EBU – TECH 3348 Frequency and Network Planning Aspects of DVB-T2 Status: Report Geneva May 2011 1 Page intentionally left blank. This document is paginated for two-sided printing EBU Tech 3348 Frequency & Network Planning Aspects of DVB-T2 Contents 1. Introduction ...................................................................................... 7 1.1 Commercial requirements for DVB-T2 ............................................................................ 7 1.2 DVB-T and DVB-T2; what is the difference?...................................................................... 8 1.3 Notes on this report.................................................................................................. 8 2. System properties ............................................................................... 9 2.1 Bandwidth ............................................................................................................. 9 2.2 FFT size ................................................................................................................ 9 2.3 Modulation scheme and guard interval ..........................................................................10 2.4 Available data rate..................................................................................................11 2.5 C/N values ............................................................................................................13 2.6 Rotated constellation...............................................................................................18 2.6.1 Concept .................................................................................................................... 18 2.6.2 Constellation Diagram ................................................................................................... 18 2.6.3 Rotation of the constellation diagram ................................................................................ 18 2.6.4 Rotation angle............................................................................................................. 19 2.6.5 Time delay between I and Q............................................................................................ 19 2.6.6 Improvement of performance .......................................................................................... 20 2.7 Scattered pilot patterns............................................................................................20 2.8 Time interleaving....................................................................................................21 2.9 Bandwidth extension................................................................................................21 2.10 Phase noise ...........................................................................................................22 2.11 Choice of System Parameters .....................................................................................23 2.11.1 Choice of FFT size ........................................................................................................ 23 2.11.2 Selection of DVB-T2 mode for SFNs.................................................................................... 23 3. Receiver properties, sharing and compatibility, network planning parameters......24 3.1 Minimum receiver signal input levels ............................................................................24 3.2 Signal levels for planning...........................................................................................25 3.3 Examples of signal levels for planning ...........................................................................26 3.3.1 DVB-T2 in Band III ........................................................................................................ 27 3.3.2 DVB-T2 in Band IV/V ..................................................................................................... 28 3.4 Protection ratios.....................................................................................................29 4. New planning features .........................................................................30 4.1 SFN Extension ........................................................................................................30 4.2 Degradation beyond guard interval...............................................................................31 4.2.1 Use of higher FFT modes ................................................................................................ 31 4.2.2 DVB-T2 equalisation interval, EI ....................................................................................... 33 4.3 MISO (Multiple Input Single Output) ..............................................................................36 4.3.1 General considerations .................................................................................................. 36 4.3.2 Transmission Parameter Considerations .............................................................................. 37 4.3.3 Planning Applications and Considerations ............................................................................ 37 4.3.4 Qualitative description of the MISO gain.............................................................................. 39 3 Frequency & Network Planning Aspects of DVB-T2 EBU Tech 3348 4.3.5 Example of MISO coverage gain......................................................................................... 39 4.4 Time-Frequency Slicing (TFS) .....................................................................................40 4.4.1 TFS in the DVB-T2 standard ............................................................................................. 40 4.4.2 The TFS concept .......................................................................................................... 40 4.4.3 TFS gains ................................................................................................................... 41 4.4.4 TFS coverage gain......................................................................................................... 42 4.4.5 TFS interference gain .................................................................................................... 42 4.4.6 Improved robustness ..................................................................................................... 42 4.4.7 Calculation of potential TFS coverage gain - example.............................................................. 42 4.4.8 Coherent Coverage Effects .............................................................................................. 44 4.5 Time Slicing ..........................................................................................................44 4.6 Physical Layer Pipes ................................................................................................44 4.6.1 Input streams and Physical Layer Pipes ............................................................................... 44 4.6.2 Single and multiple PLPs................................................................................................. 45 4.7 Peak-to-Average Power Ratio (PAPR) reduction techniques..................................................46 4.8 Future Extension Frames (FEF)....................................................................................47 5. Implementation Scenarios .................................................................... 48 5.1 Introduction ..........................................................................................................48 5.2 Scenario 1: MFN rooftop reception and a transition case.....................................................48 5.3 Scenario 2: SFN rooftop reception, maximum coverage ......................................................49 5.4 Scenario 3: SFN rooftop reception, moderate coverage ......................................................49 5.4.1 Scenario 3a: Rooftop reception for limited area SFN ............................................................... 50 5.4.2 Scenario 3b: Rooftop reception for large area SFNs................................................................. 50 5.5 Scenario 4: Portable reception (maximum data rate).........................................................50 5.6 Scenario 5: Portable reception (maximum coverage area extension) ......................................51 5.7 Scenario 6: Portable reception (optimal spectrum usage)....................................................52 5.8 Scenario 7: Mobile reception (1.7 MHz bandwidth in Band III)...............................................52 5.9 Scenario 8: Portable and mobile reception (common MUX usage by different services) – Multiple PLP53 5.10 Overview of scenarios ..............................................................................................54 6. Transition to DVB-T2 .......................................................................... 55 6.1 DVB-T2 in GE06 ......................................................................................................55 6.1.1 Implementing alternative broadcasting transmission systems under the GE06 Agreement ................... 55 6.1.2 Requirements for the development of the DVB-T2 specification.................................................. 55 6.1.3 Implementation of DVB-T2 in the GE06 Plan ......................................................................... 55 6.2 Transition scenarios.................................................................................................57