andrew lippman lip@mit october, 2004
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Viral Radio. Andrew Lippman [email protected] October, 2004. Viral Innovation. Scalable Incremental Contributory. Viral systems are innovative through modularity and distribution of capability -- the intelligence is at the ends e.g.: Fax machines, Internet. Viral Radio. - PowerPoint PPT PresentationTRANSCRIPT
Scalable
Incremental
Contributory
Viral Innovation
Viral systems are innovative through modularity and distribution of capability -- the intelligence is at the ends
e.g.: Fax machines, Internet
Viral Radio
CapacityBandwidth/Noden
CapacityBandwidth/Node
~nn
Open systems such as PCs gain capacity with more units, traditional communications systems divide fixed capacity among elements.
Can we make communications systems (telephones, networks) that are viral and economic?
Social Context
Network Co-generation
Delivers realtime information by using intelligent RF
Scales adhoc networks by limiting radiation to nodes in between two parties
Radios costing less than radio waves (Breadcrumbs)
There are no receivers (Receiving costs more than transmitting)
Radio Magic
Collaboration makes it work
Wireless = Broadcast (it makes it hard… it makes it challenging…)
“Wireless Broadcast Advantage”
Antenna Sharing: exploits observation of a common “property” across different users (antennas) in space…
Our contribution: distributed, “adaptive” algorithmsapplicable in practice…
Direct Multi-hop Cooperative
(Special case of co-op)
Cooperative Propagation
Aggelos Bletsas, 2004
Closer is not always the better… fading is not always harmful (MIMO results)…
Instantaneous wireless channel conditions matter (not only average) -
Algorithms should adapt to wireless propagation “instantaneously” (within channel coherence time) - no need for topology estimation…
Propagation Space
Aggelos Bletsas, 2004
Method of distributed timers = opportunistic relaying
Mapping channel conditions to time!
Exploiting RTS/CTS packets of MAC and reciprocity…best path = relay that expires first…
Collision probability depends on λ (user defined)…
RTS
CTS
Test Case
Aggelos Bletsas, 2004
Antenna sharing for cooperative position estimation
Estimate your location relatively to neighbors with “good” signal paths (high SNR measurements).
Prior art found in protein structure determination(“molecular distance geometry problem”)…
Local Space and Time
Aggelos Bletsas, 2004
Radio Magic
Radio Magic
