2012
DOI: 10.1109/tmm.2012.2190392
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Analysis and Evaluation of Adaptive LDPC AL-FEC Codes for Content Download Services

Abstract: 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 more

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Cited by 17 publications
(26 citation statements)
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“…Therefore, an effective SNR mapping (ESM) PHY abstraction model, known as the received bit mutual information rate (RBIR) [19] technique, is used to estimate the PER statistics. In the ESM method, a block of OFDM sub-carrier SNRs, which varies due to frequency selective fading, is transformed into a single effective SNR (ESNR) value using (6).…”
Section: Phy (Link-level Abstraction) and Mac Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…Therefore, an effective SNR mapping (ESM) PHY abstraction model, known as the received bit mutual information rate (RBIR) [19] technique, is used to estimate the PER statistics. In the ESM method, a block of OFDM sub-carrier SNRs, which varies due to frequency selective fading, is transformed into a single effective SNR (ESNR) value using (6).…”
Section: Phy (Link-level Abstraction) and Mac Modelmentioning
confidence: 99%
“…This approach may result in numerous duplicate packets at each user and a significant increase in the total time required to download the desired media. Application layer forward error correction (AL-FEC) based on traditional block codes can be used in conjunction with data carousels to reduce download time as reported in [4][5][6][7]. However, traditional codes suffer from constraints such as a fixed code rate that must be defined beforehand.…”
Section: Introductionmentioning
confidence: 99%
“…Note that the measurements have been carried out using an implementation of the LDPC Staircase codes developed by the authors. According to [22] and [30], the inefficiency ratio of LDPC Staircase is approximately 1.07 for sufficiently large files and encoding rates.…”
Section: A Parameters For the Evaluationmentioning
confidence: 99%
“…Thus, the FEC protection applied to the videos with less quality will be higher than the FEC protection applied to the videos with high quality: the higher the quality of a video, the less error-protected. The idea of using different FLUTE channels with different FEC protection has been used in other solutions, such as [11], proposed by the authors of this paper.…”
Section: System Overviewmentioning
confidence: 99%
“…This alternative is similar to that explained before, but using FLUTE carousels instead of DASH repair sessions to recover the packets previously lost. This solution has been presented by the authors in different papers, such as [11], which shows that there is an optimum configuration of AL-FEC codes, depending on the channel losses and other characteristics of the files sent, that minimizes the download time of a multimedia content.…”
Section: Evaluation Of Flute/dash Trafficmentioning
confidence: 99%