SYSTEM AND METHOD FOR PERFORMING MLD PREPROCESSING IN A MIMO DECODER

A method and system for performing Maximum Likelihood Detector (MLD) preprocessing in a Multiple-Input Multiple-Output (MIMO) communication system, the method including, obtaining a received signal Y a corresponding channel matrix H and a vector of noise samples n; calculating a whitening filter L-H; whitening a channel matrix H; selecting one of a first calculation or a second calculation, based on estimated complexity of the calculations; and performing preprocessing of the received signal using the selected calculation. The first calculation includes: whitening the received signal and performing a Cordic based QR decomposition to the whitened channel matrix H̃ and the whitened received signal Ỹ to obtain triangular matrix R and Y‾‾=QHL−HY. The second calculation includes: performing a Cordic based QR decomposition to the whitened channel matrix H̃ and the whitening filter L-H to obtain triangular matrix R and QHL-H, and multiplying the received signal Y by QHL-H to obtain Y‾‾=QHL−HY.