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Digital Predistortion Equalizer using a Finite Impulse Response (FIR) Filter Implemented on FPGA

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posted on 2022-10-18, 20:41 authored by Bassam Nima, Yanan Li, Zhenyu ZhangZhenyu Zhang

This manuscript proposed an innovative digital predistortion equalizer using the LMS algorithm. In this article, we used self-made nonlinear circuit boards cascaded with an off-the-shelf RF amplifier to mimic the distorted intermediate frequency (IF) response of a wireless communication system. After applying our proposed algorithm, our prototype demonstrated adaptive equalization within 2 dB bandwidth in the 0.2 - 0.8 Nyquist frequency range (10 - 40 MHz in our case). At this range, the equalizer kept the phase response relatively linear with a group delay less than 10ns. It is foreseeable that our proposed adaptive digital equalizer can be widely used in wireless communication systems.


Email Address of Submitting Author

Submitting Author's Institution

University of Alberta

Submitting Author's Country

  • Canada

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