Where 푑푟푒푓is the reference distance and d is the typical distance; here d is
300 meters.
To obtain the received power for different distances we need to have the
threshold power. (3.1623e-13w or -95dBm) is used as the threshold
received power compared with the known distance d.To calculate the
transmit power of each node we need to modify the transmission power
with the same factor in equation (3- 25 ) and the result is equation (3- 26 ).
푡푥__푝표푤푒푟 푑푟푒푓 =푑푟푑푒 2 푓²∗푡푥_푝표푤푒푟(푑)...... ........................... ( 3 -
26 )
As we can see, the ratio depends on squared distance ratio, and the 300
meters distance is the default distance and if we have less distance we can
decrease the power by the factor (dref /300)².
In order to eliminate the effect of signal interference, the
transmission power of Mosul400 node was reduced to a safe value and a
repeater device was used to compensate the power transmitted to a farther
node (Al-Adaia).
3.9.3 Assumptions
The assumptions made on experimental investigation are:
1. All the nodes (except the server) in a network are supposed to
generate traffic (FTP traffic) at any given time.
2. Multiple hops are used as required before arriving at the
destination.
3. All nodes, including the destination, are not mobile at any
time.
4. All the nodes are needed to supply with the necessary
boosters and high gain antennas to extend their ranges.