Patent ID: 8520759
Filing Date: 2013-08-27
Classification: H03M,H04L

Abstract:
1. A receiving-end apparatus having a plurality of Receive (Rx) antennas in a Multiple Input Multiple Output (MIMO) wireless communication system, the apparatus comprising: a plurality of operators configured to determine soft-decision values for respective streams by performing a soft modulo operation on respective symbol values included in a received signal block multiplied by an inverse matrix, the inverse matrix comprising a product of a channel matrix and a lattice transformation matrix T; a plurality of inner decoders configured to determine Log Likelihood Ratio (LLR) values of codewords according to coding schemes for the respective streams by decoding the soft-decision values for the respective streams using a common decoding scheme; a passer configured to restore LLR values representing the codewords generated in a transmitting end from the LLR values using the lattice transformation matrix T; and a plurality of outer decoders configured to determine LLR values of Transmit (Tx) bitstreams for the respective streams by decoding the LLR values representing the codewords generated in the transmitting end for the respective streams using decoding schemes for the respective streams, wherein the passer is configured to determine a combination of original codewords constituting each of linearly summed codewords due to multiplication with the lattice transformation matrix T, and thereafter restore LLR values representing the original codewords in a bit unit.