Application Examples
R&S
®
EX-IQ-BOX
49
User Manual 1409.5570.32 ─ 05
The test setup covers the downlink and the uplink. It provides testing both directions either
simultaneously, i.e. full duplex, or uplink and downlink seperately.
The downlink signal flow
The R&S baseband signal generator feeds a baseband signal (e.g. an LTE downlink) in
the R&S specific I/Q format to the R&S
EX-IQ-BOX. The R&S
EX-IQ-BOX converts the
R&S I/Q format into the CPRI protocol. The CPRI link transmits the I/Q baseband signal
and control & management information from the R&S
EX-IQ-BOX to the DUT, in this case
the CPRI RE Device.
The CPRI RE device extracts the baseband signal from the CPRI link and executes an
I/Q modulation to a certain carrier frequency RF. The resulting RF signal is sent to the
R&S spectrum-analyzer, to perform various measurements, e.g.
ACP
(
A
djacent
C
hannel
P
ower) or
EVM
(
E
rror
V
ector
M
agnitude) evaluation.
The uplink signal flow
The R&S vector signal generator feeds an RF signal (e.g. an LTE uplink) via the antenna
input into the CPRI RE device. The DUT converts the signal from RF to baseband and
transmits the baseband signal by using the CPRI link.
The R&S
EX-IQ-BOX extracts the I/Q baseband signal from the CPRI protocol and sends
the signal in the R&S specific I/Q format to the R&S signal analyzer for demodulation.
All settings regarding the baseband signal (e.g. LTE) are directly controlled by the R&S
signal generator and analyzer, respectively.
CPRI settings like I/Q mapping or link settings are controlled by the configurator software
R&S
DigIConf .
In addition to the I/Q data,
C&M
(
C
ontrol and
M
anagement) information is embedded in
the CPRI protocol. These parameters are also set with the aid of R&S
DigIConf.
An Ethernet connector provides fast C&M, and the R&S
DigIConf inline text console can
be used for slow C&M.
5.2.2 Typical CPRI REC Test Setup
Example of a typical CPRI
REC
(
R
adio
E
quipment
C
ontrol = baseband unit) test scenario,
where the R&S
EX-IQ-BOX acts as a RF module RE (Remote Equipment).
The test setup requires the CPRI breakout board, option R&S EXBOX-B85, the CPRI
REC Test, option R&S EXBOX-K11 and the configuration software R&S
DigIConf. For
details on available options, see
chapter 3.2.2.1, "Standardized Protocols"
CPRI Test Setup
Summary of Contents for EX-IQ-BOX
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