Patent ID: 8625723
Filing Date: 2014-01-07
Classification: H04L

Abstract:
1. A method of performing demapping by a receiver in a wireless communication system, the method comprising: receiving, from a transmitter, an input signal and first information, the first information indicating whether a first modulo operation is performed on the input signal by the transmitter; performing a second modulo operation on the input signal to acquire a reception signal, when the first information indicates that the first modulo operation is performed; generating a maximum function value representing a highest probability that the reception signal corresponds to a candidate constellation point of an extended constellation; generating a log-likelihood ratio (LLR) using the generated maximum function value; generating an effective signal to interference-plus-noise ratio (SINR) by the receiver; and transmitting the effective SINR to the transmitter, wherein the effective SINR is represented by the following equation: wherein SINR