An efficient blind dummy zeros insertion and SLM scheme for PAPR reduction in OFDM systems

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) technique is a promising modulation scheme for high performance broadband wireless communications. This technique suffers from a major drawback which is the high Peak to Average Power Ratio (PAPR) of the output signals. In order to resolve this issue, several methods that require the transmission of explicit side information (SI) have been proposed. In this paper, we propose two robust blind techniques that offer the possibility to avoid the transmission of any explicit (SI). First, we investigate a new technique refered as Blind Dummy-Zero-Insertion (DZI) which uses an adequate embedded signaling, consisting of a special matrix mask. Second, in order to enhance the signal detection process and the PAPR gain, we combine the proposed technique with the SLM method as Combined-SLM-DZI. Both methods employ an optimized scheme, during the estimation process, based on calculating the energy of the received signal. Performance evaluation shows the advantage of the proposed methods on the PAPR reduction and also proves the perfect signal recovery at the receiver side.