Patent ID: 8767888
Filing Date: 2014-07-01
Classification: H04L

Abstract:
1. A method for a square-root free 2 symbol max-log receiver comprising: i) obtaining linear transformations of a received two stream signal and a channel matrix without implementing square-root operations; ii) listing out all possibilities for a first symbol of the received two stream signal; iii) building look-up tables needed for computing first metrics associated with all possibilities for a first symbol of the two stream signal; iv) determining a second symbol of the two stream signal for each said first symbol listed out; v) evaluating said first metrics for each said first symbol and second symbol pair using said look-up tables; vi) listing out all possibilities for said second symbol; vii) building look-up tables needed for computing second metrics associated with all possibilities for a second symbol of said received two stream signal; viii) determining a first symbol for each choice of said second symbol listed out; ix) evaluating said second metrics for each said second symbol and first symbol pair using the look-up tables; x) determining an exact max-log log likelihood ratio for each coded bit using said second metrics; and xi) decoding at least one codeword in the two stream signal using the determined exact max-log log likelihood ratios for all bits.