Title :
Wireless Network Coding via Modified 802.11 MAC/PHY: Design and Implementation on SDR
Author :
Firooz, Mohammad Hamed ; Zhiyong Chen ; Roy, Sandip ; Hui Liu
Author_Institution :
Dept. of Electr. Eng., Univ. of Washington, Seattle, WA, USA
Abstract :
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%.
Keywords :
access protocols; network coding; radio links; radio networks; software radio; wireless LAN; IEEE 802.11 source-sink; NC; SDR; SORA platform; WNC; canonical scenario; layer-3 innovation; modified IEEE 802.11 MAC-PHY; multicast-broadcast scenario; software radio platform; two-way information exchange; wired networks; wireless network coding; Encoding; IEEE 802.11 Standards; Network coding; Relays; Throughput; Wireless networks; MAC-layer network coding; OFDM systems; PHY network coding; Wireless network coding; decode-and-forward; joint modulation;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
DOI :
10.1109/JSAC.2013.130823