Patent application number | Description | Published |
20100151898 | TRANSMITTER/RECEIVER FOR WIRELESS COMMUNICATION SYSTEM - A transmitter/receiver for a wireless communication system is provided. The transmitter for a wireless communication system includes: an external amplifier connected to a next stage of a power amplifier amplifying a signal to be transmitted to a required power level; a transmission selector configured to directly output the signal amplified by the power amplifier to an antenna or control the external amplifier to amplify the signal, based on a mode control signal; and a mode selector configured to compare a power level of a signal provided from a receiver with a predetermined power level to generate the mode control signal for determining whether or not to operate the external amplifier. | 06-17-2010 |
20100189200 | DECODING DEVICE AND METHOD FOR MIMO SYSTEM - The present invention relates to a decoding device and method for a MIMO system. A linear process is applied to a received signal vector by using a channel matrix estimated from the received signal vector and a poly-diagonalized matrix, and a soft decision value is acquired through a trellis decode by using the linear process result. Since the linear preprocess is performed by using the poly-diagonalized matrix, it is possible to receive a MIMO signal having good packet error rate performance and less complexity. Also, since the tail-biting trellis decoding method is used based on the poly-diagonalized matrix that is generated by poly-diagonalizing the effective channel matrix during the process for eliminating the signal interference, the soft decision value for the symbol can be generated with a simple hardwired device and less operation complexity. | 07-29-2010 |
20110069648 | DATA TRANSMISSION/RECEPTION APPARATUS AND METHOD FOR WIRELESS COMMUNICATION SYSTEM - Provided are apparatus and method for transmitting and receiving data for a wireless communication system. The method includes generating a first aggregation packet by controlling the number of preambles or by controlling a size of a packet according to a channel state of a channel formed to at least one reception terminal or according to a state of the reception terminal, and transmitting the first aggregation packet to the reception terminal. | 03-24-2011 |
20110069670 | DATA TRANSMISSION APPARATUS AND METHOD IN WIRELESS COMMUNICATION SYSTEM - A data communication method in a basic service set (BSS) of a wireless communication system using a carrier sense multiple access with collision avoidance (CSMA/CA) protocol includes: performing, by first and second nodes within the BSS, communication within a predetermined first time period; and transmitting, by a third node within the BSS, data to a fourth node within the first time period through a channel which is not used by the other nodes. | 03-24-2011 |
20110142177 | APPARATUS AND METHOD FOR COMPENSATING FOR DELAY MISMATCH BETWEEN AMPLITUDE COMPONENT SIGNAL AND PHASE COMPONENT SIGNAL - Provided are an apparatus and method for compensating for a delay mismatch between an amplitude component signal and a phase component signal. The apparatus includes an amplitude path delay obtainer configured to obtain amplitude-delay information on a delay occurring in a propagation path of an amplitude component signal, a phase path delay obtainer configured to obtain phase-delay information on a delay occurring in a propagation path of a phase component signal, a delay controller configured to calculate and output a difference between the obtained amplitude path delay and the obtained phase path delay, and a variable delayer configured to compensate for a delay by changing a delay value on the basis of the delay difference output from the delay controller. Using an asynchronous method, in which a signal obtained before and after a delay is used as the clock signal of a memory device and the clock signal of a register to find the delay, it is possible to reduce the complexity of the constitution and increase power efficiency. | 06-16-2011 |
20110150149 | APPARATUS AND METHOD FOR DETECTING PACKET END POINT IN WIRELESS COMMUNICATION SYSTEM - An apparatus for detecting a packet end point in a wireless communication system includes: a signal reception unit configured to receive a signal from an outside, convert the signal into a baseband signal, perform analog-digital conversion of the baseband signal, and perform a digital front end; a storage unit configured to store an output of the signal reception unit; a frequency offset estimation unit configured to estimate a frequency offset using the output of the storage unit; a frequency offset correction unit configured to compensate for a frequency error using the estimated frequency offset; an offset correlation unit configured to calculate correlation of the frequency offset and a cyclic prefix; an auto-correlation operation unit configured to calculate auto-correlation of the cyclic prefix; and a packet end detection unit configured to check a packet end point using the auto-correlation. | 06-23-2011 |
20120155289 | APPARATUS AND METHOD FOR LOOP-BACK IN WIRELESS COMMUNICATION SYSTEMS - Disclosed is a loop-back apparatus in wireless communication systems, including: an MAC processing unit configured to transmit a user data and a control frame when a loop-back mode is established; a loop-back unit configured to generate a response frame of a receipt for the user data and the control message transmitted from the MAC processing unit and again feedbacks the generated response frame to the MAC processing unit. | 06-21-2012 |
20120163317 | APPARATUS AND SYSTEM OF PROVIDING WIRELESS LOCAL AREA NETWORK SERVICE FOR TRANSPORT MEANS - A wireless apparatus providing wireless LAN services for a transport means is provided. The wireless apparatus includes: a transceiver established to transmit or receive a frame; and a processor functionally connected to the transceiver, wherein the processor is established to generate and process the frame for providing the wireless LAN services, the transceiver includes a plurality of remote antennas, and the plurality of remote antennas are disposed to be spaced away from each other along a moving path of the transport means. | 06-28-2012 |
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 |
Patent application number | Description | Published |
20090154427 | TRANSMITTER AND RECEIVER FOR HIGH THROUGHPUT WIRELESS COMMUNICATION SYSTEM USING MULTIPLE ANTENNA, METHOD THEREOF, AND DIGITAL INTERMEDIATE FREQUENCY TRANSMISSION SIGNAL PROCESSING METHOD FOR THE SAME - Provided are a transmitter and receiver for a high throughput wireless communication system using a multiple antenna, a method thereof, and a digital intermediate frequency (DIF) transmission signal processing method for the same. The transmitter, includes: a baseband transmitting unit for processing a transmission signal by performing a Media Access Control (MAC) protocol process on transmission data and dividing the transmission data into n band signals where n is a predetermined natural number in a physical layer process; a DIF transmitting unit for integrating transmission signals of each band transmitted from the baseband transmitting unit and outputting m channels where m is a predetermined natural number; and a Radio Frequency (RF) transmitting unit for modulating each channel signal transmitted from the DIF transmitting unit into an RF signal and emitting the signal through the multiple antenna. | 06-18-2009 |
20090156148 | LINK ADAPTATION METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM - Provided is a link adaptation method and apparatus in wireless communication system. The method, includes: amplifying a received signal; converting the amplified signal into a digital signal; calculating digital signal strength; and calculating the received signal strength based on the digital signal strength and a gain of said amplifying a received signal. | 06-18-2009 |
20090158113 | APPARATUS AND METHOD FOR ENCODING LDPC CODE USING MESSAGE PASSING ALGORITHM - Provided is an apparatus and method for encoding a Low Density Parity Check (LDPC) code using a message passing algorithm. The apparatus, includes: a parity calculating unit for operating a check node value on an input bit and a predetermined parity bit according to the message passing algorithm and calculating a parity bit; a parity correcting unit for correcting the calculated parity bit according to a parity check result of the calculated parity bit; and an output transform unit for combining the input bit and the corrected parity bit. | 06-18-2009 |
20100142663 | APPARATUS AND METHOD FOR RECEIVING SIGNAL IN WIRELESS COMMUNICATION SYSTEM USING MULTI ANTENNA - Provided are apparatus and method for receiving signals in a wireless communication system. A receiving apparatus including a plurality of variable gain amplifier units configured to respectively control the gains of radio frequency (RF) signals received respectively through a plurality of antennas, and a plurality of analog-to-digital converters configured to respectively convert the output signals of the respective variable gain amplifiers into digital signals, includes: an automatic gain controller configured to calculate the gain values of the respective gain control amplifier units by receiving the digital signals outputted from the respective analog-to-digital converters, select the minimum gain value among the calculated gain control values, and calculate the differences between the minimum gain value and the other gain values; and a noise matching amplifier configured to attenuate the digital signals outputted from the respective analog-to-digital converters according to the calculated difference values. | 06-10-2010 |
20100150257 | APPARATUS AND METHOD FOR ESTIMATING TIMING OFFSET IN A WIRELESS COMMUNICATION SYSTEM - A method for estimating timing offset in an OFDM wireless communication system using preamble and pilot includes: estimating a carrier offset by using preamble included in a currently received OFDM packet and estimating a first timing offset based on the estimated carrier offset to thereby produce a first timing offset estimation value; estimating a second timing offset to thereby produce a second timing offset estimation value by transforming the OFDM packet into signals of frequency domain and using a pilot signal of the frequency-domain signals; checking a channel condition based on packet error information of a previously received packet to thereby produce error condition information, and selecting one between the first timing offset estimation value and the second timing offset estimation value based on the error condition information; and compensating data signals for timing offset among the frequency-domain signals the based on the selected timing offset estimation value. | 06-17-2010 |