Method and apparatus for detecting signal
AssigneeElectronics and Telecommunications Research Institute
InventorsYoung Jin Moon, Young-Il Kim, Kan Zheng, Wenbo Wang
Life of this patent
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Abstract
In a method for detecting a signal in a multi-input multi-output wireless communication system that receives signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, a detection order for detecting the transmission signals received through the reception antennas is determined on the basis of a cofactor determinant of components constituting a channel matrix representing characteristics of channels between the transmission antennas and the reception antennas. In addition, the transmission signal is detected from the signals received through the reception antennas in accordance with the determined detection order.
Claims11
A method for detecting a signal in a multi-input multi-output wireless communication system that receives signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, comprising:
- determining a detection order for detecting the transmission signals received through the reception antennas based on a cofactor determinant of components constituting a channel matrix representing characteristics of channels between the transmission antennas and the reception antennas;
- rearranging reception signal vectors representing characteristics of the signals received through the reception antennas in accordance with the determined detection order;
- detecting a transmission signal determined to be detected in accordance with the detection order by acquiring a nulling vector and applying the nulling vector to the reception signal vector;
- and
- cancelling interference in the detected transmission signal.
A method for determining a signal detection order in a multi-input multi-output wireless communication system that receives signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, comprising:
- calculating a covariance matrix for a channel matrix representing channel response characteristics between the transmission antennas and the reception antennas;
- calculating cofactor determinants of all components in a row of the covariance matrix;
- and
- selecting a component having a minimum cofactor determinant among all components based on the calculated cofactor determinants and determining the component as a detection target for the row,
- wherein the calculating a cofactor determinant and the determining the component as the detection target are repeatedly performed for all the rows of the covariance matrix of the channel matrix, such that the detection order is determined by determining a component selected for each row as a detection target in sequence.
An apparatus for detecting a signal in a multi-input multi-output wireless communication system that receives signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, comprising:
- a detection ordering determination unit determining a detection order for detecting the transmission signals received through the reception antennas based on cofactor determinants of components constituting a channel matrix representing characteristics of channels between the transmission antennas and the reception antennas;
- a signal detection unit detecting the transmission signal determined to be detected in accordance with the detection order from reception signal vectors representing characteristics of the signals received through the reception antennas in accordance with the determined detection order;
- a hard-decision symbol extraction unit calculating a hard-decision value on the basis of a log likelihood ratio for the received signals;
- and
- an interference cancellation unit cancelling interference from the detected transmission signal on the basis of the hard-decision value and an interference cancellation factor acquired by using a signal-to-noise ratio.
Dependencies are inferred from the claim text.