Patent ID: 8687730
Filing Date: 2014-04-01
Classification: H04L

Abstract:
1. A wireless device, comprising: a channel matrix estimating unit that estimates a channel matrix based on a radio signal from a transmitting station; a covariance matrix calculating unit that calculates a covariance matrix based on the channel matrix estimated by the channel matrix estimating unit; a first metric calculating unit that calculates a first metric based on the covariance matrix calculated by the covariance matrix calculating unit; a first determining unit that calculates a first precoding matrix common to a plurality of bands based on the first metric calculated by the first metric calculating unit; a second metric calculating unit that calculates a second metric using the first precoding matrix calculated by the first determining unit; and a second determining unit that calculates a second precoding matrix of each band based on the second metric calculated by the second metric calculating unit, wherein a precoding matrix used by the wireless device is implemented by a combination of two types of the first precoding matrix and the second precoding matrix, a number of PMI (Precoding Matrix Indicators) is more than in LTE (Lonq Term Evolution), and the number of PMIs and a number of ranks to be searched increase more than in the LTE.