Analysis of iterative receivers for clipped COFDM signaling based on soft turbo-DAR

High peak average to power ratio (PAPR) is one of the main drawback of the OFDM systems currently used in high rate communication standards. One way to reduce PAPR consists in clipping the amplitude of the OFDM signals introducing an additional noise that degrades the system performances. This paper presents in a first part, the EXIT charts analysis of an iterative reconstruction algorithm of the clipped samples in coded OFDM systems called soft turbo-DAR. This algorithm was recently presented in G Gelle et al., (2004). Moreover, after noticing that the structure of the turbo-DAR algorithm is very close to the BICM-ID receiver, we propose a new algorithm called TD-BICM which outperforms the soft turbo-DAR for E_b/N₀ > 5 dB.