10results about How to "Improve communication distance" patented technology

The application provides an AM-PM distortion calibration method applied to an UWB transmitter and belongs to the field of UWB communication. The method adds a sampling resistor between a linear voltage stabilizing power supply LDO and a digital power amplifier DPA driving stage of the UWB transmitter using a digital power amplifier, so as to simulate the instantaneous change of the power supply voltage of the DPA driving stage when the UWB pulse is transmitted; an adjustable delay unit is added between a carrier input port LO and the DPA driving stage; the continuous sine wave is transmitted, the phase information under each digital baseband amplitude control word is collected to form original data of the AM-PM distortion of the UWB transmitter, the digital baseband output AM-PM control word is used to control the adjustable delay unit to output the phase which is opposite to the original data and has the same size, so that the phase predistortion of the transmitted UWB pulse is realized, and the AM-PM distortion calibration is completed. The application has the advantages of simple implementation and strong compensation capacity.

This invention relates to the field of radio frequency communication technology and discloses a communication frequency selection method and apparatus based on RSSI. The method includes: sweeping a target frequency band using step units to obtain a set of sweep points; performing peak detection on the sweep point set to obtain the peak received signal strength and interference frequencies; calculating at least one third-order intermodulation point within the target frequency band based on each interference frequency; fitting the sweep point set, each interference frequency, and each third-order intermodulation point to obtain a target sweep point set; performing weighted calculations on each target sweep point in the target sweep point set based on antenna weighting coefficients and the center frequency to obtain a received signal strength weighted value; and selecting the optimal frequency point based on each received signal strength weighted value. Therefore, implementing this invention can improve the accuracy and reliability of communication frequency selection, extend communication distance, and ensure the comprehensiveness and accuracy of frequency selection, thereby improving the stability and anti-interference capability of wireless audio communication.

The invention relates to an ocean vibroseis energy enhancement structure based on a Fresnel lens, and relates to the technical field of ocean exploration. Comprising a marine vibroseis body, a Fresnel acoustic lens and a second lens. The Fresnel acoustic lens and the second lens are located on the two sides of the ocean vibroseis body respectively. The Fresnel acoustic lens is used for gathering energy on the two sides of the ocean vibroseis body to one side of the ocean vibroseis body, and the second lens is used for gathering energy, adjusting the signal propagation direction, eliminating the cosine error of the Fresnel acoustic lens structure and optimizing the quality of the vibration signal of the vibroseis. According to the method, the energy level output by the seismic source can be effectively improved, the seismic source exploration and communication distance is increased, and the method has important application value and development prospect.

This disclosure relates to a communication method, communication device, Bluetooth device, communication system, medium, and product. The communication method, executed by a first Bluetooth device, includes: generating a target team identifier in response to initiating a team formation operation, the target team identifier being used to form a first communication team; forming a team with the second Bluetooth device in response to receiving a first extended broadcast sent by a second Bluetooth device, the first extended broadcast including the target team identifier and the device identifier of the second Bluetooth device; and sending a first periodic broadcast in the first communication team in response to the completion of the first communication team formation, the first periodic broadcast including communication data to be sent by the first Bluetooth device. Thus, by using Bluetooth Low Energy extended broadcast to achieve team formation for multiple Bluetooth devices, the goal of rapid team formation and flexible entry and exit from teams can be achieved. Furthermore, using periodic broadcast for communication extends the communication distance and improves the communication experience.

This application discloses a GaN-based micro-LED epitaxial structure, device, and fabrication method. The GaN-based micro-LED epitaxial structure includes, along the growth direction, a substrate, a buffer layer, an N-type doped GaN electron injection layer, an active region, and an Al2O3 layer. y Ga 1‑y The substrate consists of an N-type electron blocking layer and a P-type doped GaN hole injection layer; the substrate is selected from a (111) crystal plane single-crystal silicon substrate, a c-axis single-crystal sapphire substrate, a c-axis single-crystal silicon carbide substrate, or a c-axis self-supporting single-crystal gallium nitride substrate; the active region includes an InGaN-based light-emitting structure, which is at least one of an InGaN / GaN alternating multi-quantum-well structure, a GaN / InGaN / GaN single-quantum-well structure, and an InGaN quantum dot structure. This application shortens the carrier radiative recombination lifetime, weakens the quantum-confined Stark effect, and improves the radiative recombination rate by employing a thin quantum well or quantum dot active region structure, thereby enhancing the device's modulation bandwidth and photoelectric efficiency, meeting the performance requirements of light sources for applications such as data center optical interconnects, co-packaged optics, and high-speed visible light communication.

The utility model belongs to full duplex communication technical field, concretely relates to a kind of conversion circuit, conversion module and data transmission device.Conversion circuit is used to realize TTL full duplex communication based on RS-485 interface, including first 485 chip, second 485 chip, first filter unit, second filter unit, first matching resistance, second matching resistance, data transmission interface;First 485 chip is used to electrically connected the RX end of TTL serial port, and with the receiving output end electrically connected of first filter unit, first matching resistance, data transmission interface;Second 485 chip is used to electrically connected the TX end of TTL serial port, and with the sending input end electrically connected of second filter unit, second matching resistance, data transmission interface, to this realizes a kind of communication technical scheme with the advantage of serial port TTL communication and RS-485 communication.

This disclosure provides a metasurface antenna element, comprising a first metal layer, a first dielectric substrate, a second metal layer, a second dielectric substrate, and a third metal layer stacked sequentially; the second metal layer has various shaped cutouts; the orthographic projections of the first dielectric substrate, the second dielectric substrate, and the second metal layer on a preset surface coincide, and their orthographic projection outlines are all first regular polygons; the orthographic projections of the first metal layer and the third metal layer on the preset surface coincide, and their orthographic projection outlines are all second regular polygons; the side length of the first regular polygon is a first preset multiple of the incident wave wavelength at the center frequency, and the side length of the second regular polygon is a second preset multiple of the incident wave wavelength at the center frequency, wherein both the first preset multiple and the second preset multiple are less than 1. This disclosure also provides an antenna structure.

This application discloses a power distribution component and a power grid system. The power distribution component includes a main control box, sub-control boxes, and a first line. The main control box is used for electrical connection to the mains power grid and for electrical connection to loads and / or household distribution boxes. The sub-control boxes are separately installed from the main control box and are used for electrical connection to energy storage devices. The first line electrically connects the sub-control boxes and the main control box, and power is transmitted between the sub-control boxes and the main control box through the first line. The sub-control boxes and the main control box communicate via power line carrier communication through the first line, eliminating the need for additional communication lines. The power distribution component integrates power supply and communication, and the main control box and sub-control boxes can be arranged separately without distance requirements, increasing the installation flexibility of the power distribution component and expanding the application scenarios and scope of use for the power distribution component and energy storage devices.

The invention discloses a magnetic induction multi-hop transmission method and system based on amplification forwarding, which are applied to a magnetic induction multi-hop transmission system comprising N magnetic induction coils, the first coil is a transmitting coil, the second coil to the (N-1) th coil are relay forwarding coils, and the Nth coil is a target receiving coil. The method comprises the following steps: transmitting a signal to a second coil through a first coil, and after the second coil receives the signal, amplifying the signal by adopting an amplification forwarding protocol and forwarding the signal to a next coil until an Nth coil receives the signal from an (N-1) th coil, calculating channel state information of each hop in the (N-1)-hop link and a receiving signal-to-noise ratio of a subsequent coil based on an equivalent circuit model; obtaining an expression of the outage probability and the average bit error rate under the condition of high signal-to-noise ratio based on the statistical distribution characteristics of the received signal-to-noise ratio; and solving the optimal transmitting power and the optimal deployment position of the first coil to the (N-1) th coil by taking the minimization of the outage probability and / or the average bit error rate as a target.

The application relates to a 2.4G wireless communication distance enhancement method based on bit repetition coding. The method comprises the following steps: bit repetition coding is performed on an original binary data bit stream at a sending end to repeatedly send each original bit N times to generate a sending bit sequence after repetition coding; a demodulation bit sequence is obtained after demodulation at a receiving end, the demodulation bit sequence is grouped according to every N continuous bits to obtain a plurality of bit groups, majority judgment is performed on each bit group to output a judgment result, and meanwhile, the judgment results are spliced in sequence to recover the original binary data bit stream; and the application solves the problems that the existing 2.4GHz wireless communication system has insufficient anti-interference capability, poor edge distance communication reliability, and the like under the premise of not increasing transmission power, not changing hardware and not reducing data rate.