Coding rate adaptation for hybrid ARQ systems over time varying fading channels with partially observable state

TitleCoding rate adaptation for hybrid ARQ systems over time varying fading channels with partially observable state
Publication TypeConference Paper
Year of Publication2005
AuthorsKarmokar, A. K., and V. K. Bhargava
Conference NameCommunications, 2005. ICC 2005. 2005 IEEE International Conference on
Pagination2797 - 2801 Vol. 4
Date Publishedmay.
Keywordsautomatic repeat request, buffer delay, channel coding, coding rate adaptation, cross-layer optimization problem, fading channels, finite state Markov chain, hybrid ARQ systems, Markov processes, mobile radio, optimisation, packet errors minimization, partially observable Markov decision process, partially observable state, time varying fading channels, time-varying channels, traffic state, two policy-heuristic approach
Abstract

We present a cross-layer optimization problem where the coding rate of hybrid ARQ systems is adapted with channel, buffer, and input traffic state to minimize packet errors as well as buffer delay. Representing both the incoming traffic and the time-varying wireless channel as a finite state Markov chain, it is shown that the problem forms a partially observable Markov decision process (POMDP) problem. Since finding optimal policy is PSPACE complete, we investigate two policy-heuristic approaches for the purpose of efficient and real time solving of our formulated POMDP problem. Numerical results reveal that the performances of these two heuristic are almost same as the case when channel states are fully observable.

URLhttp://dx.doi.org/10.1109/ICC.2005.1494859
DOI10.1109/ICC.2005.1494859

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