LTE PRACH Measurement
R&S
®
CMW-KM5xx/-KS5xx
740
User Manual 1173.9628.02 ─ 16
4 LTE PRACH Measurement
The "LTE PRACH" measurement provides quick and flexible tests on LTE FDD and
TDD random access preambles. The tests cover the following UE transmitter proper-
ties:
●
Modulation accuracy for each PRACH subcarrier (EVM, Magnitude Error, Phase
Error)
●
Transmit OFF power, transmit ON power and power ramping between them
(Power Dynamics)
●
I/Q Constellation diagram
The PRACH measurement requires option R&S CMW-KM500 for FDD signals and
R&S CMW-KM550 for TDD signals.
4.1 What's New in this Revision
This revision describes version 3.2.10 and later of the "LTE PRACH Measurement"
firmware application. Compared to version 3.0.30 it provides the following new fea-
tures:
●
Configurable frequency offset, see
Software Version
To check your R&S
CMW software version, open the "Setup" dialog and click "HW/SW
Equipment". The initial software version for each remote control command is quoted in
the reference description.
4.2 General Description
The LTE PRACH measurement captures an uplink (UL) LTE PRACH signal and pro-
vides TX measurement results for the random access preambles. Both FDD signals
(option R&S CMW-KM500) and TDD signals (option R&S CMW-KM550) can be mea-
sured.
The following sections describe how to perform and configure the measurement.
How to Measure an Uplink PRACH Signal
........................................................... 741
Defining the Scope of the Measurement
...............................................................742
Parallel Signaling and Measurement
.................................................................... 743
Calculation of Modulation Results
.........................................................................744
LTE PRACH UL Signal Properties
........................................................................745
Limit Settings and Conformance Requirements
....................................................747
........................................................................................... 749
What's New in this Revision
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