Patent Document ID: 9929884
Application ID: 15251654
Patent Status: 1

Claim One:
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) from first, second, and third antennas, 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; estimating 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 that includes non-zero elements above a diagonal of the R matrix; transforming the received signal vector y into a rotated signal vector z according to z=Q H y; transforming the R matrix and the rotated signal vector z by steps including setting a first matrix element from among the above-diagonal non-zero elements to zero, adjusting a second matrix element from among the above-diagonal non-zero elements, and adjusting an element of the vector z; calculating distance values using the transformed vector z and the vector x; and calculating one or more log likelihood ratio (LLR) values based on the distance values.