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The fifth telecommunication generation (5G) New Radio (NR) demands excellent modulation to enhance spectral efficiency, where symbol-to-bit mapping rule in constellation diagram must be seriously considered. 5G NR uses Gray modulation that requires high performance coding, where computational complexity is usually high. This Paper proposes new 5G NR non-Gray modulation having capability of iterative decoding such that simple decoding can be applied. The iterations between demapper and decoder are utilized to update Log Likelihood Ratio (LLR) value of each transmitted bit to minimize error, where non-Gray modulation has better performance compared to Gray modulation. We propose new non-Gray modulation using Extrinsic Information Transfer (EXIT) chart to design matching between modulation and coding. We evaluate them using a series of computer simulations and design a mapper that matches the simplest decoding scheme, i.e., repetition codes. The results are expected to be better than the original 5G NR modulations.

EXIT Analysis for 5G NR Demapper and Further Enhancements