circuit, a data converting circuit, at least a physical layer and a transmission medium. The interface circuit is used to receive a PCIe signal or a PCI signal. The data converting circuit is coupled to the interface circuit and used to convert the PCIe signal or the PCI signal into at least a data packet. The physical layer is coupled to the data converting circuit and used to process and transfer the data packet. The transmission medium receives and transfers the data packet.

An electrode is formed on at least one surface of first and second surfaces of a dielectric film formed of resin to be capable of receiving or transmitting an electromagnetic wave in a terahertz band. A semiconductor device operable in the terahertz band is mounted on at least one surface of the first and second surfaces of the dielectric film to be electrically connected to the electrode. A portion of a support layer is formed on the first or second surface of the dielectric film, and a dielectric lens is supported by another portion of the support layer. Another portion of the support layer is bent with respect to the portion such that the electromagnetic wave in the terahertz band transmitted or received by the electrode permeates through the dielectric lens.

The present invention relates to a method for optical fiber transmission which can increase a transmission distance. A first optical fiber having dispersion is first provided. An optical signal is next supplied to the first optical fiber so that the optical signal is compressed on the time axis as propagating in the first optical fiber. In the case that the dispersion is normal dispersion, for example, prechirping is performed so that the optical signal has down-chirp. A compressed optical signal output from the first optical fiber is supplied to an optical device having a saturated gain. According to this method, the transmission distance can be increased by the effective combination of compression of the optical signal and waveform shaping by the optical device.

The present invention provides a method and system for establishing a highly mobile, long range secure wireless network with dynamic topologies and near full connectivity with acceptable latency using low cost, low power, compact and lightweight devices. One aspect of the system deals with a highly mobile network with dynamic network topologies and a time varying wireless medium that has neither absolute nor readily observable boundaries outside of which radio nodes are known to be unable to receive network frames, although the desirable open field boundary is 1 mile in radius from a base station node. A synchronous frequency hopping technique is used with mobile nodes that can become slave base station nodes to a master base station node to increase the effective range of the master base station without increasing the transmit power. Furthermore, the use of adjustable sleep times for the mobile nodes, as well as a novel clock calibration method, provides a substantial range increase with acceptable battery size and system latency.

A portable electronic device capable of expanding transmission distance of NFC is provided. The portable electronic device includes a watch-strap portion, a power module, an NFC module, and a relay coil group arranged in the watch-strap portion. The power module includes a wireless charging coil, and the NFC module includes an NFC antenna. The relay coil group is configured to relay external electromagnetic power from an external power source to the power module by the coil group being magnetically coupled with the wireless charging coil. The relay coil group is also configured to relay NFC information between the NFC module and an external NFC read-write device or an external NFC storing device by the coil group being magnetically coupled with the NFC antenna. Therefore, the distances for both charging and NFC functions are expanded.

The present invention provides an optical switching apparatus and method of an eNB. The above apparatus includes: a fiber transceiver module (102), configured to receive an optical signal which carries transmission address information from the source input end (101) and transmit the optical signal; a transmission address module (103), configured to receive the above optical signal, query routing, and manage and maintain transmission address(s); a switching control module (104), configured to obtain the transmission address information of the optical signal, analyze and select an optical switching mode, and transmit a routing control signal which carries the transmission address information and the optical switching mode; and an optical switching and routing module (105), configured to receive the above optical signal and transmit the same to a destination output end (106) by the fiber transceiver module (102), receive the routing control signal of the switching control module (104), select a routing and transmit the optical signal to the destination output end (106). According to the present invention, the RRU and the BBU of the eNB can communicate with devices of the BBU and the RRU of the different manufacturers, can be applied to the multi-mode base station, and can adapt to the different mode; therefore the transmission distance is enlarged.

A wireless temperature measuring system, including multiple wireless temperature sensors, and multiple communication terminals; the wireless temperature sensors communicate with the communication terminals via RF, the wireless temperature sensor operates to obtain temperature signals from a temperature detection point, to perform cyclic-interleave and error-correction coding on the temperature signals whereby obtaining coded temperature signals, and to transmit the coded temperature signals to the communication terminals via RF; the communication terminal operates to receive and decode the coded temperature signals from the wireless temperature sensor, and to obtain decoded temperature signals.

A magnetic coupling resonant wireless energy transmission device provided with an intensifier relates to the field of wireless energy transmission, and aims at intensifying the transmission distance of existing magnetic coupling resonant wireless energy transmission technology. The invented transmission device consists of an intensified emission source and an energy receiver; the two electromagnetic systems with the same specific resonant frequency are used for energy transmission owing to the resonance caused by the same vibration frequency, when the two systems are separated from a certain distance. An intensifier is added in the intensified emission source, strong magnetic coupling is produced between the intensifier and a resonant emission circuit, the intensifier has the functions of reducing impedance, modifying transmitted waveforms, intensifying resonant current, emitting modified alternating magnetic fields outwards, resonance ia produced between the intensifier and the energy receiver. Owing to the adding of the intensifier, the energy transmission distance of the technology is intensified greatly, is about five times longer than the former and is probably even longer.

The phase sensitive amplifier according to the present invention is a phase sensitive amplifier that uses the optical mixing using a nonlinear optical effect to amplify the signal light. The phase sensitive amplifier according to the present invention includes: the first second-order nonlinear optical element; and the second second-order nonlinear optical element. The first second-order nonlinear optical element causes the fundamental wave light to generate second harmonic light used as pump light and separates only the second harmonic light. The second second-order nonlinear optical element includes a multiplexer to multiplex the signal light with the second harmonic light and spectrally separates only the amplified signal light. The multiplexed signal light and second harmonic light are used subjected to parametric amplification.

The present invention relates to a wavelength-division multiplexed passive optical network. In particular, it relates to a technology for minimizing the optical loss at a wavelength-division multiplexed passive optical network based on wavelength-locked light source Thereby it improves the transmission quality and increases the transmission distance.A 4-port optical path setting device of the present invention increases the amount of light injected into an optical transmitter and thereby improves the wavelength-locking characteristic of a light source. In addition, it can decrease the optical transmission loss in an optical transmission path, and by an optical amplifier being inserted therein; it can also compensate the optical loss in an optical transmission path.In the present invention, a 4-port optical path setting device having the characteristics described above and a method for fault recovery without an additional optical loss are presented.

The present invention relates to a wireless laser communication PPM polarization modulation- demodulation method, which creates one-to-one correspondence between a PPM signal of an information source and an elliptic polarizing angle. Based on the correspondence, the signal of the information source is modulated into an elliptic polarized light with a corresponding elliptic polarizing angle and emits the light in the form of an optical signal. During demodulation, the polarizing angle of the received elliptic polarized light is calculated to confirm information of the information source corresponding to the polarizing angle according to the correspondence above and then complete information demodulation. The modulation-demodulation method overcomes impact of atmospheric channel on communication and effectively eliminates lower communication code rate and short communication distance of wireless laser communication.

The present invention provides a LoRa-based wireless communication system and belongs to the wireless communication technological field. The system comprises a controller and a LoRa gateway; the LoRagateway and a plurality of LoRa direct nodes form a star network; and each LoRa indirect node is indirectly connected into the LoRa gateway with one LoRa direct node adopted as a relay node. Accordingto the LoRa-based wireless communication system of the present invention, the LoRa wireless technology is adopted, and such communication technology has the characteristics of long communication distance, anti-interference performance, low power consumption and the like, so that the communication technology can adopt the star network architecture, and therefore, the complexity of the system is reduced, and power consumption is reduced; an intelligent node management algorithm can ensure that wireless channels do not conflict with each other; and on the basis of the LoRa wireless technology and the algorithm, a relay function is additionally adopted, and therefore, a transmission distance can be increased manyfold with the real-time performance of data transmission ensured, the wireless diffraction capability of the system can be enhanced, and long transmission distances can be still ensured in complex environments.

A two-hop distant node is recognized by exchanging a Hello message, and an RTS message is transmitted through a doubled transmission distance prior to transmission of a data packet. Each node manages a channel available to a self node and an adjacent node in a channel status table based on the RTS message. A node which tries to transmit the data packet refers to the channel status table, so as to be capable of easily selecting a channel available to the self node and a node of a communication destination. Transmission wireless field strength is enhanced or a modulating system strongly resistant to noises is used so that the RTS message is transmitted at a distance which is not less than twice as long as that of the Hello message and the data packet.

Provided is a dual polarization antenna realized by using four inverted F-type radiators and a Radio Frequency Identification (RFID) reader employing the dual polarization antenna. The dual polarization antenna includes a ground plate and four inverted F-type radiators set up on the ground plate. Currents of the same phase are fed to the first and second inverted F-type radiators each other. Currents of an inverted phase are fed to the third and fourth inverted F-type radiators each other. The four inverted F-type radiators form an angle of 90° with one another. The first and second inverted F-type radiators radiate electric wave of vertical polarization and the third and fourth inverted F-type radiators radiate electric wave of horizontal polarization. Since the dual polarization antenna has excellent orthogonal and isolation characteristics, the antenna can extend a transmission distance between the reader and the tag and improve a communication quality.

The invention discloses a variable-coupling coefficient magnetic resonance wireless power transmission system and a method in the technical field of magnetic coupling resonance wireless power transmission, and mainly solves the problem that the transmission efficiency of the magnetic resonance wireless power transmission system can sharply decrease as the transmission distance increases. By simultaneously adjusting the distance between a source coil and a transmitting coil and the distance between a receiving coil and a load coil, the method ensures that the magnetic resonance wireless power transmission system can meet a critical coupling condition equation and work in a critical coupling state. The invention accurately obtains conditions which need to be met by the critical coupling state of the system, so that the magnetic resonance wireless power transmission system can always work in a high-efficiency mode.

The invention discloses a multiple-input multiple-output antenna transmitting-receiving circuit, and the circuit comprises a radio frequency transmitter and a plurality of transmitting-receiving units. Each transmitting-receiving unit comprises an antenna, a power amplifier, a low-noise amplifier, a first switching unit, and a second switching unit. The power amplifier is used for the power amplification of a to-be-transmitted signal outputted by the radio frequency transmitter, so as to transmit the to-be-transmitted signal. The low-noise amplifiers are used for the amplification of radio frequency signals received by the antennas, so as to transmit the radio frequency signals to a radio frequency transceiver. The first switching units and the second switching units are used for switching a transmitting path according to the transmitting-receiving state of the radio frequency transceiver. The circuit is additionally provided with the switching units so as to achieve the switching of the transmitting path, thereby achieving the isolation of the transmitting path with a receiving path, effectively inhibiting harmonic interference generated between the transmitting path and the receiving path, and improving the isolation degree of adjacent antennas.

A signal processing method, device, and system in a passive optical network are provided. The signal processing method in the passive optical network includes: performing baseband encoding processing on a received service signal; modulating the service signal after baseband encoding processing onto allocated Orthogonal Frequency Division Multiple Access subcarriers through an Orthogonal Frequency Division Multiplexing modulation manner; performing digital / analog conversion on the modulated OFDMA subcarriers to obtain an electric domain Orthogonal Frequency Division Multiple Access signal; modulating the electric domain Orthogonal Frequency Division Multiple Access signal to an uplink optical signal to obtain an optical domain Orthogonal Frequency Division Multiple Access signal; and transmitting the optical domain Orthogonal Frequency Division Multiple Access signal.

The invention discloses a magnetic core structure and an electromagnetic coupling device based on the magnetic core structure. The magnetic core structure comprises an emitter coil magnetic core baseplate and a picking coil magnetic core baseplate, which are square and are parallel to each other during working, wherein a plurality of magnetic winding columns are arranged on the inner side surface of the emitter coil magnetic core baseplate and are uniformly distributed in a rectangular array, while winding slots taking the shape of a Chinese character 'hui' are formed in the inner side of the picking coil magnetic core baseplate. The magnetic core structure and the electromagnetic coupling device have the remarkable effects that the structure of the magnetic core is simple, the processing forming is convenient, the magnetic field concentration ability is strong, the radio energy transmission distance is increased, the wound coil can be selectively powered and controlled, the electrical energy transmission area is adjustable to adapt to position deflection of a picking mechanism, the energy dissipation is small and the transmission efficiency is high.

Disclosed are a near field communication terminal, system and method. The near field communication terminal comprises a secure element (SE), configured to store identification information of the near field communication (NFC) terminal; an NFC module, configured to communicate with a card reader about the identification information over an NFC channel; and a bluetooth module, configured to communicate with the card reader about the identification information over a bluetooth channel. The present invention expands the transmission distance of the NFC terminal, thereby improving the user experience.

In an optical access network using an optical switching device, a 2×1 optical splitter in the uplink and downlink directions is eliminated to extend the transmission distance between the OLT and the ONU. An optical switching device includes a downlink optical switch element for switching a downlink optical signal sent by an OLT, an uplink optical switch element for switching an uplink optical signal sent by a plurality of ONU, an O / E for converting a downlink optical signal to a first electrical signal, an E / O for converting the first electrical signal to a downlink optical signal and inputting the downlink optical signal to the downlink optical element, an O / E for converting an uplink optical signal output from the uplink optical switch element to a second electrical signal, and an E / O for converting the second electrical signal to an uplink optical signal and sending the uplink optical signal to the OLT.

The present invention relates to an optical amplifying apparatus and a complex optical amplifying apparatus which compensate a loss as a function of wavelength of an optical transmission line by a gain as a function of wavelength, and further relates to an optical communication system which includes apparatuses such as an optical transmitting apparatus, an optical repeating apparatus, and an optical receiving apparatus. The above apparatuses and the optical communication system make it possible to broaden a wavelength band and lengthen a transmission distance.

A touch display apparatus including a light guide plate, a light emitting module, a display panel, a plurality of prism structures, an image transmission unit, and an image detector is provided. The light guide plate has a first surface, a second surface opposite to the first surface, and a light incident surface connecting the first surface and the second surface. The light emitting module includes at least one visible light source and at least one invisible light source. The prism structures are disposed between the first surface and the display panel. The image transmission unit includes a wedge portion and a light guide portion. The wedge portion is disposed between the prism structures and the display panel. The image detector is disposed beside the light guide portion for receiving the invisible light beam from the light guide portion. A backlight module is also provided.

The present invention discloses an ultra-long-range distributed fiber Raman photon temperature sensor of an integrated Raman amplifier, and comprises a distributed fiber Raman photon temperature sensor, a distributed fiber Raman amplifier and a fiber grating narrowband reflecting filter. The distributed fiber Raman amplifier is adopted to be embedded into the distributed fiber Raman photon temperature sensor; the gain of the amplifier is used to overcome fiber loss, strengthen the intensity of spontaneous Raman scattering light in the fiber, improve signal-to-noise ratio of the distributed fiber Raman photon temperature sensor system, augment the transmission distance of the distributed fiber Raman photon temperature sensor and improve temperature-measuring precision. With the fiber stimulated Raman scattering effect, the fiber spontaneous Raman scattering effect and the optical time domain reflection principle, the invention skillfully merges the technologies of the distributed fiber Raman amplifier and the distributed fiber Raman photon temperature sensor and achieves the ultra-long-range distributed fiber Raman temperature sensor.

The invention provides a MESH network system applicable to smart home, a networking method and a communication method. The MESH network system comprises a gateway deice, a routing device, and a terminal device. The gateway device is used for communicating with the terminal device directly or via the routing device. The routing device is used for forwarding data. The terminal device is used for collecting data and communicating with the gateway device directly or via the routing device. The gateway device and the routing device respectively search other devices within the communication radius thereof in real time, and are connected with a device of which the power meets a predetermined standard within the communication radius. According to the MESH network system provided by the invention, the transmission distance of the smart home network is increased, and low system energy consumption, reliable transmission and fast networking are realized.

The present invention relates a wavelength conversion apparatus capable of making the wavelength of output light constant even when the wavelength of input light is changed. The wavelength conversion apparatus comprises a first wavelength converter and a second wavelength converter which are provided in series between an input terminal and an output terminal. The first wavelength converter generates four-wave mixing by input light and a first pumping light, generates an intermediate light having a new wavelength by the four-wave mixing, and outputs the intermediate light and the input light. The second wavelength converter generates four-wave mixing by the intermediate light and the input light, respectively outputted from the first wavelength converter, and a second pumping light, generates output light having a new wavelength by the four-wave mixing, and outputs the generated output light.

The invention discloses a data communication server which comprises a power circuit module, a network port module, a microprocessor and a serial circuit module. The network port module, the microprocessor and the serial circuit module are sequentially coupled with one another, and the power circuit module is connected with the microprocessor to provide a working power source for the microprocessor; the serial circuit module is configured in such a manner that serial signals can be processed by the serial circuit module; the network port module is configured in such as a manner that the network port module can be communicated with networks via at least one network port so as to transmit and receive network signals; the microprocessor is configured in such a manner that signals can be converted between Ethernet protocols and serial protocols by the microprocessor, so that the serial signals from the serial circuit module can be converted into the network signals, or the network signals from the network port module can be converted into the serial signals. The data communication server has the advantages that a system with excellent performance and comprehensive functions can be implemented by advanced technologies, data can be transparently transmitted among serial ports and the networks via the data communication server, and the networks can be connected with one another, so that the data can be remotely transmitted.

The invention discloses a multiple access method based on an optical two-dimensional code. The method includes the following steps that firstly, a base-band modulation signal is formed; secondly, a spread spectrum signal is formed; thirdly, the spread spectrum signal drives an LED lamp to send out a two-dimensional code sequence through an LED drive circuit; fourthly, the optical two-dimensional code is recognized and captured to form an image signal; fifthly, a binary digital signal is formed; sixthly, an original optical two-dimensional code information stream is restored through the binary digital signal; seventhly, information is pushed in real time. A visible light communication system of the multiple access method based on the optical two-dimensional code comprises an emission subsystem, a transmission subsystem, a receiving subsystem and a service cloud platform. The emission subsystem is provided with an OOK base-band modulation module, a CDMA encoding module, the LED drive circuit and the LED lamp. The system has the advantages that transmission content of visible light communication can be updated in real time, and corresponding information is pushed according to different application places.

An apparatus for transmitting signals between UWB networks is disclosed, which comprises: a signal converter for converting received optical signals from another UWB network into UWB signals, transmitting the converted optical signals within a UWB network, and converting UWB signals generated from within the UWB network into optical signals; and an optical signal transmission means for directing the received optical signals the signal converter and a further UWB network.