90results about How to "Improve reciprocity" patented technology

The present invention relates to a method and arrangement to enhance the communication performance in wireless communication systems. The method of the invention provides a method of calibrating at least one first radio node in a wireless communication network. The communication network comprises at least a first radio node and a second radio node, which can be arranged to be in radio communication with each other. The calibration method is based on that at least one representation of radio channel characteristics, which has been exchanged from one radio node to the other. Whereby inaccuracies and differences in transmit receive chains are compensated and channel reciprocity can be used.

The invention discloses a wind-resistant advertising board comprising a frame and a main board. The main board is composed of a plurality of blades arranged side by side. The blades are hinged to the frame. The frame is provided with a steering driving assembly for inducing wind power to drive the blades to rotate. The steering driving assembly comprises a plurality of gears, racks and a sliding block. The gears are fixed to the plurality of blades. The sliding block extends and has a first windward piece. A windward surface of the first windward piece is parallel to the main board. The sliding block is driven by wind to slide in a direction vertical to the arrangement direction of the blades. The racks are intermeshed with the plurality of gears. The racks are hinged to the sliding block via draw bars. When the sliding block is moving in a first sliding chute back and forth, the sliding block drives the racks to move in the arrangement direction of the blades. The first sliding chute is provided with elastic components to keep the sliding block to reset. The advertising board can be normally used under the normal or breeze condition and is capable of dispelling wind when subject to large head-on wind, and wind resistance of the advertising board is improved.

The present invention provides a method for reciprocity error calibration, comprising steps of: measuring downlink channel response H_DL; measuring uplink channel response H_UL; calculating one of a user equipment reciprocity error E_m and a base station reciprocity error E_b utilizing least square LS criterion based on the H_DL and H_UL in accordance with a reciprocity model H_DL=E_m⁻¹H_UL^TE_b; calculating the other one of the E_m and E_b based on the calculated one of E_m and E_b utilizing an algorithm adopting minimum mean square error MMSE criterion; and performing a reciprocity error calibration operation utilizing the calculated user equipment reciprocity error E_m and base station reciprocity error E_b. There is further provided a reciprocity error calibration device for performing the reciprocity error calibration method. The reciprocity error calibration method and the reciprocity error calibration device according to the present invention may provide better reciprocity error calibration performance.

The invention discloses a pilot frequency sequence generation method and system, wherein the method comprises the following steps that: both parties in communication respectively obtain the channel characteristic of a wireless channel; and the both parties in communication map an estimation value of the channel characteristic in real time to generate a random pilot frequency sequence. With the method and the system provided by the invention, both legal parties in communication can obtain consistent channel characteristics based on the reciprocity of uplink and downlink channels, and further generate the private and random pilot frequency sequence based on characters of physical layer information of a wireless communication system, wherein the generation process is free from transmitting related information in the wireless channel, so that communication security is improved.

The invention discloses an optical sensing device for restraining a voltage sensor temperature error and belongs to the field of an optical voltage sensor. The optical sensing device comprises an optical transmission unit and a Pockels phase sensing unit. The reciprocity degeneration of the Pockels phase sensing unit is caused by the inconsistency of the temperature fields and stress fields of two crystals; and the generation of a measuring error of the optical voltage sensor is caused by the influence of the non-ideal welding angle and counter shaft angle of the optical transmission unit on the magnitude of interference light intensity and feedback phase. By establishing a temperature error model of the optical transmission unit and the Pockels phase sensing unit, a novel optical base structure for counteracting additional stress birefringence in the two crystals is designed, and an angle error compensating method is provided, so that the measuring precision and temperature stability of the optical voltage sensor are increased.

The invention provides a reciprocal type microwave ferrite switch. The reciprocal type microwave ferrite switch comprises a duplex ferrite phase shifter, a three decibels electric bridge A and a three decibels electric bridge B connected to two ends of the duplex ferrite phase shifter in a cascade connection mode; two ports of the three decibels electric bridge A is marked as the port 1 and port 4; two ports of the three decibels electric bridge b is marked as the port 2 and port 3. The duplex ferrite phase shifter comprises two phase shifters, two phase shifters have the same phase shift amount (recorded as 0 status) generated by the microwave signal or have the phase shift amount difference for 180 degrees (recorded as pi); there is no need to transform the magnetization state of the ferrite phase shifter once two ports of the four ports are switched on, and the microwave signal can be transmitted between the on ports in forward direction and reverse direction with reciprocal characteristic. The switch can be used for transmitting the receiving/sending signal without switching the on-off state while used in the microwave system; especially in the application of the radar, the close blind area will not be generated and the performance of the radar can be improved.

Point Optical Link communication security to help resolve the high resource requirements and lack of a trustworthy source of high randomness of existing communication security solutions is described herein. The scheme includes a novel model and a physical layer symmetric cryptographic key generation technique that focuses on exploiting the physical randomness manifested by the PMD effect. This randomness made it extremely difficult for an adversary to generate the same cryptographic keys as the communicating parties. 128 bit keys with low final mismatch rates (≤10%) were generated, which could easily be truncated for 64-bit and 32-bit keys if necessary.

The invention relates to mashing equipment, in particular to medical square tablet mashing equipment for pediatric department. The medical square tablet mashing equipment for the pediatric department can mash tablets automatically, is good in mashing effect and can mash a large number of tablets. The medical square tablet mashing equipment for the pediatric department comprises a bottom frame, a first supporting block, a second supporting block, a material pushing mechanism, an extruding mechanism and an extrusion block, wherein the first supporting block is arranged on the bottom frame; the second supporting block is arranged between the upper part of the first supporting block and the bottom frame; the material pushing mechanism is arranged between the bottom frame and the first supporting block and between the bottom frame and the second supporting block; the extruding mechanism is arranged on the material pushing mechanism; and the extrusion block is arranged on the material pushing mechanism in a sliding mode, and the extrusion block is fixedly connected with the extrusion mechanism. By arranging the material pushing mechanism, people push the material pushing mechanism to operate, so that the material pushing mechanism can push tablets to the position below the extrusion block, and the material pushing effect is achieved.

The invention relates to a complex microorganisms flora grain type ascharite fertilizer and preparation method thereof. The preparation method comprises the steps of: cultivating bacillus subtilis and bacillus mucilaginosus by means of amplifying bacterination, and fermenting and absorbing to obtain complex microorganisms microbial inoculum; stirring and mixing ascharite mineral powder, manganeseore powder, zinc sulfate, bentonite and the complex microorganisms microbial inoculum with a stirring device; pelleting with a pelleting device; drying with a drying device; and screening with a screening device to obtain the complex microorganisms flora grain type ascharite fertilizer. The preparation method specifically comprises the steps of: respectively weighing the raw materials according to components and weight parts in the stirring device to stir and mix for 1-2 h, pelleting with the pelleting device, drying with the drying device, and screening with the screening device under the condition that the temperature is 10-15 DEG C and the pH value is 5-10.5. The fertilizer can provide the nutrition for the growth of crops; can prevent and cure physiological diseases of the crops due to the lack of boron and magnesium; has the functions of solidifying the nitrogen, decomposing the phosphorus and decomposing the potassium, and the like, can change the host specificity of nitrogen fixation, has no side effects to man and beast, and has no pollution to the soil quality as the complex microorganisms flora has high adaptability and stable performance; and can lead the various indexes of the crops to be capable of meeting the requirement of green food after being used, thereby increasing the quantity and improving the quality.

The invention discloses a novel non-intrusive all-fiber reciprocity type voltage electric field sensor. The optical path system comprises a light source, a polarization-maintaining coupler A, a Y waveguide, a polarization-maintaining coupler B, a polarization-maintaining delay optical fiber, a 45-degree optical rotation mirror, a collimator, a lithium niobate waveguide and a reflector, which are sequentially connected through optical fibers. The Pockels effect of the lithium niobate waveguide is utilized to achieve sensitivity to a measured voltage electric field. In the optical path, polarization maintaining optical fiber is used for connection before the 45-degree optical rotation mirror, and then low-polarization optical fiber is used for connection, so that it is guaranteed that two pieces of orthogonal linearly polarized light participating in interference pass through the same optical path in the optical path, and reciprocity of the optical path is achieved. The all-fiber reciprocity type sensitive optical path does not need equal length of two sections of optical fibers, so that the requirement of the system on the process is reduced; the reciprocity ensures the measurementprecision and stability of the system; and the environmental adaptability and the anti-interference capability of the system are improved through all-fiber connection. According to the invention, thesensing head is integrally packaged by using an integrated optical process technology, so that the practicability of the sensor is improved.

The invention discloses a sound pressure sensitivity calibration cavity and a testing method thereof. The calibration cavity consists of two rigid cavities which are a standard cavity and a measuringcavity; the standard cavity is a small volume cavity whose internal and external are in cylindrical shapes, and a transmitting transducer and a reciprocal transducer are installed in the standard cavity during measuring, so that the accurate measuring on standard cavity reciprocal constants and the transfer impedance of the transmitting transducer and the reciprocal transducer can be accomplished;and the internal of the measuring cavity is in a cylindrical shape, and the external of the measuring cavity is a triangular rigid cavity, and during measuring, the transmitting transducer, the reciprocal transducer and a measured hydrophone are respectively fixed on three faces of the triangular cavity, located on the central face of the cylindrical inner cavity and in symmetric distribution. The testing method is a four-transducer reciprocity method. The beneficial effects of the calibration cavity and testing method are that through the calibration by using the double coupled cavity and the four-transducer reciprocity method, the measuring precision of low frequency sound pressure sensitivity can be enhanced, and the measuring on the phase of the hydrophone in the coupled cavity can berealized.

The invention relates to an ultrasonic gas flowmeter signal transmitting-receiving circuit. A transmitting circuit of the ultrasonic gas flowmeter signal transmitting-receiving circuit comprises two control signal sources V1 and V2, a high-frequency transformer T1 with the transformation ratio of 1 to 3 and four power MOSFET, wherein M1 and M3 are P channel reinforced MOSFET, M2 and M4 are N channel reinforced MOSFET, the V1 is connected with g ports of M1 and M4, the V2 is connected with g ports of M2 and M3, s ports of the M1 and M3 are connected with a positive pole of a power supply, d ports are connected to two ends of the high-frequency transformer T1, the s ports of the M2 and M4 are grounded, and the d ports are connected to the high-frequency transformer T1. The connection situation of the four power MOSFET is controlled by controlling the output levels of the signal sources V1 and V2. A transmitting matching resistor RS, a first analog switch S and a transducer are serially connected to the secondary side of the transformer. The ultrasonic gas flowmeter signal transmitting-receiving circuit can eliminate zero errors and zero drift and improve the metering precision of an ultrasonic flowmeter.

The present invention relates to a water-soluble boron fertilizer and a preparation method thereof. The water-soluble boron fertilizer is made of mother liquor of calcium ammonium nitrate and auxiliary agent; wherein, the mother liquor of calcium ammonium nitrate consists of nitric acid, calcium oxide and ammonia; the auxiliary agent consists of boric acid, borax and chelating agent of ethylenediaminetetraacetic acid. In the preparation method, the mother liquor of calcium ammonium nitrate and the auxiliary agent are prepared at first; then the mother liquor of calcium ammonium nitrate is heated in a reactor; the auxiliary agent is put in the reactor and mixed with the mother liquor; the mixture is discharged into a material trough for natural cooling; and the water-soluble boron fertilizer can be prepared after the mixture is cooled, granulated by a pelletizer, dried, screened and packaged.

The invention provides a juice squeezer, and belongs to the technical field of juice squeezing. The juice squeezer comprises a frame body, an actuator and a capsule bag, wherein the actuator also comprises a fixed piece, a movable piece, a driving rod, an acting block and a driver; according to the juice squeezer, a mounting surface is arranged in the frame body, and a surface which is opposite to the mounting surface is arranged as a fixed surface; the actuator is arranged on the mounting surface; a propelling plate is arranged on one side, far away from the mounting surface, of the actuator; the actuator drives the propelling plate to perform reciprocating rectilinear movement along the mounting surface to the fixed surface, so as to extrude a food raw material which is stored between the propelling plate and the fixed surface; therefore, the work of squeezing juice is finished, and the noise is low; the juice squeezer is driven by a motor, and is provided with a speed changing device, so that the thrust of the actuator is greater, the squeezing is more thorough, and the efficiency is higher; by adopting the coordinated movement of a screw and the acting block, the reciprocating property is high, and the working time is effectively prolonged; the capsule bag is arranged between the actuator and the fixed surface, so that squeezed juice cannot be sputtered on components, and the purpose of avoiding cleaning is achieved.

The invention relates to a crushing and briquetting device, in particular to a waste water bottle crushing and briquetting device for resource regeneration. According to the waste water bottle crushing and briquetting device for resource regeneration, the working efficiency is improved, operation is convenient, and the cost is saved. The waste water bottle crushing and briquetting device for resource regeneration comprises bottom plates, a second supporting frame, an accommodating mechanism and a rotating mechanism; four first supporting frames are evenly arranged in the middles of the two bottom plates; the second supporting frame is connected between the upper parts of the two first supporting frames on the right side; the accommodating mechanism is connected among the four first supporting frames; and the rotating mechanism is arranged at the top of the second supporting frame. An output shaft of a first motor drives a first rotating shaft to rotate, so that stirring blades are driven to rotate to crush a waste water bottle, and the crushing effect is achieved.

A cloud diversion system is disclosed and is used to achieve a purpose of reciprocity of consumers and advertisers. The system is mainly formed by a member database, an advertising platform, a clicking and reading module and a diversion module. The member database stores basic member data and the corresponding total number of points. The advertising platform displays an encouragement square in preset time, provides a clicking and reading requirement for a client after the advertisement is watched, and then switches frames and times again. The clicking and reading module correspondingly generates a diversion notification containing a client IP address when the client receives the clicking and reading requirement. When the clicking and reading module receives the diversion notification, if the client IP address does not appear repeatedly in schedule time, the diversion module replies the points to the member database so that the points can be accumulated and simultaneously replies a clicking and reading requirement frequency to a server so as to carry out statistics; otherwise, there is no operation.

The invention belongs to fiber loop winding technology, and relates to a fiber loop winding method for improving optical path reciprocity of a fiber gyroscope. By a two-time step-by-step regulation method, framework width is regulated to be accurately equal to odd times of the radius of a fiber, the numbers of turns of layers in a fiber loop are accurately controlled to be equal, corresponding fiber section positions are approximate, so that correspondence and length symmetry of fiber positions of corresponding turns of adjacent layers in the fiber loop are improved, residual errors in each period are zero after multi-pole symmetric cancellation such as quadrupole symmetric cancellation, optical path reciprocity of the fiber gyroscope is effectively improved, and accuracy and environmentaladaptability of the fiber gyroscope are improved.

The present invention relates to a method for practicing reciprocity of resources, which is a method for acquiring resources privilege of future information communication through sharing information communication resources, wherein at least one information device, including a first information device and a second information device, is installed with communication platform software. The first information device and the second information device are set in information connection with each other. When the first information device uses information communication resources through the second information device, resources privilege stored in a first account of the first information device is consumed. Oppositely, when the first information device provides information communication resources to be used by the second information device, the resources privilege of the first account of the first information device is increased so that reciprocity of network resources is achieved with such a process.

The invention discloses a bentonite machining sand removal device which comprises an outer shell. A first supporting plate is fixedly connected to the bottom of the right side of the outer shell. A motor is arranged on the right side of the top of the first supporting plate. A rotating disc is fixedly connected to an output shaft of the motor. A fixing rod is fixedly connected to the front face ofthe rotating disc. A second supporting plate is fixedly connected to the right side of the outer shell. The right side of the front face of the second supporting plate is movably connected with a vertical plate through a movable shaft. Due to cooperation of the motor, the rotating disc, the fixing rod, the second supporting plate, the vertical plate, a sliding groove, a sector gear, a gear plate,a brush, a supporting rod, a sliding plate, a sliding block, a connecting block and a filter net, the effect of saving time and labor is achieved, the problem that a traditional bentonite sand removal device is low in sand removal efficiency is solved, the working efficiency of a sand removal worker is improved, the quality of bentonite is ensured, and therefore the practicability of the bentonite sand removal device is improved.