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Low-Complexity Distance-Based Scheduling for Multi-User XL-MIMO Systems

José P. González-Coma, F. Javier López-Martínez, Luis Castedo

Abstract

We introduce DBS, a new technique for user selection in downlink multi-user communications with extra-large (XL) antenna arrays. DBS categorizes users according to their equivalent distance to the antenna array. Such categorization effectively accounts for inter-user interference while largely reducing the computational burden. Results show that (i) DBS achieves the same performance as the reference zero-forcing beamforming scheme with a lower complexity; (ii) a simplified version of DBS achieves a similar performance when realistic spherical-wavefront (SW) propagation features are considered; (iii) SW propagation brings additional degrees of freedom, which allows for increasing the number of served users.

Low-Complexity Distance-Based Scheduling for Multi-User XL-MIMO Systems

Abstract

We introduce DBS, a new technique for user selection in downlink multi-user communications with extra-large (XL) antenna arrays. DBS categorizes users according to their equivalent distance to the antenna array. Such categorization effectively accounts for inter-user interference while largely reducing the computational burden. Results show that (i) DBS achieves the same performance as the reference zero-forcing beamforming scheme with a lower complexity; (ii) a simplified version of DBS achieves a similar performance when realistic spherical-wavefront (SW) propagation features are considered; (iii) SW propagation brings additional degrees of freedom, which allows for increasing the number of served users.

Paper Structure

This paper contains 7 sections, 15 equations, 3 figures, 2 tables, 1 algorithm.

Table of Contents

  1. Introduction
  2. System model
  3. User scheduling in XL-MIMO
  4. Distance-Based Scheduling
  5. Simplified DBS
  6. Numerical results
  7. Conclusion

Figures (3)

  • Figure 1: Achievable sum rate vs. SNR (dB) for $M=1000$ antennas. Parameter values are given in Table \ref{['tab:Sim1']}. Solid/dashed lines correspond to the SW/PW models, respectively.
  • Figure 2: Number of served users vs. SNR (dB) for $M=1000$ antennas. Parameter values are given in Table \ref{['tab:Sim1']}. Solid/dashed lines correspond to the SW/PW models, respectively.
  • Figure 3: Achievable sum rate vs. number of antennas $M$ for SNR$=25$ dB. Parameter values are given in Table \ref{['tab:Sim1']}. Solid/dashed lines correspond to the SW/PW models, respectively.