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An Initial Study on the Convergence of DVB-H and DTMB in the Physical Layer

An Initial Study on the Convergence of DVB-H and DTMB in the Physical Layer. Feng Yang, Jian Song, Changyong Pan, Hui Yang, Kewu Peng, Jun Wang, Zhixing Yang Dept. EE Tsinghua University feng-yang04@mails.tsinghua.edu.cn. Brief Introduction of MING-T.

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An Initial Study on the Convergence of DVB-H and DTMB in the Physical Layer

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  1. An Initial Study on the Convergence of DVB-H and DTMB in the Physical Layer Feng Yang, Jian Song, Changyong Pan, Hui Yang, Kewu Peng, Jun Wang, Zhixing Yang Dept. EE Tsinghua University feng-yang04@mails.tsinghua.edu.cn

  2. ChinaCom2007 ShangHai Brief Introduction of MING-T • MING-T = Multistandard Integrated Network convergence for Global Mobile and Broadcast Technologies • Main Objectives of the Project • … • Incorporate both DVB-H and DTMB into the multi-standard framework. • ... from project management handbook • Convergence of DVB-H and DTMB

  3. ChinaCom2007 ShangHai Brief Introduction of MING-T (Cont’d) • Prototype using two demodulators • However, single chip is more attractive!

  4. ChinaCom2007 ShangHai Comparisons of DTMB & DVB-H • Randomization • Similarities • The same PRBS, the same initial state • Differences • Sync byte: DVB (untouched) DTMB (Randomized) • Reset: DVB (every 8 TS) DTMB (every signal frame)

  5. ChinaCom2007 ShangHai Comparisons of DTMB & DVB-H (Cont’d) • Forward Error Correcting (FEC) coding • DVB-H : RS + Convolutional code • RS(204,188) derived from RS(255,239) • Convolutional codes : 1/2, 2/3, 3/4, 5/6, 7/8 • DTMB : BCH + LDPC • BCH(762,752) derived from BCH(1023,1013) • LDPC with 3 code rates as the inner code

  6. ChinaCom2007 ShangHai Comparisons of DTMB & DVB-H (Cont’d) • Interleaving • Convolutional interleaving • DTMB: B=52 M=240/720 • DVB-H: B=12 M=17

  7. ChinaCom2007 ShangHai Comparisons of DTMB & DVB-H (Cont’d) • Interleaving • Block interleaving • DVB-H in-depth interleaver (8k) • DTMB frequency interleaver (4k)

  8. ChinaCom2007 ShangHai C-OFDM OFDM Symbol Copy Copy CP CP Data+Pilot Data+Pilot Signal Frame 500μs TDS-OFDM PN Data PN Data Comparisons of DTMB & DVB-H (Cont’d) • Frame Structure • C-OFDM : Process in Frequency domain • Parameter refresh : 1ms; Signal lock : 100ms • TDS-OFDM : Process in Time/Frequency domain • Channel estimation : 0.56 ms; Signal lock : 5ms

  9. ChinaCom2007 ShangHai Comparisons of DTMB & DVB-H (Cont’d) • Summary • TDS-OFDM vs C-OFDM, Using PN brings • Higher spectrum efficiency • Faster channel synchronization • BCH+LDPC vs RS+Convolutional code for better coding gain, therefore, lower Eb/N0 required for the same BER • Larger coverage • Better availability • Long time-domain interleaver • Better immunization to impulsive noise

  10. ChinaCom2007 ShangHai Receiver Algorithms & Convergence Considerations • Synchronization • Correlation approach • DTMB: correlating with the known PN sequence • DVB-H: guard interval correlation (pre-FFT syn.)

  11. ChinaCom2007 ShangHai Receiver Algorithms & Convergence Considerations (Cont’d) • Channel estimation & equalization • DVB-H: 8k FFT • DTMB: 8k FFT (channel estimation) 3780 FFT (equalization)

  12. ChinaCom2007 ShangHai Receiver Algorithms & Convergence Considerations (Cont’d) • De-interleaving • Convolutional de-interleaver • DTMB: B=52, M=720 • DVB-H: B=12, M=17 • Block de-interleaver • DVB-H: 8K • DTMB: 4K

  13. ChinaCom2007 ShangHai Receiver Algorithms & Convergence Considerations (Cont’d) • FEC decoder • DVB-H • Convolutional code: Viterbi Algorithm (VA) • RS code: syndrome computation, key-equation solver, Chien search and error evaluator • DTMB (LDPC) • Hard-decision : Bit-Flipping (BF) • Soft-decision : Sum-Product Algorithm (SPA)

  14. Thank you for your attention! Email: feng-yang04@mails.tsinghua.edu.cn

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