비정방 직교진폭변조에서 연판정 복조 방법
정준영, 이제원, 최동준, 허남호
- 9832065 (2017.11.28)
14MR3500, FTN(Faster Than Nyquist)기반 유무선 방송시스템 고도화 기술 개발,
- 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 제안 키워드
- 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