Method and apparatus for constellation shaping
First Claim
Patent Images
1. A system for mapping data and a control codes into symbol values comprising:
- an input configured to receive a signal;
a processor connected to the input and configured to;
analyze the signal to identify data and control codes;
translate the data into symbol values reserved for data; and
translate the control codes into symbol values reserved for control codes;
wherein the symbol values reserved for data have an average power level of zero and wherein the symbol values are selected from the set of symbol values consisting of −
9, −
7, −
5, −
3, −
1, 1, 3, 5, 7, and 9, and the processor is further configured to group the symbol values reserved for data into four dimensional symbol sets that do not include two or more symbol values selected from the group consisting of −
9 and +9.
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Abstract
A method and apparatus is disclosed for facilitating high-speed data communication. In one embodiment a receiver is configured to include error correction coding in an interleaved environment to increase data transmission rates. In one embodiment the signal mapping scheme includes constellation shaping to reduce transmit power levels. In one embodiment 8-state Ungerboeck trellis coding is implemented with 4-dimensional PAM 10 signal mapping.
51 Citations
9 Claims
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1. A system for mapping data and a control codes into symbol values comprising:
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an input configured to receive a signal; a processor connected to the input and configured to; analyze the signal to identify data and control codes; translate the data into symbol values reserved for data; and translate the control codes into symbol values reserved for control codes; wherein the symbol values reserved for data have an average power level of zero and wherein the symbol values are selected from the set of symbol values consisting of −
9, −
7, −
5, −
3, −
1, 1, 3, 5, 7, and 9, and the processor is further configured to group the symbol values reserved for data into four dimensional symbol sets that do not include two or more symbol values selected from the group consisting of −
9 and +9. - View Dependent Claims (2, 3, 4, 5)
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6. A method for shaping a constellation of symbol values for use in a communication system to create four dimensional symbol groups, the method comprising:
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defining a set of symbol that comprises the constellation, wherein the symbols have absolute values that ranges between a minimum absolute value and a maximum absolute value; defining four dimensional symbol groups from the set of symbol values to represent data, wherein the four dimensional symbol groups representing data do not comprise two or more symbol values that have a maximum absolute value; defining four dimensional symbol groups from the constellation to represent control codes, wherein the four dimensional symbol groups representing control codes include two or more symbols having maximum absolute value symbols. - View Dependent Claims (7, 8, 9)
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Specification