Variable Power Distribution Based JPEG2000 Image Transmission Using OFDM System

Abstract

This paper proposes a novel approach for robust transmission of JPEG2000 (JP2) images over wireless channels. It relies on using a wavelet transform that allows for a proper unequal distribution of the transmission power among JP2 coding units according to their contribution to the decoded image quality. In the proposed system, the JP2 stream is divided into a certain number of packet groups and each group is transmitted through a separate sub-channel at a different rate and power.

By using an Unequal Power Allocation (UPA) scheme and Orthogonal Frequency Division Multiplexing (OFDM) technique a transmission of JPEG2000 images over a block fading - frequency selective channel is presented. Power is assigned to each bit in the JPEG2000 bit stream using instantaneous and average channel state information based on its contribution to the decoded image quality. More over measured and compared the total power and consumed power for transmission. When the UPA scheme is used results show an improvement of up to10. 5 dB in the decoded image quality.