Week 7

Question 1

Explain Fresnel zone

Answer 1

Fresnel zone is used to explain how the RF signal is spread and received by the antenna.

Contain 2 zone,1FZ, 2FZ

If >40% of 1FZ block, performance suffer, link fail

Question 2

Whats is FSPL and how it work

Answer 2

Free space path loss

Calculate loss of signal strength through free space

FSPL= 20log10(d) +20log(f) + 32.44

d= distance between transmitter n receiver in m
F= frequency in Hz

Question 3

Explain diversity antennas

Answer 3

Multiple antenna used to improve reliability of network. Reduce fading, interference and signal dropout.

Spatial diversity, assuming in an area, some place have wavelength issue while possible other part does not face it

Question 4

Explain MIMO

Answer 4

Multiple input Multiple Output

Use multiple antenna to increase throughput, efficiency

Uses spatial multiplexing and beam forming

Question 5

Explain spatial multiplexing and beam forming

Answer 5

Through spatial multiplexing, receiver can compare signals, and connect to stronger signals

Beamforming is more towards focusing the energy towards the transmitter

Question 6

Use of omni directional antenna

Answer 6

Create a point to multipoint bridge link

Radiate signal power uniformly in direction of horizontal plane, ideal for broad coverage