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Wireless Network Coding via Modified 802.11 MAC/PHY: Design and Implementation on SDR

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4 Author(s)
Firooz, M.H. ; Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA ; Zhiyong Chen ; Roy, S. ; Hui Liu

Network coding (NC), in principle, is a Layer-3 innovation that improves network throughput in wired networks for multicast/broadcast scenarios. Due to the fundamental differences between wired and wireless networks, extending NC to wireless networks generates several new and significant practical challenges. Two-way information exchange (both symmetric and asymmetric) between a pair of 802.11 sources/sinks using an intermediate relay node is a canonical scenario for evaluating the effectiveness of Wireless Network Coding (WNC) in a practical setting. Our primary objective in this work is to suggest pragmatic and novel modifications at the MAC and PHY layers of the 802.11 protocol stack on a Software Radio (SORA) platform to support WNC and obtain achievable throughput estimates via lab-scale experiments. Our results show that network coding (at the MAC or PHY layer) increases system throughput-typically by 20-30%.

Published in:

Selected Areas in Communications, IEEE Journal on  (Volume:31 ,  Issue: 8 )

Date of Publication:

August 2013

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