Constellation shaping

Constellation shaping refers to the process of manipulating the arrangement of symbols in a communication system in order to optimize the transmission performance. This can involve constraining the shape of the constellation to make the channel input more Gaussian, or using various techniques such as tone reservation, interleaved OFDM, selective mapping, partial transmit sequence, tone injection, and active constellation shaping to improve the overall signal quality.From: Blind Equalization and Identification [2019], Deep Learning Techniques for OFDM Systems [2021]

Information-Theoretic Concepts for Fiber Optic Communications

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Published in Andrew Ellis, Mariia Sorokina, Optical Communication Systems, 2019

Mariia Sorokina, Metodi P. Yankov

whereXis the signaling alphabet, δ is the Dirac delta function and Pi is the weight of the i-th point in the alphabet. The PMF of XPX(X) is the set of the probabilities of occurrence Pi · When optimizing the transmission strategy, also referred to as constellation shaping, the pdf is typically optimized either in terms of the positions of the points xi in the signaling space, known as geometric shaping, or their weights, known as probabilistic shaping.

Deep Learning Techniques for OFDM Systems

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Published in IETE Journal of Research, 2021

M. Meenalakshmi, Saurabh Chaturvedi, Vivek K. Dwivedi

Various PAPR reduction techniques, system performances, and computational complexities were investigated and compared in [19]. The PAPR reduction techniques were categorized into three major groups, namely signal distortion, multiple signaling, and probabilistic and coding techniques. The signal distortion technique includes amplitude CF [20], companding, peak windowing, and peak cancellation methods. The multiple signaling and probabilistic technique comprises constrained constellation shaping, tone reservation, interleaved OFDM, selective mapping (SLM) [21], partial transmit sequence (PTS) [3], tone injection, and active constellation shaping. The coding techniques contain turbo coding, Golay sequences, and linear block coding. The PAPR reduction technique must be adopted carefully by considering various system requirements. Moreover, the criteria for the selection of PAPR reduction technique were discussed in [18].

Constellation shaping

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