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Communications of the ACM - Special issue on digital multimedia systems
Error control systems for digital communication and storage
Error control systems for digital communication and storage
A channel representation method for the study of hybrid retransmission-based error control
IEEE Transactions on Communications
On the effect of feedback errors in Markov models for SR ARQ packet delays
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IEEE Transactions on Wireless Communications
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IEEE Journal on Selected Areas in Communications
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IEEE Journal on Selected Areas in Communications
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Proceedings of the 9th ACM international symposium on Mobility management and wireless access
Proceedings of the 9th ACM international symposium on Mobility management and wireless access
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We present a framework, based on Markov models, for the analysis of error control techniques in video transmission over wireless channels. We focus on retransmission-based techniques, which require a feedback channel but also enable to perform adaptive error control. Traditional studies of these methodologies usually consider a uniform stream of data packets. Instead, video transmission poses the non-trivial challenge that the packets have different sizes, and, even more importantly, are incrementally encoded; thus, a carefully tailored model is required. We therefore proceed on two different sides. First, we consider a low-level description of the system, where two main inputs are combined, namely, a video packet generation process and a wireless channel model, both described by Markov Chains with a tunable number of states. Secondly, from a highlevel perspective, we represent the whole system evolution with another Markov Chain describing the error control process, which can feed the packet generation process back with retransmissions. The framework is able to evaluate hybrid automatic repeat request with selective retransmission, but can also be adapted to study pure automatic repeat request or forward error correction schemes. In this way, we are able to comparatively evaluate different solutions for video transmission, as well as to quantitatively assess their performance trends in a variety of scenarios. Thus, our framework can be used as an effective tool to understand the behavior of error control techniques applied to video transmission over wireless, and eventually identify design guidelines for such systems.