Network Coding Advantage over MDS Codes for Multimedia Transmission via Erasure Satellite Channels
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- Saxena P., Vázquez-Castro M.A. (2013) Network Coding Advantage over MDS Codes for Multimedia Transmission via Erasure Satellite Channels. In: Dhaou R., Beylot AL., Montpetit MJ., Lucani D., Mucchi L. (eds) Personal Satellite Services. PSATS 2013. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 123. Springer, Cham
In this paper, we focus on the performance analysis of packet-level Forward Error Correction (FEC) codes based on Systematic Random Linear Network Coding (SRNC) for multimedia transmission via erasure satellite channels. A performance comparison is presented against maximum distance separable (MDS) codes currently used in state-of-the-art satellite transmission air interfaces, specifically Reed Solomon (RS) codes. Firstly, a theoretical analysis is presented for which we first develop a matricial erasure channel model. The theoretical analysis shows that both the RS and SRNC have, as expected, similar error correction performance over different packet erasure lengths for commonly used size fields. Secondly, we present an on-the-fly progressive algorithm for SRNC, which takes advantage of the inherent randomness of SRNC encoding. Thirdly, a performance comparison is presented for two different satellite scenarios: 1) DVB-S2/RCS railway scenario and 2) Broadband Global Area Network (BGAN) mobile scenario. We use real channel parameters for the first scenario and channel traces of video streaming sessions for the second scenario. Our simulation results confirm that both the RS codes and SNRC have the same packet recovery capabilities. However, for low coding rates, SRNC is shown to achieve up to 71% delay gain as compared to RS codes.
KeywordsNetwork Coding Erasure Channel Forward Error Correction MDS codes
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