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US 9,520,898 B2Granted
Modulator and modulation method using non-uniform 16-symbol signal constellation for low-density parity check codeword having 3/15 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 3/15. The processor maps the codeword to 16 symbols of the non-uniform 16-symbol signal constellation on a 4-bit basis.
Claims4
A modulator for generating a non-uniform 16-symbol constellation signal, comprising:
- a memory configured to receive a codeword corresponding to a code rate of 3/15;
- and
- a processor configured to modulate the codeword to one of 16 symbols of the non-uniform 16-symbol constellation signal on a 4-bit basis,
- wherein the 16 symbols are defined as shown in the following Table:
- TABLE
- w
- Constellation
- 0
- 0.3620 + 0.5534i
- 1
- 0.5534 + 0.3620i
- 2
- 0.5940 + 1.1000i
- 3
- 1.1000 + 0.5940i
- 4
- −0.3620 + 0.5534i
- 5
- −0.5534 + 0.3620i
- 6
- −0.5940 + 1.1000i
- 7
- −1.1000 + 0.5940i
- 8
- 0.3620 − 0.5534i
- 9
- 0.5534 − 0.3620i
- 10
- 0.5940 − 1.1000i
- 11
- 1.1000 − 0.5940i
- 12
- −0.3620 − 0.5534i
- 13
- −0.5534 − 0.3620i
- 14
- −0.5940 − 1.1000i
- 15
- −1.1000 − 0.5940i.
36 more elements
Dependencies are inferred from the claim text.