Patent ID: 8379748
Filing Date: 2013-02-19
Classification: H04L

Abstract:
1. An apparatus for calculating a log likelihood ratio (LLR) inputted from a linear receiver into a decoder in a wireless communication system using a multi-input multi-output (MIMO) scheme, the apparatus comprising: an MIMO receiver configured to output MIMO signals, which are inputted respectively from transmission (TX) antennas into reception (RX) antennas, in such a way to divide the MIMO signals into imaginary components and real components on an RX antenna basis; a first multiplexer configured to select a predetermined normalization value corresponding to each modulation scheme; a first multiplier configured to multiply each of the output signals of the MIMO receiver by the normalization value of the first multiplexer; and an LLR extractor configured to calculate an LLR value for each of the outputs of the first multiplier by using a normalization value of a constellation corresponding to the modulation scheme of a received signal.