Cooperative Diversity in Wireless Networks

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Cooperative Diversity in Wireless Networks

• By Jules Merlin Mouatcho

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Outline

• Introduction to Cooperative Diversity
• Coded Cooperative scheme
• Simulation results
• Turbo Coded Cooperative scheme
• Simulation results
• Repeat-Puncture Turbo Coded Cooperation and
  Simulation Results
• Future Work
• Conclusion

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Cooperation and Spatial Diversity
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Cooperative Signalling Methods

• Amplify and Forward

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Cooperative Signalling Methods

• Detect and Forward
• CDMA approach of detect and forward

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Coded Cooperation

• Combines cooperation with channel coding
• More efficient use of available bandwidth
• Use of CRC to avoid propagation or errors
• Partners transmit additional parity bits

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Coded Cooperation
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RCPC Code realization
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Four Possible Cooperative Cases
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Simulation Results
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Simulation Results
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Coded Cooperation with Turbo Codes

• Partner receives and decodes single convolutional
  code.
• Base station iteratively decodes bits from
  frames1 and frames 2.

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Turbo Codes realization
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Simulation Results
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Repeat-Puncture Turbo Coded Cooperative scheme

• Repeat each bit L times prior to interleaving
• Puncture RSC2 parity sequence to control code rate

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Iterative Decoder Factor Graph
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Simulation Results
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Progress and Future Work

• Simulation of Coded Cooperation using RCPC codes.
• Simulation of Turbo Coded Cooperation
• Simulation of RP-Turbo Coded Cooperation
• Performance Analysis of the Repeat-Puncture Turbo
  Coded Cooperative scheme

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References

• T.M. Cover and A.A. El Gamal, Capacity Theorems
  for the Relay Channel, IEEE Trans. Inform.
  Theory, vol. 25, pp. 572-584, Sept 1979.
• T.E Hunter and Aria Nosratinia, Diversity
  Through Coded Cooperation, IEEE Trans. On
  Wireless Commun., vol. 5, no. 2, pp.283-289.
• A.Sendonaris, E.Erkip and B Aazhang, User
  Cooperation Diversity Part 1 System
  Description, IEEE Trans. Commun., vol. 51, no.
  11, pp 1927-1938.
• J.Hagenauer, Rate-Compatible Punctured
  Convolutional Codes (RCPC) and their
  applications, IEEE Trans. Commun., vol. 36,
  no.4, pp.389-400.
• J.N Laneman and G.W Wornell, An efficient
  protocol for realizing cooperative diversity in
  wireless networks, in Proc. IEEE Wireless
  Communications.
• W.E.Ryan, A Turbo Code Tutorial,New Mexico
  State University
• Y.Kim, J.Cho, W.Oh and K.Cheun, Improving the
  Performance of Turbo Codes by Repetition and
  Puncturing,Division of Electrical and Computer
  Engineering, University of Science and Technology