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Understanding TPS Modulation and System Performance in DVB Standards

This document explores the differential modulation of TPS carriers in DVB systems, specifically focusing on the modulation rules for carrier k in relation to the reference sequence. It discusses the reserved TPS bits for future use, such as in DVB-H, and provides detailed performance simulations for 8 MHz channels, including fixed reception specifications. Additionally, the definitions of Rayleigh and Ricean channels are outlined, examining the impacts of different Ricean factors on system performance and interleaving processes.

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Understanding TPS Modulation and System Performance in DVB Standards

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  1. DVB 老師：高永安 學生：林柏廷

  2. Outline • Promblem • AnnexA-D

  3. Problem TPS modulation • the following rule applies for the differential modulation of carrier k of symbol l( l>0) in frame m： • The absolute modulation of the TPS carriers in the first symbol(S0) in a frame is derived from the reference sequence wk as follows:

  4. Problem • TPS部分bite為reserved的原因是為了提供未來使用，如DVB-H。

  5. Annex A Simulated system performance for 8 MHz channels

  6. Annex A Simulated system performance for 8 MHz channels

  7. Annex A Simulated system performance for 8 MHz channels

  8. a) Fixed reception F1: where: - the first term before the sum represents the line of sight ray; - N is the number of echoes equals to 20; - θi is the phase shift from scattering of the i'th path - ρi is the attenuation of the i'th path - τi is the relative delay of the i'th path Annex B Definition of P1(Rayleigh channel) and F1(Ricean channel)

  9. Annex B Definition of P1(Rayleigh channel) and F1(Ricean channel) • The Ricean factor K is given as: • In the simulations a Ricean factor K = 10 dB has been used. In this case:

  10. Annex B Definition of P1(Rayleigh channel) and F1(Ricean channel) • b) Rayleigh fading(P1)： Where：

  11. Annex B Definition of P1(Rayleigh channel) and F1(Ricean channel)

  12. Annex C Interleaving example The first symbol in a superframe，2K mode、 64-QAM、 non-hierarchical transmission，when the input bits to the bit interleaver are numbered 0 to 9071(1512*6=9072)：

  13. Annex D Values for 6MHz channels • Parameter： Bw ：COFDM使用的頻寬 V ：使用調變的位元流大小 Gr ：GI Ratio Ck ：C2k=1512/1705，C8k=6048/6817 Cr：Code rate Rs ：188/204 Useful BitRate(Mbit/s)

  14. Annex D Values for 6MHz channels

  15. Annex D Values for 6MHz channels

  16. Subcarriers 相關位置

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