강우내감형 위성방송 서비스를 위한 SVC 기반의 소스-채널 결합 부호화 기법
SVC-based Joint Source-channel Coding for Rainfall-resilient Satellite Broadcasting Service
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초록
본 논문에서는 DVB-S2 위성방송 시스템의 서비스 제공 환경악화에도 불구하고 디지털 위성방송 서비스의 비디오 품질을 고품질로 유지할 수 있는 소스-채널 결합 부호화 기법을 제안한다. 특히 다양한 서비스 환경에 대해 적응적인 비디오 품질을 제공할 수 있는 최신의 계층 부호화 기법인 SVC(Scalable Video Coding) 압축 기법을 DVB-S2 시스 템의 채널 부호화 기법인 LDPC(Low Density Parity Check) 에 결합 적용함으로써 위성방송 서비스를 위한 새로운 개념의 계층화된 소스-채널 결합 부호화 기법을 개발한다. 이를 위하여 SVC 소스 부호화 기법과 DVB-S2의 표준 채 널 부호화 기법인 LDPC 기법을 결합하여 계층화된 소스-채널 결합 부호화를 수행할 수 있는 알고리듬을 개발하고 개 발된 알고리듬의 효과를 다양한 AWGN(Additive White Gaussian Noise) 채널 잡음 환경에서의 실험을 통해 검증 한다.
Abstract
In this paper, we propose a joint source-channel coding scheme that can provide and sustain high quality video service in spite of deteriorated transmission channel coditions 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. 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.
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