Unequal Power Allocation For Image Transmission
Keyursinh R Thakor,  Bhargav Shah,  Chintan Panchal
The rapid growth of wireless communication has resulted in a demand for robust transmission of compressed images over wireless channels. The challenge of robust transmission is to protect the compressed image data against loss in such a way so we can maximize the received image quality. Transmission of JPEG2000 images using an unequal power allocation (UPA) scheme and orthogonal frequency division multiplexing (OFDM) over AWGN channels is presented. A distortion model is provided to evaluate the contribution of each Group in the construction of the received image. The optimization algorithm assigns deferent transmission powers to groups. When CSI is available, the powers are adjusted at the transmission time to compensate for the channel fading. The optimization algorithm exploits the hierarchical structure of the JPEG2000 images and uses the distortion model along with the channel state information for allocating optimal values of power for each group to minimize the end-to-end distortion. Check for PSNR value. The PSNR value of Different image with UPA is measured and compared with the PSNR value of EPA that was initially assigned. For the purpose of simulations, the authors set the number of OFDM subcarriers to be 52, the length of the cyclic prefixes equal to 16.
Keywords- JPEG2000, Wireless Image Transmission, OFDM, Unequal Power Allocation, PSNR
Cite this Article
Keyursinh R Thakor,  Bhargav Shah,  Chintan Panchal,   "Unequal Power Allocation For Image Transmission"
, International Journal of Engineering Development and Research (IJEDR), ISSN:2321-9939, Volume.2, Issue 2, pp.2561-2565, June 2014, Available at :http://www.ijedr.org/papers/IJEDR1402202.pdf