OFDM (orthogonal frequency division multiplexing) synchronization method based on multi-transmitting antenna technology

The invention discloses an OFDM (orthogonal frequency division multiplexing) synchronization method based on a multi-transmitting antenna technology, which belongs to the technical field of wireless communication. The method comprises the following steps: sending mutually-orthogonal frequency-domain modulated symbols by transmitting antennas, wherein the frequency-domain modulated symbols are of a periodic repetitive structure; carrying out inverse Fourier transform on the frequency-domain modulated symbols so as to obtain time-domain synchronous symbols; and carrying out frequency offset estimation and timing synchronization by the time-domain synchronous symbol of each transmitting antenna. The method of the invention has the advantage that the OFDM synchronization is performed by usingthe multi-transmitting antenna technology, therefore, the properties of frequency offset estimation and timing synchronization are improved.

Car upset display device

The utility model relates to a car upset display device, the on -line screen storage device comprises a base, the base in be provided with motor and hydraulic control ware, the motor is connected with first gear, first gear and gear train are mutually supported, install the baffle on the gear train, install hydraulic telescoping rod on the baffle, the last backup pad that is provided with of hydraulic telescoping rod, simple structure, spectator need not alternate watching angle, even the many car information that fine the seeing of the same ability is demonstrateed when crowded of people.

Collapsible sleeping berth and install rail vehicle cab of this sleeping berth

The utility model relates to a collapsible sleeping berth and install rail vehicle cab of this sleeping berth, including spreading the body and being used for supporting when the user state spread the supporting leg of the body, the supporting leg with spread to rotate between the body and connect, spread the both ends of the body and connect on the installation face through the slewing mechanism rotation respectively, when packing up the state, the supporting leg is injectd between installation face and the shop's body be provided with on the installation face and be used for injecing the limiting mechanism of supporting leg. The utility model discloses simple structure realizes spreading the decurrent upset of the body through setting up of slewing mechanism and folds, only needs just to lift up during break time the driver, and it is very convenient to operate, can fold when need not use and lean on on the wall of cab, and the supporting leg also can be packed up and fix on the face ...

Alignment control method and control system for installing telegraph pole, equipment and medium

The invention provides an alignment control method, a control system, equipment and a medium for installing a telegraph pole, and the alignment control method comprises the steps: collecting first image information of a second end, close to a preset pit, of the telegraph pole and the preset pit, and analyzing whether the telegraph pole and the preset pit are centered through a first recognition model; under the condition that the telegraph pole and the preset pit are centered, whether the projection of the second end in the vertical direction is in the preset pit or not is analyzed through a second recognition model, and if yes, the telegraph pole is driven to turn over, so that the telegraph pole falls into the preset pit; and the danger to constructors and equipment caused by rollover of the mounting mechanism and the telegraph pole due to collision between the telegraph pole and the ground beside the preset pit after the telegraph pole is overturned is prevented.

Polishing method for improving double-sided rate and filling of monocrystalline silicon wafer and silicon wafer

The invention discloses a polishing method for improving the double-sided rate and filling of a monocrystalline silicon wafer and a silicon wafer, and the method comprises the steps: carrying out the pre-cleaning of the silicon wafer, and removing the dirt on the surface of the silicon wafer; then the cleaned silicon wafer is placed in a polishing solution to be subjected to alkali polishing, a pyramid of the silicon wafer is polished, the polishing solution is formed by mixing potassium hydroxide and a polishing additive, the concentration of the potassium hydroxide is 1.6-2.6 wt%, and the solubility of the polishing additive is 0.8-1.8 wt%; the polished silicon wafer is subjected to post-cleaning, and residues generated by polishing are removed; and finally, the silicon wafer subjected to the post-cleaning procedure is placed in an acid solution for acid pickling, an acid environment is created, and residues on the surface of the silicon wafer are further removed. According to the polishing ...

Method and device for inter-base station controller to implement relocation of base station

Scaffold for arch rib of arch bridge

The invention discloses a scaffold for an arch bridge rib, and relates to the technical field of scaffolds. The scaffold comprises four scaffold frame rods and two rack plates, two limiting holes are formed in one end of each scaffold frame rod, two connecting sleeves are arranged on the lower surface of each rack plate, one end of each scaffold frame rod is in movable contact with the inner wall of the corresponding connecting sleeve, and U-shaped sleeves are arranged on the two sides of each rack plate. The surface of the connecting sleeve is provided with a disassembling and assembling mechanism used for disassembling and assembling scaffold frame rods, and a fixing mechanism is arranged in the U-shaped sleeve. A lead screw is rotated, the lead screw drives a second sliding block to horizontally move along the inner wall of a second sliding groove, and the second sliding block enables a scaffold rod to horizontally move through a connecting sleeve, so that horizontal displacement of ...

Emulsifier special for emulsion explosive and using method thereof

The invention discloses a special emulsifier for emulsion explosives and a using method thereof.The special emulsifier comprises a placing plate, two vertical rods are fixedly connected to the position, close to the rear side, of the top of the placing plate, the two vertical rods are arranged in a bilateral symmetry mode, and a transverse plate is jointly and fixedly connected to the position, close to the bottom, between the two vertical rods; according to the bearing detection device, through mutual cooperation of the clamping blocks, the L-shaped movable plate, the rectangular plate, the adjusting plate, the through rod, the linkage rod, the first fixing plate and other components, bearing positioning can be achieved, so that the state of the bearing is synchronously detected, the detection precision is improved, and the detection efficiency is improved. When the bearing is abnormal, through mutual cooperation of the trigger block, the positioning plate, the spring, the translation ...

Double-sided automatic rubberizing equipment

The invention provides double-sided automatic rubberizing equipment, which comprises a base station, which is provided with a feeding port and a discharging port which are communicated with the inside and the outside of the base station; the rubberizing mechanism comprises a rubber stripping assembly, a rubberizing assembly and a rubberizing platform, the rubberizing assembly moves between the rubber stripping assembly and the rubberizing platform, and the rubberizing platform comprises a lifting rotating module; the material conveying mechanism comprises a feeding assembly, a discharging assembly and a carrying assembly, the feeding assembly and the discharging assembly are arranged on the two sides of the rubberizing mechanism respectively, the carrying assembly moves between the feeding assembly and the discharging assembly, the feeding assembly ascends and descends in the height direction of the base table through a feeding opening, and the discharging assembly ascends and descends ...

Packaging equipment, production line and packaging method

The invention relates to packaging equipment, a production line and a packaging method.The packaging equipment comprises a positioning jig, a packaging mechanism and a transferring mechanism, the positioning jig comprises a film positioning piece and a mica positioning piece, and the relative positions of a protective film and a mica sheet are guaranteed through the film positioning piece and the mica positioning piece; the transferring mechanism is used for moving the positioning jig to a packaging station below the packaging mechanism; the packaging mechanism comprises a scraping plate assembly, a pressing assembly and a jig lifting assembly, the pressing assembly presses the mica sheet to ensure the stability of the mica sheet in the packaging process, and the jig lifting assembly is used for lifting the mica positioning piece to a preset height so that the scraping plate assembly can conveniently fold the edge of the protective film and package the protective film onto the mica sheet ...

Ecological sound screen

This invention discloses one kind of ecology sound barrier which contains box bodyíócollecting annulusíósoil shieldíóheat preservation and thermal insulation layeríóaqueduct and horizontal water injection pipe. Both sides of the vertical box bodyú¼near frontageú¼are upsides and lower parts extendú¼meanwhile middle parts narrow arcsíúThere are collecting annulus setting on the top as well as several fixedly soil shields and activity soil shields using to divide the box body into certain blocks. Trees and flowers can be planted in these blocks, which are filled with clay. According to needs, they can show various characters and pattern. The aqueduct links the collecting annulus to the horizontal water injection pipe which is under the soil shield. So rain water gathered by the collecting annulus can reach every blocks through collecting annulus and horizontal water injection pipe. Box body and soil shield have soundproffing function, while tress, flowers and heat preservation and thermal ...

Positioning system and device for bar planting drilling

The invention relates to a positioning system and device for bar planting drilling, and the positioning device for bar planting drilling comprises four positioning rod pieces; the positioning rod piece comprises a long rod, a short rod and a guide sleeve allowing a drill bit to penetrate through. The long rod and the short rod are welded into a whole; the guide sleeve is welded to a whole formed by the long rod and the short rod; the four positioning rod pieces are sequentially connected end to end to define a closed rectangle, and the four guide sleeves are located in the closed rectangle and distributed in a rectangular mode. The short rod is provided with a threaded hole; the long rod is provided with a plurality of through holes used for adjusting the relative positions of every two adjacent positioning rod pieces. Every two adjacent positioning rod pieces are fixed into a whole in a bolt connection mode, and a bolt penetrates through the through hole of one positioning rod piece and ...

Improved cross-correlation timing synchronization method of orthogonal frequency division multiplexing

The invention discloses an improved cross-correlation timing synchronization method of orthogonal frequency division multiplexing. According to the maximum a posteriori (MAP) estimation, the method derives a result with an additional correction term compared with the conventional timing synchronization methods. Thus, the detection performance of the conventional cross-correlation timing synchronization algorithms is improved.

Sound insulation and absorption materials for high speed train and manufacturing method thereof

The invention relates to sound insulation and absorption materials for a high speed train and a manufacturing method thereof. The sound insulation and absorption materials are formed by compounding a wearing layer, a fiber layer, a damping layer and a foaming layer, the fiber layer is used as the basic cloth layer of the wearing layer, the fiber layer and the damping layer are adhered between the wearing layer and the foaming layer, and the fiber layer is adhered to between the wearing layer and the damping layer. With sound insulation and absorption performances as well as thermal insulation performance, the sound insulation and absorption materials compensate each other on the performance and generate the synergistic effect, so the materials can be applied to the internal surface of the car body of the high speed train to achieve the effects of sound insulation and absorption as well as thermal insulation, such as sound insulation and thermal insulation of side walls and floors. The materials ...

5G network slice resource allocation method and system, terminal equipment and storage medium

The present application is applicable to the technical field of communications, and provides a 5G network slice resource allocation method and system, a terminal device and a storage medium, the method comprising: receiving a network slice use request sent by a user equipment (UE); generating a slice descriptor based on the neural network and the network slice use request; the slice descriptor is sent to a domain composer, the domain composer creates a resource query for the slice descriptor, collects a response of the resource query, and sends the response to the builder; sending the slice descriptor to a builder, and creating an end-to-end network slice by the builder based on the slice descriptor, response and a reinforcement learning method; the end-to-end network slice conforms to the network slice use request. The performance of the whole network and the efficiency of the whole network can be improved.

Miniature analyzer used for ZBX type aviation kerosene on-line analysis system

The invention discloses a micro analyzer that is used in an online freezing point analyzing system of ZBX aviation fuels and comprises an analyzing cup, a through hole is arranged almost at a middle position of the analyzing cup, and two ends of the through hole are respectively connected with an oil inlet and an oil outlet; a black inner cavity surface layer is arranged in a middle section of the through hole and on about one half crown face of a pore wall, and a mirror reflecting plate is arranged on the other half crown face of the pore wall; a transverse hole that is vertically communicated with the through hole is arranged at a position of the analyzing cup that is corresponding to the mirror reflecting plate, an optical fiber sensor is arranged inside the transverse hole, an inlet light silk and an outlet light silk of the optical fiber sensor are respectively connected with two ends of the mirror reflecting plate, the other end of the inlet light silk is connected with infrared incident ...

Collapsible sleeping berth and install rail vehicle cab of this sleeping berth

The utility model relates to a collapsible sleeping berth and install rail vehicle cab of this sleeping berth, including spreading the body and being used for supporting when the user state spread the supporting leg of the body, the supporting leg with spread to rotate between the body and connect, spread the both ends of the body and connect on the installation face through the slewing mechanism rotation respectively spread the body rotate to with installation face is parallel passes through the locking mechanical system locking when packing up the state be provided with on shop's body and be used for prescribing a limit to when packing up the state the limiting mechanism of supporting leg. The utility model discloses simple structure realizes through setting up of slewing mechanism that shop's body makes progress or decurrent upset is folding, only need just put down during break time the driver, and it is very convenient to operate, can fold when need not use by on the wall of cab, and ...

Electric drilling protection auxiliary device and construction method

The invention relates to a drilling protection auxiliary device and a construction method, and the drilling protection auxiliary device comprises a main frame body, a movable body and a movable latch hook assembly; the main frame body comprises a top plate part and a back plate part; the back plate part is fixed to the top plate part; the top plate part makes contact with stand columns of the anti-collision guardrail and is supported by the stand columns. The movable body is used for supporting a cross beam of the anti-collision guardrail so as to limit the relative position between the cross beam of the anti-collision guardrail and the stand column; the movable body is rotationally mounted to the top plate part; the movable body comprises a front plate part and a bottom plate part; the bottom plate part is arranged below a cross beam of the anti-collision guardrail and used for supporting the cross beam. The drilling protection auxiliary device has the beneficial effects that the positions ...

Multi-receiving-antenna frequency offset estimation method used for orthogonal frequency division multiplexing

The invention provides a multi-receiving-antenna frequency offset estimation method used for orthogonal frequency division multiplexing, which applies a multi-receiving-antenna technology to the study of the parameter estimation problem and carries out combination (including equal gain combination, selective diversity combination and maximal ratio combination) on the frequency offset estimation obtained on each antenna so as to eliminate the influence generated by channel fading on the frequency offset estimation and to obtain the optimum frequency offset estimation value. The method provided by the invention is particularly suitable for being used in an actual system, and the performance of the frequency offset estimation can be obviously improved through the equal gain combination and maximal ratio combining mode. When the receiving antennas are few, the performance of the frequency offset estimation can be effectively improved through doubling the number of the receiving antennas.

Monocrystalline silicon wafer texturing method for reducing light reflection loss

The invention discloses a monocrystalline silicon wafer texturing method capable of reducing light reflection loss. The monocrystalline silicon wafer texturing method comprises the following steps: 1, mixing a potassium hydroxide solution with hydrogen peroxide to obtain a solution A, and cleaning a silicon wafer; 2, mixing a potassium hydroxide solution with a texturing additive to obtain a solution B, and corroding the silicon wafer in the solution B to form a pyramid textured surface; 3, mixing a potassium hydroxide solution with hydrogen peroxide to obtain a solution C, and cleaning the silicon wafer; 4, mixing hydrofluoric acid and hydrochloric acid to obtain a solution D to clean the silicon wafer; 5, drying; 6, placing the silicon wafer in a Diesel laser, and carrying out laser texturing; 7, mixing a potassium hydroxide solution with hydrogen peroxide to obtain a solution E, and cleaning the silicon wafer; 8, mixing hydrofluoric acid and hydrochloric acid to obtain a solution F to ...

Large-thickness variable cross-section raft foundation construction technology

The invention discloses a large-thickness variable-cross-section raft foundation construction technology. The technology comprises the steps that a bottom-layer retaining wall is formed, a top-layer retaining wall is formed through pouring, a raft reinforcing steel bar and steel pipe supporting frame is formed, and a raft foundation is poured and formed in a layered mode. The large-thickness variable cross-section raft foundation construction process can effectively solve the construction problem caused by large thickness and large base height difference, effectively deals with a soil layer structure, is very firm in foundation structure, greatly reduces the use amount of reinforcing steel bars, effectively reduces the cost, and is more convenient and efficient in construction.

Process for improving deformation indentation of punched copper foil

The invention relates to a copper foil punching deformation indentation improvement process. A product to be subjected to die cutting is placed on a lower die plate; the lower die plate is fixed, and in the downward pressing process of the upper die plate, the metal pressing block descends along with the upper die plate; after the metal pressing block abuts against the product to be subjected to die cutting, the spring shrinks; the punching cutter moves downwards along with the punching cutter until the punching cutter makes contact with the product to be subjected to die cutting on the lower die plate; after the punching cutter completes punching, the upper die plate is lifted up, and the metal pressing block restores to the initial position under the action of the elastic restoring force of the spring. According to the technology for improving the deformation indentation of the punched copper foil, the metal pressing block is additionally arranged in the upper die for punching the copper ...

Oil smoke purification device for railway vehicle

The invention relates to an oil smoke purification device for a railway vehicle. The oil smoke purification device comprises an inner circulation module and an outer circulation module, wherein the inner circulation module is used for purifying oil smoke which mainly contains water vapor and uses the purified air for circulation in the vehicle, the outer circulation module is used for purifying oil smoke with relatively high concentration and discharges the purified air out of the vehicle; the inner circulation module comprises a first range hood, an inner circulation air flue and a first filtering device; the air inlet of the inner circulation air flue is connected with the air outlet of the first range hood through the first filtering device; the air outlet of the inner circulation air flue is arranged in a carriage; the outer circulation module comprises a second range hood, an outer circulation air flue and a second filtering device; the air inlet of the outer circulation air flue is ...

Nine palace form floor transfer fire -water pond

The utility model provides a nine palace form floor transfer fire -water pond, including base, water tank, output tube, water injection pipe, angle steel cap frame, the piece no. 1 that moves about, stationary blade and activity piece no. 2, the water tank assembly is on the base, output tube assembly terminal surface under the water tank, the water injection pipe is installed at water tank right-hand member face upside, the assembly of angle steel cap frame is at the water tank up end, the stationary blade welding is at angle steel cap frame up end, edges and corners department on stationaryblade left end face is installed to an activity piece right -hand member, edges and corners department on stationary blade right -hand member face is installed to activity piece two left ends, and itis not enough that original transfer fire -water pond installation stability has been solved in this design, appears the condition of empting easily, the great problem of potential safety hazard, theutility ...

Method and device for inter-base station controller to implement relocation of base station

The invention discloses a method and a device thereof for moving a base station of a trans-base station controller. The method includes the following steps: extracting the configuration data of the source base station controller and the target base station controller; selecting the relevant information of the ready-to-move base station from the configuration data of the source base station controller; generating a moving script according to the relevant information of the ready-to-move base station and the extracted configuration data; moving the base station by executing the moving script. The device comprises a generating unit and a loading unit of the moving script. The invention can realize automatic data configuration of the moving base station of the trans-base station controller only through a few intercommunication with the user, thereby enhancing both the efficiency of configuration and the accuracy of the configuration data.

Train and seat thereof

The invention discloses a seat of a train. The seat comprises a fixed end, connecting pieces, a handrail and a leaning part, wherein the fixed end and a train body of the train are fixed; the first ends of the connecting pieces are connected to the fixed end, the second ends of the connecting pieces are connected to the leaning part, and two ends of the handrail are respectively connected to the two adjacent connecting pieces. The invention synchronously discloses the train, which comprises a disabled area, and the seat of the train is arranged in the disabled area. The position of the body of a passenger in a wheelchair can be fixed through holding the handrail, so that danger due to inertia in a travelling process can be avoided. Meanwhile, the leaning part is fixedly arranged on the second ends of the connecting pieces, so that the common passenger without the seat can lean on the leaning part, the area is utilized by the standing passengers, the comfortableness of the passengers is ...