<P>A simplified soft demapper for non-square quadrature amplitude modulation (QAM) provided by fifth generation of highspeed data-over-cable systems (DOCSIS 3.1) is proposed. By using the geometric tendency of the non-square QAM constellation an...
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https://www.riss.kr/link?id=A107507221
2017
-
SCI,SCIE,SCOPUS
학술저널
156-161(6쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P>A simplified soft demapper for non-square quadrature amplitude modulation (QAM) provided by fifth generation of highspeed data-over-cable systems (DOCSIS 3.1) is proposed. By using the geometric tendency of the non-square QAM constellation an...
<P>A simplified soft demapper for non-square quadrature amplitude modulation (QAM) provided by fifth generation of highspeed 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.</P>
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