دانلود مقاله ISI انگلیسی شماره 78717
ترجمه فارسی عنوان مقاله

تجزیه و تحلیل و برنامه ریزی از برنامه نویسی شبکه های عملی در شبکه های relay OFDMA

عنوان انگلیسی
Analysis and scheduling of practical network coding in OFDMA relay networks
کد مقاله سال انتشار تعداد صفحات مقاله انگلیسی
78717 2009 20 صفحه PDF
منبع

Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)

Journal : Computer Networks, Volume 53, Issue 12, 13 August 2009, Pages 2120–2139

ترجمه کلمات کلیدی
XOR؛ برنامه نویسی شبکه؛ شبکه های relay OFDM - مسیریابی؛ انتساب حامل؛ بهينه سازي
کلمات کلیدی انگلیسی
XOR; Network coding; OFDMA relay networks; Routing; Subcarrier assignment; Optimization
پیش نمایش مقاله
پیش نمایش مقاله  تجزیه و تحلیل و برنامه ریزی از برنامه نویسی شبکه های عملی در شبکه های relay OFDMA

چکیده انگلیسی

Network coding has become a prominent approach to improve throughput of wireless networks. However, most of work in the literature concentrates mainly on 802.11-like random access networks. New technologies such as OFDMA (orthogonal frequency division multiple access), offer new opportunities for employing network coding. This paper considers how to apply the practical network coding scheme in OFDMA relay networks via cross-layer optimization. Specifically, we aim to explore the following questions: (1) When and how can wireless nodes select relay paths in the presence of network coding? (2) How can an OFDMA relay system assign network resource such as subcarrier and power for all the transmitting nodes? (3) What are the impacts of OFDMA system parameters on the network coding gain? To answer these questions, two efficient coding-aware relay strategies are presented to select forwarding paths with fixed and dynamic power allocation. In order to exploit the network capacity in slow frequency selective fading channels, we formulate optimization frameworks and propose channel-aware coding-aware resource allocation algorithms for an arbitrary traffic pattern. Our studies show that the network coding (i.e. XOR) gain depends on the nodes’ powers, traffic patterns etc. Especially, OFDMA relay network with dynamic power possesses both coding gain and power gain. Extensive simulations are performed to verify our analysis and demonstrate the throughput improvement of our proposals in the presence of XOR coding.