| 摘要 |
A method (100) for simplifying soft-decision metric decisions in a M-ary modulation system includes determining (102) a single function for a soft-decision metric for each bit in a symbol by restricting the set of all possible Gray-coded constellation points to those closest to a boundary between a bit value of 0 and 1 for each bit in the input symbol and applying a predetermined function corresponding to the range of restricted constellation points to the entire possible range of symbols. A next step includes inputting (104) a symbol having real part, x, and an imaginary part, y. A next step includes (106) setting a soft-decision metric for each bit in the symbol using the predetermined function from the determining step (102).
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