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Cooperative Communication. Xu Jiaming. Outline. Introduction Cooperative Routing Power and Delay trade-off in Cooperative Networks Conclusion. Introduction. Two fundamental aspects of Wireless Networks multipath fading Interference. Multipath fading. Time diversity

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Presentation Transcript
outline
Outline
  • Introduction
  • Cooperative Routing
  • Power and Delay trade-off in Cooperative Networks
  • Conclusion
introduction
Introduction
  • Two fundamental aspects of Wireless Networks
      • multipath fading
      • Interference
multipath fading
Multipath fading
  • Time diversity

Coding and Interleaving

  • Frequency diversity

CDMA, OFDM

  • Spatial diversity

MISO, SIMO, MIMO

interference
Interference
  • TDMA

Graph Coloring

  • Contention-based mechanisms

Aloha, CSMA, etc

  • CDMA

Multiuser Detection (SIC)

summary
Summary

Building better bit pipes

Allocating bit pipes wisely

Can we exploit the interference?

Opportunistic Communication

Cross-layer Wireless Resource Allocation

can we exploit the interference
Can we exploit the interference?
  • What is the basic characteristic of wireless medium which causes the interference?
  • Cooperative communication
      • Cooperative diversity
summary1
Summary

Building better bit pipes

Allocating bit pipes wisely

Opportunistic Communication

Cooperative Communication

Cooperative Networks

Cross-layer Wireless Resource Allocation

cooperative routing
Cooperative Routing
  • Cooperative communication is a cross-layer issues.
  • Cooperative Routing
      • Reduce power consumption
      • Reduce Delay
what we learn
What we learn?
  • Power and Delay trade-off in Wireless Networks
    • Transmit the information to nodes far away
      • low delay but high power consumption
    • Transmit the information to nearby nodes
      • High delay but low power consumption
    • Transmitter makes a choice according to current channel state and buffer occupancy.
power and delay tradeoff curve
Power and Delay Tradeoff Curve

Power

Time Savings

Non-cooperative

Cooperative

Energy Savings

Delay

conclusion
Conclusion
  • Cooperative Communication.
  • Research Trends
      • Coded-based Cooperation
      • Capacity of Cooperative networks

Relay

S

D

relay

coded cooperation
Coded Cooperation
  • BC mode
    • Relay can decode
    • Destination may not
  • MAC mode
    • Relay re-encodes/transmits
    • Source transmits
      • New information
      • Repeats previous information
    • Destination decodes

correlation

modeling and mathematics
Modeling and Mathematics

Mathematical Heavy

We

Capacity

Modeling

Mathematical Low

New Capacity

cooperative routing1
Cooperative Routing
  • Cooperative communication is a cross-layer issues.
  • Cooperative Routing in static wireless networks.
    • Information is routed from s to d in a sequence of time slots
    • Each time slot
      • Broadcasting mode
      • Cooperation mode
      • Multistage decision problem
cooperation graph
Cooperation Graph
  • reliable set of nodes that have information at kth stage
  • set of nodes that will be added to reliable set in the next transmission
cooperative routing benefits
Cooperative Routing benefits
  • Restrict the cooperation to nodes along the optimal non-cooperative route.
  • Energy savings
alternative view toward cooperative routing
Alternative view toward Cooperative Routing
  • Cooperative communication increases the transmission range.
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