Path Loss - University of Texas at Dallas
Path Loss
EE4367 Telecom. Switching & Transmission Prof. Murat Torlak
Radio Wave Propagation
The wireless radio channel puts fundamental limitations to the performance of wireless communications systems Radio channels are extremely random, and are not easily analyzed Modeling the radio channel is typically done in statistical fashion
EE4367 Telecom. Switching & Transmission Prof. Murat Torlak
Linear Path Loss
Suppose s(t) of power Pt is transmitted through a given channel The received signal r(t) of power Pr is averaged over any random variations due to shadowing. We define the linear path loss of the channel as the ratio of transmit power to receiver power
We define the path loss of the channel also in dB
EE4367 Telecom. Switching & Transmission Prof. Murat Torlak
Experimental results
The measurements and predictions for the receiving van driven along 19th St./Nash St.
Prediction with distance And transmission frequency
EE4367 Telecom. Switching & Transmission Prof. Murat Torlak
Line-of-Sight Propagation
Attenuation
The strength of a signal falls off with distance
Free Space Propagation
The transmitter and receiver have a clear line of sight path between them. No other sources of impairment! Satellite systems and microwave systems undergo free space propagation The free space power received by an antenna which is separated from a radiating antenna by a distance is given by Friis free space equation
EE4367 Telecom. Switching & Transmission Prof. Murat Torlak
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