On trellis shaping for PAR reduction in OFDM systems

TitleOn trellis shaping for PAR reduction in OFDM systems
Publication TypeJournal Article
Year of Publication2007
AuthorsNguyen, T. T., and L. Lampe
JournalIEEE Transactions on Communications

The application of trellis shaping was recently proposed to reduce the peak-to-average power ratio (PAR) of orthogonal frequency division multiplexing (OFDM) signals. In this letter, we review the trellis-shaping schemes presented in the literature, and we introduce modifications such as a new decoding metric and the use of sequential decoding. We conduct comprehensive complexity and performance comparisons for the different schemes, and one interesting result of this work is that, in terms of PAR-reduction capability, trellis shaping with time-domain metrics is generally superior to trellis shaping with frequency-domain metrics. Furthermore, the proposed modifications enable trellis shaping for PAR reduction with a flexible performance-complexity tradeoff.


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