334
Agilent X-Series Signal Generators SCPI Command Reference
Arb Commands
Two Tone Subsystem–N5172B/82B ([:SOURce]:RADio:TTONe:ARB)
To configure the AWGN, refer to the following sections located in the Two Tone subsystem:
•
To set the bandwidth over which the noise power is integrated for calculating the carrier to noise
ratio, refer to
“:NOISe:CBWidth” on page 334
.
•
To set the carrier to noise ratio as the active function, refer to
“:NOISe:CN” on page 335
.
•
To enable the AWGN, refer to
“:NOISe[:STATe]” on page 338
.
*RST
+1.00000
Key Entry
Noise Bandwidth
:NOISe:CBRate
Supported
N5172B/82B with Option 403
[:SOURce]:RADio:TTONe:ARB:NOISe:CBRate <1bps - 999Mbps>
[:SOURce]:RADio:TTONe:ARB:NOISe:CBRate?
This command sets a value of the carrier bit rate (gross bit rate) for purposes of calculating the
E
b
/N
0
(energy per bit over noise power density at the receiver). When the carrier to noise ratio
format is set to E
b
/N
0
(refer to the
:NOISe:CNFormat
command), the adjustment of the carrier bit rate
will have an immediate impact on the carrier to noise ratio as specified by E
b
/N
0
. The carrier bit rate
is derived from the symbol rate and bits per symbol of the modulation. The carrier bit rate is a saved
instrument state that is recorded in the waveform header.
The query returns the current carrier bit rate setting.
Example
:RAD:TTON:ARB:NOIS:CBR 5
The preceding example sets the carrier bit rate to 5 bps.
Default
1.000 bps
Range
1 bps to 999 Mbps
Key Entry
Carrier Bit Rate
:NOISe:CBWidth
Supported
N5172B/82B with Option 403
[:SOURce]:RADio:TTONe:ARB:NOISe:CBWidth <val><unit>
[:SOURce]:RADio:TTONe:ARB:NOISe:CBWidth?
This command selects the carrier bandwidth over which the AWGN (additive white gaussian noise) is
applied. The noise power will be integrated over the selected bandwidth for the purposes of
calculating C/N (carrier to noise ratio). The carrier bandwidth is limited to the ARB sample rate but
cannot exceed 125 MHz. For more information refer to
“:NOISe[:STATe]” on page 338
.
Range
Option 653
1 sa to 75 Msa
Option 655
1 sa to 150 Msa
Option 656
1 sa to 100 Msa
Option 657
1 sa to 200 Msa