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학술지 Simplified Non-Square Quadrature Amplitude Modulation Demapper for DOCSIS 3.1
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저자
이제원, 정준영, 안재민
발행일
201703
출처
IEEE Transactions on Broadcasting, v.63 no.1, pp.156-161
ISSN
0018-9316
출판사
IEEE
DOI
https://dx.doi.org/10.1109/TBC.2016.2619583
협약과제
15MR3400, FTN(Faster Than Nyquist)기반 유무선 방송시스템 고도화 기술 개발, 허남호
초록
A simplified soft demapper for non-square quadrature amplitude modulation (QAM) provided by fifth generation of high-speed data-over-cable systems (DOCSIS 3.1) is proposed. By using the geometric tendency of the non-square QAM constellation and 'fold-and-overlap' approach, the non-linear log likelihood ratio (LLR) equation based on the max-log maximum a posteriori (MAP) algorithm can be approximated to linear equations. With this approximation, the proposed method can be applied to high-order non-square QAM, up to 8192 QAM, with negligible bit error rate performance degradation under additive white Gaussian noise and multipath flat-fading channels. Computational complexity is reduced by at least 93% compared to the LLR calculation based on the max-log MAP algorithm.
KSP 제안 키워드
Additive white Gaussian noise(AWGN), Bit Error Rate(And BER), Bit Error Rate performance, Computational complexity, DOCSIS 3.1, Equation based, Fifth Generation(5G), High Speed, Linear equations, MAP algorithm, Max-Log-MAP