COMPUTER NETWORKS AND COMMUNICATIONS
WIRELESS COMMUNICATION TECHNOLOGIES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Power Loss
|
|
|
Path Loss
|
|
|
Path factor
|
|
|
Noise figure
|
Detailed explanation-1: -Briefly put, the path loss model is used to calculate the mean signal attenuation, while fading/shadowing models are used to calculate the variance of the attenuation. All the path loss models except Log-distance are ‘fixed models’, which means that the model parameters are fixed theoretically.
Detailed explanation-2: -The received power level depends on the path loss. More the path loss, less is the available received power. We aim to reduce the path loss to maximize the power level available at the receiver.
Detailed explanation-3: -Fade Margins: The difference between the normal received power and the power required for minimum acceptable performance is referred to as the fade margin.
Detailed explanation-4: -In free space the path loss increases with 20 dB per decade (one decade is when the distance between the transmitter and the receiver increases ten times) or 6 dB per octave (one octave is when the distance between the transmitter and the receiver doubles).