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  1. The Softest Handoff DesignUsing Iterative Decoding (Turbo Coding)Byung K. YiLGIC3GPP2 TSG-C WG 3 Physical LayerJan. 11, 2000

  2. Presentation Outline • Introduction and Motivation • IS-95 Soft Handoff Scheme • The Novel Forward Link System Model for the CCPC Handoff Scheme • Simulation Results Over AWGN and Rayleigh Channels • Upper Bounding Performances Over AWGN and Rayleigh Channels • Reverse Link System Model for the CCPA Handoff Scheme • Conclusions SH31599.ppt 2

  3. Introduction and Motivation • Recent Measurements of an operating IS-95 CDMA Cellular System indicate that About 30% to 50% of an average call period Is in soft-handoff process • System Reliability during handoff becomes one of the major system performance parameters • Turbo Codes have been adapted for the 3rd Generation Standards: CDMA 2000 (3GPP II) and 3GPP • Are there techniques providing soft handoffs without increasing the transmitter power and bandwidth? • Can we achieve a type of “Soft” Handoff for TDMA, FDMA, CDMA-to-CDMA System, or between various dual mode operations? SH31599.ppt 3

  4. Introduction and Motivation (Cont’d) • Are There Any Inherent benefits using the turbo code for next generation multi-media traffics beyond the Coding Gain? • Answers Are “YES” • Code Combining and Packet Combining (CCPC) Scheme in Conjunction With Iterative Turbo Decoding SH31599.ppt 4

  5. IS-95 Soft Handoff System Model for the Cellular Handoff

  6. IS-95 System Models for the Forward Link IS-95 CDMA Forward Link Receiver

  7. IS-95 Soft Handoff Maximal Ratio Combiner of the Forward Link

  8. IS-95 Soft Handoff System Model for the Reverse Link

  9. The Novel Softest Handoff System Model for Forward Link Transmitter for the CCPC Handoff

  10. X1 MUX + To Base Station A D D D + dk Y1 + Puncturer #1 I X2 MUX + To Base Station B D D D + Puncturer #2 Y2 + The Novel Softest Handoff System Model for Forward Link Detailed Encoder for the CCPC Handoff for Code Rate 1/2

  11. X1 MUX + dk D D D + Y1 + Puncturer #1 Y2 + I X2 MUX + D D D + Puncturer #2 Y3 + Y4 + The Novel Softest Handoff System Model for Forward Link Detailed Encoder for the CCPC Handoff for Code Rate 1/3 To Base Station A To Base Station B

  12. The Novel Softest Handoff System Model for Forward Link Detailed Signal Puncturing for the CCPC Handoff

  13. The Novel Softest Handoff System Model for Forward Link Mobile Receiver for the CCPC Handoff

  14. The Novel Softest Handoff System Model for Forward Link Detailed Decoder for the CCPC Handoff Scheme

  15. Simulation Results for the Code Rate 1/2 BER over AWGN Channel

  16. Simulation Results for the Code Rate 1/2 FER over AWGN Channel

  17. Simulation Results for the Code Rate 1/2 BER over Rayleigh Fading Channel

  18. Simulation Results for the Code Rate 1/2 FER over Rayleigh Fading Channel

  19. Upper bounding Performance Upper bounding Performance for Code Rate 1/2 BER over AWGN

  20. Upper bounding Performance Upper bounding Performance for Code Rate 1/2 FER over AWGN

  21. Comparison between Simulations and Upper Bounding Results Frame Error rates for AWGN Channel

  22. Comparison between Simulations and Upper Bounding Results Bit Error rates for AWGN Channel

  23. Upper bounding Performance Upper bounding Performance for Code Rate 1/2 FER over AWGN Channel for Different TX Power Cases

  24. Upper bounding Performance Upper bounding Performance for Code Rate 1/2 BER over AWGN Channel for Different TX Power Cases

  25. Upper bounding Performance Upper bounding Performance for Code Rate 1/2 FER over Rayleigh Fading Channel for the Same TX Power Case

  26. Upper bounding Performance Upper bounding Performance for Code Rate 1/2 BER over Rayleigh Fading Channel for the Same TX Power Case

  27. Comparison between Simulations and Upper Bounding Results Frame Error rates for Rayleigh Fading Channel

  28. Comparison between Simulations and Upper Bounding Results Bit Error rates for Rayleigh Fading Channel

  29. Upper bounding Performance for Code Rate 1/2 FER over Rayleigh Fading Channel for Different TX Power Cases

  30. Upper bounding Performance for Code Rate 1/2 BER over Rayleigh Fading Channel for Different TX Power Cases

  31. Upper bounding Performance for Code Rate 1/2 FER Performance Comparison between 2-UNINTER and UNINT+INT Over AWGN Channel

  32. Upper bounding Performance for Code Rate 1/2 BER Performance Comparison between 2-UNINTER and UNINT+INT Over AWGN Channel

  33. Upper bounding Performance for Code Rate 1/2 BER Performance Comparison between 2-UNINTER and UNINT+INT Over Layleigh Fading Channel

  34. Upper bounding Performance for Code Rate 1/3 FER over AWGN

  35. Upper bounding Performance for Code Rate 1/3 BER over AWGN

  36. Upper bounding Performance for Code Rate 1/3 BER over AWGN Channel for Different TX Power Cases

  37. Upper bounding Performance for Code Rate 1/3 FER over AWGN Channel for Different TX Power Cases

  38. Upper bounding Performance for Code Rate 1/3 BER over AWGN Channel for Different TX Power Cases

  39. Upper bounding Performance for Code Rate 1/3 FER over Rayleigh Channel for Different TX Power Cases

  40. Upper bounding Performance for Code Rate 1/3 BER over Rayleigh Channel for Different TX Power Cases

  41. Conclusions • We Proposed a New Soft Handoff Scheme Combining With CCPC Scheme With Iterative Turbo Decoding • We Demonstrated Not Only an Unprecedented Coding Gain From Iterative Turbo Code, but Also More Than 3.2 dB and 4.0 dB Diversity Gains Due to the CCPC Scheme • The CCPC Handoff Provides “the Softest” Handoff Mechanism for CDMA Systems • The CCPC Handoff Can Allow a Type of Soft Handoff for TDMA, FDMA, CDMA-to- CDMA, or Between Dual Mode Operations • The CCPC Handoff Scheme Provides Seamless and Transparent Handoff to Users SH31599.ppt 41