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Iterative Analog-Digital Multi-User Equalizer for Wideband Millimeter Wave Massive MIMO Systems.

Roberto Magueta1, Daniel Castanheira1, Pedro Pedrosa1

  • 1Instituto de Telecomunicações (IT) and Departamento de Eletrónica, Telecomunicações e Informática (DETI), University of Aveiro, 3810-193 Aveiro, Portugal.

Sensors (Basel, Switzerland)
|January 24, 2020
PubMed
Summary

This study introduces an iterative analog-digital equalizer for wideband millimeter-wave systems. The novel equalizer enhances performance in frequency-selective channels, approaching full-digital capabilities.

Keywords:
hybrid analog–digital architecturesiterative analog–digital equalizermassive MIMOmillimeter-wave communications

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Area of Science:

  • Wireless Communications
  • Signal Processing
  • Massive MIMO Systems

Background:

  • Previous hybrid beamforming research primarily addressed narrowband channels.
  • Millimeter-wave (mmWave) communication necessitates efficient solutions for wideband, frequency-selective channels.
  • Massive MIMO systems offer significant capacity but require advanced equalization techniques.

Purpose of the Study:

  • To propose an iterative analog-digital multi-user equalizer for uplink wideband mmWave massive MIMO systems.
  • To address the challenges of frequency-selective channels in wideband mmWave communications.
  • To develop an efficient equalization scheme that balances performance and complexity.

Main Methods:

  • An iterative analog-digital equalizer is proposed, updating both analog and digital components based on previous iteration estimates.
  • The equalizer design minimizes the sum of mean square error across subcarriers, with a fixed analog part and per-subcarrier digital part.
  • A sequential approach is used to optimize analog phase shifters for each radio frequency (RF) chain, and a semi-analytical method derives the bit error rate (BER).

Main Results:

  • The proposed iterative equalizer achieves performance close to a full-digital system.
  • It significantly outperforms existing hybrid equalizer schemes for wideband mmWave massive MIMO.
  • The method effectively handles frequency-selective channels inherent in wideband mmWave communication.

Conclusions:

  • The developed iterative analog-digital multi-user equalizer is a viable and high-performing solution for wideband mmWave massive MIMO systems.
  • This approach offers a practical method for improving uplink communication in challenging mmWave environments.
  • The study demonstrates the effectiveness of iterative optimization in hybrid analog-digital equalization.