Why is it needed?
•To predict coverage between nodes in a wireless network
•Path loss is different from environment to environment, e.g., in-building is different to outdoors.
•Knowledge of path loss enables system parameters to be defined, e.g.,transmit power, receiver sensitivity and antenna gains.
•Path loss models include:
•Empirically based -obtained from measurements
•Analytical–solution of EM equations
•Simulation –e.g., based on ray tracing or FDTD