Spectrum (802.11a/g/j/p OFDM)
When 802.11a/g/j/p 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. Demodulation is enabled, the trace is the averaged, Instantaneous Spectrum display, as shown in the following block diagram. If averaging is off, the and displays are identical.
The trace has the following characteristics:
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It is derived from pre-demodulated time data, which is 20% larger than the result length.
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It is averaged if averaging is ON and the average type is rms, rms exponential, or peak averaging.
If averaging is ON, a scan is not included in the average if any of these conditions exist: Pulse Not Found, Sync Not Found, Carrier Unlock, or certain DATA? conditions.
Measurement hardware signal flow (see Digital Demodulation Block Diagram):
See Also
