کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
455425 695369 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A cross-layer adaptive transmission scheme combined with SR-ARQ over correlated fading channels
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر شبکه های کامپیوتری و ارتباطات
پیش نمایش صفحه اول مقاله
A cross-layer adaptive transmission scheme combined with SR-ARQ over correlated fading channels
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computers & Electrical Engineering - Volume 34, Issue 4, July 2008, Pages 324–337
نویسندگان
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