According to an embodiment, the method of managing the operation of a first apparatus belonging to a first communication system and adapted to exchange wit h i n said first communication system a multi-carriers modulated signal on several sub- carriers, comprises detecting (10) at said first apparatus (APP1) the eventual presence of an interfering signal emitted from a victim apparatus (APP2) on at least one sub-carrier, determining (11) at said first apparatus the path loss between both apparatuses, determining (12) from said path loss and from an allowed interference level at said victim apparatus a maximum allowed transmit power on said at least one sub-carrier of a multi-carriers modulated signal to be transmitted fro m said first apparatus, adjusting (13) within said first apparatus the processing of said multi-carriers modulated signal to be transmitted in accordance wit h said maximum allowed transmit power.
Method of decoding LDPC codes such as IRA codes used in the DVB-S2 standard, the code graph comprising first variable nodes (systematic), second variable nodes (parity) having a degree two, and check nodes connected to second variable nodes by a zigzag connectivity, the method comprising a) grouping the check nodes into at least one group, the check nodes of each group being connected by variable nodes called internal variable nodes, b) performing for each group (GRj) the following sub-steps b1) and b2): b1) jointly updating (71) all the check nodes of said group by using an algorithm of the Maximum-A-Posteriori (MAP) type on a two-state trellis, b2) updating (72, 73) all the first variable nodes and all the second variable nodes (PNi-1,i; PNi,i+1) connected to said group except said at least one internal second variable node, c) iteratively repeating step b). When using a plurality of groups, a corresponding plurality of trellis windows are LogMAP decoded without training period since connecting parity nodes are updated according to the sum-product algorithm.
H03M 13/11 - Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
3.
HIGH DATA RATE TRANSMISSION IN A MULTI BAND OFDM SYSTEM
Method for transmitting information in a multi-band OFDM system, comprising delivering according to a given communication standard an initial data stream (IDS) , splitting (11) said initial data stream into a chosen number of elementary data streams and simultaneously transmitting (12) said elementary data streams according to said communication standard on said communication medium (MD) within different respective sub-bands (SBi) . These sub-bands all blong to the same band group. Proposal based on the MBOA standard.
This method for carrying out the flexible demodulation of data modulated following an amplitude modulation in quadrature is used in a communications system employing a code division multiple access technique (CDMA) and an optical frequency division multiplexing (OFDM) using non-binary spread codes. The invention comprises steps (340) consisting of determining a simplified expression specific to the logarithm of the likelihood ratio.
The method comprises an interference deduction mode (ADIRM) for reducing interferences between a wide band device and a narrow band device; said method is performed within said wide band device and includes the steps of detecting (130) an emssion from and/or a reception performed by said narrow band device, determining (131) from said detection step a group of at least one sub-carrier having frequencies interfering with the narrow band devices, frequencies shifting (132) at least a part of frequncy band of said wide band device including said group of at least one interfering sub-carriers with a chosen frequency shift such that at least a part of frequency band of said narrow band device is excluded from said frequency band of said wide band device.
The method comprises a main interference reduction mode (MIRM) for reducing interferences generated by a wide band device towards a narrow band device. Said method is performed within said wide band device and detecting (40) an emission from and/or a reception performed by said narrow baand device, determining (41) from said detection step a group of at least one sub-carrier having frequencies interfering with the narrow band device determining (42) the bits which correspond to the information carried by said interfering sub-carriers of said group and processing (43) said determined bits such that they are mapped into a reference symbol having an amplitude equal or close to zero.
This is a method for controlling the decoding of a LDPC encoded codeword composed of several digital data, said LDPC code being represented by a bipartite graph between check nodes (CN1) and variable nodes (VNi). Said method compri ses updating messages exchanged iteratively between variable nodes (VN1) and check nodes (CN1). Said method comprises, at each iteration, calculating for each variable node a first sum ( Λn) of all the incident messages ( 阳i ) received by said variable node and the corresponding digital data ( 阳ch) and calculating a second sum (VNRnew) of all the absolute values of the first sums ( Λn), and stopping the decoding process if the second sum (VNRnew) is unchanged or decreases within two successive iterations and if a predetermined threshold condition is satisfied.
H03M 13/11 - Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits using multiple parity bits
H03M 13/27 - Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes using interleaving techniques
H03M 13/45 - Soft decoding, i.e. using symbol reliability information
8.
METHOD OF CODING AND DECODING A PULSE SIGNAL, IN PARTICULAR AN UWB-IR SIGNAL, AND CORRESPONDING DEVICES
The decoding of an UWB-IR signal modulated through a transmitted reference (TR) modulation scheme, comprises subtracting from the UWB-IR modulated signal, a version of said UWB-IR modulated signal delayed with a delay corresponding to the delay used in the TR modulation scheme, and decoding the resulting signal by using a non-coherent detection. Further for providing a more energy efficient way of transmitting information, a method of coding information to be conveyed by an UWB-IR signal, comprises sending within each Pulse Repetition Period (PRP) a reference pulse followed by a pulse train including at least two mutually delayed information pulses. A non-coherent detection may also be used for decoding a signal modulated through a TR-BPPM modulation scheme.
A method for realizing embedded digital television service platform, especially for establishing a kind of digital television service executing platform in a digital television receiving device (i.e. set top box) based on the digital television hardware and driving layer. According to the method, the applications can be independent of the hardware configuration and the software system, and can be directly downloaded to the set top box, so as to provide an application executable and controllable operating environment, and realize digital television data service. The invention belongs to the data transmission field in telecommunication, and is especially applicable to the digital television field. The method defines the following systematic modules based on the driving module: EMS memory management, event management, security control, data download management, network protocol management, graphics module, SI engine, Java virtual machine and application manager etc.
This invention discloses a method for retrieving service information data. The service information data is used for storing and managing the network information, transport stream information and service information applied for digital television application; and it can be conveniently added or extracted via application interface. All the data in database is stored in the form of tables, which comprise device context table, network table, transport stream table, service information table, channel number table, string table and private data table. All the tables are related to ID and key. The method use the direct index strategy, so it can retrieve or locate data in tables quickly and conveniently. It has advantage in speed in comparing with storing the data in the form of list and also resolves the problem that it can not define variable length data blocks in the case of storing the data in the form of array.
This invention discloses a method for accessing carousel data via file system, and especially discloses a technology of randomly accessing and effectively extracting data based on data carousel format and protocol in digital television receiver. It belongs to the digital television receiving field. Carousel data is the data transmission technology applied in digital television field based on ISO/13818-6 data transmission protocol, but in the standard protocol, it is not related to file system, so it is complicated in data acquirement. This invention provides a method for storing data in a buffer, and associating the data with a file system (e.g. virtual file system (VFS)). So, accessing the carousel data just as randomly as accessing the local file and accessing the data effectively and conveniently is achieved.
H04N 7/08 - Systems for the simultaneous or sequential transmission of more than one television signal, e.g. additional information signals, the signals occupying wholly or partially the same frequency band
H04N 7/24 - Systems for the transmission of television signals using pulse code modulation
12.
A METHOD FOR IMPROVING EFFICIENCY OF EVENTS TRANSMISSION AND PROCESSING IN DIGITAL TELEVISION RECEIVING DEVICE
The object of the invention is to provide a method for improving efficiency of events transmission and processing in digital television receiving device. The types of events are identified, the data carrying means are prescribed, and the courses and protocols of the events registration and acquirement are specified, so as to reduce the waiting time of events processing, increase the communication speed among different modules, and improve the efficiency of data processing. The technical solution of the invention method is to design an architecture for events and messages communication in digital television receiving device which specifying the types of events, the formats of carried data, the means of registration and logout, and the strategy of processing, so as to transmit and process events efficiently in different applications and threads. The implement of the invention including the following steps: 1. Registration and logout of event callback function, 2. Sending, receiving and processing of events, 3. Events capture and capture cancellation.
This invention discloses a method for improving the efficiency of extracting EIT. It is achieved by an event information management device in a digital broadcasting receiver, which comprises a cache, loader, analyzer, monitoring and engine. It preloads data and stores the analyzed event information data in a storage directly. So the application can get the wanted data without further processing. Therefore, it avoids the waste of time and system resource caused by multiple times load and analysis which is needed when multiple applications abstract information. And this invention also provides a method for get all the event information data during a predetermined period of time, which improves the utility efficiency of the cache. Therefore, it totally improves the responsive speed and efficiency of the application in lower cost.
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