SIMULATION OF ARQ AND HARQ SCHEMES WITH VARIOUS BLOCK LENGTH

Kvetoslava Kotuliaková - Vladimír Hájovský - Ivan Kotuliak

   Presented paper describes and analyses HARQ (Hybrid Automatic Repeat Request) and pure ARQ schemes. We focus on selected HARQ techniques applied to IP protocol and also to LMS channel. The efficiency of HARQ scheme is compared with GBN schemes using different lengths of IP packets. We show that usage of smaller packets and hybrid schemes leads to an improved throughput. Differences between pure and hybrid GBN schemes are also discussed.

Keywords: automatic repeat request (ARQ), hybrid ARQ (HARQ), internet protocol (IP), land mobile satellite (LMS), Reed-Solomon code (RS), go-back-N scheme (GBN)

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