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NETWORK CONFIGURATIONS _______ BR Seminar 18-19 September 2003

NETWORK CONFIGURATIONS _______ BR Seminar 18-19 September 2003. Jean-Jacques GUITOT ANFR - DPSAI – Dépt Planification – Etudes prospectives Guitot@anfr.fr. Which Reception Mode?. Fixed?. HDTV ou portable?. Mobile?. Portable outdoor or indoor?. Hand portable?.

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NETWORK CONFIGURATIONS _______ BR Seminar 18-19 September 2003

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  1. NETWORK CONFIGURATIONS_______BR Seminar 18-19 September 2003 Jean-Jacques GUITOT ANFR - DPSAI – Dépt Planification – Etudes prospectives Guitot@anfr.fr

  2. Which Reception Mode? Fixed? HDTV ou portable? Mobile? Portable outdoor or indoor? Hand portable?

  3. Minimum required field strength Illustration of scheme of different receiving conditions for DVB-T DVB-T Transmitter Rice channel Rayleigh channel Rayleigh channel ---------- 10m ---------- 10m Location correction factor = 9dB Height loss dB Height loss dB ---------- 10m Location Correction factor = 9.1 or 13 dB Penetration loss dB Location Correction factor = 4dB ---------- 1,5m ---------- 1,5m (C/N)m (C/N)f (C/N)p Portable reception Mobile reception Fixed reception

  4. Minimum required field strength Minimum median equivalent field strength for a location probability of 95% of locations • +4dB for 99% of locations • + 11 to 15 dB for indoor coverage

  5. Illustration of services(source Jorn Andersen DK)

  6. Which coverage? • Size of service area • Shape of service area • Percentage of Location probability

  7. Which DTTB Systems? • OFDM, VSB • If OFDM : 2 k, 8K • System variants • Hierarchical , non-hierarchical modulation • QPSK, 16 QAM, 64 QAM • Code rate • bitrate

  8. Which Network Configuration? • MFN : Multi Frequency Network • different frequencies assigned to each site • Coverage provided by a transmitter • SFN : Single Frequency Network • The same frequency assigned to each site • Synchronised • Same content • Self interference to be taken into account for portable and mobile (size limited) • Every transmitter contribute to provide the coverage and cannot operate independently

  9. Which choice of network? • Network Configuration • MFN, SFN • With technical parameters to be taken into account • Antenna height • Antenna directivity • E.r.p. • Distance between sites for MFN or SFN • Re-use of existing sites; • Re-use of existing sites and creation of sites • Complete creation of sites For providing a service coverage

  10. Process for a choice of network imply DTTB Service Reception mode Reception Coverage (% location probability) System; 2K or 8 K, Variant Hierarchical; non-hierarchical Optimisation of network choice Network configuration

  11. Network Configurations in Planning • Configuration modes • MFN • SFN With technical parameters • Antenna heights • Antenna patterns • E.R.P. • Distance between sites and /or • Width and shape of service area

  12. Configurations modes in Planning • MFN : • SFN : implementation by • Few high power stations • More stations but lower radiated power • Main stations complemented by gap-filler (low power stations) • Mixed MFN and SFN • In a same country some coverage are provided by MFN and by SFN • In adjacent countries, one is implementing MFN type, the other SFN type

  13. MFN (and gap-filler SFN)

  14. SFN ·       synchronous signal ·        same RF channel ·         same content

  15. SFN parameters • Guard interval • has a major implication on the topology of SFN implementation • Duration governs the maximum echoes delay admissible by the system : maximum possible distance between co-channel transmitters • More or less Large SFN

  16. OFDM signal parameters That for non-directive antenna

  17. SFN Reference structure (Open or Closed)

  18. MFN Reference structure

  19. Frequency Planning • Take into account requirements to describe configuration networks • Use technical bases for calculation • Transmitter distances between co-channel for MFN • Separation distances between SFN

  20. Thank you for your attention…

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