Inst IQ Ref Spec (802.11b/g DSSS/CCK/PBCC)

When 802.11b/g DSSS Direct sequence spread spectrum. The data transmission scheme (sometimes referred to as a "'modulation" scheme) used in 802.11b WLANs. DSSS uses a radio transmitter operating at a fixed centre frequency, but using a relatively broad range of frequencies, to spread data transmissions over a fixed range of the frequency band. 802.11a and 802.11g (when not operating in 802.11b mode) use Orthogonal Frequency Division Multiplexing (OFDM)./CCK complementary code keying/PBCC packet binary convolutional code Demodulation is enabled, the Inst IQ Ref Spec trace is the instantaneous spectrum of the IQ Ref Time signal. It is the non-averaged IQ Ref Spec trace data.

The VSA's digital demodulator removes carrier-frequency error. Therefore, in the error vector spectrum display, you must add the carrier-frequency error to marker readouts to obtain input signals frequency information. The carrier-frequency error (Freq Err) is shown in the symbol table.