Patent application number | Description | Published |
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 |
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 |
20100150281 | APPARATUS AND METHOD FOR RECEPTION IN MULTI-INPUT MULTI-OUTPUT SYSTEM - Provided are an apparatus and method for reception in a MIMO system. An apparatus for calculating a signal weight, includes: at least two multiplexers configured to receive, a data stream corresponding to a weight inputted and multiplex the received data stream prior to output; a multiplexing control unit configured to control the outputs of the respective multiplexers and provide a clock of a predetermined rate and a clock of a double rate two times higher than the predetermined rate; a first multiplier configured to receive multiplexed data outputted from the respective multiplexers and multiply the multiplexed data; a first storage unit configured to latch the multiplication result of the first multiplier by the double-rate clock prior to output; an adder configured to add the output of the first storage unit and the output of the first multiplier; and a second storage unit configured to latch the addition. | 06-17-2010 |
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 |
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 |
20110255488 | METHOD AND APPARATUS FOR TRANSMITTING TRAINING SEQUENCE IN MULTI USER WIRELESS COMMUNICATION SYSTEM - An apparatus of transmitting a long training field includes: a station number determination unit configured to determine at least one station to be transmitted using transmission data or channel status information; a transmission stream allocation unit configured to determine the number of transmission streams for each of the least one station determined by the station number determination unit; a long training field number calculation unit configured to calculate the number of long training fields required for each of the at least one station determined by the transmission stream allocation unit and determines the least common multiple of the number of calculated long training fields of each station; and a long training field allocation unit configured to allocate the long training fields for each station to subcarriers allocated to each station to correspond to the least common multiple of the determined long training fields. | 10-20-2011 |
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 |
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 |
20120263158 | METHOD FOR TRANSMITTING CONTROL AND TRAINING SYMBOLS IN MULTI-USER WIRELESS COMMUNICATION SYSTEM - The present invention relates to a method and an apparatus for transmitting control and training symbols to improve transmission efficiency in a multi-user wireless communication system. The method for transmitting the control and training symbols in the multi-user wireless communication system according to one embodiment of the present invention comprises the steps of: determining whether a required transmission rate of each data can be satisfied through channel estimation in each of terminals when different data are simultaneously transmitted to each of the terminals; and transmitting a data frame to each of the terminals, the data frame being composed to discriminate the control and training symbols in each of the terminals using a combination of time, frequency, and code area when the required transmission rate of each data is not satisfied according to the determined result. | 10-18-2012 |
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 |
20120327982 | METHOD AND APPARATUS FOR SIGNAL DETECTION IN MULTIPLE INPUT MULTIPLE OUTPUT - Disclosed is a method for detecting a multiple input multiple output (MIMO) transmission signal. The method for detecting a signal in multiple input multiple output (MIMO) transmission includes: acquiring M receiving symbols through each of the M receive antennas; determining a plurality of M-th candidate symbols to be determined as recovery symbols of an M-th receiving symbol received through the M-th receiving antenna among the M receive antennas; grouping the plurality of candidate symbols into N groups; and determining a plurality of M−1-th candidate symbols to be determined as recovery symbols of an M−1-th receiving symbol received through an M−1-th receive antenna for each of the N groups. | 12-27-2012 |