NDLI: Symbol-level network coding for wireless mesh networks

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Symbol-level network coding for wireless mesh networks

Content Provider	ACM Digital Library
Author	Katti, Sachin Balakrishnan, Hari Medard, Muriel Katabi, Dina
Abstract	This paper describes MIXIT, a system that improves the throughput of wireless mesh networks. MIXIT exploits a basic property of mesh networks: even when no node receives a packet correctly, any given bit is likely to be received by some node correctly. Instead of insisting on forwarding only correct packets, MIXIT routers use physical layer hints to make their best guess about which bits in a corrupted packet are likely to be correct and forward them to the destination. Even though this approach inevitably lets erroneous bits through, we find that it can achieve high throughput without compromising end-to-end reliability. The core component of MIXIT is a novel network code that operates on small groups of bits, called symbols. It allows the nodes to opportunistically route groups of bits to their destination with low overhead. MIXIT's network code also incorporates an end-to-end error correction component that the destination uses to correct any errors that might seep through. We have implemented MIXIT on a software radio platform running the Zigbee radio protocol. Our experiments on a 25-node indoor testbed show that MIXIT has a throughput gain of 2.8x over MORE, a state-of-the-art opportunistic routing scheme, and about 3.9x over traditional routing using the ETX metric.
Starting Page	401
Ending Page	412
Page Count	12
File Format	PDF
ISBN	9781605581750
DOI	10.1145/1402958.1403004
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2008-08-17
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Cooperative diversity Wireless networks Network coding
Content Type	Text
Resource Type	Article

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