Implementation of Random Intra Refresh on ISDB-T transmission with IEEE 802.22 Interference

Abstract

Video compression is essential when conforming to a finite bandwidth and storage space. It performs inter prediction wherein it removes the temporal redundancy between neighboring frames enabling higher compression rates. However, once an error occurred on a reference frame, all the subsequent dependent frames will be in error as well, making compressed videos sensitive to transmission error. In this paper, we propose a method of random intra-refresh rate (RIR) by randomly inserting intra-coded coding tree unit (CTU) to reduce error propagation and improve the robustness to transmission errors without significantly increasing the rate distortion optimization (RDO) cost. Furthermore, this study also made use of channel modeling and simulation using MATLAB and Simulink with the reference software and done by transmitting motion levels and encoding complexity 1080p resolution video over a modelled victim ISDB-T Transmission System with interferer IEEE 802.22 PHY Transmitter sweeping interferer’s power and center frequency. The proposed scheme, implemented using standard H.265 or HEVC encoder, is compared to a pure inter coding simulation with various bitrates, error rates, and refresh rates. Average PSNR improvements of 1.59 dB for 10% RIR, 2.99 dB for 25% RIR, and 4.65 dB for 50% RIR at 33% PER are measured and subjective quality improvements are observed which proves the effectiveness of the proposed scheme.