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Transmit Diversity Technique and Simulations for Wireless Communications

Transmit Diversity Technique and Simulations for Wireless Communications. 指導老師 : 黃文傑 博士 學生 : 吳濟廷 2003.9.4. OUTLINE. Introduction Classical M aximal- R atio R eceiver C ombining Scheme New Transmit Diversity Scheme Performance Simulations Conclusion. Introduction.

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Transmit Diversity Technique and Simulations for Wireless Communications

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  1. Transmit Diversity Technique and Simulations for Wireless Communications 指導老師:黃文傑 博士 學生:吳濟廷 2003.9.4

  2. OUTLINE • Introduction • Classical Maximal-Ratio Receiver Combining Scheme • New Transmit Diversity Scheme • Performance Simulations • Conclusion

  3. Introduction • Next generation wireless system • Multipath fading • Tx power control • Why don’t we use receive diversity ? • Transmit diversity

  4. Classical MRRC Scheme Two-branch MRRC

  5. New Transmit Diversity Scheme • Two-Branch Transmit Diversity with One Receiver • Encoding and transmission sequence • Combining scheme

  6. New Transmit Diversity Scheme Encoding and transmission sequence

  7. New Transmit Diversity Scheme • The combining scheme: after substituting equations on previous page

  8. New Transmit Diversity Scheme • Resulting combined signals here are equivalent to that obtained from two-branch MRRC The new scheme The MRRC

  9. Performance Simulations • T2R1 • Sample time v.s. BER • SNR v.s. BER • T1R1 v.s. T2R1 • Performance in time scope

  10. Transmit Diversity Block Diagram Using Simulink

  11. T2R1 ~Sample time v.s. BER SNR = 5dB

  12. T2R1 ~ SNR v.s. BER Sample time=2000 sec

  13. Performance in time scope~T2R1 Sample time=10s SNR=5 dB BER=0.049

  14. Performance in time scope~T2R1 Sample time=10s SNR=10 dB BER=0.0098

  15. T1R1 Block Diagram Using Simulink

  16. Performance in time scope~T1R1 Sample time=10s SNR=5 dB BER=0.4851

  17. Performance in time scope~T1R1 Sample time=10s SNR=10 dB BER=0.4851

  18. T1R1 v.s. T2R1 ~SNR v.s. BER T1R1 T2R1

  19. Conclusion • Performance of TD(Tx2-Rx1) is so much better than the former scheme with Tx1-Rx1 • The performance is getting better when the diversity order increases

  20. Reference • [1]S.M. Almouti, ”A simple transmit diversity technique for wireless communications”, Journal of Selective Communications, Vol. 16, no. 8, pp. 1451-1458, Oct. 1998 • [2]H.K. Mecklai and R. S. Blum, ”Transmit antenna diversity for wireless communications”, 1995 IEEE • [3]T.H. Liew and Lajos Hanzo, “Space-time codes and concatenated channel codes for wireless communications”, proceedings of the IEEE, Vol. 90, no.2, Feb. 2002 • [4]E. Lindskog and A. Paulraj, “A transmit diversity scheme for channels with intersymbol interference’, 2000 IEEE • [5]S. Mudulodu and A. Paulraj, “A transmit diversity scheme for frequency selective fading channels”, 2000 IEEE

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