Soft-decision metric generation for higher order modulation

Details Soft-decision metric generation for higher order modulation Soft-decision metric generation for higher order modulation

2006-07-11

2006-07-11

Tse, Young T. (Department: 2637)

Pulse or digital communications

Systems using alternating or pulsating current

Plural channels for transmission of a single pulse train

C375S265000, C375S340000, C714S780000, C714S794000

Reexamination Certificate

active

07076000

ABSTRACT:
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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Le Goff et al., “Turbo-Codes and High Spectral Efficiency Modulation”, IEEE International Conference on Communications, 1994. ICC '94, SUPERCOMM/ICC '94, vol. 2, pp. 645-649.

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