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Digital Predistortion Equalizer using a Finite Impulse Response (FIR) Filter Implemented on FPGA
  • Bassam Nima ,
  • Yanan Li ,
  • Zhenyu Zhang
Bassam Nima
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Zhenyu Zhang
University of Alberta

Corresponding Author:[email protected]

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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.