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FCC PART 15, SUBPART C, SEC. 15.247 - DIRECT SEQUENCE SPREAD SPECTRUM TRANSMITTERS
PCMCIA Wireless LAN Card, Model WL-211F
1000 BYTE PER VS. ES/NO
11 Mbps CCK in Thermal Noise
0
10
-1
10
-2
10
15.5
16
Es/No (dB)
The reference PER is specified as 8% . The corresponding Es/No (signal to noise ratio per symbol) is
16.4 dB. The Es/No required to achieve the desired BER with maximum system implementation
losses is 18.4 dB. The minimum processing gain is again, 10 dB, therefore:
E
=
+
s
G
p
N
o
output
J
=
+
G
18
4 .
dB
p
S
The minimum jammer to signal ratio is as follows:
J
≥
−
8
4 .
dB
S
For the case of the HFA3861A, the bit rates are 1, 2, 5.5, and 11 Mbps. The corresponding symbol
rates are 1, 1, 1.375, and 1.375 MSps. The chip rate is always 11 MCps, so the ratio of chip rate to
symbol rate is 11:1 for the 1 and 2 Mbps rates and 8:1 for the 5.5 and 11 Mbps rates. Since the
symbol rate to bit rate is less than 10 for the higher rates, we supply the theoretical processing gain
ULTRATECH GROUP OF LABS
3000 Bristol Circle, Oakville, Ontario, Canada L6H 6G4
Tel. #: 905-829-1570, Fax. #: 905-829-8050, Email: vhk.ultratech@sympatico.ca, Website: http://www.ultratech-labs.com
•
Assessed by ITI (UK) Competent Body, NVLAP (USA) Accreditation Body & ACA/AUSTEL (Australia)
•
Accredited by Industry Canada (Canada) under ACC-LAB (Europe/Canada MRA)
•
Recognized/Listed by FCC (USA )
•
All test results contained in this engineering test report are traceable to National Institute of Standards and Technology (NIST)
16.5
17
J
+
=
L
16
4 .
dB
system
S
≥
10
dB
J
+
+
≥
2
0 .
dB
10
S
FCC ID: MXF-WL211F
dB
File #: GTT-013FTX
Page 49
March 17, 2000
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