Signaling method having mixed-base shell map indices
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United States of America Patent
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Jul 4, 2000
Grant Date -
N/A
app pub date -
Mar 3, 1998
filing date -
Mar 3, 1997
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Abstract
A frame mapping technique that uses aspects of Minimum Modulus Conversion (MMC) and Shell Mapping (SM) to map data bits to a sequence of data symbols, or points. The apparatus includes a modulus converter acting as a Mixed Base Ring Selector (MBRS) to generate ring indices from K data bits. The MBRS is combined with a signal point selector to generate a sequence of transmitted symbols. The signal point selector may operate on modulus conversion principles, trellis coding principles, or uncoded bit mapping techniques. The apparatus and method permit the use of constellations having any integer number of points per ring, and a varying number of rings from symbol time to symbol time.
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