Wireless Network Coding via Modified 802.11 MAC/PHY: Design and Implementation on SDR
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. The authors' primary objective in this paper 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.