Aironet BR2000-E Manuel d'utilisateur Page 18

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Vue de la page 17
CSE5501: MOBILE & DISTRIBUTED COMPUTING SYSTEMS
Lecture 3: Wireless LANs
18
Direct Sequence Spread Spectrum
Direct Sequence Spread Spectrum
Direct Sequence Spread Spectrum
DATA SIGNAL SPREAD BY A PN CODE
DATA SIGNAL SPREAD BY A PN CODE
PROPERTIES OF PN CODE
PROPERTIES OF PN CODE
CHIP RATE
CHIP RATE
DS PROCESSING GAIN
DS PROCESSING GAIN
PN CORRELATION AT RECEIVER
PN CORRELATION AT RECEIVER
PSK DATA MODULATION
PSK DATA MODULATION
G
G
P
P
(dB) = 10LOG (
(dB) = 10LOG (
CHIP RATE
CHIP RATE
DATA RATE
DATA RATE
)
)
AP96358 2
AP96358 2
-
-
11
11
FREQUENCY (MHz)
FREQUENCY (MHz)
CW SIGNAL
CW SIGNAL
AMPLITUDE
AMPLITUDE
(
(
dBm
dBm
)
)
SPREAD SIGNAL
SPREAD SIGNAL
AMPLITUDE
AMPLITUDE
(
(
dBm
dBm
)
)
2.45
2.45
2.44
2.44
2.43
2.43
2.46
2.46
2.47
2.47
1
1
0
0
DATA
DATA
BARKER
BARKER
CODE
CODE
SPREAD
SPREAD
DATA
DATA
CHIP
CHIP
CLOCK
CLOCK
0
0
3
3
6
6
9
9
12
12
15
15
18
18
0
0
0.2
0.2
0.4
0.4
0.6
0.6
0.8
0.8
1.0
1.0
1.2
1.2
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