C2. Progressive Image Transmission over OFDM System with Minimum Peak-to-Average Power Ratio (PAPR)

A modified Orthogonal Frequency Division MuItiplexing (OFDM) system for robust progressive image transmission is proposed in this paper. A joint sOUfce-channel coder (JSC C ) is employed in the modified OFDM system. The set partitioning hierarchical trees (SPTHT) used as SOUfce code, and The Low-Density Parity-C heck (LDPC ) used as a channel coder. The SPTHT coder is modified to generate fOUf different groups of bit stream relative to its significances. An unequal error protection (UEP) is suggested for data groups with the LDPC coder. Also, the modified OFDM system includes an adaptive c1ipping technique as a Peak to average power ratio (PAPR) reduction technique for OFDM signal. This proposed PAPR reduction technique is based on adaptive c1ipping for the amplitude of the input signal, where each of signals related to the different fOUf groups of the modified SPTHT coder is c1ipped with a different c1ipping level according to the group sensitivity. To demonstrate the efficiency of the modified OFDM system with proposed PAPR reduction technique, the simulation resuIts are presented based on bit error rate (B ER), the Peak-signal-to-noise ratio (PSNR) and PAPR over A WGN channel. B ased on the simulation results, the proposed structure provides a significant improvement in B ER and PSNR performances and a reduction in P APR is achieved.