Abstract:

For efficient and robust transmission of progressive coded images under wireless fading channels, an optimal scheme based  on crosslayer unequal power allocation is proposed. Unlike previous optimal transmission schemes based on unequal power  allocation, through effective use of channel state information in physical layer, automatic repeat request (ARQ)  information in link layer and rate distortion characteristics of compression stream in application layer, the optimal  unequal power allocation policies across all three layers are calculated by numerical optimization methods based on  analytical expressions to minimize the image transmission distortion. Extensive experimental results show that not only  the high searching complexity of heuristic optimization algorithm is avoided, but also the peak signal-to-noise ratio  (PSNR) of the reconstructed image is significantly improved in the proposed scheme.