Using a Standard Setup (802.11a/g/j/p OFDM)
Selects a OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. OFDM is an alternative tranmission scheme to DSSS and FHSS. (Orthogonal Frequency Division Multiplexing) standard preset configuration. When a standard preset is selected, the VSA automatically sets the parameters shown in the following table:
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Available OFDM Standard Presets |
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|---|---|
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The 802.11a/g/j/p OFDM Demodulator must be selected before these Standard Presets are available.
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OFDM Standard Preset Configuration |
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|---|---|---|---|
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Parameter |
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Span |
31.25 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. |
31.25 MHz |
31.25 MHz |
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Data Subcarrier Modulation |
Automatic |
Automatic |
Automatic |
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Guard Interval |
1/4 (0.8 µs) |
1/4 (0.8 µs) |
1/4 (0.8 µs) |
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Synchronization Reference |
Short Training Sequence |
Channel Estimation Sequence |
Channel Estimation Sequence |
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Subcarrier Spacing |
312.5 kHz kiloHertz: A radio frequency measurement (one kilohertz = one thousand cycles per second). |
312.5 kHz |
312.5kHz |
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Symbol Time Adjustment |
-3.125% |
-3.125% |
-3.125% |
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Subcarrier Selection |
All |
All |
All |
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Pilot Tracking |
Track Phase |
Track Phase |
Track Phase |
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Equalizer Training |
Preamble Only |
Preamble Only |
Preamble Only |
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Normalize IQ Traces |
ON |
ON |
ON |
|
Search Length |
1 msec |
1 msec |
1 msec |
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Result Length |
Automatic 60 Symbols |
Automatic 60 Symbols |
Automatic 60 Symbols |
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Measurement Offset |
0 |
0 |
0 |
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Measurement Interval |
60 Symbols |
60 Symbols |
60 Symbols |
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Mirror Frequency |
Off |
Off |
Off |
See Also
802.11a/g/j/p Demod Properties
Selecting the 802.11a/g/j/p OFDM Demodulator
