Patent ID: 8442162
Filing Date: 2013-05-14
Classification: H04L

Abstract:
1. A method for QR-maximum likelihood detection (QR-MLD) demodulation, including the steps of: (a) determining a transmission reception mode as being one of single input—single output (SISO), single input—multiple output (SIMO), multiple input—multiple output (MIMO) or space frequency block codes (SFBC); (b) receiving symbols simultaneously via multiple streams, the simultaneously received symbols being represented by a received symbol vector y; (c) generating a channel matrix H; (d) performing QR decomposition on the channel matrix H to compute a Q matrix and an R matrix such that H=QR, the Q matrix being a unitary matrix and the R matrix being an upper triangular matrix; (e) processing the received symbol vector y by multiplying the received symbol vector y by the Hermitian Q (f) determining, for a SFBC mode determined at step (a), whether a conjugate calculation will be required and setting a conjugate flag having either a true or false value; (g) computing a first distance metric d (h) computing an estimated symbol {circumflex over (x)} (i) mapping the estimated symbol to a constellation as {circumflex over (x)} (j) computing a second distance metric d (k) computing a total distance metric d (l) calculating the soft bits.