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Registered APPARATUS AND METHOD FOR SOFT-DECISION DEMODULATING IN NON-SQUARE QUADRATURE AMPLITUDE MODULATION
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APPARATUS AND METHOD FOR SOFT-DECISION DEMODULATING IN NON-SQUARE QUADRATURE AMPLITUDE MODULATION
- Inventors
- Jung Joon Young, Lee Je Won, Choi Dong Joon, Namho Hur
- Application No.
- 15151768 (2016.05.11)
- Publication No.
- 20160337081 (2016.11.17)
- Registration No.
- 9832065 (2017.11.28)
- Country
- UNITED STATES
- Project Code
- 14MR3500, Development of the Advanced Broadcasting System based on FTN, Namho Hur
- Abstract
- Disclosed are an apparatus and a method for soft-decision demodulating in non-square quadrature amplitude modulation. The apparatus includes: a signal receiving unit receiving a quadrature amplitude modulation (QAM) modulated signal at an m modulation degree at a transmitting side; a soft-decision bit calculating unit determining a soft-decision bit value by calculating log likelihood ratios (LLRs) for m bits of the received QAM modulated signal; and a signal decoding unit restoring the received QAM modulated signal based on the determined soft-decision bit value, in which the soft-decision bit calculating unit defines a log likelihood ratio calculation equation by approximating soft-decision boundary points of constellation points for m bits of non-square QAM having odd bits, respectively.
- KSP Keywords
- Amplitude Modulation, Boundary points, Likelihood Ratio, Log-likelihood, Modulated signal, Quadrature-amplitude modulation(QAM), Signal decoding, Soft-decision, decision boundary, log likelihood ratio(LLR), signal based
- Family
| Status | Patent | Country | KIPRIS |
|---|---|---|---|
| Registered | 비정방 직교진폭변조 방식의 연판정 복조 장치 및 방법 | KOREA |