Methods and apparatuses for signaling with geometric constellations in a Rayleigh fading channel
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PA
PA Wayne
摘要
Communication systems are described that use signal constellations, which have unequally spaced (i.e. ‘geometrically’ shaped) points. In many embodiments, the communication systems use specific geometric constellations that are capacity optimized at a specific SNR, over the Rayleigh fading channel. In addition, ranges within which the constellation points of a capacity optimized constellation can be perturbed and are still likely to achieve a given percentage of the optimal capacity increase compared to a constellation that maximizes dmin, are also described. Capacity measures that are used in the selection of the location of constellation points include, but are not limited to, parallel decode (PD) capacity and joint capacity.
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Similarly, modifying k also scales the resulting maximum ranges for constellation design 32 as shown in the tables from FIGS. 94-95 as follows:
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