Pulse or digital communications – Pulse code modulation
Patent
1998-03-03
2000-07-04
Pham, Chi H.
Pulse or digital communications
Pulse code modulation
H04B 1404
Patent
active
060849150
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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3Com Corporation
Bayard Emmanuel
Pham Chi H.
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