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24-04-2020 | Research Article-Electrical Engineering | Issue 8/2020

Arabian Journal for Science and Engineering 8/2020

Optimal Packet Length for ARQ and HARQ I with Chase Combining

Journal:
Arabian Journal for Science and Engineering > Issue 8/2020
Authors:
Ghassan Alnwaimi, Hatem Boujemaa, Kamran Arshad

Abstract

In this paper, we derive the optimal packet length for automatic repeat request (ARQ) protocols and hybrid ARQ I (HARQ I) protocols with chase combining. Chase combining consists of a maximum ratio combination of received packets. The average signal-to-noise ratio is measured at the receiver and sent back to the transmitter to adapt packet length. The study is valid for any M-QAM (quadrature amplitude modulation). HARQ I protocol uses a convolutional encoder. Simulation results have shown that the proposed adaptive link layer protocol using optimal packet length allows 0.7–4 dB gains with respect to fixed packet length.

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