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Antenna Combining for Interference Limited MIMO Cellular Networks.

Tae-Kyoung Kim1

  • 1Department of Electronics, Information and Communication Engineering, Mokpo National University, Muan, Jeonnam 58554, Korea.

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|August 6, 2020
PubMed
Summary
This summary is machine-generated.

This study analyzes antenna combining in cellular networks, finding that interference degrades performance. An optimization solution is proposed to maximize spectral efficiency by selecting antenna combining strategies.

Keywords:
cellular networkslimited feedbackmultiuser multi-input multi-output (MU-MIMO)quantization-based combiningzero-forcing beamforming (ZFBF)

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Area of Science:

  • Wireless communication networks
  • Signal processing in telecommunications

Background:

  • Cellular networks utilize multi-antenna base stations (BSs) and users for simultaneous data transmission.
  • Zero-forcing beamforming with partial channel state information (CSI) is employed for spatial division multiplexing.
  • Quantization-based combining (QBC) reduces quantization error but suffers from inter-cell interference.

Purpose of the Study:

  • To analyze the degradation of QBC gain due to inter-cell interference in downlink cellular networks.
  • To investigate the impact of antenna combining on ergodic spectral efficiency and optimal feedback bits.
  • To propose an optimized antenna combining strategy to maximize spectral efficiency.

Main Methods:

  • Analysis of QBC degradation using spherical-cap approximation of vector quantization (SCVQ).
  • Investigation of ergodic spectral efficiency and optimal feedback bits based on SCVQ.
  • Development of an optimization solution considering expected beamforming vectors from other cells.

Main Results:

  • Inter-cell interference significantly degrades the gain of conventional QBC.
  • SCVQ analysis quantifies the impact of quantization error and interference on performance.
  • The proposed optimization solution effectively maximizes spectral efficiency.

Conclusions:

  • Antenna combining strategies are crucial for mitigating interference and enhancing cellular network performance.
  • The proposed optimization method offers a significant improvement over conventional approaches.
  • This research provides valuable insights for designing efficient downlink cellular systems.