Pro le Optimal 8 - QAM and 32 - QAM Constellations
نویسندگان
چکیده
For low-rate trellis codes that do not utilize uncoded bits, a new approach to constellation labeling which maximizes the constellation edge proole can provide improved metrics. We investigate the edge proole optimality for 8-QAM and 32-QAM constellations. The labeling structures that achieve the optimal edge prooles for 8-QAM and 32-QAM are presented. Explicit proofs of the optimal edge prooles for each case are demonstrated. Also several other quasi-Gray labelings for 32-QAM that are not proole optimal are given.
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