Paredes Paredes, Martha C.Fernández-Getino García, María Julia2015-06-232015-06-232013-07IEEE EUROCON’13 (2013) pp. 391-398978-1-4673-2232-4https://hdl.handle.net/10016/21178The Proceeding at: IEEE Eurocon Conference, took place at 2013, July 01-04, in Zagreb (Croacia)A main drawback of Orthogonal Frequency Division Multiplexing (OFDM) systems is that they suffer from a high Peak-to-Average Power Ratio (PAPR) at the transmitted signal. We propose three different architectures of a PAPR reduction technique combining pilot symbols with constellation extension. These architectures make use of a metric-based amplitude predistortion algorithm for the constellation extension embedded with orthogonal pilot symbols. Since neither the constellation extension nor the orthogonal pilots degrade the Bit Error Rate (BER), then the combined architectures also guarantee system performance. The three proposals outperform the previous algorithms (SAP and OPS) in terms of PAPR reduction, due to adequately joining pilots symbols with constellation extension. Moreover, the three architectures are examined from a complexity point of view, yielding a comparison in terms of computational load, what is straightforwardly related to implementation energy efficiency.8application/pdfeng© 2013 IEEEOFDMPeak power reductionConstellation extensionOrthogonal pilot sequencesconference paperTelecomunicaciones10.1109/EUROCON.2013.6625013open access391398IEEE EUROCON’13CC/0000022071