Patent ID: 8867648
Filing Date: 2014-10-21
Classification: H04B

Abstract:
1. A method of transmitting a channel state information, which is transmitted by a user equipment in a multi-antenna wireless communication system, comprising the steps of: receiving a reference signal from a base station by a preset period; calculating a desired PMI (precoding matrix index) for SU-MIMO (single user-multi input multi output) for maximizing a signal strength from the base station based on the reference signal; transmitting an information on the desired PMI for the SU-MIMO at a 1st timing point in the preset period to the base station; and transmitting an information on a desired PMI for MU-MIMO (multi user-multi input multi output) and an information on an interference PMI corresponding to the desired PMI for the MU-MIMO to the base station, wherein a subspace spanned by the desired PMI for the SU-MIMO includes a subspace spanned by the desired PMI for the MU-MIMO and wherein a beam corresponding to the interference PMI is orthogonal to a beam corresponding to the desired PMI for the MU-MIMO.