Hierarchical trellis coded modulation
AssigneeIkanos Communications, Inc.
InventorsJulien Pons, Patrick Duvaut, Oliver Moreno, Laurent Pierrugues
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Abstract
A system and method for encoding information is disclosed. In one embodiment, information is encoded using a high protection code for the least significant bit and a low protection code for the next three most significant bits. The remaining bits are uncoded. The high protection code may be a turbo code and the low protection code may be a trellis coded modulation code. In this embodiment, the collection of bits is then mapped according to a diagonally shifted QAM constellation technique.
Claims11
A system for encoding a quantity of electronic information, the system comprising:
- a high protection code encoder configured to encode a first portion of the quantity of information to produce a first coded portion of information;
- a low protection code encoder configured to encode a second portion of the quantity of information to produce a second coded portion of information such that the high protection code encoder and the low protection code encoder encode the first and second portions based on a 16-state 4D Wei code concatenated with a rate 1/2 parallel concatenated turbo code, wherein the first portion comprises a least significant bit, the second portion comprises a next three significant bits, and wherein any remaining bits are uncoded;
- and
- a modulator configured to map the first coded portion of information, the second coded portion of information, and a third portion of the quantity of information to at least one symbol.
A system for encoding a quantity of electronic information, the system comprising:
- means for encoding a first portion of the quantity of information according to a high protection code to produce a first coded portion of information;
- means for encoding a second portion of the quantity of information according to a low protection code to produce a second coded portion of information such that the means for encoding a first portion and the means for encoding a second portion encode the first and second portions based on a 16-state 4D Wei code concatenated with a rate 1/2 parallel concatenated turbo code, wherein the first portion comprises a least significant bit portion, the second portion comprises a next least significant bit portion, and wherein any remaining bits are uncoded;
- and
- means for mapping the first coded portion of information, the second coded portion of information, and a third portion of the quantity of information to at least one symbol.
Dependencies are inferred from the claim text.