4.7 Article

Sum-SE for Multigroup Multicast Cell-Free Massive MIMO With Multi-Antenna Users and Low-Resolution DACs

Journal

IEEE WIRELESS COMMUNICATIONS LETTERS
Volume 10, Issue 8, Pages 1702-1706

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2021.3077900

Keywords

Downlink; Quantization (signal); Unicast; Massive MIMO; Channel estimation; Interference; Gain; Cell-free massive MIMO; low-resolution DACs; multigroup multicast; spectral efficiency

Funding

  1. National Science Foundation of China [62071246, 61861039, 61801132, 61427801]
  2. National Key Research and Development Program of China [2020YFB1806608, 2018YFC1314903]
  3. Science and Technology Project Foundation of Gansu Province [18YF1GA060]
  4. Natural Science Foundation of Guangdong Province of China [2018A030310338, 2020A1515010484]
  5. Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX20_0709]

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The study investigates the impact of multi-antenna on users and access points, and low-resolution DACs on multi-group multicast wireless MIMO systems. It shows that multicast is better than unicast when SE is small, and full-resolution can be replaced by 5-bit low-resolution DACs.
In this letter, we investigate the impact of multi-antenna on both users and access points (APs), and low-resolution digital-to-analog converters (DACs) on multigroup multicast cell-free massive multi-input multi-output (MIMO) systems. With the distributed conjugate beamforming receiver and the generalized additive quantization noise model, we derive a closed-form expression for the achievable downlink sum spectral efficiency (SE), which provides us a vigorous tool for easily evaluating the impacts of key parameters. Due to the joint influence of channel hardening property, multi-antenna gain, and intra-group interference, the research becomes sophisticated particularly. Typically, when the sum-SE is small, the multicast is better than the unicast, and vice versa. Besides, it reveals that the full-resolution can be replaced by 5-bit low-resolution DACs to achieve the same performance, and the additional antenna at users can effectively enhance the system performance.

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