A Computational Approach to Edge Detection
IEEE Transactions on Pattern Analysis and Machine Intelligence
The art of computer programming, volume 1 (3rd ed.): fundamental algorithms
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Discrete-time signal processing (2nd ed.)
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WiTMeMo '05 Papers presented at the 2005 workshop on Wireless traffic measurements and modeling
Digital Image Processing (3rd Edition)
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IMC '05 Proceedings of the 5th ACM SIGCOMM conference on Internet Measurement
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NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
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IEEE Transactions on Circuits and Systems for Video Technology
Practical implementation of blind synchronization in NC-OFDM based cognitive radio networks
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IMC '10 Proceedings of the 10th ACM SIGCOMM conference on Internet measurement
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FLUID: improving throughputs in enterprise wireless lans through flexible channelization
MobiCom '11 Proceedings of the 17th annual international conference on Mobile computing and networking
FERMI: a femtocell resource management system forinterference mitigation in OFDMA networks
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CRMA: collision-resistant multiple access
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Picasso: full duplex signal shaping to exploit fragmented spectrum
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Proceedings of the 1st International Conference on Wireless Technologies for Humanitarian Relief
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NSDI'12 Proceedings of the 9th USENIX conference on Networked Systems Design and Implementation
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IEEE/ACM Transactions on Networking (TON)
Picasso: flexible RF and spectrum slicing
ACM SIGCOMM Computer Communication Review - Special october issue SIGCOMM '12
Weeble: enabling low-power nodes to coexist with high-power nodes in white space networks
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IEEE/ACM Transactions on Networking (TON)
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IEEE/ACM Transactions on Networking (TON)
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IEEE/ACM Transactions on Networking (TON)
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With the advent of new FCC policies on spectrum allocation for next generation wireless devices, we have a rare opportunity to redesign spectrum access protocols to support demanding, latency-sensitive applications such as high-def media streaming in home networks. Given their low tolerance for traffic delays and disruptions, these applications are ill-suited for traditional, contention-based CSMA protocols. In this paper, we explore an alternative approach to spectrum access that relies on frequency-agile radios to performinterference-free transmission across orthogonal frequencies. We describe Jello, a MAC overlay where devices sense and occupy unused spectrum without central coordination or dedicated radio for control. We show that over time, spectrum fragmentation can significantly reduce usable spectrum in the system. Jello addresses this using two complementary techniques: online spectrum defragmentation, where active devices periodically migrate spectrum usage, and non-contiguous access, which allows a single flow to utilize multiple spectrum fragments. Our prototype on an 8-node GNU radio testbed shows that Jello significantly reduces spectrum fragmentation and provides high utilization while adapting to client flows' changing traffic demands.