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Simplified Non-Square Quadrature Amplitude Modulation Demapper for DOCSIS 3.1
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- Authors
- Jewon Lee, Joon-Young Jung, Jae Min Ahn
- Issue Date
- 2017-03
- Citation
- IEEE Transactions on Broadcasting, v.63, no.1, pp.156-161
- ISSN
- 0018-9316
- Publisher
- IEEE
- Language
- English
- Type
- Journal Article
- Abstract
- 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 Keywords
- Additive white Gaussian noise(AWGN), Bit Error Rate performance, Computational complexity, DOCSIS 3.1, Equation based, Fading Channels, Fifth-Generation(5G), High Speed, Log-likelihood ratio(LLR), MAP algorithm, Max-Log-MAP