1 / 20

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.

arnav
Download Presentation

Transmit Diversity Technique and Simulations for Wireless Communications

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. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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

More Related