Patent ID: 8774303
Filing Date: 2014-07-08
Classification: H04B,H04L

Abstract:
1. A wireless communication apparatus comprising: an orthogonal polarization antenna configured to receive at least one reference signal; a channel state estimator configured to estimate a wireless polarization channel on the basis of the reference signal; and a transmission polarization state (TPS) selector configured to select a TPS corresponding to the estimated wireless polarization channel from among a plurality of M predefined TPSs, and feed back an index into the plurality of predefined TPSs on the selected TPS, wherein a TPS comprises complex-number weights for determining sizes and phases of at least two orthogonal polarization signals, and further wherein the TPS selector selects a TPS enabling downlink transmission power or a data transmission rate to be a maximum as denoted by where m k , denotes a preferred matrix index that includes a TPS selected by a k th wireless communication apparatus, X k denotes a preferred polarization index selected by the k th wireless communication apparatus, and where an optimal TPS “p m k ” is equivalent to a vector closest to a largest singular vector “v k ” of a polarization channel matrix “H k ” being selected from the plurality of predefined TPSs.