Patent application number | Description | Published |
20090285324 | APPARATUS AND METHOD FOR SPATIAL MULTIPLEXING IN MULTI INPUT MULTI OUTPUT SYSTEM - Methods and apparatus for spatial multiplexing in a closed-loop Multi Input Multi Output (MIMO) system are provided. In a method of operating a receiver in an MIMO system, a signal transmitted by a transmitter is received. Blockwise-Orthogonalized Spatial Multiplexing (B-OSM) is performed on the received signal. Feedback information determined by performing the B-OSM on the received signal is fed back to the transmitter. | 11-19-2009 |
20100278225 | Method for determining modulation and coding scheme - There is provided a method of determining a Modulation and Coding Scheme (MCS). The method includes predicting an error rate of a symbol and determining a MCS of the symbol using the error rate. Since a MCS level is determined using an estimated error rate and user data is scheduled, multi-user diversity gain can be obtained and the transmission rate can be improved. | 11-04-2010 |
20110129028 | APPARATUS AND METHOD FOR DETERMINING MODULATION AND CODING SCHEME FOR ADAPTIVE MODULATION AND CODING SCHEME IN MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM - A method and apparatus is provided for determining a modulation and coding scheme in a Multiple Input Multiple Output system with a Maximum Likelihood Detector (MIMO-MLD), in which an upper bound and a lower bound of a Signal to Noise Ratio (SNR) for the MIMO-MLD are determined, an effective Signal to Noise Ratio (eSNR) is computed using a relation between the upper bound and the lower bound, a channel quality is estimated using the eSNR, and a modulation and coding scheme is determined using the estimated channel quality. | 06-02-2011 |
20120020200 | APPARATUS AND METHOD FOR PRECODING USING CHANNEL ORTHOGONALIZATION IN MULTI-USER MULTI-ANTENNA SYSTEM - An apparatus and method for transmitting in a multi-user multi-antenna system are provided. The apparatus includes a precoder for orthogonalizing a channel by removing a channel element of a corresponding terminal with respect to multiple terminals, for determining an effective channel of each terminal by decomposing the orthogonalized channel using Singular Value Decomposition (SVD), for determining a precoding matrix using the effective channel, and for mapping data streams of the multiple terminals to a plurality of transmit antennas using the precoding matrix, and the plurality of the transmit antennas for transmitting the data streams of the multiple terminals. Hence, it is possible to obtain an iteration algorithm performance requiring considerable computation while avoiding complexity and reducing computation. | 01-26-2012 |
20120140655 | METHOD AND APPARATUS FOR FEEDING BACK CHANNEL QUALITY INFORMATION IN MULTI-USER MULTI-INPUT MULTI-OUTPUT COMMUNICATION SYSTEM - A method for feeding back Channel Quality Information (CQI) by a terminal in a Multi-User Multi-Input Multi-Output (MU-MIMO) communication system is provided. The method includes receiving a signal from a base station, determining a lower limit of an average Signal to Interference plus Noise Ratio (SINR) for the received signal, and determining the lower limit of an average SINR as CQI, and feeding back the CQI to the base station. | 06-07-2012 |
20120189037 | RELAY AND DATA RELAY METHOD - Disclosed is a relay. The relay includes: a reception unit configured to receive signals from a transmitter; a processor configured to estimate a channel with respect to the transmitter based on a pilot signal of the transmitter among receiving signals, remove the pilot signal from among the received signals, amplify the signals without the pilot signal according to the estimated channel, and insert a pilot signal of the relay into the amplified signals; and a transmitter transmitting the signals including the pilot signal of the relay under the control of the processor. | 07-26-2012 |
20120224648 | MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM USING REGULARIZED BEAMFORMING - Provided are a beamforming vector determining method and an apparatus which may compute a normalization factor of each of a plurality of terminals by normalizing a predetermined reference value using noise power occurring in each of the terminals. A leakage channel of each of the terminals may be estimated, and a beamforming vector for each of the terminals may be determined with respect to a plurality of base stations based on the leakage channel of each of the terminals. | 09-06-2012 |
20120258723 | APPARATUS FOR TRANSMITTING AND RECEIVING SIGNALS IN MULTI-NODE SYSTEM AND METHOD THEREOF - In a multi-node system including a user equipment and a plurality of nodes connected to each other, a plurality of the nodes includes a 1 | 10-11-2012 |
20140369255 | TWO-WAY RELAY APPARATUS AND METHOD THEREOF - One or more embodiments provide an apparatus and a method to estimate channel information even when channel information is not accurately known and design a relay filter based on the estimated information in a two-way relay system where a terminal having a single antenna and a relay exist. A relay apparatus of a two-way relay system includes a receiver, a controller, and a transmitter. The receiver receives a signal from at least one terminal. The controller estimates a channel between the terminals based on the received signal, and calculates a receiver matrix and a precoder. The transmitter transmits a signal precoded by the precoder. | 12-18-2014 |