상세정보
학술지
Simplified Non-Square Quadrature Amplitude Modulation Demapper for DOCSIS 3.1
- 발행일
- 201703
- 출처
- IEEE Transactions on Broadcasting, v.63 no.1, pp.156-161
- ISSN
- 0018-9316
- 출판사
- IEEE
- 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