A new scheme for PAPR reduction in OFDM systems with ICI self-cancellation

Abstract

Frequency offset in orthogonal frequency division multiplexing (OFDM) systems leads to loss of orthogonality among subcarriers, so that intercarrier interference (ICI) occurs. A promising ICI self-cancellation scheme based on a data allocation of (X/sub k/, X/sub k+1/=X/sub k/) has been proposed to deal with this problem. However, this scheme degrades the performance in peak-to-average power ratio (PAPR). In this paper, to lessen this impairment, a simple data allocation of (X/sub k/, X/sub k+1/=X/sub k/*) is proposed to control both ICI and PAPR at the same time. As a result, the PAPR of an OFDM with the presented scheme is reduced by half when compared with that of ICI self-cancellation scheme. Furthermore, the average carrier-to-interference ratio (CIR) of the presented scheme is 12 dB higher than that of a normal OFDM system.