Abstract-This paper proposes the use of Adaptive LDPC 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 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. Additionally, results show the performance of these codes in different scenarios, compared to the performance of nonadaptive 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.
De Fez Lava, I.; Fraile Gil, F.; Belda Ortega, R.; Guerri Cebollada, JC. (2012). Performance evaluation of AL-FEC LDPC codes for push content applications in wireless unidirectional environments. Multimedia Tools and Applications. 60(3):669-688. doi:10.1007/s11042-011-0841-y. that depends on the packet loss rate.
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