MOB Subject 2 –

Master of Computer Science 1 - MOB Mobile Computing

1/4 Baey, Fladenmuller – Subject 2

MOB Subject 2 – "Link budget " practical

What is the maximum propagation range you can get between a transmitter and a receiver? Using

one spreadsheet, you will try to understand the impacts of different parameters implied in the link

budget calculation.

Create an excel table like the one below. You have to generate automatically the answers in the

white boxes from the ones of the white boxes.

It is supposed that the operating frequency band is 2.4 GHz and that a margin of 10 dB is

sufficient.

The ART, a French standard regulation body, indicates that the EIRP should not exceed 100 mW.

Using the following command, indicate automatically on your spreadsheet if this condition is

verified:

IF: Returns one value if a condition you specify evaluates to TRUE and another value if it

evaluates to FALSE.

Syntax

IF(logical_test,value_if_true,value_if_false)

Transmitter Receiver Unit

Px: transmitter power 13 14,77 dBm

19,95 29,99 mW

Sx min with 11 Mbps -79 -85 dBm

Threshold of reception 12,59 3,16 pW

(10-12W)

-89 -94

Access point

Sx max with 1 Mbps

Threshold of reception 1,26 0,40

Cable L: loss 3 1

Antenna G: gain of antenna 7 6 dBi

Tx = Px – L + G Tx: EIRP 17 19,77 dBm

50,12 94,84 mW

Margin

Distance Max distance at 11 Mbps

Max distance at 1 Mbps

Based on this spreadsheet

Case 1: Transmitter and Receiver of Cisco traditional cards: