A cross-layer adaptive transmission scheme combined with SR-ARQ over correlated fading channels

Authors:
Junfeng Xiao;Shihong Zou;Jing Qiu;Shiduan Cheng
Affiliations:
State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China;State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China;School of Telecommunications Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China;State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, China
Venue:
Computers and Electrical Engineering
Year:
2008

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Abstract

Current adaptive transmission schemes all assume independent block fading. However, in slow fading channels, it is highly possible for consecutive block transmissions to be correlated. In this paper, we propose a cross-layer adaptive transmission scheme, which is an optimum combination of modulation format and packet size, combined with selective repeat automatic repeat request (SR-ARQ) to improve the throughput in correlated slow fading channels. We apply a multi-state Markov system model to analyze the system performance and to optimize the selection of modulation levels at the physical layer and packet sizes at the data link layer in a correlated slow fading channel, which is also described by a finite-state Markov chain. A general closed-form expression of the average throughput for this cross-layer adaptive transmission scheme is presented. Simulation results show that our adaptive transmission scheme combined with SR-ARQ can obtain a good performance in correlated slow fading channels.