ERROR RESILIENT VIDEO COMMUNICATIONS IN WIRELESS ATM

A combined source coding, channel coding, and packetization scheme is proposed for high performance video communications over wireless ATM. Three-dimensional signi cance-linked connected component analysis (3D-SLCCA) source codec signi cantly reduces error propagations while maintaining high coding e ciency. Channel coding is implemented by using Reed-Solomon codes for both within-cell and interlaced (cross-cell) forward error correction (FEC). While equal error protection (EEP) is applied for within-cell FEC, unequal error protection (UEP) is utilized for interlaced FEC. Finally,ATM cell interleaving is applied in order to spread the e ects of burst errors. Correlated Rayleigh fading channel model with Es=N0 =14dBat14km/h speed are used in the computer experiments. For the \Foreman " sequence, interlaced UEP provides 2.69 dB peak signal-to-noise ratio (PSNR) improvement over interlaced EEP with signi cantly reduced PSNR variance thus providing a more consistent visual quality. Applying within-cell FEC with interlaced UEP further increases the objective quality measured by PSNR by 1.18 dB. 1