Analysis and Evaluation of Adaptive LDPC AL-FEC Codes for Content Download Services

作者：de Fez Ismael^*; Fraile Francisco; Belda Roman; Carlos Guerri Juan

来源：IEEE Transactions on Multimedia, 2012, 14(3): 641-650.

DOI：10.1109/TMM.2012.2190392

• Adaptive codes
• application layer-forward error correction (AL-FEC)
• file delivery over unidirectional transport (FLUTE)
• low density parity check (LDPC)

This paper proposes the use of adaptive low density parity check (LDPC) application layer-forward error correction (AL-FEC) codes for content download services over erasure channels. In adaptive LDPC codes, clients inform the content download server of the losses they are experiencing. Using this information, the server makes forward error correction (FEC) parity symbols available to the client at an optimum code rate. This paper presents an analytical model of the proposed adaptive LDPC codes. The model is validated through measurements realized with an application prototype. In addition, results show the performance of these codes in different scenarios, compared to the performance of non-adaptive AL-FEC, optimum LDPC AL-FEC codes, and an almost ideal rateless code. Adaptive LDPC AL-FEC codes achieve download times similar to almost ideal rateless codes with less coding complexity, at the expense of an interaction channel between server and clients.

• 出版日期2012-6