Patent ID: 8903025
Filing Date: 2014-12-02
Classification: H04L

Abstract:
1. A method of detecting data in a received multiple-input-multiple-output (MIMO) signal, the method comprising: receiving, via a transmission channel, a first signal (y1), a second signal (y2), and a third signal (y3) on first, second, and third spatial streams, respectively, wherein the received signals are associated with first data values (x1), second data values (x2), and third data values (x3); forming the first signal, the second signal, and the third signal into a received signal vector y; forming the first data values, the second data values, and the third data values into a vector x; receiving a channel matrix (H) representing effects of the transmission channel on the first data values, the second data values, and the third data values; performing a QR decomposition of the channel matrix, such that H=QR, wherein Q matrix is a unitary matrix and R matrix is an upper triangular matrix; transforming the received signal vector y into a rotated received signal vector z according to z=Q determining a distance value between the vector z and the vector x for each possible third data value (x3), the determining including: determining one or more log likelihood ratio (LLR) values based on the determined distance values.