Patent ID: 8406349
Filing Date: 2013-03-26
Classification: H04L

Abstract:
1. A receiving apparatus of an orthogonal frequency division multiplexing (OFDM) based multiple input multiple output (MIMO) system, comprising: a QR decomposing means for calculating an unitary matrix Q, an upper triangle matrix R, and a vector size for a received signal; a multiple dimension detecting means for calculating a first log likelihood ratio (LLR) for an output of the QR decomposing means through multiple dimension detection; an inverse matrix and weight calculating means for calculating an inverse matrix for the upper triangle matrix R and a weight; an interference removing means for regenerating a symbol for a demodulated data stream using the first LLR and removing interference from an output vector of the QR decomposing means using the regenerated symbol; a weight zero forcing means for performing zero forcing on the interference removed output vector from the interference removing means using the inverse matrix of the upper triangle matrix R and the weight and calculating a second LLR; a signal field detection means for receiving an output vector of the QR decomposing means and detecting a signal field from the output vector; a first decoding means for performing demodulation using the first LLR outputted from the multiple dimension detecting means; and a second decoding means for performing demodulation using the second LLR outputted from the weight zero forcing means.