CTE CTE Wireless & RF Engineering

Question 1

What is the Friis transmission equation used to calculate in RF engineering?

Accepted Answer

Received power in a line-of-sight link given transmit power and antenna gains

Answer

Signal attenuation due to rain

Answer

Noise figure of a receiver chain

Answer

Impedance mismatch between antenna and feedline

Question 2

Which modulation scheme provides the highest spectral efficiency in a wireless link?

Accepted Answer

256-QAM

Answer

BPSK

Answer

QPSK

Answer

16-QAM

Question 3

What does VSWR measure in an antenna system?

Accepted Answer

Impedance mismatch between transmission line and antenna

Answer

Antenna gain over an isotropic radiator

Answer

Doppler shift at the receiver

Answer

Effective radiated power

Question 4

In cellular network planning, what is the primary purpose of frequency reuse?

Accepted Answer

To increase network capacity by using the same frequencies in non-adjacent cells

Answer

To reduce transmit power in each cell

Answer

To eliminate multipath fading

Answer

To comply with FCC band allocation rules

Question 5

Which multiple access technology does LTE use on the downlink?

Accepted Answer

OFDMA

Answer

TDMA

Answer

CDMA

Answer

FDMA

Question 6

What is the typical frequency range for the C-band used in fixed satellite services in the United States?

Accepted Answer

3.7 GHz – 4.2 GHz (downlink) / 5.925 GHz – 6.425 GHz (uplink)

Answer

500 MHz – 1 GHz

Answer

1 GHz – 2 GHz

Answer

10 GHz – 12 GHz