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PPT : Networks and Mobile Systems
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Dina and Jon transmit simultaneously
Router amplifies and broadcasts interfered signal
Dina subtracts known signal from interfered signal
Dina and Robert transmit simultaneously
Router amplifies and broadcasts interfered signal
Dina subtracts known signal from interfered signal
Analog Network Coding requires 2 time slots
It Is More Than Going From 3 To 2!
Philosophical shift in dealing with interference
Strategically exploit interference instead of avoiding it
Promises new ways of dealing with hidden terminals
Hidden Terminal Scenario
Src and R2 transmit simultaneously
Hidden Terminal Scenario
Src and R2 transmit simultaneously
R1 subtracts P1, which he relayed earlier to recover P2 that he wants
Hidden Terminal Scenario
R2 and Src are hidden terminals
Today : Simultaneous transmission ? Collision
ANC : Simultaneous transmission ? Success!
Hidden Terminal Scenario
Other Benefits of ANC:
First step toward addressing hidden terminals
ANC extends network coding to new scenarios
How do we make it work?
Practical Challenges
Interfered signal is not exactly the sum
Channel distorts signals
Two signals are never synchronized
It is not sD(t) + sJ(t) but f1(sD(t)) + f2(sJ(t-T))
Prior work assumes full synchronization and ignores channel distortion
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Category : Mobile SystemsSource : nms.csail.mit.edu
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