Simplified Non-Square Quadrature Amplitude Modulation Demapper for DOCSIS 3.1

Lee, Jewon; Jung, Joon-Young; Ahn, Jae-Min

doi:10.1109/tbc.2016.2619583

Cited by 5 publications

(1 citation statement)

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“…This demapper decomposes the APSK into two different PAM signals which, again, is not directly applicable to 2D-NUCs. In [26] a simplified demapper was proposed for the Data Over Cable Service Interface Specification (DOCSIS) 3.1 [27] where non-square quadrature amplitude modulation schemes are used. In this case independence between several bits of the symbol is exploited to simplify the demapping process.…”

Section: Literature Review and Contributionmentioning

confidence: 99%

Low Complexity Adaptive Demapper for 2-D Non-Uniform Constellations

Barrueco

Montalbán

Angueira

et al. 2019

IEEE Trans. on Broadcast.

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In this paper, a novel demapper for two-dimensional non-uniform constellations (2D-NUC) is proposed, exploiting the characteristics of these constellations. It represents the combination of two underlying demapping techniques targeting ATSC 3.0 compliant OFDM transceiver. On the one hand, for low code rates, we define a metric to perform condensed demapping. On the other hand, for high code rates, adaptive sub-region demapping is proposed. In this work, a combination of both demapping methods is designed showing comparable performance to the classical Max-log demapper since the gap does not exceed 0.1 dB for all code rates of the ATSC 3.0 standard. Higher complexity reduction, from 79.2% to 95.4%, than state of art 2D-NUC demappers is obtained for 2D-256NUCs. These results are validated for ideal and non-ideal channel state information (CSI) over additive white noise Gaussian (AWGN) and Rayleigh independently and identically distributed (iid) channels. Results are extended to 2D-1kNUCs and 2D-4kNUCs showing demapping complexity reduction from 96% to 99.7% with a negligible impact on performance.

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Section: Literature Review and Contributionmentioning

confidence: 99%