| Patent application number | Description | Published |
|---|
| 20110164696 | MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM USING A CODEBOOK AND METHOD OF DESIGNING THE CODEBOOK - Provided is a multiple input multiple output (MIMO) communication system using a codebook. A transmitter and a receiver included in the MIMO communication system may generate a codebook having a different size for each eigenvector of a channel matrix or a channel covariance matrix, based on eigenvalues of the channel matrix or the channel covariance matrix. | 07-07-2011 |
| 20110170621 | CODEBOOK DESIGN METHOD FOR MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM AND METHOD FOR USING THE CODEBOOK - A multiple-input multiple-output (MIMO) communication system and method using a codebook, are provided. A transmitter and at least one receiver included in the MIMO communication system may use at least one codebook from among a plurality of codebooks. Codeword matrices included in one of the codebooks may correspond to vectors included in a block diagonal matrix, and another codebook may be configured by rotating the vectors. The codeword matrices of the remaining codebooks may include the rotated vectors and random vectors. | 07-14-2011 |
| 20110194631 | UNIFIED FEEDBACK FRAME FOR SUPPORTING A PLURALITY OF FEEDBACK MODES AND A MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEM USING THE UNIFIED FEEDBACK FRAME - Provided is a multiple-input multiple-output (MIMO) communication system that may provide a plurality of feedback modes. A receiver may feed back, to a transmitter, a base codeword indicator indicating one of base codewords included in the base codebook, a differential codeword indicator indicating one of differential codewords included in the differential codebook, and/or a correlation codeword indicator indicating one of correlation codewords included in the correlation codebook. The transmitter may generate a precoding matrix using at least one of the base codeword indicator, the differential codeword indicator, and the correlation codeword indicator. | 08-11-2011 |
| 20110268204 | MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM OF SUPPORTING SEVERAL REPORTING MODES - A plurality of reporting modes used to report feedback information is provided. A transmitter and a receiver generate and share feedback information based on a corresponding reporting mode. | 11-03-2011 |
| 20110292926 | MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM AND COMMUNICATION METHOD OF CONFIGURING CODEBOOK - A multiple input multiple output (MIMO) communication system and communication method of configuring a codebook are provided. A channel may be formed between a transmitter and a receiver, and a cross-polarization discrimination value (XPD) may be detected. The XPD may vary based on a location of the transmitter and the receiver, a mobility thereof, or a peripheral environment, among other factors. The codebook may be configured based on the XPD. | 12-01-2011 |
| 20120039369 | CODEBOOK FOR EIGHT TRANSMIT ANTENNAS AND MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM USING THE CODEBOOK - A transmitter and a receiver of a multiple input multiple output (MIMO) communication system may use two codebooks to share channel information. When the transmitter uses eight transmit antennas, two codebooks may be defined. When the receiver generates two precoding matrix indicators from two codebooks, a combination of the two precoding matrix indicators may indicate a single precoding matrix. Precoding matrix candidates may also be defined. | 02-16-2012 |
| 20120039402 | MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM USING AT LEAST TWO CODEBOOKS - An apparatus and method for a communication system including a transmitter and a receiver are provided. The method may include using a first codebook including first codewords and a second codebook including second codewords. The receiver may generate a first precoding matrix indicator corresponding to one of the first codewords and a second precoding matrix indicator corresponding to one of the second codewords. The transmitter may generate a precoding matrix based on the first precoding matrix indicator and the second precoding matrix indicator. | 02-16-2012 |
| 20120106470 | METHOD AND APPARATUS FOR FEEDBACK IN MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT (MU-MIMO) COMMUNICATION SYSTEM - Provided is a feedback method and apparatus in a multiple-input multiple-output (MIMO) communication system. A terminal may determine a preferred pre-coding matrix for a neighboring terminal, based on a reference rank determined by a base station and a preferred pre-coding matrix of the terminal. The terminal may calculate a channel quality indicator (CQI) based on the preferred precoding matrix for the neighboring terminal, and may feed the CQI back to the base station. | 05-03-2012 |
