Patent Document ID: 7848461
Application ID: 11705800
Patent Flag: 1

Claim One:
1. An apparatus for signal reception in a communication system, the apparatus comprising: at least one receive antenna for receiving signals modulated into bit-based symbols in accordance with a given modulation type, wherein the received signals are divided into packets of predetermined symbols each; and a signal demodulator for performing bit correction with respect to the modulated symbols to detect unreliable bits satisfying a predetermined condition, wherein the signal demodulator comprises a modulation symbol estimator for estimating transmission coefficients of the received signals as a matrix H , estimating a combined variance σ 2 of noise generated from M receiving channels and a possible error in a transmission coefficient estimate of the matrix H, and estimating a vector symbol Z of the received signals using a Log-Likelihood Ratio (LLR) according to: 
 z=W † x where W=(HH † +σ 2 I) −1 H, W is a matrix of linear conversion, I is the M×M diagonal unitary matrix, (.) † is a transposition and complex conjugation sign, and (.) −1 is a matrix inversion sign.