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Multidimensional Geometric Shaping for QAM Constellations
2017 European Conference on Optical Communication (ECOC), 2017A novel multidimensional geometric shaping technique for QAM formats is proposed. Optimized constellations at 6 bits/4D symbol and 4 bits/8D symbol are obtained by optimized subset selection of DP-16QAM and DP-QPSK constellations, respectively.
A. I. Abd El-Rahman, J. C. Cartledge
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Constellation shaping for the Gaussian channel
Proceedings of 1995 IEEE International Symposium on Information Theory, 2002Constellation shaping is method of improving the effectiveness of digital communications over noisy, bandlimited channels. We present a new view to the problem of constellation shaping. Both a new procedure and information theoretic analysis are discussed.
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Shaping multidimensional signal spaces. II. Shell-addressed constellations
IEEE Transactions on Information Theory, 1993Summary: [Part I cf. ibid. 39, No. 6, 1799-1808 (1993; Zbl 0805.94003).] By appropriately selecting the boundary of a multidimensional signal constellation used for data transmission, the average energy of the constellation can be reduced. Reduction in the average energy (shaping gain) is obtained at the price of increasing the constellation-expansion ...
Khandani, Amir K., Kabal, Peter
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Digital modulation classification using constellation shape
Signal Processing, 2000zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Lattice Precoding for Multi-Span Constellation Shaping
2018 European Conference on Optical Communication (ECOC), 2018We introduce lattice precoding (LP) for constellation shaping, which takes kurtosis into account at multiple spans to mitigate nonlinear distortion. The proposed method achieves 0.35 b/s/Hz gain for 64QAM shaping in long-haul nonlinear fiber-optic communications.
Toshiaki Koike-Akino +3 more
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Constellation Shaping using Turbo Trellis-Coded Modulation
2012 6th International Conference on Sciences of Electronics, Technologies of Information and Telecommunications (SETIT), 2012This work presents the simulation results of the performances of Turbo Trellis-Coded Modulation (TTCM) using Constellation Shaping (CS). The proposed method consists on increasing the constellation order and selecting only the most significant constellation points in order to increase the Euclidean free distance (d f ) of the entire encoding scheme ...
Abdesselam Bassou +2 more
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Constellation Shaping by Shell Mapping
2002A technique know as shell mapping is specified in the ITU-T Recommendation V.34 [34] for constellation shaping. This method achieves higher shaping gains with comparable or less computational complexity than the methods of trellis shaping [23] and trellis precoding [18] which had been proposed by Motorola Information Systems in the committee ...
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Optimal Constellation Shaping in Optical Communication Systems
2018 20th International Conference on Transparent Optical Networks (ICTON), 2018In optical communications systems, Shannon limit can be closely approached by properly chosen constellation shaping schemes. Both probabilistic shaping (PS) and geometric shaping(GS) can be applied to M-ary quadrature amplitude modulation (QAM) to obtain the shaping gain. In this invited paper, mutual information (MI) is used as a metric to analyze the
Zhen Qu, Ivan B. Djordjevic
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Constellation shaping and LDPC codes (2017)
2018Shaping of multilevel constellations is investigated and it is shown that the performance in the waterfall region can be accurately predicted on the basis of the performance of the LDPC codes on the Binary AWGN channel. The use of punctured LDPC codes, not investigated so far in combination with shaped constellations, is checked to verify if it offers ...
Sandro Bellini, Marco Ferrari
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Next Generation FEC and Constellation shaping (2020)
2021Rapporto finale del progetto ...
Marco Ferrari +2 more
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