83results about How to "Improve transmission accuracy" patented technology

The application discloses a method for enhancing transmission reliability of a radio link control acknowledgement (RLC AM) mode. By testing a retransmission receiving correct situation via an RLC layer of a receiving terminal, and optionally actively retransmitting certain PDU by a transmitting terminal according to an unoccupied degree of send windows, a situation of RLC status feedback loss is recognized by the RLC layer of the receiving terminal. Furthermore, by exchanging cross-layer information of MAC and RLC, the MAC layer of each of sending and receiving terminals purposefully performs adjustment of MCS transmission according to the status where RLC ARQ retransmission and feedback in. The transmission quality of ARQ retransmission of PDU and RLC status feedback of PDU are improved; the transmission accuracy of ARQ retransmission and RLC status feedback is increased. The method is beneficial for enhancing transmission reliability of a down link of the RLC AM mode.

The invention belongs to the technical field of wireless communication, and particularly relates to a network-code-based free-space optical cooperative relay communication method. In the invention, a relay node of the system is provided with a baseband signal processing module which can perform the network coding for relay data; in addition, a destination node utilizes a double iterative receiver structure and a network-code-based iterative detection algorithm to detect the information of a multi-source node. The method can provide a space diversity gain to a destination node receiver. The transmission reliability which is higher than that of the traditional multi-source system can be realized; and at the same time, the expenditure of relay equipment can be reduced, and the system capacity can be improved.

The invention discloses a signal transmission method based on acoustic orbital angular momentum multiplexing. The method comprises the following steps that a plurality of mini loudspeakers form a loudspeaker array, sound waves of acoustic orbital angular momentums of different orders are generated as independent channels, wherein the sound waves of the acoustic orbital angular momentums of the different orders are different channels, and each group of binary data streams formed by 0-1 are encoded on amplitudes and phases of the sound waves of one group of channels as signal sources; and (2) the signal source of an input end transmits a sound wave signal of the signal source to demodulation metasurfaces which are arranged in sequence through a transmission pipe, and the sound wave signal detected by a microphone is arranged at the back of each demodulation metasurface and is the original input data stream. According to the signal transmission method based on acoustic orbital angular momentum multiplexing, the signals can be simultaneously loaded to sound pressure values of vortex fields of different orders to carry out synchronous transmission, and meanwhile, the designed demodulation metasurfaces can be utilized to realize high-efficiency separation and detection of different pieces of information.

The invention provides a spectrum resource cooperation access method and system based on geographical location information. The method includes acquiring geographical location information of all acknowledging terminals; selecting a cluster head according to terminal confidence coefficient and the acquired geographical information and clustering all the acknowledging terminals according to the cluster head; acquiring free spectrum information by conducting clustering detection on the acknowledging terminals; conducting access information channel distribution according to the acquired free spectrum information and controlling the acknowledging terminals to conduct spectrum access. By means of the method and system, optimum resource selection can be well achieved, free spectrums are reasonably distributed to necessary acknowledging terminals for access, practicability is good, long-distance transmission errors possibly caused by information transmission of the acknowledging terminals are avoided, system transmission accuracy is improved, and system reliability is improved.

The embodiment of the invention discloses a data transmission method, a data transmission system and related equipment and is applicable to the technical field of communication. According to the embodiment of the invention, in the process of continuously transmitting a random layer of data streams in correspondence to code words to be transmitted for two times, a sending end respectively maps the data streams to equivalent sub-channels of which the channel quality is sequenced at different positions and transmits data according to the channel quality sequencing information of at least two layers of equivalent sub-channels which carry the code words to be transmitted between the sending end and a receiving end, so in the data transmission process, the data are alternately transmitted between the equivalent sub-channels with different relative channel quality grades respectively in the retransmission process of the random layer of data streams in correspondence to the code words to be transmitted, the data are transmitted on the equivalent sub-channels with high or low channel quality, transmission of a plurality of layers of data streams in correspondence to the code words to be transmitted can be approximate in bit error rate, and the whole transmission accuracy of the data is improved.

The invention discloses an LED display screen fault self-recovery control system. According to the control system, a storage unit is divided into two independent storage areas, one storage area is used for storing a program currently running on an LED display screen and display data of the LED display screen, the other storage area is used for storing a backup program, when the program currently running on the LED display screen has a fault or is updated, and the LED display screen automatically switches to the other storage area so that the backup program can run and the display data can be stored. The control system carries out automatic switching on the programs, a receiving card can be replaced without powering off the whole LED display screen, normal work of the LED display screen is not influenced, and the problems that in the prior art, an LED display screen control system cannot be updated on line when the programs are updated, and cannot recover by itself when having a grogram fault or data fault are solved.

The invention relates to a three-dimensional body dimension automatic measuring mechanism capable of measuring without taking off clothes of a measured person, which comprises a pedestal, a cross beam, and a vertical guide rod arranged between the pedestal and the cross beam, wherein the vertical guide rod is sleeved with a scanning device moving up and down along the vertical guide rod and a power drive device driving the scanning device to move up and down along the vertical guide rod to achieve vertical scanning, and the scanning device comprises a stepped motor base, a stepped motor arranged on the stepped motor base, a pulley base provided with a driven pulley, a transverse guide rod arranged between the stepped motor base and the pulley base, a toothed belt for connecting the stepped motor with the driven pulley, a sliding block connected on the toothed belt and moving transversely along the transverse guide rod, and an infrared thermodetector and a scanning head which are arranged on the sliding block. The measuring mechanism not only has the advantages of small volume, light weight and compact structure, but also can measure the naked human body dimension quickly and accurately under the condition that the measure person does not need to take off the clothes.

The invention provides an automatic pulse positioning method based on a flexible force-sensitive sensor array. The amplitude of different sensors in the sensor array in a period of time is compared todetermine whether the sensor is located in the pulse region in order to achieve the purpose of automatic pulse positioning. The invention overcomes the shortcomings of the traditional method that theautomatic initial positioning cannot be carried out, the self-adaptability is low, the transmission cost of the proposed method is high, and the diagnostic accuracy is low. Therefore, an automatic pulse location method is proposed, which can automatically locate the pulse position of human body with low transmission cost, high transmission accuracy and good self-adaptability.

A fault-detection, retransmission and fault-tolerant router unit based on triple modular redundancy comprises an arbitration unit, a switch, a decoding module, four port input units and a local input unit. The arbitration unit performs output sequence control on input data packets and acquires a control signal for outputting to the switch. The switch successively outputs the input data packets according to the control signal. The decoding module performs decoding verification on data which arrive at a target node. Each port input unit is used for receiving input data packets in one direction, performing error verification, calculating a routing path and outputting the data packets according to a link state and a retransmission request which are fed back by a next-grade router. The local input unit receives data which are input through a local port, performing packing processing, performing error verification, calculating the routing path, and outputting the data packets according to the link state and the retransmission request of the target node. The fault-detection, retransmission and fault-tolerant router unit has advantages of improving transmission reliability of the data packets, and satisfying performance requirements of transmission time delay, area, power consumption, etc.

The invention discloses a small-size automatic meat cutting and skewering all-in-one machine, which comprises a machine frame, a skewer releasing device, a skewer pushing device, a meat cutting device, a conveying device and a driving motor, wherein the skewer releasing device, the skewer pushing device, the meat cutting device, the conveying device and the driving motor are arranged on the machine frame; the skewer releasing device is arranged at one end of the skewer pushing device; the meat cutting device is arranged at one end of the conveying device; the skewer pushing device and the conveying device are in adjacent and side-by-side arrangement; the skewer releasing device, the skewer pushing device, the meat cutting device and the conveying device are in synchronous transmission connection through the driving motor. Through the reasonable structure layout, the whole machine size is greatly reduced; the skewer releasing device, the skewer pushing device, the meat cutting device and the conveying device do synchronous operation through being driven by the driving motor; the transmission precision among all devices is improved; an upper mold and a lower mold of a feeding mold are of an integral structure; the error during the combination of the upper mold and the lower mold is avoided; in addition, the skewer conveyance and the pushing are completed on one device; the errorsgenerated in the skewer pushing process are avoided.

The invention discloses a wireless data exchange formation test system and a test method thereof. The test system comprises a downhole instrument and a ground instrument, wherein the downhole instrument comprises a guide shoe, a measuring unit used for detecting downhole data, a downhole computer used for receiving and processing the downhole data and a downhole data transmitting and receiving device used for transmitting and receiving the downhole data, and the guide shoe, the measuring unit, the downhole computer and the downhole data transmitting and receiving device are sequentially connected; the ground instrument comprises a ground signal receiving and sending device used for receiving and sending ground data and a ground computer used for processing data and sending a control instruction to a downhole, and the ground signal receiving and sending device is connected with the ground computer; and the downhole data transmitting and receiving device is connected to the ground signal receiving and sending device through a drill rod or an oil pipe. The wireless data exchange formation test system and the test method realize the real-time wireless transmission of test data and the data exchange between the ground instrument and the downhole instrument and solve the problem that the current test method cannot carry out real-time wireless two-way transmission.

The invention provides a pneumatic sealing assembly of a molding drum transmission box and a method thereof. A transmission sealing device which is in butt joint with a main shaft is adopted so that the combination of pneumatic transmission and sealing treatment is realized when the main shaft rotates so that the whole air tightness of a transmission part is improved and the stability of air pressure in the main shaft is guaranteed. The pneumatic sealing method of a molding drum comprises the following steps that: an inner shaft for bearing a molding drum locking block is sleeved with the inner diameter of the main shaft; a main shaft driving device for driving the main shaft to do peripheral rotation and an inner shaft driving device for driving the inner shaft to do the peripheral rotation are respectively arranged inside a transmission box; the main shaft is in butt joint with the outer side end of the pneumatic sealing assembly and the main shaft is communicated with an air path in the pneumatic sealing assembly; the pneumatic sealing assembly is sleeved on the outer diameter of the inner shaft; the inner side end of the pneumatic sealing assembly and the radial direction of the inner shaft are connected through a rolling bearing and are subjected to sealing treatment; and therefore, when the main shaft and the inner shaft respectively do the peripheral rotation, compressed air is introduced into an air path in the main shaft through the pneumatic sealing assembly.

The invention relates to an Ethernet MAC sublayer controller and a control method thereof; wherein the bus interface of the Ethernet MAC sublayer controller comprises a first bus interface and a second bus interface; the first bus interface and the second bus interface are connected with a sending FIFO (First Input First Output) module through a first output selector and are connected with a receiving FIFO module through a first input selector; a traffic control module comprises a full duplex traffic control module and a half duplex traffic control module; and the full duplex traffic control module and the half duplex traffic control module are connected with the sending FIFO module through a second output selector, are connected with the receiving FIFO module through a second input selector and are connected with a sending end module and a receiving end module. According to the controller and the method provided by the invention, self-adaptive conversion can be carried out among different rates and different communication states; moreover, a target effect can be realized through limitless program modification; and the flexibility better than a normal MAC sublayer control chip is obtained.

The invention provides a synchronous driving control protecting method and device applicable to an IGBT series power module. The method is characterized in that the signal output of each transmission path is adjusted by sending delaying, so that the inconsistency caused by transmission delay in signal transmission process of a main controller can be removed, and the transmission accuracy can be improved; a multi-way IGBT driver on the same bridge arm is used for synchronously receiving a synchronous lock command released by the main controller based on the fault information and then performing synchronous locking of different IGBTs on the same bridge arm according to the synchronous lock command, thus the synchronous lock command receiving and sending consistency can be ensured, and the IGBT synchronous locking consistency is realized, and moreover, the different IGBTs on the same bridge arm can be synchronously triggered. According to the abovementioned technical scheme, the method and the device have the advantages that the dispersing performance of the IGBT drivers is optimized through the communication between the main controller and the IGBT drivers on the premise that no hardware cost is increased, so that the IGBT triggering and fault protection synchronism can be improved, and the reliability of the IGBT series power module in working can be improved.

The invention relates to an underwater acoustic communication link adaptive configuration method based on orthogonal signal division multiplexing modulation, which comprises the following steps of: setting sets of OSDM modulation schemes under different coding lengths of Hadamard, and calculating a signal-to-noise ratio interval under a given error rate; adding a signal segment for environment cognition by a sending end while sending an RTS request channel; and after receiving the RTS, by a receiving end, completing cognition on the environment and calculating and receiving channel related parameters such as a signal-to-noise ratio; by the receiving end, sending a CTS response, and feeding back the corresponding OSDM communication system to the sending end; and after the sending end receives the CTS, adjusting the OSDM communication system of the sending end according to the communication system information in the CTS, so that the corresponding DATA data is sent after the communication systems of the sending end and the receiving end are kept synchronous. Compared with link configuration directly using a single communication mode, the environment cognition link self-adaptive configuration method based on OSDM modulation is more suitable for a real underwater acoustic time-varying channel.

The invention discloses an audio signal encoding method based on terminal operating environments, which comprises the steps that: a terminal obtains source data to be encoded when detecting an audio signal encoding command, and obtains a preset operating parameter of a noise device; the terminal determines encoding frequency corresponding to the obtained operating parameter according to a mapping relation between the preset operating parameter and the encoding frequency; and the terminal encodes the source data into an audio signal by adopting the determined encoding frequency. The invention further discloses an audio signal encoding system based on terminal operating environments. According to the audio signal encoding method and the audio signal encoding system, the terminal transmits the audio signal by adopting a method of avoiding audio frequency generated by the noise device, so that a target terminal can identify the audio signal transmitted by the terminal accurately, and the audio signal transmission accuracy is improved.

The invention provides a floor mopping device with a rotary limiting structure. The floor mopping device comprises a machine body, a floor mopping head assembly, a rotary connection part, a first limiting structure and a second limiting structure, wherein the machine body is provided with a first end, a second end and a shell body which extends between the first end and the second end; the floor mopping head assembly comprises a base which moves on a surface to be cleaned and a wiping element arranged at the bottom of the base; the rotary connection part is used for forming movable connectionbetween the base and the machine body, so that the machine body can rotate between a storage position and an utilization position; the first limiting structure is arranged on the rotary connection part and is used for preventing the machine body from being inclined frontward and/or rotating leftward and rightward at the storage position; the second limiting structure is arranged on the rotary connection part and is used for providing retention when the machine body is located at the storage position; when the machine body overcomes the retention, the machine body can be rotated to the utilization position, so that the gravity center of the floor mopping device at the storage position is stable and is at a vertical state all the time; a condition that a user picks up the fallen machine bodyfor a plurality of times through lowering self gravity center in a cleaning process is avoided, and the technical effects of optimizing a production connection structure and improving the user experience of the user are realized.