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4758 results about "Transmission performance" patented technology

Channel-polarization-based encoder for staggered structure duplication code, and encoding and decoding methods thereof

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.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Coder based on repeated coding and channel polarization and coding/decoding method thereof

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.
Owner:BEIJING UNIV OF POSTS & TELECOMM

Optical fiber radio transmission system, transmission device, and reception device

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.
Owner:HASE KAZUTOSHI +2

Measurement gap configuration method and device of multi-carrier polymerization system

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.
Owner:DATANG MOBILE COMM EQUIP CO LTD

Method for deleting repeated data by using double-fingerprint hash check

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.
Owner:HUAZHONG UNIV OF SCI & TECH

Method for preparing grapheme-quantum dot composite film and solar battery structured by using same

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.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI

Upper cover of electric pressure cooker and electric pressure cooker

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.
Owner:FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD +1

Time-sensitive network gating mechanism traffic shaping and route planning scheduling method

ActiveCN111740924AEnsure real-time requirementsGuaranteed Deterministic DeliveryData switching networksPathPingRoute planning
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.
Owner:SHANGHAI JIAO TONG UNIV
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