Rate selection for wireless multicast system adopting incremental redundancy type hybrid-ARQ

다국어 초록 (Multilingual Abstract)

We propose a rate selection method in wireless multicastsystems where an incremental redundancy type hybrid automaticrepeat request (HARQ-IR) scheme is employed under Rayleighblock-fading channels. We aim at maximizing the long-term averagetransmission rate (LATR) while the maximum number of retransmissionsis limited to L - 1 and the probability that at leastone user fails to decode a message within L (re)transmissions islimited to ϵ. We consider two user-distribution scenarios: 1) Receiversare located at the same distance from the source and 2) receiversare uniformly distributed in a circular cell. For the formerscenario, we derive two closed-form approximations for the LATR.
Among the two, the simpler one is expressed as μ-Q-1(1-0:51/U)σ/L for a large L value where U, μ, σ, Q denote the number of receivers,the ergodic capacity, and the deviation of the mutual informationfor one HARQ round, and the complementary Gaussiancumulative distribution function, respectively. We also analyze thesecond scenario using point mass approximation.We show that theHARQ-IR scheme outperforms the conventional fixed-length codingand Chase-combining type HARQ schemes in wireless multicastnetwork for both scenarios.

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