Network coded wireless architecture
Abstract
Wireless will be the dominant mode of network access in the future, yet, presently they are not pervasive, fast or reliable enough to realize the vision of an unwired world. Wireless mesh networks promise an attractive solution to these problems; cheap deployment, extended range and fast connectivity. While they have enjoyed limited success in providing low-cost low-speed Internet connectivity, they are ill-suited to meet the high throughput demands of applications such as high definition video, P2P file sharing, etc. Motivated by these problems, in this dissertation, we present a new wireless mesh network architecture built around network coding to significantly improve performance.
This dissertation advocates a fundamental shift in how networks are designed. Instead of routers being constrained to simply storing and forwarding packets without modifications, it gives routers the freedom to code information, i.e. perform network coding. Routers can, when beneficial, xor packets, linearly combine symbols or even mix analog signals. Armed with this new functionality, we can, with novel algorithms, exploit the intrinsic characteristics of the wireless medium to deliver large throughput gains. We design three systems which embody this philosophy: COPE, ANC and MIXIT. COPE uses the ability to code packets to perform in-network compression by exploiting wireless broadcast and increases performance. ANC employs network coding of analog signals to exploit strategic interference,…
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