Performance evaluation of AL-FEC LDPC codes for push content applications in wireless unidirectional environments

Abstract

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.

Evaluation of Background Push Content Download Services to Mobile Devices Over DVB Networks

“…its download time. As explained in [7], there is an optimal code rate that minimizes the download time for clients of a file carousel. In this context, it is also important to bear in mind that different clients on a service area will experience different losses and consequently, the amount of AL-FEC parity needed should be optimized so as to minimize the average download time over all clients in a service area, instead of being optimized for the losses experienced by a client alone.…”

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

“…For this reason, the measurements apply a random transmission scheme (source and parity symbols are sent in a random order), which provides better results than a sequential scheme in the presence of burst losses [21]. In both analytical and experimental results, the measurements collect as many iterations as needed to provide a 99% confidence intervals.…”

“…This value depends on each coding and different transmissions of the same file can provide different values so, in some codes it is not possible to obtain the inefficiency ratio analytically. We have chosen the value of 1.07 according to [15] and [21].…”

Evaluation of unidirectional background push content download services for the delivery of television programs

“…However, higher order statistical properties may be relevant or not depending on the application. For instance, the variance of the burst size is very important for real time streaming applications but, as reflected in [32] and [33] the Markov model provides accurate losses patterns to model file carousel transmissions over erasure channels.…”

“…In fact, we have contributed with different proposals [32], [33] as well as with the undergoing thesis of the main author of the aforementioned research papers. Hereby, AL-FEC is regarded as a technology enabler that reduces in a drastic manner the number of carousel cycles needed to download a file.…”