mobile cell 3a
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7/22/2019 Mobile Cell 3a
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Dr. Moshe Ran/ 31
"
,..MostlyTek Ltd "
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3
]-Large Scale]9 ,3 ,
,))scattering,))diffraction,)(reflection: ,))LOS ,))NLOS
))outdoor cost231,Okumura, HataWalfish and Bertoni , ,))Indoor ,
,Ray Tracing models
2
]] :6 , ,))frequency-reuse
, ,ACI ,CCI,))handoff Erlang , GOS , . .
1
]] :3 ., ,
, ,(,., ,,)
, ,. ,, .
.
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(- 4 Small Scale9( ,))multipath,
: ,delay spread,-Doppler spread
Saleh and Valenzuela )Indoor(,SUI,ITU-B)) :3 5
,),( SSB,DSB,))AM:
: - ).)FM,))PM,PPM,PDM,PAM:PFM,PCM, )Delta Modulation(
,:BPSK, DPSK, QPSK, O-QPSK 6: .:FSK, MSK, GMSK
M-PSK, M-QAM, M-FSK. ).)OFDM- Spread-Spectrum
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]]6 7
,))Multiple Access FDMA TDMA, FHMA .OFDMA, MC-CDMA ,CDMA
.
8
))3 ))Link Budget . .,
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Large Scale Models :3
,Large Scale : 1.vs. Small Scale Models
((LOS 2.Friis
((reflection3.diffraction)(,(scattering)
4. ((NLOS
((outdoor 5.
((Indoor 6.
. 7.
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.1 Input-Output .
" " : , ,
""?! ((Radio Transmission Technology
:
: ,.
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Large Scale vs. Small Scale Models
,,:
((Equalization,,diversity")("
,,1800MHz2400MHz)900MHz 3.5GHz,5GHz,10.5GHz,28GHz'(
/Large Scale, -Small Scale,
OutdoorIndoor
LOSNLOS
.
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)( :
: 1. =PL ,(large scale models slowfading)
LOS(Free-space, Friis model)
(NLOS(log-normal shadowing
:2. , (small scale fading)
.4 :Cell-site Engineering , ,
outage probability, etc
2/PL k d =
/ 2d
2
( / ) ; 2 to 5,
(0, ); 6 to 12
n
PL k d X n
X N = + =
=
/ 2d
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NLOS /
: NLOS .:((Reflections .',, : . , ..:((Diffraction . ..:((Scattering
.),,(
NLOS )LOS, (
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Example of Multipath Fading Channel
.1Uncorrelated path statistics
.2Large scale (slow) versus small scale (fast) fading
.3Gaussian statistics
Shadowing
Base
Station
1Path
2Path
time t time t +
Mobile
Base
station
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"
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((LOS .2
Pt [Watts] Pr [Watts] df..
C=3x108 m/sec
2
2
( )(4 / )
1
(4 / )
tr
t
PP d
d
Pdf c
= =
cf
=
=0.1 m,f=3Ghz
-
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. (LOS) . , fd :,.
Pt PrPr/Pt PL (Path loss)
22
4 4
r
t
P cPLP d df
= = =
,, PL6dB PL20dB 10
Friisfree space model
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0
P10log 32.4 20log 20log
27.6 20log 20log
r
t
d fL
P km MHz
d f
m MHz
= = =
+ =
150 dB144dB124 dBf=38GHz
126.4dB120.4dB100.4dBf=2.5GHz
118.4dB112.4dB92.4dBf=1GHz
d=20 kmd=10 kmd=1 km
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LOSGt ,Gr ,L
( )22
04 4
t r t r r
t
G G G GP cPL L
P L d L df
= = = =
LOS L0
P10log
10log 10log 10log 32.4 20log 20log
r
t
t r
LP
d fG G Lkm MHz
= =
+
)LOS(
Friis
P:r/P
t.
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PtGt EIRP. , (
) "
PtGt , (Gt (
.Pt
EIRP = Effective Isotropic Radiated Power
..
-3dB
,EIRP ,OBO
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EIRP
dBm50EIRP
dBi17TX antenna Gain
(60
o
x14
o
)
dB-2LOSS (cable,
duplexer)
dB-9Output Back Off
(OBO)
dBm
Watts
+44
25
BTS Power
Amplifier
unitsTX parameter
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-Friis dTx-Rx"" .Prd . "" Fraunhofer Region dF
22F
Dd
= D
,F Fd D d Large-ScalePL d0 d0>dF
20
0 0( ) ( )r r Fd
P d P d d d d d
=
0 010
( )( ) 10 log 20 log
1
rr dB m
P d dP d
mW d
= +
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: 900MHz50Watts.
) dBW dBm ) d=100m ,d=1000m.
.:
(3[ ] 10 log 10log(50 10 ) 47
1
tt
PP dBm dBm
mW
= = =
[ ] 10 log 10log(50) 171
tt
PP dBW dBW
W
= = =
(2 8 6 6 33 10 / 900 10(100) 50 3.5 10 3.5 104 4 100
24.56
r tP P W mW d
dBm
= = = =
=
100
(1000) (100) 20 log 24.56 20 44.561000r rP P dBm= + = =
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)(. ,-
: -.
)( .. " , . . , .
: )( ).(
.
/: . ,( . . )
.
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ENERGY PROPAGATION
S(W/m2) = E(V/m) x H(A/m)c = *f
+-
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Wave impedance
Rfs =Z = E/H = (0/0)1/2 = 120 = 377
- permeability(F/m) - permittivity(H/m)
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/
E=( EX
2 + EY
2 + EZ
2 )1/2X
Y
H=( HX2 + HY
2 + HZ2 )1/2
S=( EX2 + EY
2 + EZ2 )/377
Z
X
Z
Y
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Reactive near field.-Radiating near field (Fresnel).-Far field (fraunhofer).
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DR1
R2
D,
.
3
23
2
620
2620
2
Dr
Dr
D
D
r
LOSE-fieldd0 0 0| ( , ) | E dE d t
d
=
:0 0 '( ', ) cos( [ ])
'LOS c
E d dE d t t
d c=
0 0 ''( '', ) cos( [ ])''
g c
E d dE d t t
d c=
'd LOS
''d NLOSg i i
E E E= =
0 0 0 0' ''( , ) cos( [ ]) cos( [ ])' ''
TOT c cE d E dd dE d t t t
d c d c = +
2-ray:
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2 ray: 2"
''2sin
2 2 T RT R
h hd d
d
h hd
= =
0.3rad2
. Fresnel zone =4 T Rh hd
=
( )Scattering
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