Exam text content

 

ELT-45106 RF eguipment for wireless networks
Final examination (Ari Asp)
6.2.2017 (calculator allowed)

You have to answer to all five (5) guestions.

g.

W

Explain shortly the following terms:
a) XPI and XPD ?
b) kTB
c) Y-factor method
d) Tapper
€) MDT and EDT
f) splitter

Why in diversity -methods it is always supposed that a channel is Rayleigh distributed case?

Explain IP3. Where will be 3. order intermodulation products, how fast they are
increasing, what will be bandwidth of them and how you can avoid them?

Explain next one formula. What are terms? Sketch a figure from this formula.

|F(SsZ)

[Fma]

Using the values given in following figure, calculate the noise figure, noise factor and total
eguivalent temperature of the system at the receiver output, after the 2. amplifier. If the gains of
amplifiers are switched (LNA Gain -> 15 dB and 2. Amp gain -> 20 dB ), what will happen to
the noise figure?

SSL, = 20108,

ANTENNA e LNA MIXER IF FILTER AMPLIFIER
cal

 

cable loss
=3dB = G=20dB Filterloss — G=15dB
Te=225K =4dB Te=527K

Figure 1. Reveiver structure

Note all the calculations.
Hint: