PAR reduction in OFDM via active constellation extension

By Brian Scott Krongold, Douglas L. Jones. IEEE International Conference on Acoustics, Speech, and Signal Processing, 2003

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Novel Index Modulation Techniques: A Survey (2019, methodology): “For instance, when the ACE algorithm [80] is adopted, the constellation extension strategy is correlated to the high-dimensional constellation design of IM-OFDM, which requires joint optimization in order to harvest maximum performance gain.”
Peak-To-Average Power Ratio Reduction in OFDM Systems: A Survey And Taxonomy (2013, methodology): “tion technique where the modulation constellation over active subcarriers in the OFDM data block is modified or predistorted such that the PAPR of the data block is reduced without significantly degrading the BER performance [148], [149].”
OFDM and Its Wireless Applications: A Survey (2009, background): “They include tone injection [131], tone reservation [131], [132], active set extension [133], [134], coding [135]–[138], and companding [139], [140] approaches.”
Exponential companding technique for PAPR reduction in OFDM systems (2005, methodology): “sequence (PTS) technique [6]–[10], and selective mapping (SLM) technique [11], [12], phase optimization [13], tone reservation and injection [14], [15], and nonlinear companding transform schemes [16], [17], have been proposed in literature.”
An Overview: Peak-to-Average Power Ratio Reduction Techniques for OFDM Signals (2008, methodology): “Some modifications of TI have been proposed to obtain good performance including PAPR reduction and low complexity [72].”