[Advanced Communication System] Exams Solved
Transcript of [Advanced Communication System] Exams Solved
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Final 2013
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ii-
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Final 2012
Note 1, pages 19-22, 26-35
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Small-Scale fading
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2-
Log-Normal Shadowing
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3-
Knife-Edge [غى
]
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2-ray proof as in 2013 (i)
The signal nulls at the receiver: (Note 1, Page 14)
Final expressions: (Midterm Exams Solutions by Yahia page 1)
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Midterm Exams Solutions by Yahia pages 5, 6
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Final 2011
Same as 2013 above ↟↟↟↟↟
Final 2010
Same as 2012 © ↟↟↟↟↟↟↟
Final 2009
Same as 2013 (i)
Same as 2014 (i) and 2013 (ii)
Final 2008
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Same as 2013 (i)
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Same as 2014 (i) and 2013 (ii)
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2- Spherical earth & Refraction
Final 2014
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و ريينس كرة ب خف رق م ب عت ر نير
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Ch.4: Diversity and Equalization Final 2014
i-
Note 3 from (20 to 23)
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Note 3 Pages (23 and 25)
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Final 2013
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Repeated
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Repeated
Final 2010
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Note 3 from (18 to 20)
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ii-
Repeated
iii-
Repeated
Final 2009
A-
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Repeated
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Repeated
B-
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Repeated
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Repeated
iii.
Repeated
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Ch.5: Spread Spectrum Techniques
1- Codes
Final 2014
b)زكرة
8قبل يدير
i)
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c) بد يدير00زكرة
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Final 2012
M-sequence ( قبل يدير7زكرة)
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Walsh codes ( قبل ي8زكرة )
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OVSF code ( قبل ي8زكرة )
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Gold code ( قبل ي8زكرة )
Properties and usage: explained in 2014 above ..
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Final 2011
b)زكرة
8قبل ي
i) explained previously in 2012,2014
ii) No of orthogonal codes -MAI- jamming (not sure)
iii) Walsh 64 : in IS-95 CDMA1 , Gold code : UMTS (3g)-GPS-LTE
c) قبل ي7زكرة
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Final 2009
Final 2008
a)
M-sequence: used in CDMA applications
Walsh 64: used in IS-95 CDMA1
Gold code: used in UMTS (3g)- GPS -LTE
OVSF: used in UMTS
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2- DSSS
Solution
i-Note (1) page [6 to 12]
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ii- Note (1) page [16]
Solution
a.i) Note [1] page [6 to 14]
Repeated
iii)
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Solution
ii) Note [1] page [6 to 14]
Repeated
Solution
b) Note [1] page [6 to 14]
The same as the first question + this figure
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c) Note [1] page [18 + 20 + 21 + 22]
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Solution
a) Note [1] page [6 to 14]
Repeated
Solution
A) Note [1] page [6 to 14]
Repeated
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3- FHSS
Final 2014
From 2015 Summary Ch.5
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Final 2013
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Final 2012
Repeated Final 2013 (ii)
Repeated Final 2013, C
Final 2011
Repeated Final 2013 (ii)
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Repeated Final 2013, C
Repeated Final 2012, B
Final 2010
Final 2008
Repeated Final 2012, C
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Ch.7: OFDM/MA Techniques
Final 2014
Final 2013:
Final 2012
Final 2011
Notes 3, page 8 and 9 or Revision of Eng. El Fikey Engybook page 50
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i. Sub-carrier Frequency spacing needed to achieve orthogonality
ii.
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Advantages of CP
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iii.
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Methods to decrease it :
iv. We can’t use OFDM in uplink as a reason of the PAPR, and it’s only
solution to increase the efficiency is to use Class A Amplifiers with ἠ = 25%, so we
will use more power and battery will die (Mobile phone battery)
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Ch.X:
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Final 2011
Note 9 Page 41, 42 in pdf
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Appendix
A) Q-function Table
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B) Radar Probability of Detection Curve