Keysight x-series User Manual

6 Input/Output
6.1 RF Source
Real-Time 5G NR Compensation
Phase compensation is a new concept introduced into 5G NR baseband signal
generation in TS38.211 as below, to address a typical 5G scenario that Tx and Rx
frequencies may not be the same. In that case, without properly compensating the
phase, receiver would not be able to correctly demodulate the received signal.
Modulation and up-conversion to the carrier frequency ƒ
0
of the complex-valued
OFDM baseband signal for antenna port p, subcarrier spacing configuration µ, and
OFDM symbol l in a subframe assumed to start at t = 0 is given by the following
equation for all channels and signals except PRACH:
From the 3GPP specification equation above, it can be observed that phase
compensation is performed for a specific transmission frequency f
0
. So that means,
even if a same signal configuration needs to be transmitted at multiple frequencies,
we’ll have to generate a different waveform for each frequency point. As a result, the
number of test waveforms will increase significantly along with the frequency
number. This would be a big challenge for test engineers, considering the
complexity of 5G NR signal configurations - they have to maintain a large waveform
library and identify each waveform carefully with its “frequency tag”.
Real-Time 5G NR Phase Compensation allows you to play the same 5G NR
waveform while performing phase compensation along with transmission frequency
change automatically. This control allows you to turn on or off the real-time phase
compensation for 5G NR waveform.
Remote Command
:SOURce:RADio:ARB:NR5G:PHASe[:STATe] ON | OFF | 1 | 0
:SOURce:RADio:ARB:NR5G:PHASe[:STATe]?
Example
:SOUR:RAD:ARB:NR5G:PHAS ON
:SOUR:RAD:ARB:NR5G:PHAS?
Dependencies Only appears when Option RPC is present
If the waveform is not for 5G NR, there may be error message and the output signal may be incorrect
To ensure that you do not compensate for phase twice, once at waveform generation and again during
playback, turn off this control if you had turned on phase compensation while generating the
waveform
Preset
OFF
Range
ON|OFF
Spectrum Analyzer Mode User's &Programmer's Reference 2303

Keysight x-series Specifications

General

Analysis Bandwidth	Up to 1 GHz (depending on model)
Real-Time Bandwidth	Up to 1 GHz (depending on model)
Form Factor	Benchtop
Connectivity	LAN, USB, GPIB
Resolution Bandwidth	1 Hz to 10 MHz (depending on model)