Fractional Subblocking for Partial Transmit Sequence OFDM

Abolfazl GHASSEMI  T. Aaron GULLIVER  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.10   pp.3166-3173
Publication Date: 2008/10/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.10.3166
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Transmission Systems and Transmission Equipment for Communications
orthogonal frequency-division multiplexing (OFDM),  peak-to-average power ratio (PAPR),  partial transmit sequence (PTS),  inverse fast Fourier transform (IFFT),  decimation in frequency (DIF),  

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Partial transmit sequence (PTS) is a well known technique used to reduce the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. However, it has relatively high complexity due to the computation of multiple inverse fast Fourier transforms (IFFTs). To reduce this complexity, we use intermediate signals within a decimation in frequency (DIF) radix IFFT and propose a new PTS subblocking technique which requires the computation of only partial IFFTs. Performance results are presented which show a PAPR reduction similar to that with other techniques such as original PTS (O-PTS). Further, we show that complexity reduction can be achieved with either low or high radix IFFT algorithms.