Using a Standard Setup (802.11b/g DSSS/CCK/PBCC)
Using a Standard Setup selects a 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) modulation standard preset configuration. When is selected, the VSA automatically sets the parameters shown in the following table:
The 802.11b/g DSSS/CCK/PBCC Demodulator must be selected before these Standard Presets are available.
|
DSSS/CCK/PBCC Preset to Standard |
|
|---|---|
|
Property |
|
|
Span |
34.375 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second. |
|
Data Modulation Format |
Automatic |
| Reference Filter | Rectangular |
| Alpha/BT Bandwidth Time Product | 0.5 |
|
Search Length |
1 msec |
|
Result Length |
Automatic (2816 chips Max) |
|
Measurement Offset |
22 chips |
|
Measurement Interval |
2794 chips |
|
Normalize IQ Traces |
ON |
|
Mirror Frequency Spectrum |
OFF |
| Track Phase | OFF |
|
Chip Rate |
11 MHz |
|
Clock Adjustment |
0 chips |
|
Equalize |
OFF |
|
Equalize Filter Length |
21 chips |
| Descramble Mode | On |
See Also
Setting Up a Measurement (802.11b/g DSSS/CCK/PBCC)
