Patent application number | Description | Published |
20080225962 | APPARATUS FOR GENERATING PRECODING MATRIX CODEBOOK FOR MIMO SYSTEM AND METHOD OF THE SAME - An apparatus for generating a precoding matrix codebook includes a matrix group generator to generate a first group of unitary matrices based on a vector-based codebook for precoding of a multiple input multiple output (MIMO) communication scheme; a matrix group extender to extend the first group of unitary matrices to generate a second group of unitary matrices; and a matrix group selector to select a group of columns corresponding to a communication rank from each of the unitary matrices that are elements of the second group so that the columns are optimized based on a distance between the columns corresponding to the communication rank. | 09-18-2008 |
20090046594 | MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION METHOD AND SYSTEM OF ENABLING THE METHOD - A Multiple-Input Multiple-Output (MIMO) communication method and system, the MIMO communication system including: a first channel quality information (CQI) receiving unit to receive first CQI from a user terminal, the first CQI associated with a beamforming vector selected by the user terminal; and a second CQI generating unit to generate second CQI by correcting the first CQI based on a transmission rank associated with a number of data streams to be transmitted. | 02-19-2009 |
20090128381 | CODEBOOK FOR MULTIPLE USER MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM AND COMMUNICATION DEVICE USING THE CODEBOOK - Disclosed are a Multiple User Multiple Input Multiple Output (MU-MIMO) codebook design method, and a communication device using the codebook. A MU-MIMO codebook design method includes analyzing beam patterns of candidate vectors included in a predetermined candidate codebook, and eliminating at least one of the candidate vectors based on the beam patterns of the candidate vectors to generate the MU-MIMO codebook for a MU-MIMO system being comprised of the remaining vectors. | 05-21-2009 |
20090323545 | MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM AND OPERATING METHOD THEREOF - A multiple input multiple output (MIMO) communication system having a terminal and a base station. The terminal may calculate channel direction information and channel quality information in a zero-forcing mode based on expected different user interference. The terminal may also calculate channel direction information and channel quality information in a per user unitary rate control (PU2RC) mode by reusing the channel direction information and the channel quality information in the zero-forcing mode. The base station may design a preceding vector based on feedback information from the terminal. | 12-31-2009 |
20100074353 | METHOD OF DESIGNING CODEBOOK FOR NETWORK MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM AND METHOD OF USING THE CODEBOOK - Provided herein is a method of designing a network codebook that may be shared by a plurality of base stations. Also provided herein is a feedback method of a terminal using the network codebook. The network codebook design method may design the network codebook by processing a pre-defined first codebook based on large scale fading of the base stations. The terminal may more effectively feed back a preferred matrix indicator with respect to the network codebook. | 03-25-2010 |
20100329371 | MULTIPLE INPUT MULTIPLE OUTPUT (MIMO) COMMUNICATION SYSTEM FOR FEEDFORWARDING INTERFERENCE VECTOR INDICATOR - Provided are a base station configured to provide an interference vector indicator to a terminal, and the terminal configured to recognize at least one remaining precoding vector using the interference vector indicator. Each of the base station and the terminal may configure a mapping table between at least one bit for the interference vector indicator indicating the at least one remaining precoding vector, and a plurality of vectors included in a codebook, based on a probability that the plurality of vectors may be included in a precoding matrix. In this instance, the base station may generate the interference vector indicator using the mapping table, and the terminal may recognize the at least one remaining precoding vector using the mapping table. The mapping table may be differently configured according to various modes. | 12-30-2010 |
20110058621 | CODEBOOK GENERATING METHOD AND APPARATUS FOR GENERATING A CODEBOOK FOR MULTI-POLARIZED MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEMS - A communication apparatus and method include: selecting, as a precoding matrix, one of pre-stored at least one matrix W | 03-10-2011 |
20110096851 | CODEBOOK GENERATING METHOD AND APPARATUS FOR GENERATING A CODEBOOK FOR MULTI-POLARIZED MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEMS - A communication apparatus and method include: selecting, as a precoding matrix, one of pre-stored at least one matrix W | 04-28-2011 |
20120001780 | CODEBOOK FOR MULTIPLE USER MULTIPLE INPUT MULTIPLE OUTPUT SYSTEM AND COMMUNICATION DEVICE USING THE CODEBOOK - Disclosed are a Multiple User Multiple Input Multiple Output (MU-MIMO) codebook design method, and a communication device using the codebook. A MU-MIMO codebook design method includes analyzing beam patterns of candidate vectors included in a predetermined candidate codebook, and eliminating at least one of the candidate vectors based on the beam patterns of the candidate vectors to generate the MU-MIMO codebook for a MU-MIMO system being comprised of the remaining vectors. | 01-05-2012 |
20120069919 | CODEBOOK GENERATING METHOD AND APPARATUS FOR GENERATING A CODEBOOK FOR MULTI-POLARIZED MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEMS - A method of generating a codebook for a multiple-input multiple-output (MIMO) system is provided. The codebook generation method includes: assigning a single-polarized precoding matrix to diagonal blocks among a plurality of blocks arranged in a block diagonal format in which a number of diagonal blocks corresponds to a number of polarization directions of transmitting antennas; and assigning a zero matrix to remaining blocks excluding the diagonal blocks. | 03-22-2012 |
20120170674 | APPARATUS AND METHOD FOR TRANSMITTING/RECEIVING DATA IN A MULTI-ANTENNA SYSTEM, AND SYSTEM USING THE SAME - A data reception apparatus and method for generating and transmitting feedback information in a multi-antenna system using grouped antennas, and a data transmission apparatus and method for transmitting a data stream of a user according to a transmission mode selected depending on the feedback information is disclosed. The reception apparatus generates feedback information depending on maximum channel quality information, an antenna group index associated with the maximum channel quality information, rank information, and remaining channel quality information associated with the rank information, and transmits the feedback information to the transmission apparatus. The transmission apparatus selects one of a multi-user mode and a single-user mode as a transmission mode depending on the feedback information and transmits a data stream of a user via multiple antenna groups or one antenna group, according to the selected transmission mode. | 07-05-2012 |
20130100996 | CODEBOOK GENERATING METHOD AND APPARATUS FOR GENERATING A CODEBOOK FOR MULTI-POLARIZED MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) SYSTEMS - A terminal and method for generating a codebook for a multiple-input multiple-output (MIMO) system is provided. The codebook generation includes: assigning a single-polarized precoding matrix to diagonal blocks among a plurality of blocks arranged in a block diagonal format in which a number of diagonal blocks corresponds to a number of polarization directions of transmitting antennas; and assigning a zero matrix to remaining blocks excluding the diagonal blocks. | 04-25-2013 |
20130223547 | METHOD OF DESIGNING CODEBOOK FOR NETWORK MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM AND METHOD OF USING THE CODEBOOK - Provided herein is a method of designing a network codebook that may be shared by a plurality of base stations. Also provided herein is a feedback method of a terminal using the network codebook. The network codebook design method may design the network codebook by processing a pre-defined first codebook based on large scale fading of the base stations. The terminal may more effectively feed back a preferred matrix indicator with respect to the network codebook. | 08-29-2013 |