Patent application number | Description | Published |
20080225895 | Apparatus and Method for Generating Signal According to Ifdma, and Apparatus for Receiving Signal - A signal generation apparatus and signal receiving apparatus according to an Interleaved Frequency Division Multiple Access scheme is provided. The signal generation apparatus generates a plurality of complex symbols by digital-modulating a plurality of data symbols, and rotates the generated plurality of complex symbols in a plurality of each different phase angles. The signal generation apparatus generates a plurality of transmission symbols by repeating a plurality of rotated complex symbols at predetermined times, and rotating the repeatedly generated plurality of transmission chips in phase angles of an orthogonal phase sequence for the respective users. When the signal receiving apparatus receives the plurality of transmission symbols generated as described above, the maximum diversity gain may be obtained. | 09-18-2008 |
20080232500 | Soft Output Sphere Decoding Method - Provided is a soft output sphere decoding method for a MIMO system. The soft output sphere decoding method includes the steps of: detecting a maximum likelihood symbol nearest to a receiving signal; calculating a lattice point nearest to the receiving signal and having a symbol bit opposite to the detected maximum likelihood symbol for all bits of the receiving signal; and calculating a ratio between a distance from the receiving signal to the detected maximum likelihood symbol and a distance from the receiving signal to the calculated lattice points for each bit. | 09-25-2008 |
20080285677 | Apparatus and Method For Transmitting Signals With Multiple Antennas - An apparatus for transmitting signals with multiple antennas is disclosed. The multiple antenna transmission apparatus performs space-time encoding or space-frequency encoding, and cyclically delays the encoded symbol with a plurality of delay-values to generate a plurality of delayed symbols. The multiple antenna transmission apparatus transmits the plurality of delayed symbols to the channel through a plurality of antennas. By changing the number of space areas for encoding and the number of delay-values for delaying, the number of antennas for the multiple antenna transmission apparatus is easily expanded. | 11-20-2008 |
20080298225 | Transmitting Apparatus for Transmitting in a Multi-Carrier System Using Multiple Antennas and Receiving Apparatus in the Same System - A transmitting apparatus and receiving apparatus of a multi-carrier system using multiple antennas is proposed. An LCF encoder of the transmitting apparatus performs a liner precoding to input signals to be transmitted to a receiving apparatus using a liner complex matrix considering the number of multiple antennas and the number of subcarriers, and a subcarrier allocator respectively allocates a subcarrier to the signals liner-precoded by the LCF encoder. A transmitter respectively transmits the signals having a subcarrier allocated by the subcarrier allocator through the multiple antennas externally. A subcarrier de-allocator of a receiving apparatus extracts a liner-precoded signal by de-allocating a subcarrier allocated to the received signal. An LCF decoder outputs a bit reliability of the received signal to the liner-precoded signal extracted from the subcarrier de-allocator considering the number m of multiple antennas and the number n of subcarriers. A performance may be improved by using space diversity due to multiple antennas and a frequency diversity due to the OFDMA system, and a complexity may be reduced and a hard decision value of a performance similar to the maximum likelihood detection may be obtained by using a lattice reduction and a 2-branch Chase decoder. | 12-04-2008 |
20090022209 | TRANSMITTING APPARATUS USING SPREAD-SPECTRUM TRANSMISSION METHOD - The present invention relates to a transmitting apparatus using a spread-spectrum transmission scheme. The transmitting apparatus includes a precoder for preceding a data signal by performing a product operation between a first matrix and a diagonal matrix. The preceding outputs a signal responding to the input data by performing a product operation between the first matrix and the diagonal matrix. Such a transmitting apparatus obtains a maximum diversity gain. | 01-22-2009 |
20090202015 | TRANSMITTER HAVING FULL-DIVERSITY AND FULL-RATE, A LINEAR SPACE-TIME CODE GENERATING METHOD FOR THE TRANSMITTER, AND A MIMO SYSTEM USING SAME - A space-time code has a codeword matrix. The codeword matrix is a square matrix with dimension equal to the number of the transmit antennas, wherein a row of the codeword matrix represents combined signals transmitted by each transmit antenna and a column of the codeword matrix represents timeslots of the number of the transmit antennas. Signals are transmitted through the rows of the number of spatial multiplexing rate, in each column of the matrix. Further, the symbols of the number of the transmit antennas are combined by way of utilizing complex weights, in each row of the matrix. With this space-time code, a delay is minimized, so that change of channels can be managed efficiently. Also, the space-time code has minimum number of data symbols, and thus its complexity is minimized. | 08-13-2009 |
20090252240 | TRANSMITTING APPARATUS AND METHOD, AND RECEIVING APPARATUS AND METHOD IN MULTPLE ANTENNA SYSTEM - Respective codewords of quantization codebooks corresponding to a number of data streams are selected based on channel information estimated by a received training symbol. A stream mode is selected among stream modes to determine a modulation method applied to each data stream. The data stream is detected by using the codeword corresponding to the quantization codebook of the data stream corresponding to the selected stream mode as a precode matrix, and the detected data stream is modulated. In this case, a receiving apparatus performs a feedback operation so that indexes of the selected stream mode and the codeword used as the precode matrix may be transmitted to the transmitting apparatus. The transmitting apparatus selects the number of transmitted data streams and the modulation method based on the transmitted index of feedback streams by the feedback operation. | 10-08-2009 |
20100118851 | APPARATUS AND METHOD FOR PROVIDING WLAN SERVICE USING MULTIPLE CHANNEL - Provided are an apparatus and method for providing a WLAN service using multiple channels. The wireless local area network (WLAN) service apparatus includes a service request receiver configured to receive service request information from a first wireless terminal accessed through a first channel, a data receiver configured to receive data from a first access point accessed through a second channel according to the service request information, a data transmitter configured to transmit the data to the first wireless terminal in a predetermined service area, and an access controller configured to control the first wireless terminal and the first access point to be accessed through different channels. | 05-13-2010 |
20100142468 | APPARATUS AND METHOD FOR SUPPORTING ACCESS IN WIRELESS COMMUNICATION SYSTEM - An apparatus and method for supporting access are provided. The method for supporting access in a wireless communication system includes: checking a plurality of stations (STA) which are to get access in a network and a plurality of access nodes of the respective STAs; determining the access priorities of the checked STAs and the priorities of the access nodes of the respective STAs; dividing a wireless resource and channel available in the network into multiple wireless resources and channels; and connecting the access nodes of the respective STAs to the multiple wireless resources and channels using a multi-channel media access control (MAC) protocol. | 06-10-2010 |
20100162074 | APPARATUS AND METHOD FOR CODING QC-LDPC CODE - A high-speed quasi-cyclic low density parity check (QC-LDPC) coding apparatus for coding inputted information into a generator matrix having a dual diagonal matrix format includes: a parity bit generation unit configured to generate an arbitrary parity bit; a temporary parity bit generation unit configured to constitute the inputted information with circulants, and shift and combine the respective circulants at each row to generate a temporary parity bit; a corrected bit generation unit configured to generate corrected bits of parity bits by using an output of the temporary parity bit generation unit; and a parity bit correction unit configured to correct the temporary parity bit by reflecting an output of the corrected bit generation unit to the output of the temporary parity bit generation unit. | 06-24-2010 |
20100177656 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING WIRELESSLY PROVIDING HIGH CAPACITY SERVICE USING MULTIPLE ACCESS LINKS - A data receiving method in a wireless LAN system using multiple channels includes: determining whether a difference value of signal levels of first and second access points is equal to or less than a preset value; transmitting an association request frame to the first and second access points according to the determination result; and receiving association response frames from the first and second access points. | 07-15-2010 |
20100266072 | METHOD AND APPARATUS FOR RECEIVING SIGNAL FOR MIMO SYSTEM - Provided is a method and apparatus for receiving a signal for a MIMO system. The receiving apparatus includes: a QR decomposer for calculating a unitary matrix Q, an upper triangle matrix R, and a vector size for a received signal; a multiple dimension detector for calculating a first LLR for an output of the QR decomposer through multiple dimension detection; an inverse matrix and weight calculator for calculating an inverse matrix for the upper triangle matrix R and a weight; an interference remover for regenerating a symbol for a demodulated data stream using the fist LLR and removing interference from an output vector of the QR decomposer using the regenerated symbol; and a weight zero forcing unit for performing zero forcing on the interference removed output vector from the interference remover using the inverse matrix of the upper triangle matrix R and the weight and calculating a second LLR. | 10-21-2010 |
20100269011 | APPARATUS AND METHOD FOR DECODING LOW DENSITY PARITY CHECK CODE USING PROTOTYPE MATRIX - Provided is an apparatus and method for decoding a low density parity check (LDPC) code using a prototype matrix. The apparatus includes: a bit input unit for receiving a log likelihood ratio (LLR) value for an input bit; a check matrix processing unit for sequentially processing a parity check matrix for the received LLR value using a prototype parity check matrix through partial-parallel processing; and a bit processing unit for restoring the input bit by determining a bit level from the partial-parallel processed parity check matrix value. | 10-21-2010 |
20110150054 | SWITCHING APPARATUS AND METHOD FOR WIRELESS COMMUNICATION SYSTEM - A switching apparatus in a wireless communication system using multi-channels includes: a first antenna unit configured to transmit and receive data of a first multi-channel among the multi-channels; a second antenna unit configured to transmit and receive data of a second multi-channel among the multi-channels; a first transceiver configured to receive the data from the first antenna unit and transmit the data to the first transceiver; and a selection unit configured to transmit an output of the second antenna unit to the first transceiver. | 06-23-2011 |
20110199971 | Packet transmission/reception method and apparatus in wireless communication system - A method for simultaneously transmitting packets having different lengths to two or more users in a wireless communication system includes: generating the packets which are to be transmitted to the respective users; and simultaneously transmitting the generated packets to the respective users. Each of the packets contains information on the position of a symbol to which a tail field of the packet belongs, and the information on the position of the symbol to which the tail field belongs includes at least one of the maximum symbol number of the packet, the symbol number of transmission data of the packet, positional information of a last aggregated MAC protocol data unit (A-MPDU) subframe, and positional information of a null delimiter. | 08-18-2011 |
20110206156 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN WIRELESS COMMUNICATION SYSTEM - A method for transmitting, by a transmitting terminal, data to a receiving terminal in a wireless communication system includes: generating a first detection field including symbols modulated by using a BPSK data tone; generating a second detection field including symbols modulated such that an even numbered subcarrier and an odd numbered subcarrier have a phase difference of 90 degrees; generating a data packet including the first detection field, the second detection field, and the data; and transmitting the data packet. | 08-25-2011 |
20110222478 | METHOD OF TRANSMITTING DATA FRAME TO MULTI-USER IN WIRELESS COMMUNICATION SYSTEMS - Provided a method for simultaneously transmitting data frames to a plurality of STAs in a multi-user based wireless communication system. The method includes: requesting sounding or feedback for the plurality of STAs by using a first control information frame containing first group information; receiving responses to the sounding or feedback request; reconfiguring the plurality of STAs composing the first group into a plurality of second groups on the basis of the responses such that the sum of maximum transport streams of the respective STAs composing one group becomes equal to or less than the maximum number of streams transmitted by an AP; transmitting a second control information frame containing second group information on the respective second groups to the plurality of STAs composing the first group; and transmitting data frames by using the second group information. | 09-15-2011 |
20110274065 | METHOD FOR TRANSMITTING FRAME TO MULTI-USER IN WIRELESS COMMUNICATION SYSTEMS USING PLURALITY SEGMENT FREQUENCY BANDS AND METHOD FOR RECEIVING THE FRAME - Provided is a method for transmitting data frames to multiple STAs in a wireless communication system which divides a frequency band into frequency band segments to allocate. The method includes: setting a group by grouping a plurality of STAs; determining whether or not to separately allocate the frequency band segments to the STAs within the group; constructing a control frame containing a segment field, based on the determination result; and transmitting the constructed control frame through a common signal, and transmitting data frames. | 11-10-2011 |
20110280168 | METHOD FOR REDUCING POWER CONSUMPTION IN WIRELESS COMMUNICATION SYSTEM - A method for reducing power consumption in a wireless communication system includes: generating a descramble initial value by using at least some bits of identification information of an STA, which is known to an AP or base station and the STA; generating a first descramble sequence by using the generated descramble initial value and comparing at least some bits of the generated first descramble sequence with at least some bits of a service field of a currently-received signal; as the comparison result, when it is determined that the destination of the currently-received signal is not set to the STA, stopping the signal reception; and as the comparison result, when it is determined that the destination of the currently-received signal is set to the STA, generating a second descramble sequence by using the descramble initial value and descrambling the currently-received signal. | 11-17-2011 |
20110283155 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN A COMMUNICATION SYSTEM - A data transmission apparatus in a wireless communication system includes: a data field generation unit configured to generate a data field for transmitting data; a signal field generation unit configured to generate a signal field for transmitting information on the data field; and a transmission unit configured to transmit a data packet containing the data field and the signal field. The signal field includes a rate bit, a reservation bit, a length bit, a parity check bit, and a tail bit, and the data transmission apparatus transmits a check bit for checking whether the signal field is normal or not through two or more bits of the bits of the signal field. | 11-17-2011 |
20120106575 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM - Disclosed is an apparatus and method for transmitting/receiving data using a low-density parity check (LDPC) coding scheme in a communication system. The method includes generating a multi-user data packet containing data to be transmitted to a plurality of users, encoding the multi-user data packet as a BCC and an LDPC code, and transmitting the encoded multi-user data packet to the plurality of users. In the method, the encoding of the multi-user data packet encodes MPDU subframes corresponding to each of the plurality of users in the multi-user data packet as the LDPC code, and calculates information on a length in LDPC encoding, corresponding to the encoding of the multi-user data packet as the LDPC code. | 05-03-2012 |
20120155424 | COMMUNICATIONS DEVICE AND METHOD IN A HIGH-CAPACITY WIRELESS COMMUNICATION SYSTEM - The present invention relate to a wireless communication system; and, more particularly, to a communicating apparatus and method in a high rate wireless communication system. | 06-21-2012 |
20120195302 | METHOD AND APPARATUS FOR TRANSCEIVING DATA IN A MIMO SYSTEM - The present invention relates to a method and apparatus for transceiving data. A method in which a transmitting terminal transmits data to a receiving terminal in a MIMO system according to one embodiment of the present invention comprises the following steps: generating a data field containing the data; generating a signal field containing information on the data field; generating a data frame containing the data field and the signal field; and transmitting the data frame to the receiving terminal. According to the present invention, an end of the frame being transmitted is accurately notified to the receiving terminal in a communication system in which the frame is transmitted using MIMO, thereby decoding the frame in a more efficient manner at the receiving terminal. | 08-02-2012 |
20120207097 | METHOD FOR TRANSMITTING DATA IN MULTI-USER WIRELESS COMMUNICATION SYSTEM - The present invention particularly relates to a method and an apparatus for improving the efficiency of data transmission in a multi-user wireless transmission system. According to one embodiment of the present invention, the method, which is a transmission method of data in a multi-user wireless communication system, comprises the steps of: estimating channel states of each terminal through sounding or feedback information received from the terminals, and selecting terminals to which individual data are to be transmitted at the same time; determining a signal to noise ratio of the selected terminals, and calculating a precoding matrix; calculating a modulation and coding scheme (MCS) of each terminal and the number of symbols of data fields in accordance with the | 08-16-2012 |
20120207236 | APPARATUS AND METHOD FOR RECEIVING DATA IN COMMUNICATION SYSTEM - Disclosed is an apparatus for receiving data in a communication system, including: a receiving unit configured to receive data transmitted from an access point (AP) by a multi-input multi-output (MIMO) scheme; a detecting unit configured to detect a data stream of the received data using an LQ decomposition scheme; a generating unit configured to generate channel information regarding the data stream; and a transmitting unit configured to feedback the channel information to the AP. | 08-16-2012 |
20120213305 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A MIMO SYSTEM - The present invention relates to a method and apparatus for transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently. | 08-23-2012 |
20120263126 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN COMMUNICATION SYSTEM - Disclosed are an apparatus and a method for transmitting/receiving data by acquiring channel information of a terminal receiving data in a communication system providing services to users through beamforming according to a multi-input multi-output (MIMO) scheme, wherein so as to acquire channel information of the terminal for transmitting/receiving data through the beamforming according to the MIMO scheme, a null data packet announcement (NDPA) frame and a null data packet (NDP) frame are transmitted to the terminal, the beamforming frame is received from the terminal as a response of the null data packet announcement frame and the null data packet frame, and the channel information of the terminal included in the beamforming frame and the indication information on which the null data packet frame included in a control information field of the beamforming frame is normally received are checked. | 10-18-2012 |
20120294390 | METHOD OF SELECTING METRICS AND RECEIVER USING THE SAME - A method and apparatus of selecting N metrics among M metrics is provided. The apparatus determines M metrics P(i), where i=1, . . . , M. Each P(i) is represented by B bits. The apparatus determines N metrics among M metrics. The complexity for configuring the circuit is decreased, and the length of the critical path is reduced. | 11-22-2012 |
20120314801 | TRANSMITTER AND METHOD FOR TRANSMITTING DATA BLOCK IN WIRELESS COMMUNICATION SYSTEM - Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: deciding the number of bits (s) and encoders (NES) to allocate to one axis of a signal constellation; encoding an information bit based on the s and the NES and generating a coded block; parsing the coded block based on the s and the NES and generating a plurality of frequency sub-blocks; and transmitting the plurality of frequency sub-blocks to a receiver. | 12-13-2012 |
20120314802 | TRANSMITTER AND METHOD FOR TRANSMITTING DATA BLOCK IN WIRELESS COMMUNICATION SYSTEM - Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: encoding an information bit and generating a block coded with an NCBPSS bit; generating two sub-blocks by parsing the coded block; and transmitting the two sub-blocks to the transmitter. By preventing the bits that are contiguous to the encoding block from having continuous identical reliabilities on a signal constellation, the deterioration of the decoding performance of the transmitter can be prevented. | 12-13-2012 |
20120320954 | METHOD FOR DETECTING MULTIPLE INPUT MULTIPLE OUTPUT SIGNAL IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS FOR THE SAME - A method for detecting a multiple input multiple output (MIMO) signal in a wireless communication system is provided. The method includes: selecting from a first antenna each of the first candidate signal constellations in which a first path metric for at least one first survivor path is minimal; acquiring at least one second survivor path based on the first candidate signal constellations; updating a second survivor path so as to remove an effect on the second survivor path due to the first candidate signal constellations; selecting from a second antenna each of the second candidate signal constellations in which a second path metric for the at least one updated second survivor path is minimal; acquiring at least one final survivor path based on the second candidate signal constellations; and acquiring a transmitting symbol among the final survivor paths. | 12-20-2012 |
20130136207 | TRANSMITTER AND METHOD FOR TRANSMITTING DATA BLOCK IN WIRELESS COMMUNICATION SYSTEM - Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: encoding an information bit and generating a block coded with an NCBPSS bit; generating two sub-blocks by parsing the coded block; and transmitting the two sub-blocks to the transmitter. By preventing the bits that are contiguous to the encoding block from having continuous identical reliabilities on a signal constellation, the deterioration of the decoding performance of the transmitter can be prevented. | 05-30-2013 |
20130177096 | METHOD AND APPARATUS FOR TRANSCEIVING DATA IN A MIMO SYSTEM - The present invention relates to a method and apparatus for transceiving data. A method in which a transmitting terminal transmits data to a receiving terminal in a MIMO system according to one embodiment of the present invention comprises the following steps: generating a data field containing the data; generating a signal field containing information on the data field; generating a data frame containing the data field and the signal field; and transmitting the data frame to the receiving terminal. According to the present invention, an end of the frame being transmitted is accurately notified to the receiving terminal in a communication system in which the frame is transmitted using MIMO, thereby decoding the frame in a more efficient manner at the receiving terminal. | 07-11-2013 |
20140037025 | TRANSMITTER AND METHOD FOR TRANSMITTING DATA BLOCK IN WIRELESS COMMUNICATION SYSTEM - Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: encoding an information bit and generating a block coded with an NCBPSS bit; generating two sub-blocks by parsing the coded block; and transmitting the two sub-blocks to the transmitter. By preventing the bits that are contiguous to the encoding block from having continuous identical reliabilities on a signal constellation, the deterioration of the decoding performance of the transmitter can be prevented. | 02-06-2014 |
20140119327 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DATA IN A MIMO SYSTEM - The present invention relates to a method and apparatus for transmitting and receiving data. A data transmission method from a sender terminal to a receiver terminal in a MIMO system using a variable frequency band according to one embodiment of the present invention comprises: repeatedly generating a signal field depending on a frequency band that is applied to the transmission of a data frame; generating a data field including the data; generating a data frame including the signal field and the data field; and transmitting the data frame to the receiver terminal. The present invention is advantageous in that a signal field which is transmitted together with the data being transmitted from the sender terminal to the receiver terminal in the MIMO system can be sent more efficiently. | 05-01-2014 |
20140219225 | TRANSMITTER AND METHOD FOR TRANSMITTING DATA BLOCK IN WIRELESS COMMUNICATION SYSTEM - Provided are a transmitter and a method for transmitting a data block in a wireless communication system. The method comprises the following steps: deciding the number of bits (s) and encoders (NES) to allocate to one axis of a signal constellation; encoding an information bit based on the s and the NES and generating a coded block; parsing the coded block based on the s and the NES and generating a plurality of frequency sub-blocks; and transmitting the plurality of frequency sub-blocks to a receiver. | 08-07-2014 |
20140314063 | METHOD AND SYSTEM FOR ESTIMATING CHANNEL BASED ON SIGNAL FIELD CHANNEL INFORMATION IN WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEM - Provided is a method of estimating a channel based on signal field channel information in a wireless local area network (WLAN) system, the method including acquiring a first complex storage value based on training field channel information, acquiring a second storage value based on the signal field channel information, setting a first signal and a second signal based on the first complex storage value and the second complex storage value, and generating an output signal based on the first signal and the second signal. | 10-23-2014 |