9.5 Tools for Link Budget Calculations
Any science pocket calculator will do fine, but it is preferable to us a spreadsheet type of link budget calculator, such as the example in Tables 9.3 and 9.4. Most of my tools are done using standard Excel for windows. Dedicated tools for link budget calculations are available, but the flexibility of a standard Excel spreadsheet makes it very easy to upgrade and maintain. You can easily integrate the results of other calculations, such as cascaded noise (as shown in Table 9.2) or power per carrier, into your link budget tool if it is all based on Excel.
MS transmitter | ||
MS Tx power | 33 | dBm |
MS antenna gain | 0 | dBi |
EiRP | 33 | dBm |
DAS receiver | ||
BS noise figure | 3 | dB |
DAS noise figure | 0 | dB |
DAS passive loss | 35 | dB |
System noise figure | 38 | dB |
Thermal noise floor | −121 | dBm |
Interference | −120 | dBm |
Service SNR requirement | 9 | dB |
DAS antenna gain | 2 | dBi |
BS sensitivity | −76 | dBm |
The RF channel | ||
Log-normal shadow fading | 10 | dB |
Multipath fading margin | 6 | dB |
Body loss | 3 | dB |
Total margin | 19 | dB |
Rx minimum level | −57.0 | dBm |
Maximum allowable path loss | 90 | dB |
Service radius from antenna | 23 | m |
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