313 results about "Multi code" patented technology

In LMDS systems the downlink bandwidth is continuously varying in time because each downlink burst uses a network termination individual modulation and coding (Physical layer) scheme, the higher layer (IP) functions cannot perform service priority respecting traffic shaping. The invention proposes mainly to combine both framing and IP layer functions within one inter-layer framer. The combination of both information ensures QoS provisioning in case of multi-modulation and multi-coding environment. The QoS queue server gets always informed on the actual amount of available data frame bits from the downlink framer and therefore, the QoS queue server is able to decide on the next IP packet or packet fraction to transport. This decision is always based on service priority aspects. As soon as the downlink frame is filled—supposing that the maximum downlink frame rate is always lower than the internal processing in the inter-layer framer—the QoS server stops the data delivery.

The invention provides a dynamic encryption and unlocking method based on an electronic coded lock. A coded lock system thereof consists of a dynamic code generator and an electronic coded lock control system. The code generator can generate dynamic codes by adopting the multi-code table encryption algorithm and taking the time as parameters. When a user unlocks, both a customized static code and a dynamic code must be input. The coded lock control system decides whether to unlock depending on the correctness of the input codes. The dynamic code based on the parameters of time is just effective and disposable within a given time, so as to be high in security. The coded lock control system gets the clock information of the code generator through the dynamic code, and compares the clock information with the system clock of the coded lock, thus synchronizing the two clocks through the analysis and the compensation of the deviations of the clocks, and ensuring the overall system to run reliably for long.

The invention discloses a multispectral imaging device based on compressed sensing. The multispectral imaging device comprises an imaging objective lens, a first spatial light modulator, a collimation system, a dispersion element, a first convergent lens, a second spatial light modulator, a second convergent lens, a single point detector, a data storage computation module and an image generating loading module. A to-be-tested object is imaged on the first spatial light modulator by the imaging lens, texture and spectral codes of the obtained images are modulated by the spatial light modulators, total light intensity of the modulated images is detected by the single point detector, and scenery multispectral images are obtained by computing according to compressed sensing algorithm and texture and spectral information of multi-coded images. Spectrum scanning is not needed, the single point detector is used to and diffraction limit is broken through, measuring time of an imaging process is short and is further shortened by the aid of the compressed sensing algorithm, and accordingly scenery multispectral images can be acquired quickly.

A multi-code multicarrier CDMA system and method for communicating data by transforming a stream of data into a plurality of code sequences selected from a code book by associating symbols of the data stream with the code sequences of the code book, wherein the codebook includes M code sequences and each of the code sequences has a length of N data symbols, copying each of the code sequences onto one or more of a plurality of subcarriers, transmitting the plurality of subcarriers, receiving the plurality of transmitted subcarriers, demodulating the received subcarriers to result in the code sequences, transforming the code sequences back into the stream of data based upon the associations between the code sequences of the code book and the symbols of the data stream, changing at least one of the number M and lengths N of the code sequences in the code book.

The invention relates to a method and device for constructing low-density parity check-code checking matrix. The constructing method is easy and flexible to implement, because the combination of semirandom constructing mode and structured constructing mode is adopted; besides, the arrays in the basis matrix are arranged in a special manner, the characteristics of irregular codes are achieved and the regularity is ensured. Therefore, the invention not only ensures excellent performance of low-density parity check-code, but also facilitates realization of coding hardware. In addition, short-loop is avoided in the basis matrix during the constructing process, and equal circular shift factors occur in the model matrix; thereby, the checking matrix has no short loop after expansion, and the decoding effect is improved. The invention also provides a group of selected model matrixes that can be expanded into multi-code length. The low-density parity check-code checking matrix with multi-code rate has an extensive application scope and excellent performance.

The invention belongs to the field of digital communication and digital storage, and particularly relates to a method for multi-code-rate coding based on grouped Markov superposition coding. The method is used for coding a binary information sequence shown in a specification to a codon shown in the specification, wherein the length of the binary information sequence conforms to the formula: K=kBL, the length of the codon is nB(L+m[k]), n is larger than 1, k ranges from 1 to n-1, namely, a code rate set is {1/n, 2/n,..., (n-1)/n}, L is the number of kB sequence groups of the same length, and mk is the memory span of each sub code with the code rate being k/n. The method comprises the following steps that firstly, the information sequence is divided into L groups shown in the specification with the equal length and a sequence shown in the specification with the length of nB is initiated when t is equal to -1, -2,...,-(mk-1), -mk; then, when t is equal to 0, 1, ...L-1, a sequence shown in the specification with the length being kB is divided into B groups and the B groups are sent to conversion defined by an n-dimensional matrix H for coding, so that a coding sequence shown in the specification with the length of nB is obtained and combined with elements shown in the specification, and the tth sub sequence shown in the specification of the codon shown in the specification is calculated. The method for multi-code-rate coding is simple in design, wide in code rate range and superior in performance.

Two multi-rate transmission schemes, multi-code (MC) and variable-spreading-length (VSL) code, for realizing multimedia communications on three types of OFDM-CDMA systems are proposed. These systems can be integrated into a programmable structure such that the operation can be controlled and adjusted by system parameters and thus the transceiver can be used in different systems without changing the fundamental hardware and software architecture, which serves the trend of software-radio for future application. A transceiver architecture of multi-rate OFDM-CDMA systems is illustrated and showed its programmability such that the general system can operate under different scenarios with a common hardware structure and reconfigure by software implementation.

An asset tracking unit, system, and method. The asset tracking unit, system, and method may include at least one transceiver having communicative connections with at least one SATCOM network and at least one GPS network via at least one antenna, wherein tracking information for at least one asset associated with the at least one transceiver is received from the GPS network and is communicated to the SATCOM network, a first link that provides a multi-code one of the communicative connections between the at least one transceiver and the at least one SATCOM network, and a second link that provides a multi-channel one of the communicative connections between the at least one transceiver and the at least one GPS network. The unit system and method may additionally include at least one remote operations center remote from an asset to be tracked, wherein the asset to be tracked is geographically associated with the central processing unit.

The present invention discloses a programming-friendly agile code automatic generation system, and relates to the technical field of agile computer programming development. The system solves problems of large limitation and poor scalability of a code generator. The system comprises a code generator, a data description text and a code template. The data description text is input to a code generation engine of the code generator after analyzed; then in combination with the code template, the code generation engine generates an initial code; then a code validator validates the generated code and checks a result; and finally, a code management system manages the generated code and displays the result to a user, and the user selects a next step, such as downloading a code, executing a database statement and more operations. The system provided by the present invention solves the problems of large limitation and poor scalability of the code generator in the prior art, and code generation and decoupling of specific codes based on multi-code templates reduce code coupling degree, improves scalability, and can well meet customized demands.

A signal reception method including method and apparatus for receiving a signal, down converting the received signal through multi-tone down conversion to form an intermediate signal, and decoding the intermediate signal to extract data. In an embodiment, the received signal may include multiple transmission bands of a multi-code (MC)-CDMA signal, each of which occupies a different spectrum. Each of the transmission bands also includes an information channel signal. When the received MC-CDMA signal is down converted through multi-tone down conversion, the intermediate signal is formed. The intermediate signal includes a common spectrum that includes an information channel from a plurality of transmission bands. When the intermediate signal is decoded, data from a plurality of information channel bands is extracted. The method and apparatus may be implemented in a multi-mode MC-CDMA/CDMA receiver.

The invention provides a multifunctional network player, which can achieve the functions of fixed play, multi-code stream selection, multi-picture switching and the like. The player comprises a playing module, a play switching module and a multi-code stream switching module, wherein the playing module is used for starting to play a video from a request time point; the play switching module is used for receiving multi-channel video signals from the same video source and switching a currently played signal into another requested signal according to a request; and the multi-code stream switchingmodule is used for switching the code stream adopted by the current signal to a requested code stream according to the request. The multifunctional network player integrates the functions of fixed play, direct broadcast time-shift playback, multi-picture switching, multi-code stream switching, marking and searching, and local recording, and provides more and more novel services for users.

A base station in a wireless communication network multi-codes a shared packet data channel using a continually changing set of spreading codes, and dynamically updates the transmission frequency of messages identifying the spreading codes to be used for that multi-coding based on tracking the net gain in data throughput for the shared channel that is obtained by transmitting such messages. In a 1xEV-DV network context, for example, a Walsh code in the defined Walsh code space that is not contiguous with the Walsh codes currently allocated to multi-coding the 1xEV-DV Forward Packet Data Channel (F-PDCH) generally remains unavailable for such use until an updated Walsh Mask Broadcast (WMB) message is transmitted to the mobile stations being served on the F-PDCH. The base station thus is configured to determine the frequency at which to send such messages and thereby make the unavailable codes available for multi-coding use.

The invention discloses a method for storing and reading a multi-code-rate stream file and a relevant device. According to the method disclosed by the invention, a multi-code rate file included in a media asset file is subjected to slice processing; an index file is added into a stream file formed by slicing each code rate; sliced files of the multi-code-rate stream file are reassembled and stored under one media asset file, so that media asset resources consisting of the multi-code-rate stream file and small sliced files are benefited to be compatible to a traditional digital television front-end system; and meanwhile, the querying and reading efficiency of the sliced files is increased.

The invention provides a streaming media server with a multi-code-rate transcoding function based on a many-core processor. The streaming media server at least comprises a first processor unit and a second processor unit connected with the first processor unit, wherein the first processor unit is used for conducting processing including multi-code-rate transcoding and slicing on video demand source information and/or live source information based on configuration information from the second processor unit and outputting a processing result; the second processor unit is used for providing a live and video demand service based the information output by the first processor unit and the web technology and providing a human-machine interaction interface through which configuration personnel input the configuration information; the requirement for a live or video demand service is met; meanwhile, cloud transcoding with extremely low delay further can be achieved.

The invention relates to a random multi-code authentication traceability anti-counterfeiting method and belongs to the field of anti-counterfeiting authentication. Labels in various forms such as random two-dimensional codes and RFID chips are printed on sealed packaging boxes and sealed packaging boxes of commodities. Two or more labels are randomly combined and matched to be input into a database. Each commodity has unique identification information. The identification information can be used for commodity identity authentication, and can also be used for identification basis of production,checking, warehousing, discharging and circulating, sales link. In a query link, labels on the commodities and packaging boxes of the commodities are scanned independently or in a combined mode and sent to a database to be inquired. The authenticity is judged according to the returned 'matching' or 'mismatching' query result, meanwhile, the time, place and category (production, warehouse-in and warehouse-out, dealer, retailer, consumer and the like) information of code scanning and checking is recorded by utilizing the block chain technology, and an early warning mechanism is established for the mismatched counterfeit commodity information, so that clues and evidence are provided for counterfeiting.

The invention discloses an FPGA (Field Programmable Gate Array) realization method for a multi-code-length LDPC (Low Density Parity Check) code decoder on the basis of a hierarchical NMS (Network Management System) algorithm, which comprises the following steps of: 1) replacing a check matrix of which the code rate is 1/2 in a WiMax protocol to obtain a new check matrix, and keeping the performance of the original matrix; 2) applying the new check matrix into a parallel hierarchical iterative decoding structure, generating the read-write address of a storage unit in a decoder by an address generation module, and realizing the design of a multi-code-length decoder; and 3) designing a memory structure according to the characteristics of a QC (Quality Control)-LDPC code in the design, and simultaneously reading and writing in information in each path of parallel processing unit. With the FPGA realization method, the storage volume of updated information in the decoding process is reduced, the information updating speed is effectively improved, the decoder iteration times is reduced, the decoding time delay is greatly lowered by the design structure of the memory, and the decoding efficiency is improved. Meanwhile, wiring is simple by a fixed cable of a storage unit and an updating unit, and the hardware realization difficulty is lowered.

The invention discloses a user multi-code management system. The user multi-code management system comprises a display module, a control module, a storage module and an input module. The invention also discloses a user multi-code management method. The user multi-code management method comprises the following steps of; (1) displaying a user input code interface; (2) acquiring user input information, and judging whether the input information is matched with a certain code prestored in a database or not; (3) filtering the database according to preset user access authority which corresponds to the code matched with the input information through a filter; and (4) displaying an individual interface which corresponds to the code matched with the input information. For the user multi-code management system disclosed by the invention, the login name and code corresponding mode in the prior art can be saved, only the user input code interface is displayed in the display module, and the user access authority is preset for each code, thereby entering the individual interface which corresponds to the code by only directly inputting the code in the logging process and further ensuring the user information safety.

The invention relates to a self-adaption switching method and system for multi-coding form program streams. The self-adaption switching method for the multi-coding form program streams comprises the steps that the program streams is grouped according to band width and a coding form, two decoders are provided, a double thread is established simultaneously, the matched band width is determined to perform switch according to network speed, when the coding form is different and needs to be switched, the switch playing is performed by an un-played group, the used group does not need to be reset, so that self-adaption seamless switching is achieved, therefore, the phenomena that the playing is incoherent, or frame skip occurs, or the video picture pauses are avoided, the switching of high definition program streams is greatly guaranteed, great convenience is brought to a user for watching, and the experience of the user is improved. Meanwhile, segmentation downloading is performed on TS streams in groups with a large band width, the problem of pausing is further avoided, further convenience is brought to the user for watching, and the experience of the user is further improved.

A multi-code-rate multi-channel multi-system measurement and control system of a microsatellite comprises a transmit-receive antenna, a USB responder, a spread spectrum responder, an antenna integration USB responder, an antenna integration spread spectrum responder, a microwave network and a comprehensive electronic computer. The comprehensive electronic computer is respectively in communication connection with the USB responder, the spread spectrum responder, the antenna integration USB responder and the antenna integration spread spectrum responder, the USB responder and the spread spectrum responder are in communication connection with the transmit-receive antenna through the microwave network, and the antenna integration USB responder and the antenna integration spread spectrum responder each comprises an integrated measurement and control antenna. The multi-code-rate multi-channel multi-system measurement and control system has the advantages that research cost of a spacecraft is reduced, overall reliability of the tiny spacecraft is improved, the antenna and the responder are integrated, the weight is low and power consumption is low.