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Concurrent Multi-Beam Digital Predistortion Using FFT Beamforming and Virtual Arrays.

Björn Langborn1, Christian Fager2, Rui Hou2,3

  • 1Department of Electrical Engineering, Chalmers University of Technology, 412 96 Göteborg, Sweden.

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Summary

This study introduces a digital predistortion (DPD) method for concurrent multi-beam transmission in digital multiple-input, multiple-output (MIMO) systems. The proposed virtual-array processing significantly reduces DPD complexity for large MIMO systems.

Keywords:
FFT beamformingMIMObeam domaindigital predistortionmulti-beampower amplifierprecodingvirtual array

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Wireless Communications

Background:

  • Nonlinear power amplifiers (PAs) in multiple-input, multiple-output (MIMO) systems generate intermodulation products during concurrent multi-beam transmission.
  • Linearizing each PA individually in large MIMO arrays is computationally expensive and impractical.

Purpose of the Study:

  • To propose a novel digital predistortion (DPD) scheme for concurrent multi-beam transmission in fully digital MIMO systems.
  • To reduce the complexity of DPD in large MIMO systems while maintaining signal linearity.

Main Methods:

  • The proposed scheme utilizes Fast Fourier Transform (FFT) beamforming and virtual-array processing.
  • DPD is applied in a virtual array, significantly smaller than the physical MIMO array.
  • Theoretical derivations and simulation examples are used to validate the approach.

Main Results:

  • Concurrent multi-beam transmission in MIMO systems creates intermodulation products affecting both user and non-user directions.
  • The virtual-array processing approach effectively linearizes the system by predistorting user beams and non-user intermodulation products.
  • Significant reductions in DPD complexity are demonstrated through theoretical analysis and simulations.

Conclusions:

  • The proposed DPD scheme offers a computationally efficient solution for linearizing concurrent multi-beam transmissions in large digital MIMO systems.
  • Virtual-array processing is a viable strategy to manage DPD complexity in systems with a large number of antennas and few users.
  • This approach enables cost-effective implementation of advanced wireless communication systems.