A digital fountain approach to reliable distribution of bulk data
Proceedings of the ACM SIGCOMM '98 conference on Applications, technologies, architectures, and protocols for computer communication
Performance evaluation of UDP lite for cellular video
NOSSDAV '01 Proceedings of the 11th international workshop on Network and operating systems support for digital audio and video
Application-specific protocol architectures for wireless networks
Application-specific protocol architectures for wireless networks
ICASSP '01 Proceedings of the Acoustics, Speech, and Signal Processing, 200. on IEEE International Conference - Volume 02
PPR: partial packet recovery for wireless networks
Proceedings of the 2007 conference on Applications, technologies, architectures, and protocols for computer communications
Beyond the bits: cooperative packet recovery using physical layer information
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Symbol-level network coding for wireless mesh networks
Proceedings of the ACM SIGCOMM 2008 conference on Data communication
Exploiting "approximate communication" for mobile media applications
Proceedings of the 10th workshop on Mobile Computing Systems and Applications
Cross-layer wireless bit rate adaptation
Proceedings of the ACM SIGCOMM 2009 conference on Data communication
Scalable WiFi media delivery through adaptive broadcasts
NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
Maranello: practical partial packet recovery for 802.11
NSDI'10 Proceedings of the 7th USENIX conference on Networked systems design and implementation
Channel coding with multilevel/phase signals
IEEE Transactions on Information Theory
Multilevel codes for unequal error protection
IEEE Transactions on Information Theory
Multicast and unicast real-time video streaming over wireless LANs
IEEE Transactions on Circuits and Systems for Video Technology
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All practical wireless communication systems are prone to errors. At the symbol level, such wireless errors have a well-defined structure: When a receiver decodes a symbol erroneously, it is more likely that the decoded symbol is a good "approximation" of the transmitted symbol than a randomly chosen symbol among all possible transmitted symbols. Based on this property, we define approximate communication, a method that exploits this error structure to natively provide unequal error protection to data bits. Unlike traditional [forward error correction (FEC)-based] mechanisms of unequal error protection that consume additional network and spectrum resources to encode redundant data, the approximate communication technique achieves this property at the PHY layer without consuming any additional network or spectrum resources (apart from a minimal signaling overhead). Approximate communication is particularly useful to media delivery applications that can benefit significantly from unequal error protection of data bits. We show the usefulness of this method to such applications by designing and implementing an end-to-end media delivery system, called Apex. Our Software Defined Radio (SDR)-based experiments reveal that Apex can improve video quality by 5-20 dB [peak signal-to-noise ratio (PSNR)] across a diverse set of wireless conditions when compared to traditional approaches. We believe that mechanisms such as Apex can be a cornerstone in designing future wireless media delivery systems under any error-prone channel condition.