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FCC PART 15, SUBPART C, SEC. 15.247 - DIRECT SEQUENCE SPREAD SPECTRUM TRANSMITTERS
PCMCIA Wireless LAN Card, Model WL-211F
6.11. PROCESSING GAIN OF A DIRECT SEQUENCE SPREAD SPECTRUM, FCC CFR
47, PARA. 15.247(E)
6.11.1. Limits
The processing gain of a direct sequence system shall be at least 10 dB. The processing gain shall be determined from the
ratio in dB of the signal-to-noise ratio with the system spreading code turned off to the signal-to-noise ratio with the
system spreading code turned on, as measured at the demodulated output of the receiver.
6.11.2. Method of Measurements
Refer to Exhibit 8, Sec. 8.6 of this test report for detailed measurement procedures.
6.11.3. Theoretical Process Gain for CCK Modulation
This method is written by:
CARL ANDREN
INTERSIL CORPORATION
JANUARY 11, 2000
CANDREN@INTERSIL.COM
321-724-7535
In the case of CCK modulation at higher data rate, the Chip Rate/Symbol Rate (8 dB) is not an actual Process Gain since
it is a combination of both Process gain and Coding Gain. The formula true formula for Procssing Gain calculation will
be based on the CW Jamming Margin. Please refer to the attached theoretical Process Gain calculation written by Mr.
Carl Andren at Intersil Corporation for details.
SCOPE:
This report presents the test procedure, test configuration and test data associated with a FCC Part
15.247 (e) Jamming Margin test for the indirect measurement of processing gain.
APPLICABLE REFERENCE DOCUMENTS:
1. "Operation within the bands 902-928 MHz, 2400-2483.5, and 5725-5850 MHz" Title 47 Part 15
section 247 (e) Code of Federal Regulations. (47 CFR 15.247).
2. "Report and Order: Amendment of Parts 2 and 15 of the Commission's Rules Regarding Spread
Spectrum Transmitters. Appendix C: 'Guidance on Measurements for Direct Sequence Spread
Spectrum Systems" FCC 97-114. ET Docket No. 96-8, RM-8435, RM-8608, RM-8609.
3. "HFA3861A Direct Sequence Spread Spectrum Baseband Processor"
Semiconductor Sector Preliminary Data Sheet, Melbourne FL, July 1999.
4. " M-ary Orthogonal Keying BER Curve",
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)
Page 30
FCC ID: MXF-WL211F
Harris Corporation
File #: GTT-013FTX
March 17, 2000
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