CPRI RF Analyzerand BBU Emulator Measurement Guide : CPRI Analyzer
 
CPRI Analyzer
 
Introduction
Setup Requirements and Checklist
Typical CPRI Connection
CPRI Parameters
Line Rate
AxC Group
CPRI Bandwidth
IQ Bit Width
Reserve Bits
CPRI Aggregation
IQ Bit Mapping
CPRI Configuration
Radio Presets
CPRI Parameter Automatic Detection
CPRI Measurement Display
CPRI Spectrum
Spectrogram
CPRI Configuration Example
Base Band Unit Emulation (Option 760)
BBU Script Download
LTE Waveform Download
BBU Test
CPRI Analyzer Menu Map
Measurements Menu Map
Sweep Menu
Trace Menus
Limit Menus
Freq Menu
Span Menu
Amplitude Menu
Units of External Gain or Loss
Bandwidth Menu
Measure Menu
BBU Emulation Menu (Option 760 Only)
Script Manager Menu
BBU Test Menu
BBU RF Test Menu
LTE Waveforms Menu
RL/VSWR Menu
CPRI Config Menu
SFP Port Config Menu
Radio Presets Menu
Custom Settings Menu
Auto Detect Menu
Display Config Menu
AxC Trace Config Menu
CPRI Spectrum Menu
Spectrogram Menu
Display Setup Menu
CPRI SFP Data Menu
Marker Menu
Marker 2/2 Menu
Sweep Menu
Trace Menu
Trace A Ops Menu
Trace B Ops Menu
Trace C Ops Menu
Limit Menu
Limit Move Menu
Save Menu
Save Location Menu
Recall Menu
Introduction
The Common Public Radio Interface (CPRI) is a protocol standard for wireless communications between remote radio heads, also referred to as Radio Equipment (RE), and the Radio Equipment Controller (REC). The main differences with traditional RF signals are summarized in Table: CPRI Signal Characteristics (Compared to RF).
CPRI Signal Characteristics (Compared to RF)
RF
CPRI
Analog
Digital
Absolute measurements
Relative measurements
dBm
dB
Specific center frequency
Base Band
Absolute power levels
Relative power levels
Full Span capable
Max Span = Carrier BW + 50%
Anritsu’s CPRI Analyzer (Option 752) allows users to make RF-based measurements over a fiber optic CPRI link to look for interference problems affecting a Remote Radio Head (RRH). This is accomplished by tapping into the fiber link between the RRH and BBU (Base Band Unit), using an optical splitter to connect the RRH and BBU to the Anritsu test instrument. The instrument will decode the CPRI protocol IQ data and convert it to RF data.
Note 
Option 752 requires Option 759, RF over Fiber Hardware. Depending on your Anritsu test instrument model, Option 759 may have a single or dual SFP ports. Refer to your instrument Technical Data Sheet for specifications. The combination of Option 759 and Option 752 is functionally identical to the obsolete Option 751.
Screen displays vary with the installed option and instrument model being used. The screen captures illustrated in this document are examples and may differ from your instrument display.
Some functions and parameter settings described in this manual are available only in firmware version 2.6 and later. Refer to your instrument User Guide for instructions on upgrading firmware.
Two types of CPRI measurements are available:
Spectrum mode is typically used to test the CPRI link in real time.
Spectrogram mode lets users monitor for intermittent interference over a specifiable recording time.
These CPRI Analyzer test and measurement functions can be performed from ground level, eliminating the risk and costs of climbing towers. Figure: Connection Configuration for CPRI RF Testing with Anritsu Test Instrument illustrates a typical connection configuration for CPRI RF testing with an Anritsu test instrument.
Connection Configuration for CPRI RF Testing with Anritsu Test Instrument