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Diversity and Error Compensation in OFDM Transceivers: Principles and Implementation

Diversity and Error Compensation in OFDM Transceivers: Principles and Implementation. Fire Tom Wada Professor, Information Engineering, Univ. of the Ryukyus Chief Scientist at Magna Design Net, Inc wada@ie.u-ryukyu.ac.jp http://www.ie.u-ryukyu.ac.jp/~wada/. Section 1.

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Diversity and Error Compensation in OFDM Transceivers: Principles and Implementation

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  1. Diversity and Error Compensation in OFDM Transceivers: Principles and Implementation Fire Tom Wada Professor, Information Engineering, Univ. of the Ryukyus Chief Scientist at Magna Design Net, Inc wada@ie.u-ryukyu.ac.jp http://www.ie.u-ryukyu.ac.jp/~wada/ Fire Tom Wada, Univ. of the Ryukyus

  2. Section 1 OFDM transceivers: Principles and design Fire Tom Wada, Univ. of the Ryukyus

  3. 18.2.1Single Carrier vs. Multi Carrier Fire Tom Wada, Univ. of the Ryukyus

  4. 18.2.2OFDM signal generation (1) • Orthogonal relations • One subcarrier signal • Baseband OFDM signal • Complex baseband OFDM signal Fire Tom Wada, Univ. of the Ryukyus

  5. OFDM signal generation (2) • Sampled by N points • Passband signal Fire Tom Wada, Univ. of the Ryukyus

  6. OFDM Transmitter Block Diagram Fire Tom Wada, Univ. of the Ryukyus

  7. 18.2.3 OFDM signal reception (1) • Passband signal • Direct down conversion • Applying the low pass filter • Another direct conversion Fire Tom Wada, Univ. of the Ryukyus

  8. OFDM signal reception (2) • Combining SI(t) and SQ(t) • Sampling • IDFT operation • DFT operation Fire Tom Wada, Univ. of the Ryukyus

  9. Simple OFDM Receiver Block Diagram Fire Tom Wada, Univ. of the Ryukyus

  10. 18.2.4Multipath channel Fire Tom Wada, Univ. of the Ryukyus

  11. Guard Interval Fire Tom Wada, Univ. of the Ryukyus

  12. 18.2.5 Channel Estimation and Equalizer • Reception signal sR(t) • CTF • Frequency domain • Equalization Fire Tom Wada, Univ. of the Ryukyus

  13. 18.2.6OFDM communication and broadcasting systems Fire Tom Wada, Univ. of the Ryukyus

  14. Synchronization • Radio frequency (RF) synchronization • Sampling rate synchronization • Symbol timing (FFT window position) synchronization Fire Tom Wada, Univ. of the Ryukyus

  15. OFDM communication and broadcasting system Fire Tom Wada, Univ. of the Ryukyus

  16. 18.2.7OFDM WLAN design Fire Tom Wada, Univ. of the Ryukyus

  17. WLAN frame format and receiver tasks Fire Tom Wada, Univ. of the Ryukyus

  18. WLAN Block Diagram Fire Tom Wada, Univ. of the Ryukyus

  19. 18.2.8OFDMA transceiver design Fire Tom Wada, Univ. of the Ryukyus

  20. TDD Frame and GAP Fire Tom Wada, Univ. of the Ryukyus

  21. simplified OFDMA and SC-FDMA Fire Tom Wada, Univ. of the Ryukyus

  22. Base Station TX and RX Fire Tom Wada, Univ. of the Ryukyus

  23. User Terminal TX and RX Fire Tom Wada, Univ. of the Ryukyus

  24. Section 3 Error Detection and Compensation Fire Tom Wada, Univ. of the Ryukyus

  25. 18.4.1 Time domain RF error detection and compensation Fire Tom Wada, Univ. of the Ryukyus

  26. Time domain RF error compensation feedback Fire Tom Wada, Univ. of the Ryukyus

  27. 18.4.2 Time domain FFT window position detection and RF error detection Fire Tom Wada, Univ. of the Ryukyus

  28. 18.4.3 Time domain RF error, sampling error, and symbol timing detection and compensation Fire Tom Wada, Univ. of the Ryukyus

  29. Time domain RF error and sampling clock error compensation Fire Tom Wada, Univ. of the Ryukyus

  30. 18.4.4 Frequency domain RF error and sampling error detection Fire Tom Wada, Univ. of the Ryukyus

  31. Frequency domain RF error and sampling error detection (2) Fire Tom Wada, Univ. of the Ryukyus

  32. 18.4.5 Delay profile detection and frequency domain FFT position detection Fire Tom Wada, Univ. of the Ryukyus

  33. 18.4.6 FFT window shift detection by constellation rotation and compensation Fire Tom Wada, Univ. of the Ryukyus

  34. Section 4 Hardware Implementation and System Integration Fire Tom Wada, Univ. of the Ryukyus

  35. 18.5.1 Four antenna adaptive array combiner LSI Fire Tom Wada, Univ. of the Ryukyus

  36. Four antenna adaptive array combiner LSI (2) Fire Tom Wada, Univ. of the Ryukyus

  37. 18.5.2 A 2/4/8 Antennas Configurable Diversity OFDM Receiver LSI Fire Tom Wada, Univ. of the Ryukyus

  38. A 2/4/8 Antennas Configurable Diversity OFDM Receiver LSI (2) Fire Tom Wada, Univ. of the Ryukyus

  39. 18.5.3 Joint Hardware-Software Implementation of Adaptive array antenna OFDM receiver by FPGA Fire Tom Wada, Univ. of the Ryukyus

  40. Joint Hardware-Software Implementation of Adaptive array antenna OFDM receiver by FPGA (2) Fire Tom Wada, Univ. of the Ryukyus

  41. Joint Hardware-Software Implementation of Adaptive array antenna OFDM receiver by FPGA (3) Fire Tom Wada, Univ. of the Ryukyus

  42. 3.2.4 Hybrid Pre-FFT Adaptive Array Antenna and Post-FFT Space Diversity Combining for Mobile ISDB-T Receiver by FPGA Fire Tom Wada, Univ. of the Ryukyus

  43. System configurations A and B Fire Tom Wada, Univ. of the Ryukyus

  44. Hybrid Pre-FFT Adaptive Array Antenna and Post-FFT Space Diversity Combining for Mobile ISDB-T Receiver by FPGA (3) Fire Tom Wada, Univ. of the Ryukyus

  45. Conclusion • In section 1 • Basic OFDM equations are reviewed • 3 key synchronization • Architecture examples • In section 3 • Synchronization error detection and compensations • Time domain & Frequency domain • In section 4, Some real design examples Fire Tom Wada, Univ. of the Ryukyus

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