Cooperative communication
Download
1 / 19

Cooperative Communication - PowerPoint PPT Presentation


  • 88 Views
  • Uploaded on

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

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Cooperative Communication' - germane-gomez


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
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.


ad