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US 9,543,982 B2Granted
Modulator and modulation method using non-uniform 16-symbol signal constellation for low-density parity check codeword having 2/15 code rate
AssigneeElectronics and Telecommunications Research Institute
InventorsSung-Ik Park, Sun-Hyoung Kwon, Jae-Young Lee, Heung-Mook Kim, Nam-Ho Hur
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Abstract
A modulator and a modulation method using a non-uniform 16-symbol signal constellation are disclosed. The modulator includes a memory and a processor. The memory receives a codeword corresponding to a low-density parity check (LDPC) code having a code rate of 2/15. The processor maps the codeword to 16 symbols of the non-uniform 16-symbol signal constellation on a 4-bit basis.
Claims4
A modulator using a non-uniform 16-symbol signal constellation, comprising:
- a memory configured to receive a codeword having a code rate of 2/15;
- and
- a processor configured to map the codeword to 16 symbols of the non-uniform 16-symbol signal constellation on a 4-bit basis,
- wherein the 16 symbols are defined as shown in the following Table:
- TABLE
- w
- Constellation
- 0
- 0.7062 + 0.7075i
- 1
- 0.7075 + 0.7062i
- 2
- 0.7072 + 0.7077i
- 3
- 0.7077 + 0.7072i
- 4
- −0.7062 + 0.7075i
- 5
- −0.7075 + 0.7062i
- 6
- −0.7072 + 0.7077i
- 7
- −0.7077 + 0.7072i
- 8
- 0.7062 − 0.7075i
- 9
- 0.7075 − 0.7062i
- 10
- 0.7072 − 0.7077i
- 11
- 0.7077 − 0.7072i
- 12
- −0.7062 − 0.7075i
- 13
- −0.7075 − 0.7062i
- 14
- −0.7072 − 0.7077i
- 15
- −0.7077 − 0.7072i.
36 more elements
Dependencies are inferred from the claim text.