The resultant standard deviation is calculated as follows = wanted interferer σ σ Fixed antenna reception (10 m above ground level) The aggregate standard deviation, is 5.5 dB, which makes the resultant standard deviation, σ = × 5.5 = 7.8 dB. σres Portable indoor ground floor reception The aggregate standard deviation, is 6.3 dB, making the resultant standard deviation, σ = × 6.3 = 8.9 dB. σres Calculation of location correction margin Table A2.2 gives the Band III location correction margin which has to be added to the system protection ratios in Tables A2.3 to A2.6 to determine if the wanted signal is protected at the desired percentage of locations (location probability). It should be noted that the indicated values are also valid for Bands IV and V (see Recommendation ITU-R BT.1546 Annex 5, § 12, Table 2). Annex 2 Reference: Joint ERC/EBU Report on Planning and Introduction of Terrestrial Digital Television in Europe, Izmir, December 1997 Effective Protection Target, EPT Rayleigh statistics is assumed for the propagation channel for portable or mobile reception cases and thus the respective value is applied in planning. For fixed reception, basically a Ricean C/N channel is assumed. But also in fixed reception, the channel may become less favourable, especially if active echoes other transmitters of the same SFN cannot be attenuated substantially by the – – directional antenna at the receiving point. A smooth transition between the application of the Rice and Rayleigh value to be applied for the is described by the protection target” (EPT). C/N “effective In this concept, there is a criticality” parameter, defined as the ratio of the power of “channel KA, the main signal compared to the power sum of the artificial echoes. Interpolation between the Rice and the Rayleigh value of depends on this parameter. If the main signal dominates, the Rice C/N statistics is assumed, while if the ratio is balanced, Rayleigh statistics is assumed. The calculation of the EPT is given in formula (1) With: EPT: effective protection target (dB) : for Ricean channel (dB) C/N : for Rayleigh channel (dB) C/N
The resultant standard deviation is calculated as follows σ wanted = σ interferer Fixed antenna reception (10 m above ground level) The aggregate standard deviation, σ is 5.5 dB, which makes the resultant standard deviation, σres = × 5.5 = 7.8 dB. Portable indoor ground floor reception The aggregate standard deviation, σ is 6.3 dB, making the resultant standard deviation, σres = × 6.3 = 8.9 dB. Calculation of location correction margin Table A2.2 gives the Band III location correction margin which has to be added to the system protection ratios in Tables A2.3 to A2.6 to determine if the wanted signal is protected at the desired percentage of locations (location probability). It should be noted that the indicated values are also valid for Bands IV and V (see Recommendation ITU-R BT.1546 Annex 5, § 12, Table 2). Annex 2 Reference: Joint ERC/EBU Report on Planning and Introduction of Terrestrial Digital Television in Europe, Izmir, December 1997 Effective Protection Target, EPT Rayleigh statistics is assumed for the propagation channel for portable or mobile reception cases and thus the respective C/N value is applied in planning. For fixed reception, basically a Ricean channel is assumed. But also in fixed reception, the channel may become less favourable, especially if active echoes – other transmitters of the same SFN – cannot be attenuated substantially by the directional antenna at the receiving point. A smooth transition between the application of the Rice and Rayleigh value to be applied for the C/N is described by the “effective protection target” (EPT). In this concept, there is a “channel criticality” parameter, KA, defined as the ratio of the power of the main signal compared to the power sum of the artificial echoes. Interpolation between the Rice and the Rayleigh value of C/N depends on this parameter. If the main signal dominates, the Rice statistics is assumed, while if the ratio is balanced, Rayleigh statistics is assumed. The calculation of the EPT is given in formula (1) With: EPT: effective protection target (dB) : C/N for Ricean channel (dB) : C/N for Rayleigh channel (dB)