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Custom IQ - Channel Sounding

Quick Setups

Use this Closeddrop-down menu to select a modulation type from several supported formats. A single data segment using that modulation type appears in the segment list below. Click the cell in the Constellation column to open the Constellation Setting window, providing a graphical display and editing features (video). Quick setups enable you to configure complex signals for signal generation, equivalent to 89600B VSA setups in signal analysis.

DVB-S2 and DVB-S2X quick setups also add a PLHEADER segment before the data segment, as defined in the standard.

Quick Setups IQ Settings

Standard

Modulation

Symbol Rate

Filter

DVB-S2

QPSK

 

1.0 Msps

RNYQ (0.5)

8PSK

 

16APSK

4+12APSK 2/3, 4+12APSK 3/4, 4+12APSK 4/5, 4+12APSK 5/6, 4+12APSK 8/9, 4+12APSK 9/10

32APSK

4+12+16APSK 3/4, 4+12+16APSK 4/5, 4+12+16APSK 5/6, 4+12+16APSK 8/9, 4+12+16APSK 9/10

DVB-S2X

QPSK

 

1.0 Msps

RNYQ (0.5)

8PSK

 

8APSK

2+4+2APSK 100/180, 2+4+2APSK 104/180

16APSK

4+12APSK Normal 26/45; 4+12APSK Normal 3/5; 4+12APSK Normal 28/45; 4+12APSK Normal 23/36; 4+12APSK Normal 25/36; 4+12APSK Normal 13/18; 4+12APSK Normal 140/180; 4+12APSK Normal 154/180; 4+12APSK Short 7/15; 4+12APSK Short 8/15; 4+12APSK Short 26/45; 4+12APSK Short 3/5; 4+12APSK Short 32/45; 8+8APSK Normal 90/180, 96/180, 100/180; 8+8APSK Normal 18/30; 8+8APSK Normal 20/30

32APSK

4+12+16APSK Normal 2/3, 4+12+16APSK Short 2/3, 4+12+16APSK Short 32/45, 4+8+4+16APSK 128/180, 4+8+4+16APSK 132/180, 4+8+4+16APSK 140/180

64APSK

16+16+16+16APSK 128/180, 8+16+20+20APSK 7/9, 8+16+20+20APSK 4/5, 8+16+20+20APSK 5/6, 4+12+20+28APSK 132/180,

128APSK

128APSK 135/180, 128APSK 140/180

256APSK

256APSK 116/180, 256APSK 124/180, 256APSK 128/180, 256APSK 135/180, 256APSK 20/30, 256APSK 22/30

APCO25

C4FM

4FSK (0.6 kHz, 1.8 kHz, -0.6 kHz, -1.8 kHz)

4.8 ksps

NYQ (0.2) + 1/Sinc

CQPSK*

Pi/4 DQPSK

4.8 ksps

NYQ

HCPM

4FSK (1 kHz, 3 kHz, -1 kHz, -3 kHz)

6 ksps

APCO25 HCPM

HDQPSK

Pi/4 DQPSK

6 ksps

APCO25 HDQPSK

TETRA

Pi/4 DQPSK

18 ksps

RNYQ (0.35)

NXDN

4800 bps

4FSK (0.35 kHz, 1.05 kHz, -0.35 kHz, -1.05 kHz)

2.4 ksps

RNYQ (0.2) + Sinc

9600 bps

4FSK (0.8 kHz, 2.4 kHz, -0.8 kHz, 2.4 kHz)

4.8 ksps

RNYQ (0.2) + Sinc

dPMR

4FSK (0.35 kHz, 1.05 kHz, -0.35 kHz, -1.05 kHz)

2.4 ksps

RNYQ (0.2)

DECT

2FSK (-288 kHz, 288 kHz)

1.152 Msps

Gaussian (0.5)

DMR

4FSK (0.648 kHz, 1.944 kHz, -0.648 kHz, -1.944 kHz)

4.8 ksps

RNYQ (0.2)
ARIB

T98/T61*

Pi/4 DQPSK

9.6 ksps

RNYQ (0.2)

T102

4FSK (0.33 kHz, 0.99 kHz, -0.33 kHz, -0.99 kHz)

4.8 ksps

ARIB T102 RNYQ (0.2) + Gaussian (0.769)

Zigbee

BPSK

BPSK

600 ksps

NYQ (1)

OQPSK

OQPSK

1 Msps

Half Sine

WiSUN (802.15.4g)

2FSK 50/1

2FSK (-25 kHz, 25 kHz)

50 ksps

Gaussian (0.5)

2FSK 100/0.5

2FSK (-25 kHz, 25 kHz)

100 ksps

Gaussian (0.5)

ITU-T G.9959

R2

2FSK (-20 kHz, 20 kHz)

40 ksps

Rectangle

R3

2FSK (-29 kHz, 29 kHz)

100 ksps

Gaussian (0.6)

802.15.3d

CES: pi/2 BPSK

Frame Header: pi/2 BPSK

Payload: 64QAM

25.92 Gsps

RNYQ (0.25)

* For APCO25 CQPSK and ARIB T98/T61, the ALC is set to off to achieve better EVM. For all other cases, the ALC is on.

Payload, Idle Interval, Ramp Symbols, and Number of Symbols will be set to default values.

1. Custom IQ Selection

Custom IQ Type

Choices: ASK & PSK & QAM | FSK | SOQPSK | ARTM Multi-h CPM | Analog Modulation | Radar | Channel Sounding

Default: ASK & PSK & QAM

Select the type of Custom IQ.

2. Channel Sounding Settings

Sequence Length

Choices: 32 Symbols | 64 Symbols | 128 Symbols | 256 Symbols | 512 Symbols | 1024 Symbols | 2048 Symbols | 4096 Symbols | 8192 Symbols | 16384 Symbols | 32768 Symbols | 65536 Symbols

Default: 128 Symbols

Coupling: Total Sample Points are automatically determined based on the Sequence Length

Select the number of symbols in the transmitted sequence.

The sequence length selections of 8192, 16384, 32768, and 65536 symbols require license version 2024.0801 or later.

Number of Repeats

Range: 1 ~ 100

Default: 2

Set the number of repetitions of the sequence when the Idle Interval is non-zero. The total number of repetitions transmitted contiguously will be Number of Repeats + 1, to allow for channel sounder filter settling and sync boundary location.

When the Idle Interval is not zero, the active period in time is (Repeats + 1)* (Sequency Length * 8 / Symbol Rate).

Symbol Rate

Range: 1 ksps to 25 Gsps

Default: 200 Msps

Coupling: Sample Clock = Symbol Rate * Oversampling Ratio

Set the symbol rate of Channel Sounding signal.

Filter

Choices: None | Gaussian | Root Raised Cosine | Root Nyquist | Nyquist | Rectangle | Flat | User Defined

Default: Root Raised Cosine

Select the filter type to be applied to the waveform.

The filter type Flat means that a Tukey window is applied to the frequency domain, which has a flat frequency domain response and uses a fixed order of 48 internally. This filter selection requires license version 2024.0801 or later.

BT

Range: 0.1 to 1.0

Default: 0.5

Sets the BT product of the Gaussian filter.

Length(symbol)

Range: 1 to 2048

Default: 32

Sets the length of the filter in symbols.

Alpha

Range: 0.01 to 1.0

Default: 0.5

Sets the alpha factor of the Root Nyquist or Nyquist filter.

Filter Coefficient

Opens a ClosedFilter Editor window where you can import, export, and edit filter coefficients. A convenient plot of the filter's impulse response is displayed and updates as coefficients are changed. Imported and exported coefficient files are in text (*.txt) or comma-separated values (*.csv) format.

Multi-path Channel

Choices: OFF | User Defined

Default: OFF

Click the button to open the ClosedMulti-path Channel editor where you can select User Defined to activate the multi-path channel. Up to 20 multi-paths are supported, and each multi-path has three parameters: power level, delay, and angle. You can switch the unit of power level between dB and Ratio.

The parameters configured with the Multi-path Channel editor can be saved or recalled, using the Save or Open buttons.

The file must be saved or recalled when the Unit is Ratio mode.

Idle Interval

Range: 0 to 200 ms

Default: 0 us

Set the idle interval in-between Channel Sounding frames in seconds. When idle interval is set to zero, a continuous waveform will be generated.