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Simulation Results of Coding Diversity Soft Handoff Design Soon-Yil Kwon, Young-Woo Yun , Young-Jo Lee, Ki-Jun Kim LGIC 3GPP2 TSG-C WG 3 Physical Layer April. 26, 2000 C30-20000426-006. Presentation Outline. Introduction and Motivation Softer Handoff Scheme

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  1. Simulation Results of Coding Diversity Soft Handoff Design Soon-Yil Kwon, Young-Woo Yun, Young-Jo Lee, Ki-Jun KimLGIC3GPP2 TSG-C WG 3 Physical LayerApril. 26, 2000C30-20000426-006

  2. Presentation Outline • Introduction and Motivation • Softer Handoff Scheme • The proposed Softer Handoff System Model • Simulation Configuration • Simulation Results • Conclusions SH31599.ppt 2

  3. Introduction and Motivation • Recent Measurements of an operating IS-95 CDMA Cellular System indicate that an average of 30% to 50% call period is in soft-handoff process • System Reliability during handoff becomes one of the major system performance parameters • We Propose “Novel Soft Handoff Method” to achieve a kind of coding diversity gain as well as conventional diversity gain • Coding diversity can be achieved by assigning different coding and puncturing to each base station in soft-handoff mode • First, the gain in the case of turbo codes will be demonstrated • This gain is also achievable for convolutional codes SH31599.ppt 3

  4. Softer Handoff Scheme System Model for the Cellular Handoff

  5. The proposed Softer Handoff System Model Transmitter structure for the turbo coding of cdma2000

  6. The proposed Softer Handoff System Model Receiver structure for turbo coding of cdma2000

  7. Simulation Configuration • Radio configuration: RC3(19200bps, Turbo coding), RC4(19200bps, Turbo coding), RC5(28800bps, Turbo coding), • Carrier frequency: 2GHz • Channel model: 1 path Rayleigh fading channel or Equal energy 2 path Rayleigh fading • The number of BS: 2 • PC step/ PC error/ PC Delay: 1 dB / 0 %/1 PCG • MIN/MAX of fraction power allocation: -40/-3 dB • Perfect channel estimation • Perfect SIR estimation for Power control SH31599.ppt 7

  8. Simulation Configuration (Cont’d) • Definitions • Ec : Average energy per PN chip for the traffic channel • Ior1: The total transmitted power spectral density from base station 1 • Ior2: The total transmitted power spectral density from base station 2 • Îor1: The received power spectral density from base station 1 • Îor2: The received power spectral density from base station 2 • Ioc: The power spectral density of a band-limited white noise source. • Legend • CUR(xdB): Normal softer Handoff case with (Îor1 + Îor2 ) / Ioc = xdB • PRO(xdB): Proposed softer Handoff case with (Îor1 + Îor2 ) / Ioc = xdB SH31599.ppt 8

  9. RC3 Result (1 path Rayleigh Fading) • Velocity 3km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  10. RC3 Result (1 path Rayleigh Fading) • Velocity 30km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  11. RC3 Result (1 path Rayleigh Fading) • Velocity 100km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  12. RC3 Result (2 path Rayleigh Fading) • Velocity 3km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  13. RC3 Result (2 path Rayleigh Fading) • Velocity 30km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  14. RC3 Result (2 path Rayleigh Fading) • Velocity 100km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  15. RC4 Result (1 path Rayleigh Fading) • Velocity 3km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  16. RC4 Result (1 path Rayleigh Fading) • Velocity 30km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  17. RC4 Result (1 path Rayleigh Fading) • Velocity 100km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  18. RC4 Result (2 path Rayleigh Fading) • Velocity 3km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  19. RC4 Result (2 path Rayleigh Fading) • Velocity 30km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  20. RC4 Result (2 path Rayleigh Fading) • Velocity 100km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  21. RC5 Result (1 path Rayleigh Fading) • Velocity 3km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  22. RC5 Result (1 path Rayleigh Fading) • Velocity 30km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  23. RC5 Result (1 path Rayleigh Fading) • Velocity 100km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  24. RC5 Result (2 path Rayleigh Fading) • Velocity 3km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  25. RC5 Result (2 path Rayleigh Fading) • Velocity 30km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  26. RC5 Result (2 path Rayleigh Fading) • Velocity 100km/hr, (Îor1 + Îor2 ) / Ioc = 3, 0, -3dB, Îor1/ Îor2 = 0dB

  27. Conclusions • We proposed a New Soft Handoff Scheme to achieve “coding diversity gain” • Except for RC 3, more than 0.5dB gain is achievable • Even for RC 3, no negligible effects can be found • The proposed Handoff Scheme provides seamless and transparent handoff to users SH31599.ppt 27

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