An Opportunistic STBC-OFDM Scheme with Reduced PAR in the Presence of Frequency Offset

In [(S. Diggavi et al., 2003),(S. Das et al., 2005, 2006)] opportunistic space-time block codes were presented for flat-fading channels. In this paper, we propose an opportunistic STBC-OFDM for frequency-selective channels with an unequal error protection capability making it attractive for multimedia applications. Our new scheme optimizes the tradeoff between coding gain and peak-to-average ratio while minimizing inter-carrier interference in the presence of carrier frequency offset. We show that our scheme achieves a 2 dB reduction in PAR over the conventional scheme.