Discussion:
Ananalysis of a LOS Microwave link & link budget parameters
Q: A microwave line of sight link has a single hop with the following parameters:
Transmit power 5 W
Transmit and receive antenna gain 38 dB
Length of link 40 km
Transmission frequency 10 GHz
All losses 3 dB
Receive system noise bandwidth 30 MHz
System noise temperature in clear air 600 K
a. Calculate the path loss Lp for the link. Remember to put R in meters.
b. Calculate the power received Pr, by the receiving terminal.
c. Calculate the noise power, N, in the receiver, in dBW. Hence find the CNR in the receiver in clear air conditions.
d. Multipath can cause the signal to fall by 40 dB. What is CNR in the receiver when this happens? Can the link maintain BER < 10^-6 using QPSK modulation with an implementation margin of 1.0 dB?
e. How can multipath fading can be mitigated in a line of sight (LOS) link? Describe one method.