Publication record · 18.cifr/2021.liao.dbicm-ldpc

Design and Analysis of Delayed Bit-Interleaved Coded Modulation with LDPC Codes

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Yihuan Liao (University of New South Wales), Min Qiu (University of New South Wales), Jinhong Yuan (University of New South Wales)

RAI18.cifr/2021.liao.dbicm-ldpc

IEEE Transactions on Communications· 2021· doi:10.1109/TCOMM.2021.3057508

This paper investigates the design and performance of delayed bit-interleaved coded modulation (DBICM) with low-density parity-check (LDPC) codes. For Gray labeled square M-ary QAM constellations, we investigate the optimal delay scheme with the largest spectrum efficiency of DBICM for a fixed maximum number of delayed time slots and a given SNR. Using two independence/equivalence properties, we efficiently optimize the delay scheme for any uniform Gray-QAM systems and enable efficient LDPC code designs via unequal error protection through bit-channel type classifications.

BICMDBICMLDPCQAMcoded modulationcapacityGray labeling

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Standard BICM leaves a capacity gap versus coded modulation because bit positions see only one effective bit-channel per symbol. DBICM closes this gap by allowing coded bits from adjacent symbols to share a QAM mapping, but the exponential delay-scheme search space was intractable before this paper's symmetry-reduction results.

Novelty

DBICM maps deliberately delayed coded bits to both I and Q components of QAM, exploiting the independence of real/imaginary capacity improvements to reduce the delay-scheme search space. A symmetry equivalence class result further collapses the optimization, enabling efficient protograph EXIT-based LDPC design with unequal error protection.

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