Patent ID: 8204142
Filing Date: 2012-06-19
Classification: H04B

Abstract:
1. A precoder in a multiuser multi-antenna system, comprising: a channel checker for determining a DownLink (DL) channel condition of terminals in a service coverage area; a pre-compensator for selecting a nonlinear algorithm according to a feedback scheme of channel state information from the terminals, and for pre-compensating, for a channel distortion of signals to be sent to the terminals by applying the selected nonlinear algorithm; and an interference remover for canceling interference in a channel by multiplying the pre-compensated signals by inverse channels of the terminals, to cancel interference between the terminals, wherein the feedback scheme includes at least one of an analog feedback scheme, a channel sounding scheme and a Channel Quality Indicator (CQI) scheme, and wherein the pre-compensator selects a first nonlinear algorithm when the terminals feed back the channel state information using at least one of the analog feedback scheme and the channel sounding scheme, and selects a second nonlinear algorithm when the terminals feed back the channel state information using the CQI scheme.