Preset To Standard (Custom OFDM)
IEEE Institute of Electrical and Electronics Engineers. A US-based membership organisation that includes engineers, scientists, and students in electronics and related fields. The IEEE developed the 802 series wired and wireless LAN standards. Visit the IEEE at http://www.ieee.org standard defined 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. signal. When a standard preset is Selected, the VSA automatically configures the OFDM demodulator to the parameters shown in the following table:
is used to configure the VSA to measure an
Available OFDM Standard Presets |
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VSA configured to measure a standard IEEE 802.11a compliant signal. |
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VSA configured to measure standard IEEE 802.11ah compliant signals: 1 MHz Megahertz: A unit of frequency equal to one million hertz or cycles per second., 2 MHz, 4 MHz, 8 MHz, and 16 MHz. |
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VSA configured to measure standard Digital Audio Broadcasting signals: Mode I, Mode II, Mode III, and Mode IV Initialization vector. |
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VSA configured to measure standard Digital Video Broadcasting Terrestrial/Handheld signals: 2K 1/8, 4K 1/8, and 8K 1/8. |
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VSA configured to measure standard Digital Video Broadcasting - Satellite services to Handheld signal: 1k mode. |
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ISDB-T | VSA configured to measure a standard Integrated Services Digital Broadcasting - Terrestrial signal: Mode3, 1+12. |
The Custom OFDM demodulator must be selected before these standard presets are available.
OFDM Standard Preset Configuration: WLAN WLAN - Wireless Local Area Network: A system that includes the distribution system (DS), access points (APs), and portal entities. It is also the logical location of distribution and integration service functions of an extended service set (ESS). A WLAN system contains one or more APs and zero or more portals in addition to the DS. (802.11a) |
|
---|---|
Parameter |
|
Span |
25 MHz |
Format tab | |
64 |
|
Guard Interval |
0.25 (0.8 µs) |
Guard Lower Subcarriers |
6 subcarriers |
Guard Upper Subcarriers |
5 subcarriers |
OFDM System Sample Freq. |
20 MHz |
Pilot IQ Values | Standard values |
Preamble IQ values | Standard values |
QAM Identifiers The QAM Identifiers parameter is specified in the Format tab > QAM Idenifiers text box (Custom OFDM Demod Properties dialog box). | 0 1 2 3 4 5 |
QAM Quadrature Amplitude Modulation Levels | 0 1 2 4 6 8 |
Resource Map |
Standard values |
Resource Modulation | Standard values |
5 Symbols |
|
Signal is Bursted | Selected |
Transmitter Antennas | 1 |
Transmitter Window Beta | 0.005 |
QAM Identifier Power Boost Levels | 1 |
Unknown Pilot Power Boost Levels | 1 |
Power Boost Level Per User | 1 |
Time tab | |
Measurement Interval |
60 Symbols |
Measurement Offset |
0 |
Result Length |
60 Symbols |
Result Length Selection |
Automatic |
Search Length |
1 msec |
Auto Pulse Search Threshold |
Selected |
Pulse Search Enabled |
Selected |
Pulse Search Threshold |
-20 db |
Equalizer & Tracking tab | |
Equalizer Use Data | Cleared |
Equalizer Use DC Pilot | Selected |
Equalizer Use Pilots | Cleared |
Equalizer Use Preamble |
Selected |
Equalizer Averaging Mode | Equal Weight |
Track Amplitude | Cleared |
Track Phase |
Selected |
Track Timing | Cleared |
Advanced tab | |
EVM Error vector magnitude (EVM): A quality metric in digital communication systems. See the EVM metric in the Error Summary Table topic in each demodulator for more information on how EVM is calculated for that modulation format. Normalized by Reference | Selected |
Extended Frequency Lock Range | Selected |
Extended Frequency Lock Range Width | 10 Subcarriers |
Mirror Frequency Spectrum |
Cleared |
Symbol Time Adjustment |
-3.125% |
Synchronization Mode | TimeCorrelation |
Display Data Subcarriers | Selected |
Display EVM in Percent | Cleared |
Display Null Subcarriers | Cleared |
Display Pilot Subcarriers | Selected |
Display Preamble Subcarriers | Selected |
Display Subcarrier Color Based on User ID | Cleared |
Display Sync Correlation in Percent | Cleared |
Normalize IQ Traces |
Selected |
Parameter |
|||||
---|---|---|---|---|---|
Span |
1.5625 MHz |
3.125 MHz |
6.25 MHz |
12.5 MHz |
25 MHz |
Format tab | |||||
FFT Length |
32 |
64 |
128 |
256 |
512 |
Guard Interval |
0.25 (0.8 µs) |
0.25 (0.8 µs) |
0.25 (0.8 µs) |
0.25 (0.8 µs) |
0.25 (0.8 µs) |
Guard Lower Subcarriers |
0 subcarriers |
0 subcarriers |
0 subcarriers |
0 subcarriers |
0 subcarriers |
Guard Upper Subcarriers |
0 subcarriers |
0 subcarriers |
0 subcarriers |
0 subcarriers |
0 subcarriers |
OFDM System Sample Freq. |
1 MHz |
2 MHz |
4 MHz |
8 MHz |
16 MHz |
Pilot IQ Values | Standard values | Standard values | Standard values | Standard values | Standard values |
Preamble IQ values | Standard values | Standard values | Standard values | Standard values | Standard values |
QAM Identifiers | 0 1 2 3 4 5 | 0 1 2 3 4 5 | 0 1 2 3 4 5 | 0 1 2 3 4 5 | 0 1 2 3 4 5 |
QAM Levels | 0 1 2 4 6 8 | 0 1 2 4 6 8 | 0 1 2 4 6 8 | 0 1 2 4 6 8 | 0 1 2 4 6 8 |
Resource Map |
Standard values | Standard values | Standard values | Standard values | Standard values |
Resource Modulation | Standard values | Standard values | Standard values | Standard values | Standard values |
Resource Repeat Index |
14 Symbols |
6 Symbols |
6 Symbols |
6 Symbols |
6 Symbols |
Signal is Bursted | Selected | Selected | Selected | Selected | Selected |
Transmitter Antennas | 1 | 1 | 1 | 1 | 1 |
Transmitter Window Beta | 0.005 | 0.005 | 0.005 | 0.005 | 0.005 |
QAM Identifier Power Boost Levels | 1 | 1 | 1 | 1 | 1 |
Unknown Pilot Power Boost Level | 1 | 1 | 1 | 1 | 1 |
Power Boost Level Per User | 1 | 1, 1.037749, 1 | 1, 1.046974, 1 | 1, 1.2455, 1 | 1, 1.5254, 1 |
Time tab | |||||
Measurement Interval |
60 Symbols |
60 Symbols |
15 Symbols |
15 Symbols |
15 Symbols |
Measurement Offset |
0 |
0 |
0 |
0 |
0 |
Result Length |
77 Symbols |
90 Symbols |
15 Symbols |
15 Symbols |
15 Symbols |
Result Length Selection |
Automatic |
Automatic |
Automatic |
Automatic |
Automatic |
Search Length |
8 msec |
8 msec |
3.64 msec |
3.64 msec |
3.64 msec |
Auto Pulse Search Threshold |
Selected |
Selected |
Selected |
Selected |
Selected |
Pulse Search Enabled |
Selected |
Selected |
Selected |
Selected |
Selected |
Pulse Search Threshold |
-20 db |
-20 db |
-20 db |
-20 db |
-20 db |
Equalizer & Tracking tab | |||||
Equalizer Use Data | Cleared | Cleared | Cleared | Cleared | Cleared |
Equalizer Use DC Pilot | Selected |
Selected |
Selected |
Selected |
Selected |
Equalizer Use Pilots | Cleared | Cleared | Cleared | Cleared | Cleared |
Equalizer Use Preamble |
Selected |
Selected |
Selected |
Selected |
Selected |
Equalizer Averaging Mode | Equal Weight | Equal Weight | Equal Weight | Equal Weight | Equal Weight |
Track Amplitude | Selected | Selected | Selected | Selected | Selected |
Track Phase |
Selected |
Selected |
Selected |
Selected |
Selected |
Track Timing | Selected | Selected | Selected | Selected | Selected |
Advanced tab | |||||
EVM Normalized by Reference | Selected | Selected | Selected | Selected | Selected |
Extended Frequency Lock Range | Selected | Selected | Selected | Selected | Selected |
Extended Frequency Lock Range Width | 10 Subcarriers | 10 Subcarriers | 10 Subcarriers | 10 Subcarriers | 10 Subcarriers |
Mirror Frequency Spectrum |
Cleared |
Cleared |
Cleared |
Cleared |
Cleared |
Symbol Time Adjustment |
-3.125% |
-3.125% |
-3.125% |
-3.125% |
-3.125% |
Synchronization Mode | CyclicPrefix | CyclicPrefix | CyclicPrefix | CyclicPrefix | CyclicPrefix |
Synchronization Region Selection | Automatic | Automatic | Automatic | Automatic | Automatic |
Display Data Subcarriers | Selected | Selected | Selected | Selected | Selected |
Display EVM in Percent | Cleared | Cleared | Cleared | Cleared | Cleared |
Display Null Subcarriers | Cleared | Cleared | Cleared | Cleared | Cleared |
Display Pilot Subcarriers | Selected | Selected | Selected | Selected | Selected |
Display Preamble Subcarriers | Selected | Selected | Selected | Selected | Selected |
Display Subcarrier Color Based on User ID | Cleared | Cleared | Cleared | Cleared | Cleared |
Display Sync Correlation in Percent | Cleared | Cleared | Cleared | Cleared | Cleared |
Normalize IQ Traces |
Selected |
Selected |
Selected |
Selected |
Selected |
Synchronization Reference Interval |
10 |
10 |
10 |
10 |
10 |
Synchronization Reference Offset |
0 |
0 |
0 |
0 |
0 |
Synchronization Search Interval |
1 |
1 |
1 |
1 |
1 |
Synchronization Search Offset |
0 |
0 |
0 |
0 |
0 |
Parameter |
Mode I |
Mode II | Mode III | Mode IV |
---|---|---|---|---|
Span |
3.2 MHz |
3.2 MHz | 3.2 MHz | 3.2 MHz |
Format tab | ||||
FFT Length |
2048 |
512 | 256 | 1024 |
Guard Interval |
0.24609375 |
0.24609375 | 0.24609375 | 0.24609375 |
Guard Lower Subcarriers |
256 subcarriers |
64 subcarriers | 32 subcarriers | 128 subcarriers |
Guard Upper Subcarriers |
255 subcarriers |
63 subcarriers | 31 subcarriers | 127 subcarriers |
OFDM System Sample Freq. |
2.048 MHz |
2.048 MHz | 2.048 MHz | 2.048 MHz |
Pilot IQ Values | --- | --- | --- | --- |
Preamble IQ values | Standard values | Standard values | Standard values | Standard values |
QAM Identifiers | 0 1 2 3 4 5 | 0 1 2 3 4 5 | 0 1 2 3 4 5 | 0 1 2 3 4 5 |
QAM Levels | 0 1 2 4 6 8 | 0 1 2 4 6 8 | 0 1 2 4 6 8 | 0 1 2 4 6 8 |
Resource Map |
Standard values | Standard values | Standard values | Standard values |
Resource Modulation | Standard values | Standard values | Standard values | Standard values |
Resource Repeat Index |
1 Symbol |
1 Symbol |
1 Symbol |
1 Symbol |
Signal is Bursted | Selected | Selected | Selected | Selected |
Transmitter Antennas | 1 | 1 | 1 | 1 |
Transmitter Window Beta | 0.005 | 0.005 | 0.005 | 0.005 |
QAM Identifier Power Boost Levels | 1 | 1 | 1 | 1 |
Unknown Pilot Power Boost Levels | 1 | 1 | 1 | 1 |
Power Boost Level Per User | 1 | 1 | 1 | 1 |
Time tab | ||||
Measurement Interval |
60 Symbols |
60 Symbols |
60 Symbols |
60 Symbols |
Measurement Offset |
0 |
0 |
0 |
0 |
Result Length |
60 Symbols |
60 Symbols |
60 Symbols |
60 Symbols |
Result Length Selection |
Automatic |
Automatic |
Automatic |
Automatic |
Search Length |
200 msec |
200 msec |
200 msec |
200 msec |
Auto Pulse Search Threshold |
Selected |
Selected | Selected | Selected |
Pulse Search Enabled |
Selected |
Selected |
Selected |
Selected |
Pulse Search Threshold |
-20 db |
-20 db |
-20 db |
-20 db |
Equalizer & Tracking tab | ||||
Equalizer Use Data | Cleared | Cleared | Cleared | Cleared |
Equalizer Use DC Pilot | Selected | Selected | Selected | Selected |
Equalizer Use Pilots | Cleared | Cleared | Cleared | Cleared |
Equalizer Use Preamble |
Selected |
Selected |
Selected |
Selected |
Equalizer Averaging Mode | Equal Weight | Equal Weight | Equal Weight | Equal Weight |
Track Amplitude | Cleared | Cleared | Cleared | Cleared |
Track Phase |
Selected |
Selected |
Selected |
Selected |
Track Timing | Cleared | Cleared | Cleared | Cleared |
Advanced tab | ||||
EVM Normalized by Reference | Selected | Selected | Selected | Selected |
Extended Frequency Lock Range | Selected | Selected | Selected | Selected |
Extended Frequency Lock Range Width | 10 Subcarriers | 10 Subcarriers | 10 Subcarriers | 10 Subcarriers |
Mirror Frequency Spectrum |
Cleared |
Cleared |
Cleared |
Cleared |
Symbol Time Adjustment |
-3.125% |
-3.125% |
-3.125% |
-3.125% |
Synchronization Mode | CyclicPrefix | CyclicPrefix | CyclicPrefix | CyclicPrefix |
Display Data Subcarriers | Selected | Selected | Selected | Selected |
Display EVM in Percent | Cleared | Cleared | Cleared | Cleared |
Display Null Subcarriers | Cleared | Cleared | Cleared | Cleared |
Display Pilot Subcarriers | Selected | Selected | Selected | Selected |
Display Preamble Subcarriers | Selected | Selected | Selected | Selected |
Display Subcarrier Color Based on User ID | Cleared | Cleared | Cleared | Cleared |
Display Sync Correlation in Percent | Cleared | Cleared | Cleared | Cleared |
Normalize IQ Traces |
Selected |
Selected |
Selected |
Selected |
Parameter |
2k mode |
4k mode | 8k mode |
---|---|---|---|
Span |
14.286 MHz |
14.286 MHz | 14.286 MHz |
Format tab | |||
FFT Length |
2048 |
4096 | 8192 |
Guard Interval |
0.125 |
0.125 | 0.125 |
Guard Lower Subcarriers |
172 subcarriers |
344 subcarriers | 688 subcarriers |
Guard Upper Subcarriers |
171 subcarriers |
343 subcarriers | 687 subcarriers |
OFDM System Sample Freq. |
9.142857 MHz |
9.142857 MHz | 9.142857 MHz |
Pilot IQ Values | Standard values | Standard values | Standard values |
Preamble IQ values | --- | --- | --- |
QAM Identifiers | 0 1 2 3 4 5 | 0 1 2 3 4 5 | 0 1 2 3 4 5 |
QAM Levels | 0 1 6 4 6 8 | 0 1 6 4 6 8 | 0 1 6 4 6 8 |
Resource Map |
Standard values | Standard values | Standard values |
Resource Modulation | Standard values | Standard values | Standard values |
Resource Repeat Index |
0 Symbols |
0 Symbols |
0 Symbols |
Signal is Bursted | Cleared | Cleared | Cleared |
Transmitter Antennas | 1 | 1 | 1 |
Transmitter Window Beta | 0.005 | 0.005 | 0.005 |
QAM Identifier Power Boost Levels | 1 | 1 | 1 |
Unknown Pilot Power Boost Level | 1 | 1 | 1 |
Power Boost Level Per User | 1 | 1 | 1 |
Time tab | |||
Measurement Interval |
4 Symbols |
4 Symbols |
4 Symbols |
Measurement Offset |
0 |
0 |
0 |
Result Length |
4 Symbols |
4 Symbols |
4 Symbols |
Result Length Selection |
Automatic |
Automatic |
Automatic |
Search Length |
58.716 msec |
58.464 msec | 58.464 msec |
Auto Pulse Search Threshold |
Selected |
Selected |
Selected |
Pulse Search Enabled |
Selected |
Selected |
Selected |
Pulse Search Threshold |
-20 db |
-20 db |
-20 db |
Equalizer & Tracking tab | |||
Equalizer Use Data | Cleared | Cleared | Cleared |
Equalizer Use DC Pilot | Selected | Selected | Selected |
Equalizer Use Pilots | Cleared | Cleared | Cleared |
Equalizer Use Preamble |
Selected |
Selected |
Selected |
Equalizer Averaging Mode | Equal Weight | Equal Weight | Equal Weight |
Track Amplitude | Cleared | Cleared | Cleared |
Track Phase |
Selected |
Selected |
Selected |
Track Timing | Cleared | Cleared | Cleared |
Advanced tab | |||
EVM Normalized by Reference | Selected | Selected | Selected |
Extended Frequency Lock Range | Selected | Selected | Selected |
Extended Frequency Lock Range Width | 10 Subcarriers | 10 Subcarriers | 10 Subcarriers |
Mirror Frequency Spectrum |
Cleared |
Cleared |
Cleared |
Symbol Time Adjustment |
-3.125% |
-3.125% |
-3.125% |
Synchronization Mode | CyclicPrefix | CyclicPrefix | CyclicPrefix |
Display Data Subcarriers | Selected | Selected | Selected |
Display EVM in Percent | Cleared | Cleared | Cleared |
Display Null Subcarriers | Cleared | Cleared | Cleared |
Display Pilot Subcarriers | Selected | Selected | Selected |
Display Preamble Subcarriers | Selected | Selected | Selected |
Display Subcarrier Color Based on User ID | Cleared | Cleared | Cleared |
Display Sync Correlation in Percent | Cleared | Cleared | Cleared |
Normalize IQ Traces |
Selected |
Selected |
Selected |
Parameter |
1k mode |
---|---|
Span |
2.857 MHz |
Format tab | |
FFT Length |
1024 |
Guard Interval |
0.03125 |
Guard Lower Subcarriers |
86 subcarriers |
Guard Upper Subcarriers |
85 subcarriers |
OFDM System Sample Freq. |
1.8285714 MHz |
Pilot IQ Values | Standard values |
Preamble IQ values | --- |
QAM Identifiers | 0 1 2 3 4 5 |
QAM Levels | 0 1 2 4 6 8 |
Resource Map |
Standard values |
Resource Modulation | Standard values |
Resource Repeat Index |
1 sym |
Signal is Bursted | Selected |
Transmitter Antennas | 1 |
Transmitter Window Beta | 0.005 |
QAM Identifier Power Boost Levels | 1 |
Unknown Pilot Power Boost Level | 1 |
Power Boost Level Per User | 1 |
Time tab | |
Measurement Interval |
60 Symbols |
Measurement Offset |
0 |
Result Length |
60 Symbols |
Result Length Selection |
Automatic |
Search Length |
200 msec |
Auto Pulse Search Threshold |
Selected |
Pulse Search Enabled |
Selected |
Pulse Search Threshold |
-20 db |
Equalizer & Tracking tab | |
Equalizer Use Data | Cleared |
Equalizer Use DC Pilot | Selected |
Equalizer Use Pilots | Cleared |
Equalizer Use Preamble |
Selected |
Equalizer Averaging Mode | Equal Weight |
Track Amplitude | Cleared |
Track Phase |
Selected |
Track Timing | Cleared |
Advanced tab | |
EVM Normalized by Reference | Selected |
Extended Frequency Lock Range | Selected |
Extended Frequency Lock Range Width | 10 Subcarriers |
Mirror Frequency Spectrum |
Cleared |
Symbol Time Adjustment |
-3.125% |
Synchronization Mode | CyclicPrefix |
Display Data Subcarriers | Selected |
Display EVM in Percent | Cleared |
Display Null Subcarriers | Cleared |
Display Pilot Subcarriers | Selected |
Display Preamble Subcarriers | Selected |
Display Subcarrier Color Based on User ID | Cleared |
Display Sync Correlation in Percent | Cleared |
Normalize IQ Traces |
Selected |
Parameter |
Mode3, 1+12 |
---|---|
Span |
12.698 MHz |
Format tab | |
FFT Length |
8192 |
Guard Interval |
0.125 |
Guard Lower Subcarriers |
1288 subcarriers |
Guard Upper Subcarriers |
1287 subcarriers |
OFDM System Sample Freq. |
8.127 MHz |
Pilot IQ Values | Standard values |
Preamble IQ values | --- |
QAM Identifiers | 0 1 2 3 4 5 |
QAM Levels | 0 1 2 4 6 8 |
Resource Map |
Standard values |
Resource Modulation | Standard values |
Resource Repeat Index |
0 sym |
Signal is Bursted | Cleared |
Transmitter Antennas | 1 |
Transmitter Window Beta | 0.005 |
QAM Identifier Power Boost Levels | 1, 1.3333 |
Unknown Pilot Power Boost Level | 1 |
Power Boost Level Per User | 1 |
Time tab | |
Measurement Interval |
10 Symbols |
Measurement Offset |
0 |
Result Length |
10 Symbols |
Result Length Selection |
Automatic |
Search Length |
25 msec |
Auto Pulse Search Threshold |
Selected |
Pulse Search Enabled |
Cleared |
Pulse Search Threshold |
-20 db |
Equalizer & Tracking tab | |
Equalizer Use Data | Selected |
Equalizer Use DC Pilot | Selected |
Equalizer Use Pilots | Selected |
Equalizer Use Preamble |
Cleared |
Equalizer Averaging Mode | Equal Weight |
Track Amplitude | Cleared |
Track Phase |
Selected |
Track Timing | Selected |
Advanced tab | |
EVM Normalized by Reference | Selected |
Extended Frequency Lock Range | Selected |
Extended Frequency Lock Range Width | 10 Subcarriers |
Mirror Frequency Spectrum |
Cleared |
Symbol Time Adjustment |
-3.125% |
Synchronization Mode | CyclicPrefix |
Display Data Subcarriers | Selected |
Display EVM in Percent | Cleared |
Display Null Subcarriers | Cleared |
Display Pilot Subcarriers | Selected |
Display Preamble Subcarriers | Selected |
Display Subcarrier Color Based on User ID | Cleared |
Display Sync Correlation in Percent | Cleared |
Normalize IQ Traces |
Selected |
See Also