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Cooperative Communication in Wireless Networks

Cooperative Communication in Wireless Networks. Aria Nosratinia, University of Texas, Dallas, Todd E. Hunter, Nortel Networks Ahmadreza Hedayat, University of Texas, Dallas. IEEE Communications Magazine October 2004. Speaker ： Ching-Chung Lin. Outline. Introduction Assumption

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Cooperative Communication in Wireless Networks

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  1. Cooperative Communication inWireless Networks Aria Nosratinia, University of Texas, Dallas, Todd E. Hunter, Nortel Networks Ahmadreza Hedayat, University of Texas, Dallas IEEE Communications Magazine October 2004 Speaker：Ching-Chung Lin

  2. Outline • Introduction • Assumption • Cooperative Communication • Performance • Conclusion

  3. Introduction • The mobile wireless channel suffers from fading • signal attenuation can vary significantly • Transmitting independent copies of the signal from different location • generates spatial diversity • effectively combat fading

  4. B C A

  5. Assumption • One antenna • Each host have one partner • may be assigned mutually by the base station • Each host is a both a user and a relay • One cooperator forward “overheard” information

  6. Cooperative Communication • Amplify and forward • Decode and forward • Coded cooperation

  7. Cooperative Communication • Amplify and forward • Decode and forward • Coded cooperation

  8. Amplify and forward • Assumption • Each user receives a noisy versionof the signal transmitted by its partner • The base station knows the interuser channel coefficients to do optimal decoding

  9. B C relay destination A User

  10. Cooperative Communication • Amplify and forward • Decode and forward • Coded cooperation

  11. Decode and forward • Assumption • each user • transmits its own bits • detects the other user’s second bit

  12. Decode and forward • symbol definition • each user has its own spreading code C1(t) C2(t) • two user’s data bits • Signal amplitudes i：transmission interval j：power level ex：

  13. Decode and forward

  14. Decode and forward

  15. Decode and forward

  16. Decode and forward • J. N. Laneman, G. W. Wornell, and D. N. C. Tse, “An Efficient Protocol for Realizing Cooperative Diversity in Wireless Networks,” Proc. IEEE ISIT, Washington, DC,June 2001 • When the SNR is high , user enter into cooperative mode. • When the SNR is low , user enter into noncooperative mode.

  17. Cooperative Communication • Amplify and forward • Decode and forward • Coded cooperation

  18. Coded cooperation • each user • decode the transmission of its partner • data is encoded into a codeword • N bits = N1 + N2

  19. Frame2 Frame1 N2 bits : userA’s data N1 bits : userB’s data B C Frame1 Frame2 N1 bits : userA’s data N2 bits : userB’s data A

  20. Frame1 N1 bits : userB’s data B C Frame1 N1 bits : userA’s data A

  21. Performance • rate-compatible punctured convolutional (RCPC) codes

  22. User 2 destination SNR=X SNR=X SNR=X User 1

  23. Performance

  24. User 2 destination SNR=X SNR=X SNR=X+10 User 1

  25. Performance

  26. conclusion • Results to date are indicative of a promising future for cooperative communication.

  27. Thank You

  28. 英 文： Block Error Rate (BKER, BLER) • 台 灣： 塊誤率 • 大 陸： N/A • 修訂時間： 2000/9/13 • 字組錯誤率，數據組出錯率，信息組差錯率錯誤地接收方塊 (Blocks) 的數目和送出方塊總數目的比率，來衡量塊處理效果。

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