Max-log demapper architecture design for DVB-T2 rotated QAM constellations

Jianxiao Yang 1 Meng Li 2 Min Li 3 Charbel Abdel Nour 4, 5 Catherine Douillard 4, 5 Benoit Geller 1
4 Lab-STICC_TB_CACS_IAS
Lab-STICC - Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance
Abstract : — Rotated and cyclic-Q delayed (RCQD) quadrature amplitude modulation (QAM) improve DVB-T2 system performance over highly time-frequency selective channels. However, when compared with conventional QAM demapper, the RCQD demapper requires a higher computational complexity. In this paper, a complexity-reduced max-log demapper is derived and implemented over a FPGA platform. The proposed demapper allows to find the maximum likelihood (ML) point with a search spanning only M signal constellation points and guarantees to obtain the same log-likelihood ratio (LLR) metrics as the optimum max-log soft decision demapper while spanning at most 2 M signal constellation points. The optimized hardware implementation introduces only a slight performance loss compared to the floating-point full complexity max-log performance. Index Terms — DVB-T2, Rotated and Cyclic Q Delayed (RCQD) Constellations, Log-Likelihood Ratio (LLR), Max-Log Demapper.
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Jianxiao Yang, Meng Li, Min Li, Charbel Abdel Nour, Catherine Douillard, et al.. Max-log demapper architecture design for DVB-T2 rotated QAM constellations. 2015 IEEE Workshop on Signal Processing Systems (SiPS) , 2015, Hangzhou, China. ⟨10.1109/SiPS.2015.7344998⟩. ⟨hal-01247411⟩

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