| 主权项 |
1. A computer implemented method for generating soft bit metrics in a telecommunications system employing modulation with differential encoding comprising the steps of:
a) identifying, from the signs of received coordinates, a subset of coordinates that significantly contribute to a logarithmic likelihood ratio (LLR) of each bit; b) determining dominant terms of the LLR; and c) outputting an indicia of the soft bit metrics; wherein the subsets so identified are represented by (x1, x2), (y1, y2), (x1,y2), and (x2, Y1), with the coordinates x1, x2, y1 and y2 corresponding to in-phase and quadrature components of two successively received symbols produced by a modulator performing the differential encoding; wherein the identification step includes comparing coordinate magnitudes within a subset to generate a magnitude of the LLR. |
