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Yong Zhou 2012-07-19

Energy-Efficient Protocol for Cooperative Networks IEEE/ACM Transactions on Networking, Apr. 2011 Mohamed Elhawary, Zygmunt J. Haas. Yong Zhou 2012-07-19. Outline. Introduction Cooperative Protocol Protocol Robustness and Energy Efficiency Simulation Results Conclusions. Introduction.

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Yong Zhou 2012-07-19

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  1. Energy-Efficient Protocol for Cooperative NetworksIEEE/ACM Transactions on Networking, Apr. 2011Mohamed Elhawary, Zygmunt J. Haas Yong Zhou 2012-07-19

  2. Outline • Introduction • Cooperative Protocol • Protocol Robustness and Energy Efficiency • Simulation Results • Conclusions

  3. Introduction • Wireless sensor networks: limited energy resources • Cooperative transmission: • Virtual antenna array • Diversity gain • Energy efficient

  4. Cooperative Protocol - CwR • Cluster head, sending cluster, receiving cluster • Path width • Two phases: routing (AODV), recruiting-and-transmitting

  5. Assumptions • Sending nodes are synchronized • Receiving power is the sum of all the signal powers coming from all the senders

  6. CAN

  7. Recruiting Phase

  8. BER-MISO

  9. Protocol Robustness (1) • Denote the transmission pattern of nodes in a sending cluster by a binary representation bm-1 … b1 b0 according to which node j transmits if bj = 1 and does not transmit if bj = 0. • Similarly, denote the reception status of nodes in a receiving cluster by a binary representation bm-1 … b1 b0 according to which node j correctly receives the packet if bj = 1 and receives the packet in error if bj = 0.

  10. Protocol Robustness (2)

  11. Protocol Robustness (3)

  12. Other Protocols • Disjoint-paths: • One-Path

  13. Failure Probability

  14. Energy Consumption • To make the comparison of energy consumption of any two schemes meaningful, the failure probability needs to be kept equal for the compared schemes. • Thus, the needed transmission power for each case can be calculated according to the analysis of robustness.

  15. Power Ratio

  16. Conclusions • Propose an energy-efficient cooperative protocol • Analyze the robustness and energy consumption of the protocol

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