Performance of Cell-Free Distributed Antenna System with Adaptive-Resolution ADCs

研究成果: Article査読

抄録

In this paper, we propose a cell-free distributed antenna system (DAS) architecture with adaptive resolution- (AR-) analog-to-digital converters (ADCs) in access points (APs). The proposed scheme adopts accurate models of the combined effects of clipping, quantization, and thermal noise in the ADC to analyze the quantization characteristics with different resolutions at different received signal-to-interference-and-noise ratios (SINRs). The proposed resolution bit selection criterion of the AR-ADC scheme is then applied. The AR-ADC scheme is to minimize the ADC resolution bits under allowable quantization distortion, and obtain the corresponding optimal clipping factor of the signal-to-interference-plus-quantization-and-noise ratio (SIQNR) for the desired received signal. The contributions of this paper are as follows; 1) the AR-ADC scheme provides a receiver architecture that realizes better energy efficiency (EE), 2) the spectral efficiency (SE) performance is improved by allocating more resolution bits to the APs closer to each UE with the proposed criterion. Numerical results demonstrate that the proposed AR-ADC scheme improves the EE more than tenfold as compared with the other schemes except the system with only 1−bit ADCs. Moreover, the proposed AR-ADC doubles the SE as compared with the system with only 1−bit ADCs.

本文言語English
ページ(範囲)90-99
ページ数10
ジャーナルITE Transactions on Media Technology and Applications
10
3
DOI
出版ステータスPublished - 2022

ASJC Scopus subject areas

  • 信号処理
  • メディア記述
  • コンピュータ グラフィックスおよびコンピュータ支援設計

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