By Topic

Mitigation of Reverse Intermodulation Products at Colocated Base Stations

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Ahmed, S. ; School of Engineering and Science, Victoria University, Melbourne, Australia ; Faulkner, M.

In a co-located setting, large jamming signals from one transmitter can radiate into the antenna system of a second transmitter. The signals enter the second transmitter in the reverse direction and mix in the output stage of its power amplifier to produce intermodulation products. These ‘reverse’ intermodulation products get radiated from the antenna system and may fall on the victim receiver's desired channel. The paper proposes an architecture that regenerates an estimate of the reverse intermodulation products using the fundamental jammer components and mitigates them in a baseband postdistortion cancellation circuit. A novel multiple-front-end receiver architecture is developed to overcome the high sample rate requirements if the jammers are well out of band. However, this leads to a frequency offset problem in the regenerated distortion estimate. Signal correlation is used to align the frequency, phase and amplitude of the distortion estimate with the interfering reverse intermodulation product. Simulations and theoretical analysis show the output signal-to-interference ratio (SIR) of the system is independent of the input SIR but dependent on the equivalent number of uncorrelated samples in the averaging block. A hardware prototype demonstrated a 16 dB reduction of the interfering reverse intermodulation product.

Published in:

Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:60 ,  Issue: 6 )