Patent application number | Description | Published |
20090110091 | DATA PROCESSING APPARATUS AND METHOD - A data processing apparatus maps input symbols to be communicated onto a predetermined number of sub-carrier signals of an Orthogonal Frequency Division Multiplexed (OFDM) symbol. The data processor includes an interleaver memory which reads-in the predetermined number of data symbols for mapping onto the OFDM sub-carrier signals. The interleaver memory reads-out the data symbols on to the OFDM sub-carriers to effect the mapping, the read-out being in a different order than the read-in, the order being determined from a set of addresses, with the effect that the data symbols are interleaved on to the sub-carrier signals. The set of addresses are generated from an address generator which comprises a linear feedback shift register and a permutation circuit. A generator polynomial for the linear feedback shift register of R′ | 04-30-2009 |
20090110092 | DATA PROCESSING APPARATUS AND METHOD - A data processing apparatus is arranged to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols. The predetermined number of sub-carrier signals is determined in accordance with one of a plurality of operating modes and the input data symbols are divided into first sets of input data symbols and second sets of input data symbols. The data processing apparatus comprises an interleaver operable to perform an odd interleaving process which interleaves the first sets of input data symbols on to the sub-carrier signals of first OFDM symbols and an even interleaving process which interleaves the second sets of input data symbols on to the sub-carrier signals of second OFDM symbols, such that while the input data symbols from the first set are being read from locations in the interleaver memory, input data symbols from the second set can be written to the locations just read from and when input data symbols from the second set are being read from the locations in the interleaver memory, the input data symbols from a following first set can be written to the locations just read from. Furthermore, when the modulation mode is a mode which includes half or less than half a number of sub-carrier signals than a total number of sub-carriers in the OFDM symbols for carrying the input data symbols that can be accommodated by the interleaver memory, the data processing apparatus is operable to interleave the input data symbols from both first and second sets in accordance with the odd interleaving process on to the first and second OFDM symbols. | 04-30-2009 |
20090304023 | NEW FRAME AND TRAINING PATTERN STRUCTURE FOR MULTI-CARRIER SYSTEMS - The present invention relates to a transmitting apparatus ( | 12-10-2009 |
20100034219 | FRAME AND SIGNALLING PATTERN STRUCTURE FOR MULTI-CARRIER SYSTEMS - A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame including at least two signalling patterns adjacent to each other in the frequency direction and at least two data patterns, the transmitting apparatus including signalling mapping means to map signalling data on frequency carriers of each of the at least two signalling patterns in a frame, each signalling pattern having the same length, data mapping means to map data on frequency carriers of the at least two data patterns in a frame, transforming means to transform the signalling patterns and the data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means to transmit the transmission signal. A corresponding transmitting method and a frame pattern for a multi carrier system are also provided. | 02-11-2010 |
20100310016 | RECEIVER AND METHOD - A receiver for receiving a sequence of OFDM symbols transmitted via a channel. Each OFDM symbol comprises a plurality of data bearing sub-carriers on which data is transmitted and a plurality of pilot bearing sub-carriers on which pilot data. The pilot sub-carriers are distributed throughout the OFDM symbols of the sequence in accordance with a pilot sub-carrier pattern. The receiver includes a channel estimator, and the channel estimator includes a pilot data extractor for extracting pilot data from the pilot sub-carriers of each OFDM symbol; a pilot data extrapolator for generating extrapolated pilot data based on pilot data extracted from the pilot data sub-carriers; and a pilot data interpolator operable to process the pilot data by interpolating between the extrapolated pilot data in time and frequency to produce an estimate of the channel. The receiver also comprises a discontinuity detector for detecting a discontinuity in the pilot data processed by the channel estimator, and a controller, which upon detection of a pilot data discontinuity by the discontinuity detector, is operable to provide a control signal to the channel estimator which causes at least one of the pilot data extractor, the pilot data extrapolator and the pilot data interpolator to compensate for the pilot data discontinuity in the pilot data. | 12-09-2010 |
20100310017 | RECEIVER AND METHOD OF RECEIVING - A receiver is arranged to detect and recover data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, which are transmitted as first and second versions to form a multiple input multiple output (MISO) system and which carry pairs of data symbols encoded to form Alamouti cells. The receiver includes a channel estimator and corrector, which is arranged to form an estimate of the data symbols, by generating an estimate of first and second channels via which the first and second versions of the OFDM symbols are received. The receiver includes a channel estimator and corrector comprising a pilot data extractor which is arranged to extract the pilot data from the OFDM symbols, a frequency dimension interpolator which is arranged to interpolate between the pilot data received from each of the OFDM symbols in the frequency domain to form sum pilot data and difference pilot data, a sum and difference decoder arranged to combine the sum and difference pilot data to form for each data symbol of the Alamouti pairs an estimate of a sample of the first channel and an estimate of the sample of the second channel, and an Alamouti decoder. The Alamouti decoder is arranged to receive the data bearing sub-carriers from the OFDM symbols and to estimate the data symbols by performing Alamouti decoding using the estimates of the samples for the first and second channels. As such a receiver for a MISO communication system is arranged to recover an estimate of the data symbols, which have been Alamouti-type encoded using frequency dimension interpolation only. | 12-09-2010 |
20110013732 | RECEIVER AND METHOD - A receiver for detecting and recovering data from Orthogonal Frequency Division Multiplexed (OFDM) symbols. The receiver comprises a demodulator, symbol synchronization unit, frequency transform processor, and coarse frequency offset detector. The demodulator generates sampled symbols. The symbol synchronisation unit has correlators, which receives the sampled symbols, and a correlation detection processor. Each correlator auto correlates each sampled symbol, and the correlation detection processor determines a start point of each symbol. The frequency transform processor receives the sampled symbols and performs a frequency transform on each symbol. The coarse frequency offset detector includes a pilot data filter, which includes taps corresponding to a value and spacing of the pilot pattern of the symbols and arranged to receive as an input the frequency domain symbols from the frequency transform processor, and a coarse frequency offset detect processor, which is arranged to detect a coarse frequency offset output from the pilot data filter. | 01-20-2011 |
20120106673 | ODD INTERLEAVING ONLY OF AN ODD-EVEN INTERLEAVER WHEN HALF OR LESS DATA SUBCARRIERS ARE ACTIVE IN A DIGITAL VIDEO BROADCASTING (DVB) SYSTEM - A data processing apparatus is arranged to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols. The predetermined number of sub-carrier signals is determined in accordance with one of a plurality of operating modes and the input data symbols are divided into first sets of input data symbols and second sets of input data symbols. The data processing apparatus comprises an interleaver operable to perform an odd interleaving process which interleaves the first sets of input data symbols on to the sub-carrier signals of first OFDM symbols and an even interleaving process which interleaves the second sets of input data symbols on to the sub-carrier signals of second OFDM symbols. | 05-03-2012 |
20120213255 | Frame And Signalling Pattern Structure For Multi-Carrier Systems - A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame including at least two signalling patterns adjacent to each other in the frequency direction and at least two data patterns, the transmitting apparatus including signalling mapping means to map signalling data on frequency carriers of each of the at least two signalling patterns in a frame, each signalling pattern having the same length, data mapping means to map data on frequency carriers of the at least two data patterns in a frame, transforming means to transform the signalling patterns and the data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means to transmit the transmission signal. A corresponding transmitting method and a frame pattern for a multi carrier system are also provided. | 08-23-2012 |
20120236880 | FRAME AND TRAINING PATTERN STRUCTURE FOR MULTI-CARRIER SYSTEMS - A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame comprising at least two preamble patterns adjacent to each other in the frequency direction and at least two data patterns, said transmitting apparatus comprising a pilot mapper configured to map the same sequence of pilot signals on frequency carriers of each of said at least two preamble patterns in a frame, each preamble pattern having the same length, a data mapper configured to map data on frequency carriers of said at least two data patterns in a frame a transformer configured to transform said preamble patterns and said data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and a transmitter configured transmit said transmission signal. | 09-20-2012 |
20120327879 | TRANSMISSION APPARATUS AND METHOD FOR TRANSMISSION OF DATA IN A MULTI-CARRIER BROADCAST SYSTEM - A transmission apparatus and method, respectively, mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system. To enable selection of robustness for transmission of data, the apparatus includes a frame forming mechanism mapping data blocks of at least two mapping input data streams onto frames of the mapping output data stream covering the channel bandwidth, each frame including a payload portion, the payload portion including plural data symbols and being segmented into data segments each covering a bandwidth portion of the channel bandwidth. The frame forming mechanism is configured to map the data blocks of the at least two mapping input data streams onto data symbols of the payload portion and includes a MIMO mode selector selecting a MIMO mode of the data blocks per data segment and/or per mapping input data stream. | 12-27-2012 |
20130114760 | DATA PROCESSING APPARATUS AND METHOD FOR INTERLEAVING AND DEINTERLEAVING DATA - A data processing apparatus is arranged to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols. The predetermined number of sub-carrier signals is determined in accordance with one of a plurality of operating modes and the input data symbols are divided into first sets of input data symbols and second sets of input data symbols. | 05-09-2013 |
20130170535 | RECEIVER AND RECEIVING METHOD FOR HIERARCHICAL MODULATION IN SINGLE FREQUENCY NETWORKS - A receiver recovers local service data symbols from first Orthogonal Frequency Division Multiplexed (OFDM) symbols in the presence of second OFDM symbols. The second OFDM symbols carry national broadcast data symbols and modulated on to the sub-carriers of the second OFDM symbols using a first modulation scheme. The first OFDM symbols carry the national broadcast data symbols and the local service data symbols from a local insertion pipe and modulated on to the sub-carriers of the first OFDM symbols using a second modulation scheme. The receiver comprises an OFDM detector which includes an equalizer to recover local service modulated sub-carriers of the second modulation scheme. | 07-04-2013 |
20140233681 | DATA PROCESSING APPARATUS AND METHOD FOR INTERLEAVING AND DEINTERLEAVING DATA - A data processing apparatus is arranged to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols. The predetermined number of sub-carrier signals is determined in accordance with one of a plurality of operating modes and the input data symbols are divided into first sets of input data symbols and second sets of input data symbols. | 08-21-2014 |
20140294124 | TRANSMITTER AND METHOD OF TRANSMITTING AND RECEIVER AND METHOD OF DETECTING OFDM SIGNALS - A transmitter transmits payload data using Orthogonal Frequency Division Multiplexed (OFDM) symbols. The first OFDM symbol is a first type having a number of sub-carriers which is less than or equal to the number of sub-carriers of the one or more second OFDM symbols of a second type and a guard interval for the first OFDM symbol is selected in dependence upon the longest possible guard interval of the second OFDM symbol. Accordingly an OFDM communications system can be formed in which data is transmitted using a frame structure in which a guard interval is adapted to allow a mix of different types of OFDM symbols. | 10-02-2014 |
20150063489 | DATA PROCESSING APPARATUS AND METHOD FOR INTERLEAVING AND DEINTERLEAVING DATA - A data processing apparatus is arranged to map input data symbols to be communicated onto a predetermined number of sub-carrier signals of Orthogonal Frequency Division Multiplexed OFDM symbols. The predetermined number of sub-carrier signals is determined in accordance with one of a plurality of operating modes and the input data symbols are divided into first sets of input data symbols and second sets of input data symbols. | 03-05-2015 |
Patent application number | Description | Published |
20100135316 | FRAME AND DATA PATTERN STRUCTURE FOR MULTI-CARRIER SYSTEMS - The present invention relates to a transmitting apparatus ( | 06-03-2010 |
20120269201 | FRAME AND DATA PATTERN STRUCTURE FOR MULTI-CARRIER SYSTEMS - A transmitting apparatus for transmitting signals in a multi carrier system on the basis of a frame structure, each frame including at least one signalling pattern and one or more data patterns, said transmitting apparatus including frame forming means for arranging first signalling data in the at least one signalling pattern in a frame, and adapted to arrange data in the one or more data patterns in a frame, whereby the data of the one or more data patterns are arranged in data frames, each data frame comprising second signalling data and content data, transforming means for transforming the at least one signalling pattern and the one or more data patterns from the frequency domain into the time domain in order to generate a time domain transmission signal, and transmitting means for transmitting the time domain transmission signal. | 10-25-2012 |
20120320994 | ENCODER AND ENCODING METHOD PROVIDING INCREMENTAL REDUNDANCY - The present invention relates to an encoder for error correction code encoding input data words (D) into codewords (Z | 12-20-2012 |
20120324523 | DEMAPPING APPARATUS AND METHOD FOR RECEPTION OF DATA IN A MULTI-CARRIER BROADCAST SYSTEM - The present invention relates to an apparatus and a corresponding method demapping a demapping input data stream (Q′) having a channel bandwidth received in a multi-carrier broadcast system into a demapping output data stream (Sy′). The demapping input data stream (Q′) comprises, alternately arranged, one or more first and one or more second frames (F | 12-20-2012 |
20130039303 | MAPPING APPARATUS AND METHOD FOR TRANSMISSION OF DATA IN A MULTI-CARRIER BROADCAST SYSTEM - An apparatus and a corresponding method for mapping payload data of mapping input data streams onto a mapping output data stream having a channel bandwidth for transmission in a multi-carrier broadcast system includes first and second frame forming mechanisms. The first frame forming mechanism is adapted to form first frames having a first frame structure and the second frame forming mechanism is adapted to form second frames having a second frame structure. Preferably, in a second frame structure the data blocks of a particular mapping input data stream are spread in time and frequency over various data symbols and various data segments of the second frames to provide high robustness against disturbances. The payload portion of the second frame is preferably segmented into various data segments enabling use of a narrow-band receiver, even if both the first and second frames cover the same total channel bandwidth. | 02-14-2013 |