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A Simple Transmit Diversity Technique for Wireless Communications

A Simple Transmit Diversity Technique for Wireless Communications. 指導老師 : 黃文傑 博士 學生 : 吳濟廷 2003.8.13. OUTLINE. Introduction Classical M aximal- R atio R eceiver C ombining Scheme New Transmit Diversity Scheme Two-branch transmit diversity with one receiver

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A Simple Transmit Diversity Technique for Wireless Communications

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  1. A Simple Transmit Diversity Technique for Wireless Communications 指導老師:黃文傑 博士 學生:吳濟廷 2003.8.13

  2. OUTLINE • Introduction • Classical Maximal-Ratio Receiver Combining Scheme • New Transmit Diversity Scheme • Two-branch transmit diversity with one receiver • Two-branch transmit diversity with M receiver • Error 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(1/2) Two-branch MRRC

  5. Classical MRRC Scheme(2/2) Using the maximum likelihood decision rule for PSK signals (equal energy constellations) may be simplified to

  6. New Transmit Diversity Scheme • Two-Branch Transmit Diversity with One Receiver • Encoding and transmission sequence • Combining scheme • Maximum likelihood decision rule • Two-Branch Transmit Diversity with M Receiver

  7. Two-Branch Transmit Diversity with One Receiver(1/3) Encoding and transmission sequence Two-Branch Transmit Diversity with One Receiver

  8. Two-Branch Transmit Diversity with One Receiver(2/3) • The combining scheme: after substituting equations on previous page

  9. Two-Branch Transmit Diversity with One Receiver(3/3) • The maximum likelihood decision rule • Resulting combined signals here are equivalent to that obtained from two-branch MRRC The MRRC The new scheme

  10. Two-Branch Transmit Diversity with M Receiver(1/3) Channels between the Tx and Rx antennas Notation for the two received antennas Two-Branch Transmit Diversity with Two Receiver

  11. Two-Branch Transmit Diversity with M Receiver(2/3) • The combiner builds two signals substituting the appropriate equations equivalent to that of 4-branch MRRC

  12. Two-Branch Transmit Diversity with M Receiver(3/3) • Signals from 2 receive antennas are the simple addition of signals from each receive antennas

  13. Error Performance Simulations BER performance comparison of MRRC and two-branch transmit diversity

  14. Conclusion • 2 Tx–1 Rx(New)=1 Tx–2 Rx(MRRC) => 2 Tx - M Rx = 1 Tx - 2M Rx • Doesn’t need any feedback • Computation complexity is similar to MRRC • Performance is identical to MRRC (total power isn’t limited)

  15. 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

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