wireless communication tutorial questions

Jan 3, 2025Download as PPTX, PDF0 likes11 views

Dr Upena Dalal

tutorial

Question 1 (continued)
d) If 256 QAM modulation having a bit rate of 2 Megabits per
second in applied to the channel, will the modulation
undergo flat or frequency selective fading? Explain your
answer.
e) Over what bandwidth will the channel appear to have
constant gain?
𝑃 (𝜏 )=∑
𝑛=0
2
10
− 6
𝑛
2
+1
𝛿(𝜏 − 𝑛10−6
)

Question 3
What is the delay spread bound τmax of a 220 MHz radio
system if PT = 1 watt (+ 30 dBm) and PRmin = -90 dBm?
How much is τmax if sensitivity of the receiver is improved to
PRmin = -100 dBm? Why does increased sensitivity or
increased system gain, Gs = PT PRmin, lead to a higher delay
spread bound?

Question 4
Determine the proper spatial sampling interval required to make
small scale propagation measurement which assumes that
consecutive samples are highly correlated in time. How many
samples will be required over 10 m travel distance if Fc = 1900
MHz and v = 50 m/s? How long would it take to make these
measurements, assuming they could be done in real time from a
moving vehicle? What is the Doppler spread BD for the channel?

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wireless communication tutorial questions

1. Tutorial 3 Wireless and Mobile Communication SARDAR VALLABHBHAI NATIONAL INSTITUTE OF TECHNOLOGY SURAT

2. Question 1 a) Sketch the Power Delay Profile of the channel in dBm. b) What is the local average power in dBm? c) What is the rms delay spread of the channel? 𝑃 (𝜏 )=∑ 𝑛=0 2 10 − 6 𝑛 2 +1 𝛿(𝜏 − 𝑛10 −6 )

3. Question 1 (continued) d) If 256 QAM modulation having a bit rate of 2 Megabits per second in applied to the channel, will the modulation undergo flat or frequency selective fading? Explain your answer. e) Over what bandwidth will the channel appear to have constant gain? 𝑃 (𝜏 )=∑ 𝑛=0 2 10 − 6 𝑛 2 +1 𝛿(𝜏 − 𝑛10−6 )

4. Question 2 A local spatial average of a power delay profile is shown in Figure. a) Determine the rms delay spread and mean excess delay for the channel. b) Determine the maximum excess delay.

5. Question 2 (continued) A local spatial average of a power delay profile is shown in Figure. c) If the channel is to be used with a modulation that requires an equalizer whenever the symbol duration T is less than 10 σ t determine the maxim RF symbol rate that can be supported without requiring an equalizer.

6. Question 2 (continued) A local spatial average of a power delay profile is shown in Figure. d) If a mobile travelling at 30 km/h receives a signal through the channel, determine the time over which the channel appears stationary. Assume fc =900 MHz.

7. Question 3 What is the delay spread bound τmax of a 220 MHz radio system if PT = 1 watt (+ 30 dBm) and PRmin = -90 dBm? How much is τmax if sensitivity of the receiver is improved to PRmin = -100 dBm? Why does increased sensitivity or increased system gain, Gs = PT PRmin, lead to a higher delay spread bound?

8. Question 4 Determine the proper spatial sampling interval required to make small scale propagation measurement which assumes that consecutive samples are highly correlated in time. How many samples will be required over 10 m travel distance if Fc = 1900 MHz and v = 50 m/s? How long would it take to make these measurements, assuming they could be done in real time from a moving vehicle? What is the Doppler spread BD for the channel?

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