A PRACTICAL JOINT SOURCE CHANNEL CODING SCHEME FOR DIGITAL SATELLITE BROADCASTING SERVICE BASED ON SCALABLE VIDEO CODING

摘要

In this paper, we propose a joint source-channel coding scheme that can provide and sustain high quality video service in spire of deteriorated transmission channel conditions of the DVB-S2 satellite broadcasting service. Especially by combining the layered characteristics of the SVC (Scalable Video Coding) video coding and the robust channel coding capability of LDPC (Low Density Parity Check) employed for DVB-S2, a new concept of layered joint source-channel coding for digital satellite broadcasting service is developed. Rain attenuation in high frequency band like Ka-band is a major factor for lowering the link capacity in satellite broadcasting service. Therefore, it is necessary to devise a new technology to dynamically manage the rain attenuation by adopting a joint source-channel coding that can apply variable code rates for both source and channel codings. For this purpose, we develop a layered joint source-channel coding scheme combining SVC and LDPC, and prove the performance of the proposed scheme by extensive simulations where SVC coded video is transmitted over various error-prone channels with AWGN (Additive White Gaussian Noise) patterns.