In: Electrical Engineering
a) determine the critical distance for the two-ray
model in an urban microcell (ht=10m, hr=3m) and an indoor microcell
(ht=3m, hr=2m) for fc=2GHz. What are the practical implications of
your obtained values
b) Consider an indoor wireless LAN with fc=900MHz, cells of radius
100m, and none-directional antennas. Under the free-space path lost
model, what transmit power is required at the access point such
that all terminals within the cell receive a minimum power of 10uW.
How does this change if the system frequency is 5GHz.
c) The transmission power of a wireless system is 40W, under a
free-space propagation model. 1) what is the transmission power in
unit of dBm 2) The receiver is in a distance of 1000m, what is the
receiver power, assuming that the carrier frequency fc=900MHz and
Gt=Gr=0dB 3) Express the free space path lost in dB