Radio Access Network Interference Testing Across the CPRI/OBSAI Link Now Possible Using Investigator from Absolute Analysis

Absolute Analysis solves problem of debugging Interference in antennas on 3G/4G Networks

Absolute Analysis today announced it has completed features that will make it possible for telecom service providers to do interference analysis of wireless signals in radio access networks (RAN) by extracting the RF data directly from the CPRI or OBSAI link.

One of the most difficult and costly task for telecom operators is to debug interference problems that can enter a cell tower antenna.  Currently, because of the separation of the remote radio head (RRH) and the baseband unit (BBU) in modern 3G and 4G radio access networks (RAN), the only place the wireless signal is available is at the top of the tower.  In order to get to this signal, an expensive “truck roll” is required by field technicians, whereby they must carry heavy equipment to the top of the tower to measure the radio frequency (RF) signal. 

In addition, even if the signal can be measured at the top of the tower, it is almost impossible to measure the exact radio horizon as the cell tower antenna.  Inexact physical placement of the measurement equipment, as well as multiple noise sources and reflections can cause inaccurate readings.  These issues make the current solution both inaccurate and costly. 

This problem can be solved by using the Investigator serial test platform from Absolute Analysis.   Investigator can tap into the communication link that exists between the RRH and the BBU at the bottom of the tower.  This communications link uses the CPRI or OBSAI protocol to carry the digitized RF signal.  The RF data exists in the form of IQ, and this IQ data can be extracted and fed into a signal analysis software tools like Mathwork’s Matlab® or Tektronix’ SignalVu® in order to analyze the power spectrum and noise signatures.

“This solution is a game changer for operators who are struggling with debugging noise problems on their cell towers.” says Dennis Murphy, CEO of Absolute Analysis.  “The solution will eliminate expensive truck rolls, produce more accurate noise analysis, and solve noise problems faster than current solutions.”

The Investigator platform is available today, with current leads times of 5 to 8 weeks.  For more information, please call our sales department at (805)376-6048 or visit their mobile test solutions web page at

Matlab is a registered trademark of Mathworks, Inc.

SignalVu is a registered trademark of Tektronix, Inc.

Contact Information

Absolute Analysis, Inc.

2393 Teller Road
Suite 109
Newbury Park, CA, 91320

tele: 805.376.6048
fax: 805.376.6041

Share and Enjoy:
  • Digg
  • Sphinn
  • Facebook
  • Mixx
  • Google
  • TwitThis
Extension Media websites place cookies on your device to give you the best user experience. By using our websites, you agree to placement of these cookies and to our Privacy Policy. Please click here to accept.