OFDM vs. Single-Carrier Modulation: A New View on the PAR Behavior

Konferenz: OFDM 2014 - 18th International OFDM Workshop 2014 (InOWo'14)
27.08. - 28.08.2014 in Essen, Deutschland

Tagungsband: Proceedings of the 18th International OFDM Workshop 2014 (InOWo’14)

Seiten: 8Sprache: EnglischTyp: PDF

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Stern, Sebastian; Fischer, Robert F. H. (Institut für Nachrichtentechnik, Universitaet Ulm, Ulm, Germany)

Since many years, the peak-to-average power ratio (PAR) behavior of single- and multi-carrier signals is controversially discussed in the literature. Thereby, the inferiority of multi-carrier transmission, in particular orthogonal frequency-division multiplexing (OFDM), was often stated. However, the generality of this assertion has to be doubted, as advanced single-carrier techniques have been ignored. In this paper, efficient approaches for the assessment of the PAR behavior for both modulation strategies are presented. In the single-carrier case, the impact of signal shaping on the constellation is assessed. On this basis, a meaningful comparison with OFDM based on identical spectral shapes is given, which enables a new point of view on the PAR performance of single- and multi-carrier schemes.