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DVB

DVB. 高永安 老師 報告人：吳林達 報告日期： 2005/12/1. outline. Bit interleaver Symbol interleaver Mapping OFDM 架構 Reference signal. Bit interleaver(1). QPSK:2 層 bit interleaver 規則性 :. Bit interleaver(2). 16QAM:4 層 bit interleaver 規則性 :. Bit interleaver(3). 64QAM:6 層 bit interleaver 規則性 :.

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DVB

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  1. DVB 高永安老師 報告人：吳林達 報告日期：2005/12/1

  2. outline • Bit interleaver • Symbol interleaver • Mapping • OFDM架構 • Reference signal

  3. Bit interleaver(1) • QPSK:2層bit interleaver • 規則性:

  4. Bit interleaver(2) • 16QAM:4層bit interleaver • 規則性:

  5. Bit interleaver(3) • 64QAM:6層bit interleaver • 規則性:

  6. Symbol interleaver

  7. Mapping(1)

  8. Mapping(2) • 調變方式：QPSK、16QAM、64QAM、non-uniform 16QAM、non-uniform 64QAM(以gray code排列再做一次排列) • 均勻非均勻由 決定 • HP bit=high priority bit(全部bit中前面一半的bit)

  9. 均勻16QAM,

  10. 非均勻16QAM,

  11. 非均勻16QAM,

  12. OFDM frame架構(1)

  13. OFDM frame架構(2) • 2k mode： • 1symbol-2048子載波 • 使用其中1715個子載波 • 2048-1715=343guard band • 1715個中有1512個傳data • 1715-1512=193pilot

  14. OFDM frame架構(3) • 8k mode： • 1symbol-8192子載波 • 使用其中6817個子載波 • 8192-6817=1375guard band • 6817個中有6048個傳data • 6817-6048=769pilot

  15. OFDM frame架構(3) • 頻寬規格： 8MHz、7MHz、6MHz • 基本週期(T)： 、 、

  16. 參數 • 2kmode: • 8kmode:

  17. 111

  18. 發射的信號 • 111

  19. Reference signal • Pilot 作用:同步、channel estimation • Pilot種類:scatter pilot、continual pilot、TPS • Scatter pilot和continual pilot的值都由PRBS( pseudo random number sequence)產生 • PRBS產生reference sequence,其值加到pilot上使pilot成為reference signal

  20. PRBS sequence

  21. Scatter pilot 位置 • 位置：不固定,但有週期性

  22. Continual pilot 位置 • 位置:有固定的地方

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