Signaling method having mixed-base shell map indices
First Claim
1. A method of mapping data bits to a sequence of signal points selected from a signal constellation wherein the points in the signal constellation are equally divided into rings, the method comprising the steps:
- segmenting a plurality of data bits into a first block and a second block;
determining a sequence of ring indices ri in response to said first block using multiple modulus conversion, wherein at least one of said ring indices has a base modulus that is a value other than a power of two;
selecting a signal point sequence in response to the sequence of ring indices ri and said second block.
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Accused Products
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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Citations
12 Claims
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1. A method of mapping data bits to a sequence of signal points selected from a signal constellation wherein the points in the signal constellation are equally divided into rings, the method comprising the steps:
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segmenting a plurality of data bits into a first block and a second block; determining a sequence of ring indices ri in response to said first block using multiple modulus conversion, wherein at least one of said ring indices has a base modulus that is a value other than a power of two; selecting a signal point sequence in response to the sequence of ring indices ri and said second block. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An apparatus for mapping data bits to a sequence of signal points selected from a signal constellation wherein the points in the signal constellation are equally divided into rings, comprising:
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a bit parser for segmenting input data bits into a first and second block; a signal point index generator for generating signal point indices in response to said first block; a multiple modulus converter for generating ring indices in response to said second block, wherein at least one base modulus is other than a power of two; signal point selection blocks for selecting points from the constellation in response to said ring indices and said signal point indices; a parallel to serial converter connected to said signal point selection blocks for converting said points to a serial output. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification