Asian Transactions on Fundamentals of Electronics, Communication & Multimedia
Volume: 01, Issue: 05, November 2011
Unequal Error Protection for SPIHT Coded Image Transmission over Erroneous Wireless Channels
Md. Abdul Kader, Farid Ghani and R. Badlishah Ahmed
Digital Object Identifier: ATFECM-30109054
A well known image compression algorithm named Set Partitioning in Hierarchical Trees (SPIHT) is an efficient wavelet-based progressive image-compression technique, designed to minimize the mean-squared error (MSE) between the original and decoded imagery. Since wireless channels suffer from significant bit error rates, some mechanism to protect the encoded image required. Without such a mechanism, the channel bit errors will prevent accurate decoding of the image. Many error control solution have been proposed to address the problem of transmitting images over wireless channels. These error control coding (channel coding) techniques add redundancy at the source level. Asymmetric modulation method, Hierarchical Quadrature Amplitude Modulation (HQAM) provides alternative means of Unequal error protection to protect the transmitted sensitive coded bits without increasing the bandwidth. The paper proved that HQAM method can reduced sensitive bit error when using SPHIT image encoding where SPHIT has a drawbacks on error resilience. The performance of SPIHT coded image transmission is evaluated using gray test image and for different values of the modulation parameter and different values of bpp (bit-per-pixel).
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