4784 results about "Transmission performance" patented technology

A super-large-effective-area (SLA) optical fiber that is suitable for communicating over a wide wavelength range and that, because of its large effective area, suppresses nonlinear effects that typically result from interaction between signal channels. The effective area, Aeff, of the SLA fiber of the present invention preferably is equal to or greater than approximately 80 μm2 at a wavelength window around 1310 nm. The cutoff wavelength of the SLA fiber of the present invention preferably is less than 1310 nm. Thus, the SLA fiber of the present invention has a very large effective area and a very low cutoff wavelength. In accordance with the present invention, a variety of SLA fibers are provided that all have very large effective areas and desirable transmission properties. The large effective areas of the SLA fibers of the present invention enable nonlinear effects to be suppressed, as well as Stimulated Brillouin Scattering in analog transmission. The large effective areas also enable attenuation to be reduced. The result of suppressing nonlinear effects and reducing attenuation enable signals to be transmitted over long distances and over a broad bandwidth.

Performance measurements for a network, such as delay, delay variation, and loss, are performed over layer-2. A PM frame is sent from a source MEP (Maintenance End Point) to a destination MEP. The PM frame is timestamped immediately prior to transmission, and the local clock at the destination MEP is noted immediately upon arrival. MIPs (Maintenance Intermediate Points) may also time stamp the PM frame. Preferably, each PM frame has an interval (session) identifier and a sequence number within the interval. The PM frames are received by and sent by PM modules within the nodes of the network. The PM modules include a Sender function for sending an interval of one or more PM frames and a Receiver function for receiving PM frames and computing measurements.

The invention discloses a channel-polarization-based encoder for a staggered structure duplication code, and an encoding method and decoding methods thereof. The encoder consists of a duplication bit buffer with a storage capacity of L bits, a bit position mapper with a length N and a channel polarization device with the length N which are connected in sequence. The encoding method based on the encoder comprises the following steps of: embedding duplicated encoding into a channel polarization process, and introducing a duplicated relationship between parts of the bits of code blocks transmitted in sequence during the channel polarization for encoding. In addition, the invention further provides two decoding methods, which comprise the following steps of: decoding by using a simple and rapid successive cancellation (SC) algorithm, and performing iterative decoding by using a Tanner-graph-based belief propagation algorithm with excellent performance. On the basis of the innovative structure encoder, the encoding and decoding methods provided by the invention are stronger in error correction capability under the condition of not increasing the decoding complexity, and the transmission performance is obviously improved. The encoding and decoding methods are particularly applicable to an actual communication engineering system and have a good popularization and application prospect.

The invention discloses a coder based on repeated coding and channel polarization and a coding / decoding method thereof. The coder comprises two coding modules with the same structure; each coding module is provided with a repeated coder group, a bit position mapper with the length of N and a channel polarization device with the length of N, wherein the repeated coder group has m*L output ports and is composed of L sequentially-arranged repeated coders with the repeating times of m; and the two coding modules are connected together through a coding mode selector between the repeated coder and the bit position mapper. The invention provides a concrete method of embedding repeated codes in the channel polarization process to perform channel coding and decoding based on the coder; and compared with the polarization code of the limited length in the prior art, the coding / decoding method disclosed by the invention has stronger error correction capability and obviously improves the transmission performance on the premise of rarely increasing the decoding complexity, is particularly suitable for the practical engineering systems of mobile communication, satellite communication, underwatercommunication and the like, and has good popularization and application prospects.

The invention discloses a turbine fracturing semitrailer. The turbine fracturing semitrailer comprises a semitrailer body, a turbine engine, a reduction gearbox, a transmission mechanism and a plungerpump; the turbine engine, the reduction gearbox, the transmission mechanism and the plunger pump are arranged on the semitrailer body, the output end of the turbine engine is connected with the reduction gearbox, and the reduction gearbox is connected with the plunger pump through the transmission mechanism in a transmission mode. The turbine fracturing semitrailer has the beneficial effects thatthrough linear connection of the turbine engine, the reduction gearbox, the transmission mechanism and the plunger pump in the power-transmission direction, excessive transmission loss can be avoided, and efficient transmission performance is guaranteed; and the whole semitrailer is small in size, light in weight, low in the use cost, and low in failure risks.

The invention discloses a method for selecting demodulation reference signal (DMRS) pattern information. The method comprises the following steps: informing a terminal of selected DMRS pattern information in a preset way through a base station; transmitting a DMRS to the terminal according to the selected DMRS pattern information through the base station. A system and a device for selecting the DMRS pattern information are further disclosed. By adopting the method, the system and the device, different DMRS pattern information can be selected according to different environments to transmit the DMRS, thereby ensuring the accuracy and transmission performance of channel estimation.

An optical fiber radio transmission system is provided which is capable of considerably improving the received dynamic range of radio signals and, in addition, is capable of optically transmitting radio signals while preventing the deterioration of transmission performance and the loss of linearity of an input signal more easily. A received level detection section 111 detects which one of predetermined levels, i.e., Level I, Level II, and Level III, the received level of a radio signal received by an antenna 400 falls under. A signal control section 112 performs an amplification / attenuation process on the radio signal in accordance with the detected level. A control information sending section 113 superimposes control information indicating the detected level on a primary signal obtained after the amplification / attenuation process. This signal is converted to an optical signal and transmitted. An optical to electrical conversion section 211 converts the optical signal received from a transmitting unit to an electrical signal. A control information extraction section 212 extracts the level from the control information, which has been superimposed on the primary signal. A signal control section 213 performs an amplification / attenuation process on the primary signal in accordance with the extracted level.

A method of transmitting / receiving feedback information representing channel quality in a MIMO-OFDM system, in which a receiver measures channel qualities of signals transmitted on a plurality of subbands through a plurality of transmitting antennas by a transmitter, selects a predetermined number of subbands having a highest transmission performance based on the measured channel qualities and preceding information, determines at least one subband group with a maximum rate from among the selected subbands and the preceding information associated with the at least one subband group, and transmits feedback information to the transmitter, the feedback information including channel quality information about the at least one subband group and the associated preceding information.

The invention discloses a measurement gap configuration method and a device of a multi-carrier polymerization system. The method comprises the following steps that: according to the measurement capability of a user terminal reported by the user terminal and the frequency points of a different frequency or a different system to be measured, the measurement gap configuration information of the userterminal is determined, and the measurement gap configuration information instructs to measure the different frequency or the different system to partial or all working member carriers of the user terminal; and the measurement gap configuration information is sent to the user terminal, and the measurement gap configuration information is used for providing the measurement of the different frequency or the different system to the user terminal when in multi-carrier polymerization transmission. The embodiment of the invention respectively configures measurement gaps to partial or all member carriers of the user terminal in a multi-carrier polymerization system, so that the user terminal does not need to stop CA transmission when entering the measurement gaps, thereby improving the data transmission quality and enhancing the transmission performance of the system and the system capacity.

A method and apparatus are provided that optimizes a transmitted user-specific signal. In one embodiment, the invention includes receiving signals from a remote radio, deriving estimates of receive channels corresponding to the received signals using the received signals, deriving a model of an expected transmit channel to the remote radio based on the receive channel estimates, deriving a set of transmit parameters to be applied to an array of transmit antennas to transmit a signal to the remote radio by optimizing a transmit power criteria using the model of the expected transmit channel and constraints on the estimated quality of a signal transmitted over the expected transmit channel, and transmitting to the remote radio by applying the derived set of transmit parameters to the transmit antenna array.

A diversity OFDM communication is performed between a base terminal and a mobile terminal, both having a horizontal polarization antenna and a vertical polarization antenna forming two transmission channels. In the base terminal, data signals to be transmitted are divided into two channels to transmit the data signals through either one of the channels having a higher transmission performance for each sub-carrier. Common pilot signals are transmitted through both channels. The data signals received by the mobile terminal are phase-adjusted using the common pilot signals. The phase-adjusted data signals in both channels are synthesized and then demodulated.

A method and apparatus for optimizing transmission performance of a mobile terminal by adjusting a matching value of the transmitter of the mobile terminal based on the allocation information from the network are provided. The transmission performance optimization method of a mobile terminal according to the present invention includes acquiring allocation information from a network, searching for a group of information matching the allocation information from a predetermined mapping table, generating a control signal for adjusting a match value according to the group, and adjusting the matching value of a transmitter of the mobile terminal by changing impedance according to the control signal.

The invention provides a spraying robot driven by multiple parallelogram links in parallel. The spraying robot comprises a pedestal (3), a big-arm driving motor (4), a small-arm driving motor (10), a pitch adjusting motor (8), a movable platform (18) and three paralleled parallelogram link mechanisms. The spraying robot is characterized in that the big-arm driving motor (4), the small-arm driving motor (10), and the pitch adjusting motor (8) are all arranged on one end of the pedestal (3), and the three paralleled parallelogram link mechanisms cooperate with one another to drive the movable platform (18). According to the invention, a three-parallelogram-link driving manner is employed, when the three parallelogram link mechanisms are designed, the maximum pressure angle is limited, in the working range, no matter the robot rotates to any position, the transmission performance of movements and forces can remain excellent.

An embodiment of the invention provides a method for transmitting control information, a user device and a base station. The method for transmitting control information comprises of the steps of obtaining resource index of a physical uplink control channel (PUCCH), wherein the PUCCH is sued for transmitting uplink control information (UCI); obtaining sequence index of an orthogonal sequence of the PUCCH according to the resource index and obtaining the orthogonal sequence according to the sequence index; obtaining cyclic shift of a reference signal of the PUCCH according to the sequence index; and transmitting the UCI to the base station on the PUCCH according to the orthogonal sequence and the cyclic shift. The cyclic shift of the reference signal of the PUCCH for transmitting the UCI is obtained according to the sequence index, and the UCI is transmitted on the PUCCH according to the cyclic shift and according orthogonal sequence, and the UCI transmission performance can be improved.

The invention provides a method for deleting repeated data by using double-fingerprint hash check. The method comprises the following steps of: dividing an object to be backed up into data blocks to be backed up with equal lengths; judging whether the weak fingerprint of one of the data blocks to be backed up is the same as the weak fingerprint of any data block in a server; if the weak fingerprint of one of the data blocks to be backed up is different from the weak fingerprint of any data block in the server, backing up the data block; if the weak fingerprint of one of the data blocks to be backed up is the same as the weak fingerprint of any data block in the server, judging whether the strong fingerprint of the data block is the same as the strong fingerprint of any data block in the server; if the strong fingerprint of the data block is different from the strong fingerprint of any data block in the server, backing up the data block; and performing the operation on all data blocks to be backed up. In the method for deleting the repeated data, a hash function with low calculation amount is adopted at the first time to perform weak check on every data block and a has function with high calculation amount is adopted then to perform strong check, so the problem that all the data are checked by the hash function with the high calculation amount is avoided, the fingerprint calculation amount during checking is reduced greatly, the series performance is enhanced, and the appreciable transmission performance is provided for data backup based on mass data storage.

The present invention provides a transfer control protocol handoff notification (TCPHN) mechanism for a wireless network by which hosts connected through the wireless network via a transfer control protocol (TCP) connection can be notified in the event a handoff occurs. The TCPHN mechanism allows hosts connected in TCP to avoid TCP timeouts and reduce any adverse effect on transmission performance. The TCPHN mechanism of the present invention can be used in relation to any TCP connection between any transmitting and receiving host where at least one of the transmitting and receiving hosts is mobile and subject to handoffs. In one embodiment for example, the TCPHN mechanism is used in relation to a TCP connection between a mobile host in a wireless network and a non-mobile server host in a connecting Internet protocol (IP) network.

A catheter includes a sheath main body portion, a first lumen, a sheath distal end portion, and a second lumen. The sheath main body portion is inserted into an organism. The first lumen is a passage provided in the sheath main body portion and through which a guide wire for guiding the sheath main body portion in an organism can be passed. The sheath distal end portion is provided on a lateral side of a distal end portion of the sheath main body portion. The second lumen is a passage different from the first lumen, provided in the sheath distal end portion, and through which a guide wire can be passed. The catheter can have both ease of exchange of catheter, which is the merit of an RX type catheter, and distal end pushing force transmission performance (pushability), which is the merit of an OTW type catheter.

A composition for enhanced heat transfer fluid performance, comprising a base heat transfer fluid and a nanometer sized phase change material. Introduction of nanometer sized phase change material into the heat transfer fluid leads to improved, high reversible thermal transport properties at elevated temperatures while ensuring low viscosity of the fluid at sub-freezing temperatures. A method for preparing of the heat transfer fluid with enhanced heat transfer performance, comprising making nanometer sized capsules having the phase change material contained therein and dispersing the capsules into the base heat transfer fluid.

A transmission control apparatus for improving PCT bi-directional transmission performance in an end node or gateway node of an asymmetric bandwidth pre-allocated subscriber network. The transmission control apparatus includes a TCP classification module for acquiring a TCP ACK packet to be transmitted over an uplink during bi-directional transmission; a band-width estimation / prediction module for estimating bandwidth of a downlink corresponding to the uplink at a time when the ACK packet is acquired, predicting following bandwidth of the downlink according to the estimated bandwidth, and calculating a optimal window size of the downlink such that the predicted bandwidth maintains residual bandwidth enough to allow transmission of an ACK packet over the downlink link compared with the maximum bandwidth allocated to the downlink; and a controller for inserting the calculated optimal window size as a reception window size included in the ACK packet and delivering the ACK packet to a destination node.

In a discrete multi-tone modem, a method of minimizing cross talk over a twisted pair of a twisted pair cable binder in which discrete multi-tone data transmission is utilized comprises the steps of one of jointly minimizing near end cross talk while maximizing total data rate, jointly minimizing an arbitrary function of total power while maximizing total data rate and minimizing total near end cross talk for a given data rate, selecting a function to be optimized and performing a bit and power allocation algorithm responsive to the selected function. The process may be combined with known optimization functions such as jointly minimizing an average bit error rate while maximizing the data rate. As a result, the process is considerably more flexible and adaptable to changing parameters such as environmental parameters impacting data transmission performance in the presence of cross talk. Either a telecommunications central office modem or a remote terminal modem may be so adapted to apply such a cross talk minimization method.

The invention relates to a method for preparing a grapheme-quantum dot composite film and a solar battery structured by using the same. The method comprises the following steps of: performing suction filtering on a suspension of grapheme-quantum dot composite powder on a filtering film to obtain a film; and then dissolving the filtering film away with an organic solvent, and transferring the filmto a conductive substrate. The method is characterized in that the ratio of the quantum dot to the grapheme and the thickness of the film can be controlled effectively; in addition, since the film isprepared at normal temperature, the requirement on the conductive substrate is reduced greatly. The prepared film can be used for structuring a novel quantum dot sensitized solar battery. The structured solar battery is of a layer structure, consists of the grapheme-quantum dot film on the conductive substrate, an electrolyte layer and a counter electrode and has the advantages of low cost, simpleness in preparation process, low temperature and stable performance. By the use of the grapheme-quantum dot composite film prepared by the method provided by the invention, the photoelectron transmission performance can be improved, and the photoelectric conversion efficiency of a battery can be enhanced.

A method of controlling signal transmission in a Multiple Input Multiple Output (MIMO) communication system including selecting a modulation and code set (MCS) for each of M data streams transmitted via M transmitting antennas in a transmitting side of the MIMO system, and selectively selecting M-1 or fewer transmitting antennas from the M transmitting antennas for transmitting the data streams based on channel quality information indicative of a transmission performance of the selected MCS corresponding to each of the M transmitting antennas. In another example, the present invention provides a novel method of controlling signal transmission in a MIMO communication system including selecting M weight vectors for streams transmitted by each of M transmitting antennas in a transmitting side of the MIMO system, and selectively selecting M-1 or fewer streams and weight vectors from the M weight vectors for transmitting data streams based on channel quality information indicative of transmission performance of the selected weight vectors corresponding to each of the M vector spaces.

The invention discloses a robot reducer transmission performance comprehensive testing device. The robot reducer transmission performance comprehensive testing device comprises a base (14), wherein a drive motor (1), a first coupling (2), a reducer input end torque angular displacement sensor (3), a second coupling (4), a to-be-tested reducer (5), a third coupling (6), a reducer output end torque angular displacement sensor (7), a fourth coupling (8) and a brake (9) are arranged on the base (14), share the same axis on the level direction, and are connected in sequence, and the drive motor (1), the reducer input end torque angular displacement sensor (3), the to-be-tested reducer (5) and the reducer output end torque angular displacement sensor (7) are respectively arranged on the base (14) through a motor support (10), a first support (11), a to-be-tested reducer support (12) and a second support (13). The robot reducer transmission performance comprehensive testing device meets the requirements of transmission performance tests such as high precision composite roller movable teeth transmission reducer ratio, return difference and efficiency, and thus testing efficiency and testing accuracy are high.

The invention provides an upper cover of an electric pressure cooker and the electric pressure cooker. The upper cover of the electric pressure cooker includes: an inner cover, which has a mounting hole in the middle; a pivot, which is installed at the mounting hole and can rotate around the axis of the mounting hole; a pot cover, which is located below the inner cover and connected to the pivot. And the pivot and the pot cover can rotate together; and the handle is located above the inner cover and is rotatably installed on the inner cover, and the handle is on the side of the mounting hole and the pivot; wherein, one of the handle and the pivot is provided with The first transmission part and the other are provided with a second transmission part, and the first transmission part and the second transmission part are engaged in gear transmission to assist in realizing the rotation of the handle drive pivot and the pot cover together. The upper cover of the electric pressure cooker provided by the present invention has a simple installation structure; in addition, gear transmission is adopted between the handle and the pivot shaft, and the transmission performance is stable and reliable, thereby improving the stability of the electric pressure cooker when opening and closing the cover, and better ensuring the safety of users. use experience.

An embodiment of the invention discloses an upward resource scheduling method of a TDD system, a system and a device, realizing dynamic scheduling on the upward resource on the basis of ensuring optimal transmission performance. The upward resource scheduling method comprises: a base station distributes upward resources for transmitting upward data on the user equipment, and transmits upward resource distribution information including upward sub-frame indexes in the sending time span corresponding to the upward sub-frame occupied by the upward resource, the sending time span corresponding to the upward sub-frame is arranged in advanced; the user equipment receives the distribution information, determines the upward sub-frame according to the upward sub-frame indexes and the upward sub-frame scheduling strategy, and transmits the upward data on the upward resource indicated by the distribution information in the upward sub-frame. An upward resource scheduling system comprises: user equipment and a base station. The embodiment of the invention also discloses a base station and user equipment.

The embodiment of the invention discloses a scheduling and reporting method, system and device of uplink control information, relates to the technical field of wireless communication and aims to increase the transmission performance of uplink control information. In the method in the invention, a base station schedules terminals to report uplink control information periodically through a physicaluplink shared channel (PUSCH) and the terminals report uplink control information periodically through the PUSCH according to the scheduling of the base station. When the coverage of the physical uplink control channel (PUCCH) is not comprehensive enough and the reliability of the periodic uplink control information which is originally transmitted in the PUCCH can not be ensured, the transmissionperformance of the uplink control information can be greatly increased by reporting uplink control information periodically through the PUSCH.

Disclosed herein is an optical access network system in which the transmission quality of an upstream signal is remarkably improved in an optical access network in which a Reflective Semiconductor Optical Amplifier (RSOA) is used as the light source for each subscriber. The most important characteristics of the present invention are that a Manchester modulation format is used as a modulation format for a downstream signal in an optical access network system in which an RSOA is used as the light source for each subscriber, so that the problem of deterioration of the transmission quality of a remodulated upstream signal, occurring when an RSOA is used as the light source for each subscriber, is solved, and thus the transmission performance of an upstream signal and the power budget performance of the entire system are improved. According to the present invention, an RSOA-based WDM PON system, in which performance at a power budget and the transmission performance of a remodulated upstream signal are improved, can be implemented.

The present invention provides a special pilot frequency transmission method of the LTE system. When the base station schedules the physical descending control channel and special pilot frequency onto the identical symbol in the sub-frame of the LTE system, the base station only transmits physical descending control channel on the identical symbol. The present invention solves the interfere problem between the physical descending control channel and the special pilot frequency, thereby ensuring the transmission performance of the physical descending control channel.

The invention discloses a time-sensitive network gating mechanism traffic shaping and route planning scheduling method, and relates to the technical field of wired communication networks. The method comprises the following steps of: performing routing and transmission joint scheduling on periodic TC traffic according to real-time requirements and priorities, and performing communication transmission scheduling of non-TC traffic on the premise of not influencing deterministic real-time transmission of the TC traffic; according to a TC queue GCL design and a GCL cycle idle period plan, generating an output queue GCL of each switch port, generating an optimal joint scheduling scheme of mixed traffic transmission based on the optimal communication transmission path set of the TC traffic and the non-TC traffic, generating configuration files of the switch ports and the terminal equipment through related configuration software, and configuring the configuration files to each switch and the terminal equipment. On the premise of ensuring multi-period TC traffic deterministic real-time transmission with different real-time requirements, the communication transmission performance of the non-TC traffic is improved as much as possible, and the problems of communication resource waste and schedulable solution space reduction are avoided.