802.11b/g Demod Properties Dialog Box
The 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 (Wireless LAN Local Area Network: A communications network that serves users within a local geographical area, typically over distances of around 100m. Wireless LANs use wireless communicaitons to network devices so there is no need for data cabling. - Direct Sequence A process of spectrum spreading where the digital information stream is multiplied, using an exclusive OR technique, by a high speed pseudorandom code (spreading sequence) to generate a spread spectrum signal. Spread Spectrum) Demodulation dialog box contains parameters that configure the VSA to demodulate 802.11b/g DSSS/CCK/PBCC modulated signals.
The 802.11b/g DSSS/CCK/PBCC Demodulator must be selected before this dialog box is available.
The dialog box contains these tabs:
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Advanced Tab: Specifies advanced parameters including Chip Rate, Clock Adjustment, Equalize filter, Descramble Mode select, Normalize IQ Traces, and Mirror Frequency Spectrum select.
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Filter Tab: Specifies a reference filter to be used in demodulation.
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Format Tab: Specifies the 802.11b/g DSSS/CCK/PBCC demod configuration parameters including: Preset to Standard and Data Modulation Format properties.
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Time Tab: Specifies the signal capture configuration parameters. These parameters are used to select the pulse search length and to isolate a segment of the time record for further viewing and data analysis. The parameters include: Search Length, Result Length, Measurement Offset, and Measurement Interval parameters.
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