Patent application number | Description | Published |
20080219375 | APPARATUS AND METHOD FOR SPATIAL MULTIPLEXING WITH BACKWARD COMPATIBILITY IN A MULTIPLE INPUT MULTIPLE OUTPUT WIRELESS COMMUNICATION SYSTEM - An apparatus and method for supporting both a receiver using a single antenna and a receiver using multiple antennas in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus and method in a MIMO wireless communication system include a first synthesizer for generating a first Transmit (Tx) signal by adding a first signal and a second signal, a second synthesizer for generating a second Tx signal by subtracting the second signal from the first signal and a plurality of transmitting units for transmitting the first Tx signal and the second Tx signal through corresponding antennas. Accordingly, receivers having either a single antenna or multiple antennas may be employed in the same communication system. | 09-11-2008 |
20080225983 | APPARATUS AND METHOD FOR SELECTING A MULTI-ANTENNA TRANSMISSION METHOD IN A BROADCASTING SYSTEM - An apparatus and a method for transmitting broadcasting signals in a broadcasting system having multi-antenna are provided. The apparatus comprises at least one antenna, a signal generator for generating two or more broadcasting signals to be transmitted, at least two of the two or more broadcasting signals being generated according to different user-required quality characteristics, a multi-antenna modulator for modulating each of the broadcasting signals according to one of a plurality of multi-antenna transmission methods selected for each of the broadcasting signals according to the user-required quality characteristics of the respective broadcasting signals, and a transmitter for transmitting the modulated signals via the at least one antenna. | 09-18-2008 |
20080260053 | Apparatus and method for transmitting and receiving data using space-time block coding - An STFBC coding apparatus for a transmitter with four Tx antennas is provided. In the transmitter, an encoder generates a code symbol vector by encoding an input symbol sequence in a predetermined coding method. A grouping block permutes the elements of the code symbol vector by multiplying the code symbol vector by a permutation antenna grouping pattern selected among predetermined permutation antenna grouping patterns according to a predetermined order and outputs the permuted code symbol vector as a grouping symbol vector. OFDM (Orthogonal Frequency Division Multiplexing) modulators OFDM modulate the grouping symbol vectors and transmit OFDM modulated symbols through the four transmit antennas. | 10-23-2008 |
20080298490 | APPARATUS AND METHOD FOR REDUCING PEAK TO AVERAGE POWER RATIO IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM - A method for reducing a Peak to Average Power Ratio (PAPR) using reserved tones in a transmission apparatus of an Orthogonal Frequency Division Multiplexing (OFDM) communication system is provided. The method includes detecting a subcarrier spacing interval and the number of spaced symbols based on a predetermined pilot pattern upon signal reception, and determining positions of shifted reserved tones obtained by shifting positions of reserved tones allocated to a predetermined symbol during the number of the spaced symbols at intervals of the spacing interval; determining an impulse waveform obtained by rotating a phase of a complex value of an impulse stored in a memory, using the determined positions of frequency-domain reserved tones of each symbol; calculating a subtrahend for a PAPR of an output signal using the phase-rotated impulse waveform; and reducing a PAPR of an input signal by performing a gradient algorithm using the phase-rotated impulse waveform. | 12-04-2008 |
20090010350 | APPARATUS AND METHOD FOR DETECTING SIGNAL USING MULTIVARIATE POLYNOMIAL IN MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM - A signal detection apparatus and method in a Multiple Input Multiple Output (MIMO) wireless communication system are provided. The apparatus includes a receiver for receiving training symbol vectors and a data signal vector from a transmitting end through a plurality of receive (Rx) antennas and a detector for expanding the training symbol vectors into second- or higher-order polynomials, for generating a weighting parameter vector for multivariate polynomial expansion of the data signal vector by using the polynomials expanded from the training symbol vectors and thereafter for expanding the data signal vector into a second- or higher-order multivariate polynomial using the weighting parameter vector, and for detecting Transmit (Tx) values of the data signal vector from the multivariate polynomial. Therefore, signal detection performance in a Multiple Input Multiple Output (MIMO) wireless communication system resembles that of a non-linear scheme while complexity resembles that of a linear scheme. | 01-08-2009 |
20090063929 | Apparatus and method for transmitting and receiving data in a communication system using low density parity check codes - An apparatus for transmitting data in a communication system using a Low Density Parity Check (LDPC) matrix is provided. The apparatus includes an interleaver for interleaving a descending bit-ordered codeword having a predetermined size and in accordance with a predetermined modulation scheme; and a bit mapper for mapping codeword bits constituting the interleaved codeword in accordance with a predetermined mapping scheme that takes into account degrees of the codeword bits and reliability characteristics of modulation symbol-constituting bits based on the predetermined modulation scheme. | 03-05-2009 |
20090070652 | APPARATUS AND METHOD FOR CHANNEL ENCODING/DECODING IN COMMUNICATION SYSTEM USING VARIABLE-LENGTH LDPC CODES - A method and apparatus for generating Low-Density Parity Check (LDPC) codes of various block lengths from a structured LDPC code in a communication system is provided. To support various block lengths, predefined rules are applied to a parity check matrix of an LDPC code, and then shortening is selectively applied to the parity check matrix. Subsequently, if information data bits are input, the input data information bits are encoded into an LDPC codeword by using the parity check matrix according to a preset encoding scheme, and then the encoded LDPC codeword is transmitted after puncturing is selectively applied. | 03-12-2009 |
20090125781 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN A COMMUNICATION SYSTEM USING LOW DENSITY PARITY CHECK CODE - A method for transmitting data in a communication system using a Low Density Parity Check (LDPC) matrix includes generating an LDPC codeword by encoding information data bits, interleaving the LDPC codeword, mapping the interleaved LDPC codeword to a modulation signal, and generating a mapped signal by mapping the LDPC codeword bits separately to a bit corresponding to a real part and a bit corresponding to an imaginary part of said modulation signal, among bits constituting the modulation signal, generating a modulation signal by high-order-modulating the mapped signal and Radio Frequency (RF)-processing the modulation signal, and transmitting the RF-processed signal via a transmission antenna. | 05-14-2009 |
20090158129 | METHOD AND APPARATUS FOR ENCODING AND DECODING CHANNEL IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - A method for encoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code. The method includes generating a plurality of column groups by grouping (categorizing) columns corresponding to an information word in a parity-check matrix of the LDPC code, and ordering the column groups; determining a range of an information word desired to be obtained by performing shortening; based on the determined range of the information word, performing column group-by-column group shortening on the column groups in order according to a predetermined shortening pattern; and LDPC encoding the shortened information word. | 06-18-2009 |
20090190039 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING PREAMBLES IN A DIGITAL VIDEO BROADCASTING SYSTEM - An apparatus and method for transmitting a preamble in a Digital Video Broadcasting (DVB) system are provided. The apparatus includes a first processor for generating a Modulation Signaling Sequence (MSS) using a plurality of received sequences, and for outputting a modulated sequence by differentially modulating the MSS. The apparatus also includes a scrambler for scrambling the modulated sequence by multiplying the modulated sequence by a scrambling sequence. A second processor receives the scrambled sequence through each allocated subcarrier, converts the received sequence into a time-domain signal, and generates and transmits the preamble. | 07-30-2009 |
20090190567 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING BROADCAST SERVICE DATA IN A BROADCASTING COMMUNICATION SYSTEM, METHOD FOR CONFIGURING THE BROADCAST SERVICE DATA, AND FRAME INCLUDING THE BROADCAST SERVICE DATA - An apparatus and method for configuring a broadcast service data in a digital broadcasting communication system are provided. The method includes mapping a first zone, corresponding to broadcast service data of a first type, and a second zone, corresponding to broadcast service data of a second type, in a frame individually. Preferably, the broadcast service data included in the first zone and the second zone is sliced into sub-slices according to a different number of service slicings for each zone. | 07-30-2009 |
20090204869 | METHOD AND APPARATUS FOR CHANNEL ENCODING AND DECODING IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - An apparatus and method for encoding a channel in a communication system using a Low-Density Parity-Check (LDPC) code. The method includes determining a number of parity bits to be subjected to puncturing; dividing the parity bits at predetermined intervals, and determining a number of puncturing bits, which are subjected to puncturing within the predetermined intervals; determining positions of puncturing parity bits corresponding to the determined number of puncturing bits; and repeatedly performing puncturing on the puncturing parity bits corresponding to the determined positions at the predetermined intervals. The predetermined intervals are determined by dividing a length of parity bits by a length of one column group in a parity-check matrix. | 08-13-2009 |
20090210767 | APPARATUS AND METHOD FOR ENCODING AND DECODING CHANNEL IN A COMMUNICATION SYSTEM USING LOW-DENSITY PARITY-CHECK CODES - An apparatus and method for generating a parity-check matrix of a Low-Density Parity-Check (LDPC) code are provided. Parameters for designing the LDPC code are determined, and a first parity-check matrix of a quasi-cyclic LDPC code is formed according to the determined parameters. A second parity-check matrix is created through the elimination of a predetermined portion of a parity part in the first parity-check matrix, and a third parity-check matrix is created by rearranging the second parity-check matrix. | 08-20-2009 |
20090213853 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING A FRAME INCLUDING CONTROL INFORMATION IN A BROADCASTING SYSTEM - Apparatus and method for transmitting and receiving a frame including control information in a broadcasting system. A frame for a broadcast service is generated using an in-band signaling scheme, and includes location information of control information in a next frame and indication information indicating a change/no-change in the control information in the next frame. The new frame structure minimizes power consumption of a receiver supporting the broadcast service. | 08-27-2009 |
20090219884 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting/receiving control information in a wireless communication system are provided, in which physical layer signaling information to be transmitted in a frame is determined, a coded block is generated from signaling information having a fixed number of bits included in the physical layer signaling information, and a frame including the coded block is transmitted. The signaling information having the fixed number of bits includes information required for receiving other signaling information having a variable number of bits. | 09-03-2009 |
20090219918 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING IN-BAND SIGNALING INFORMATION IN A WIRELESS BROADCASTING SYSTEM - A method is provided for transmitting in-band signaling information in a wireless broadcasting system that transmits broadcast service data through a plurality of data Physical Layer Pipes (PLPs) constituting a frame. Non-PLP signaling information is included in a data PLP for a particular broadcast service and the data PLP is transmitted through a current frame, when no data PLP for the particular broadcast service is transmitted in at least one frame to be transmitted within a maximum schedulable period N | 09-03-2009 |
20090222706 | APPARATUS AND METHYOD FOR CHANNEL ENCODING AND DECODING IN COMMUNICATION SYSTEM USING LOW-DENISTY PARITY-CHECK CODES - An apparatus and a method for channel encoding/decoding in a communication system are provided. The apparatus and the method generate LDPC-encoded blocks with various lengths from an LDPC code with fixed length in a communication system using a Low-Density Parity-Check (LDPC) code. The apparatus and the method perform shortening using a predetermined number of shortened bits and perform LDPC encoding. The apparatus and the method apply predetermined rules according to the predetermined number of shortened bits and determine the number of bits to be punctured, and perform puncturing based on the determined number of punctured bits. | 09-03-2009 |
20090259913 | METHOD FOR ENCODING CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM USING LOW DENSITY PARITY CHECK CODE, AND METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING THE CONTROL INFORMATION - A method and apparatus for transmitting control information in a wireless communication system using a Low Density Parity Check (LDPC) code is provided. The number of LDPC blocks, through which L1 post-signaling information is to be transmitted, is determined according to the total number of bits of the L1 post-signaling information. The number of input information bits of each LDPC block is calculated when the determined number of LDPC blocks is plural. The number of puncturing bits among parity bits of each LDPC block is determined considering a modulation order. A frame including one or multiple LDPC blocks generated through the preceding steps is transmitted. | 10-15-2009 |
20090268604 | APPARATUS AND METHOD FOR REDUCING PAPR OF PREAMBLE SIGNAL IN DIGITAL BROADCASTING SYSTEM - A method and apparatus for reducing a Peak to Average Power Ratio (PAPR) in a digital broadcasting system are provided. Reserved tones are determined, and the determined reserved tones are used to transmit a signal having an impulse characteristic in locations of sub-carriers that do not collide with a pilot signal of a preamble in a frame. The signal having the impulse characteristic is transmitted through the reserved tones in a symbol interval for which the preamble is transmitted. | 10-29-2009 |
20100135422 | PREAMBLE TRANSMISSION AND RECEPTION METHOD AND APPARATUS FOR OFDM SYSTEM - A method and apparatus for transmitting and receiving a preamble having sequence information for an OFDM system is provided. The preamble transmission method includes generating a preamble block including at least one frame having a header with a known sequence and a code block containing control information and transmitting the preamble block mapped to Orthogonal Frequency Division Multiplexing (OFDM) cells by repeating in frequency axis direction. | 06-03-2010 |
20100138720 | CHANNEL-ENCODING/DECODING APPARATUS AND METHOD USING LOW-DENSITY PARITY-CHECK CODES - An encoding/decoding apparatus and method using a low-density parity-check code (LDPC code) is disclosed. Basic column group information, serving as a set of information regarding positions of rows with weight 1, is extracted from a reference column in each column group of a predetermined parity-check matrix. Column group information transforms the positions of rows with weight 1 into positions whose lengths are within a required parity length. A parity-check matrix is generated according to the generated column group information. Data is encoded or decoded based on the generated parity-check matrix. | 06-03-2010 |
20100153813 | COMMUNICATION METHOD AND APPARATUS USING LDPC CODE - An encoding method using a Low Density Parity Check (LDPC) matrix having a codeword length of N and an information word length K is provided to improve coding efficiency, and includes generating a first parity bit vector ( | 06-17-2010 |
20100158047 | URGENT PACKET TRANSMISSION/RECEPTION APPARATUS AND METHOD FOR DIGITAL BROADCAST SYSTEM - An apparatus and method for transmitting/receiving an urgent packet in a digital broadcast system is provided. A packet transmission apparatus of a digital broadcast transmitter includes a buffer which buffers broadcast packets; an urgent packet generator which generates an urgent packet having an urgent packet header indicating the urgent packet when a packet containing urgent data is detected; and a frame generator which generates a frame with the broadcast packets and inserts the urgent packet into the frame, wherein the urgent packet is substituted for one of broadcast packets in the frame. | 06-24-2010 |
20100162073 | BIT MAPPING/DEMAPPING METHOD AND APPARATUS FOR COMMUNICATION SYSTEM - An improved bit mapping method and apparatus for a communication system is provided. A bit mapping method of the present invention includes arranging coded bits in a codeword in an order of recovery capability; setting a shift region including a number of coded bits; rearranging the coded bits in the shift region by shifting the shift region by a number of bits equal to a number of bits that is indicated by a shift factor; and mapping the rearranged coded bits into a modulation symbol in an order of reliability from a lowest reliability bit position to a highest reliability bit position of the modulation symbol. | 06-24-2010 |
20100195758 | DIGITAL VIDEO BROADCASTING-CABLE SYSTEM AND METHOD FOR PROCESSING RESERVED TONE - A Digital Video Broadcasting-Cable (DVB-C) system and a processing method for reserved tones are provided. A transmitter determines a position of broadcast data and a position of reserved tones in a frame and sends a broadcast signal into which the broadcast data and the reserved tones are inserted. A receiver determines the position of reserved tones in a received broadcast signal and extracts broadcast data from the broadcast signal in consideration of the determined position of the reserved tones. The system and method may compensate for the peak power of broadcast data to be transmitted through a multi-channel bundle, by inserting reserved tones into the whole multi-channel bundle with combined channel bands. This may reduce the Peak to Average Power Ratio (PAPR) of broadcast signals in the DVB-C system and thereby improve the performance of the DVB-C system while still adopting Orthogonal Frequency Division Multiplexing (OFDM). | 08-05-2010 |
20100202390 | MOBILE BROADCAST SYSTEM FOR SUPPORTING IRREGULAR INTERVAL BROADCAST SERVICE AND IN-BAND SIGNALING METHOD AND APPARATUS THEREFOR - An in-band signaling method and apparatus of a mobile broadcast system supporting irregular interval broadcast services is provided for facilitating channel switching of a mobile device. An in-band signaling method for a mobile broadcast system according to the present invention includes generating scheduling information of Physical Layer Pipes (PLPs) transmitted at irregular intervals, the scheduling information including a next frame index and a first frame flag, inserting the scheduling information into a control information of a current frame and multiplexing broadcast service traffic of the PLPs and the control information. | 08-12-2010 |
20100202545 | Power distribution method and apparatus for OFDM system - An apparatus is capable of distributing power over a number of subcarriers in an OFDM system. The transmission power control method for an Orthogonal Frequency Division Multiplexing (OFDM) communication system according to the present invention includes measuring, at a receiver, channel coefficients of subcarriers, classifying the subcarriers into a predetermined number of groups according to sizes of channel coefficients, generating group indices, and transmitting the group indices of the subcarriers to a transmitter. A transmitter is capable of receiving the group indices of the subcarriers, determining per-group transmission powers, allocating the per-group transmission powers to the corresponding groups, distributing the per-group transmission power over subcarriers in the same level within respective groups, and transmitting signals over the subcarriers with the distributed power level. | 08-12-2010 |
20100226331 | METHOD AND APPARATUS FOR TWO-WAY BROADCASTING - A method for transmitting and receiving broadcast signals in a radio broadcasting communication system is provided together with an associated apparatus. The transmitting method includes creating a frame having a preamble slot, a data slot and a control slot, and sending the created frame. The control slot has information for assigning the data slot to one of an uplink and a downlink. The receiving method includes receiving such a frame wherein the control slot has scheduling information for each user, and extracting the data slot from the received frame by using the scheduling information in the control slot. These methods may realize an interactive broadcasting by separately employing broadcast signals for the uplink and downlink. | 09-09-2010 |
20100232544 | METHOD FOR ENCODING CONTROL INFORMATION IN A COMMUNICATION SYSTEM, AND METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING THE CONTROL INFORMATION - A method and apparatus is provided for encoding and transmitting control information in a communication system, in which a number of coded blocks for carrying the control information is determined based on a number of bits of the control information and a specific reference value. The number of information bits corresponding to the coded blocks is calculated based on the determined number of coded blocks, the number of parity bits to be punctured in the coded blocks is calculated, and a frame including at least one of the coded blocks is transmitted. | 09-16-2010 |
20110107173 | APPARATUS AND METHOD FOR GENERATING A PARITY CHECK MATRIX IN A COMMUNICATION SYSTEM USING LINEAR BLOCK CODES, AND A TRANSMISSION/RECEPTION APPARATUS AND METHOD USING THE SAME - A method and apparatus are provided for generating a parity check matrix used to generate a linear block code in a communication system. The method includes determining a basic parameter of a second parity check matrix satisfying a rule predetermined with respect to a given first parity check matrix, generating a submatrix corresponding to a parity part of the second parity check matrix, using the basic parameter; and generating a submatrix corresponding to an information word part of the second parity check matrix, using the first parity check matrix and the basic parameter. | 05-05-2011 |
20110119568 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A COMMUNICATION SYSTEM - A method is provided for transmitting data, which improves a diversity effect in a communication system. The method includes transmitting an information word including a codeword in a (k+s)-th frame, generating s groups based on parity bits obtained by encoding the information word, and transmitting the s groups in s frames preceding the (k+s)-th frame, in a distributed manner. | 05-19-2011 |
20110138262 | METHOD AND APPARATUS FOR CHANNEL ENCODING AND DECODING IN A COMMUNICATION SYSTEM USING A LOW-DENSITY PARITY CHECK CODE - A method is provided for channel encoding in a communication system using a Low-Density Parity Check (LDPC) code. The method includes grouping information bits into a plurality of groups; determining an order of the plurality of groups to be shortened, based on a ratio of a number of bits to be shortened to a number of bits to be punctured; determining a length of an information word to be obtained by shortening the plurality of groups; shortening the plurality of groups on a group basis in the determined order based on the determined length of the information word; and LDPC-encoding a shortened information word. | 06-09-2011 |
20110167464 | APPARATUS AND METHOD FOR BROADCASTING SERVICES IN DIGITAL VIDEO BROADCASTING SYSTEM - An apparatus and method for providing signaling information using inband transmission in a digital video broadcasting system where a frame for transmitting broadcasting data according to a ground-wave broadcasting service and broadcasting data according to a mobile broadcasting service is generated, and the generated frame is transmitted with an additional area for recording recognition information that indicates whether signaling information to be transmitted in the generated frame or the frame to be transmitted next time has been changed is allocated to a signaling information field of the generated frame. | 07-07-2011 |
20110276855 | METHOD AND APPARATUS FOR CHANNEL CODING AND DECODING IN A COMMUNICATION SYSTEM USING A LOW-DENSITY PARITY-CHECK CODE - A channel coding method in a communication system using a Low-Density Parity-Check (LDPC) code. The channel coding method includes determining a degree distribution for a plurality of column groups of an information part and a plurality of column groups of a parity part; determining degrees for the plurality of column groups of the information part based on the degree distribution; determining a shortening order based on the degrees for the plurality of column groups of the information part; generating a parity check matrix based on the shortening order; and performing coding using the generated parity check matrix. | 11-10-2011 |
20110299493 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA INCLUDING A PLURALITY OF DATA STREAMS IN A BROADCASTING/COMMUNICATION SYSTEM - A method of transmitting data comprising a plurality of data streams in a broadcasting system is provided. The method includes dividing a frame into a plurality of physical layer zones, allocating the plurality of data streams to the plurality of physical layer zones, allocating signaling information associated with the plurality of physical layers to at least one of the plurality of physical layer regions, and transmitting the frame to which the signaling information is allocated. | 12-08-2011 |
20120134440 | APPARATUS AND METHOD FOR ESTIMATING CHANNEL IN DIGITAL VIDEO BROADCASTING SYSTEM - A method of operation of a transmitting node in an Orthogonal Frequency Division Multiplexing (OFDM) communication system is provided. The method includes generating a frame including a plurality of physical layer zones, each of the plurality of physical layer zones applying different Fast Fourier Transform (FFT) sizes and different pilot patterns; and transmitting the frame. | 05-31-2012 |
20120151547 | METHOD AND APPARATUS FOR TRANSMITTING OR RECEIVING DATA IN BROADCAST SYSTEM - Methods and apparatus for transmitting and receiving data having a data stream in a wireless broadcast system are provided. A frame is generated. The frame includes preamble section and a data section. The data section carries the data stream. The preamble section carries signalling information. The frame is transmitted to a receiver. In generating the frame, the data section of the frame is segmented into a plurality of frequency zones, and the data stream is mapped to a frequency zone of the plurality of frequency zones. The signalling information includes segmentation information of the frequency zones. | 06-14-2012 |
20120185757 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN COMMUNICATION/BROADCASTING SYSTEM - An apparatus and method for transmitting and receiving data in a wireless communication is provided. The method includes determining a number of zero-padding bits, determining a number (N | 07-19-2012 |
20120216099 | METHOD AND APPARATUS FOR TRANSMITTING SIGNALING INFORMATION IN DIGITAL BROADCASTING SYSTEM - A method and an apparatus for are provided. In a method for transmitting signaling information in a digital broadcasting system, a transmitter transmits signaling information, and an information bit stream is received. The received information bit stream is encoded and a parity bit is added. The parity bit is punctured such that parity bits of different patterns are formed between adjacent frames. | 08-23-2012 |
20120224517 | APPARATUS AND METHOD FOR REDUCING PEAK TO AVERAGE POWER RATIO (PAPR) IN BROADCASTING COMMUNICATION SYSTEM - An apparatus and a method are provided for reducing a Peak to Average Power Ratio (PAPR) in a broadcasting communication system, which provides a broadcasting service by dividing a broadcasting band into at least two channel bands. At least one primary reservation tone is injected into broadcasting signals of each of the channel bands. An integrated broadcasting signal of the broadcasting band is generated by combining the broadcasting signals of the channel bands. At least one secondary reservation tone is injected into the integrated broadcasting signal of the broadcasting band and the integrated broadcasting signal is transmitted. | 09-06-2012 |
20120224608 | APPARATUS AND METHOD FOR PROVIDING FREQUENCY HOPPING SCHEME IN BROADCAST COMMUNICATION SYSTEM - An apparatus and a method for using a frequency hopping scheme in a broadcast communication system are provided. A method for transmitting a broadcast signal via at least two frequency bands by a transmission end device in the broadcast communication system includes determining a frequency hopping pattern for providing a broadcast service and transmitting the same; transmitting control information via a first frame after a frequency is changed according to the frequency hopping pattern; and transmitting broadcast data for the broadcast service via a frame transmitted after the first frame. | 09-06-2012 |
20120243600 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CONTROL INFORMATION IN A BROADCASTING/COMMUNICATION SYSTEM - A method and an apparatus for encoding, transmitting, and receiving signaling information in a broadcasting/communication system are provided. The method includes generating the signaling information which comprises a plurality of pieces; determining a number of coded blocks to which the signaling information is to be encoded, based on a number of bits of the signaling information and a number of encoder input information bit; segmenting each piece of the signaling information based on the number of the coded blocks; constructing input information bits of each coded block to include segmented parts of each piece of the signaling information; encoding the input information bits to each coded block; and transmitting each coded block. | 09-27-2012 |
20120254683 | APPARATUS AND METHOD FOR MAPPING AND DEMAPPING SIGNALS IN A COMMUNICATION SYSTEM USING A LOW DENSITY PARITY CHECK CODE - An apparatus and method for mapping and demapping signals in a system using a Low Density Parity Check (LDPC) code are provided. In the method, LDPC codeword bits are written column-wise and read row-wise, substreams are generated by demultiplexing the read bits using a demultiplexing scheme, and bits included in each of the substreams are mapped to symbols on a signal constellation. The demultiplexing scheme is determined corresponding to a modulation scheme used in the signal transmitter, a length of the LDPC codeword, and a number of the substreams. | 10-04-2012 |
20120290887 | APPARATUS AND METHOD FOR TRANSMITTING AND RECEIVING DATA IN COMMUNICATION SYSTEM - An apparatus and a method for transmitting and receiving a signal in a communication system are provided. The method includes checking a type of the signal to be transmitted; determining a number of puncture bits according to the type of the signal; and puncturing an encoded signal to be transmitted according to the number of puncture bits. | 11-15-2012 |
20130055051 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING INFORMATION IN A BROADCASTING/COMMUNICATION SYSTEM - A method and apparatus are provided for transmitting and receiving information in a broadcasting/communication system. The method includes comparing a number of bits of an information word to be transmitted with a predetermined threshold value; if the number of bits of the information word is less than the predetermined threshold value, determining a first parameter pair; if the number of bits of the information word is not less than the predetermined threshold value, determining a second parameter pair; determining a number of bits to be punctured based on one of the first parameter pair and the second parameter pair; and puncturing the determined number of bits to be punctured, with respect to parity bits of a codeword generated by encoding the information word. | 02-28-2013 |
20130265494 | METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF DATA STREAMS IN DIGITAL VIDEO BROADCASTING SYSTEMS - A wireless communication unit comprising a transmitter and a signal processor are provided. The signal processor is arranged to map service data onto a first set of multiple Physical Layer Pipes (PLPs), map the first set of PLPs onto a first set of logical frames, and form a first logical channel comprising the first set of logical frames. A structure of the logical frames is composed of PLPs of a plurality of different data types. | 10-10-2013 |
20130265956 | METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF DATA STREAMS IN DIGITAL VIDEO BROADCASTING SYSTEMS - A method of transmitting data in a wireless communication system is provided. The method comprises mapping service data onto a first set of multiple Physical Layer Pipes (PLPs), mapping the first set of multiple PLPs onto a first set of logical frames, wherein each of the first set of logical frames is of the same size, forming a first logical channel comprising the first set of logical frames, and transmitting the mapped service data over a target delivery system. | 10-10-2013 |
20130265957 | METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF DATA STREAMS IN DIGITAL VIDEO BROADCASTING SYSTEMS - A method for mapping of one or more logical channels onto a radio frequency channel in a communication system is provided. The method includes determining a logical channel type from a plurality of logical channel types, and mapping at least one logical frame of the determined logical channel type to at least one physical frame on at least one Radio Frequency (RF) channel based on the determined logical channel type. | 10-10-2013 |
20140286248 | METHOD AND APPARATUS FOR REDUCING PEAK-TO-AVERAGE POWER RATIO IN SINGLE CARRIER-FREQUENCY DIVISION MULTIPLE ACCESS BASED RADIO COMMUNICATION SYSTEM - A method for reducing Peak-to-Average Power Ratio (PAPR) in a Single Carrier Frequency Division Multiple Access (SC-FDMA) based radio communication system is provided. The method includes arranging symbols mapped to predetermined sub-carrier allocation types such that phases of the symbols do not overlap, and transmitting the arranged symbols. | 09-25-2014 |
20140362781 | BROADCASTING SIGNAL TRANSMITTING APPARATUS AND METHOD FOR CONTROLLING THE SAME - A broadcasting signal transmitting apparatus that transmits a plurality of signals through a plurality of antennas to increase a data transmission rate. The broadcasting signal transmitting apparatus includes a signal generator configured to generate the plurality of signals each of which includes at least one preamble symbol and data symbols, a frequency allocator configured to allocate a first subcarrier position of a whole frequency to a first preamble symbol included in a first signal among the plurality of signals and to allocate, by shifting a frequency position of the first subcarrier position by a preset interval, a second subcarrier position to a second preamble symbol included in a second signal among the plurality of signals, and a transmitter configured to transmit the plurality of signals through the plurality of antennas. The antennas respectively correspond to subcarrier positions allocated to the plurality of signals. | 12-11-2014 |
20150029962 | TRANSMITTING APPARATUS, RECEIVING APPARATUS, AND CONTROLLING METHOD THEREOF - A transmitting apparatus includes a symbol generator configured to generate a preamble symbol including signaling data and a reference signal, a frequency allocator configured to allocate first subcarriers and second subcarriers to the signaling data and the reference signal, respectively, in a frequency corresponding to the preamble symbol and map the signaling data and the reference signal to the allocated subcarriers, and a transmitter configured to transmit a signal including the preamble symbol and a data symbol, wherein the reference signal is a signal used for channel estimation or frequency offset compensation. Thus, synchronization is accurately corrected and channel estimation is achieved using the reference signal included in the preamble symbol, thereby reducing a ratio of a pilot included in a data symbol. | 01-29-2015 |
20150033279 | TRANSMITTING APPARATUS, RECEIVING APPARATUS AND CONTROL METHODS THEREOF - A transmitting apparatus is provided. The transmitting apparatus includes a frame generator configured to generate a frame by mapping data included in an input stream to at least one signal processing path, an information inserter configured to insert signaling information including a configurable field and a dynamic field into a signaling area of the frame, and a transmitter configured to transmit the frame in which the signaling information is inserted. The dynamic field selectively includes only information about a number of data blocks among information about the data mapped to the at least one signal processing path. Therefore, transmission efficiency of the transmitting apparatus is increased. | 01-29-2015 |
20150036764 | TRANSMITTER, RECEIVER, AND CONTROLLING METHODS THEREOF - A transmitter and receiver of a broadcast signal and corresponding methods are provided. The transmitter includes: a preamble symbol inserter configured to insert a preamble symbol including a synchronization part and an information part into a frame; and a transmitting unit configured to transmit the frame including the preamble symbol. The synchronization part includes a plurality of first sequences for measuring frequency offset of the preamble symbol, and the information part includes a plurality of second sequences for measuring a phase shift amount of the information part. | 02-05-2015 |
20150036765 | TRANSMITTER, RECEIVER AND CONTROLLING METHOD THEREOF - A transmitter includes: a frame generator configured to generate a frame including a frame starting symbol, at least one data symbol and a frame closing symbol; a pilot and reserved tone inserter configured to insert pilots and reserved tones in at least one of the frame starting symbol, the data symbol and the frame closing symbol such that positions of the reserved tones do not overlap positions of the pilots in the at least one of the frame starting symbol, the data symbol and the frame closing symbol; and a transmitter configured to transmit the frame in which the pilots and the reserved tones are inserted, wherein the reserved tones are not used to transmit data in the frame. | 02-05-2015 |
20150071374 | TRANSMITTER, RECEIVER, AND CONTROLLING METHOD THEREOF - A receiver of a signal frame such as T2 frame used in a DVB-T2 system is provided. The receiver includes: a receiving unit configured to receive a frame including a preamble symbol in which a pseudo random noise (PN) sequence is inserted; a PN sequence detector configured to detect the PN sequence from the received frame; a controller configured to measure a start point of the preamble symbol and frequency offset of the PN sequence inserted in the preamble symbol, based on the detected PN sequence; and a preamble symbol detector configured to detect the preamble symbol according to the measured start point of the preamble symbol and the measured frequency offset of the PN sequence. Therefore, the receiver accurately measures the start point of the preamble symbol and the frequency offset and estimates a channel based on the PN sequence inserted in the preamble symbol. | 03-12-2015 |