期刊
IEEE INTERNET OF THINGS JOURNAL
卷 9, 期 12, 页码 9625-9639出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JIOT.2021.3130026
关键词
Channel estimation; Downlink; Correlation; Rician channels; NOMA; Internet of Things; Uplink; Cell-free massive multiple-input-multiple-output (mMIMO); nonorthogonal multiple access (NOMA); performance analysis; power control
资金
- National Key Research and Development Program of China [2020YFB1807201]
- National Natural Science Foundation of China [61971027, 61971467, U1834210, 61961130391]
- Beijing Natural Science Foundation [L202013]
- UNSW Digital Grid Futures Institute, UNSW, Sydney
- Australian Research Council's Discovery Project [DP210102169]
This article investigates the performance of NOMA-based cell-free mMIMO for IoT considering spatially correlated Rician fading channels. The closed form expressions for SE and energy efficiency are derived, considering imperfect successive interference cancellation and pilot contamination. The results show that the magnitude of spatial correlation negligibly affects the SE in spatially correlated Rician fading channels, and NOMA-based cell-free mMIMO provides significant performance gain compared to conventional orthogonal multiple-access schemes.
This article investigates the performance of nonorthogonal multiple access (NOMA)-based cell-free massive multiple-input-multiple-output (mMIMO) for the Internet of Things (IoT) considering spatially correlated Rician fading channels. The exact closed form of downlink spectral efficiency (SE) and energy efficiency expressions is derived with three estimators and the maximum ratio transmission by taking the impacts of imperfect successive interference cancellation and pilot contamination into account. Subsequently, the performance of a local-MMSE precoder with the three aforementioned estimators is analyzed. Then, a large-scale fading-based user pairing scheme is proposed to further analyze the system SE. Besides, we formulate the optimum power control design as a max-min problem and a computational efficient suboptimal algorithm is proposed based on the successive convex approximation. Furthermore, our results reveal that the magnitude of the spatial correlation negligibly effects the SE in spatially correlated Rician fading channels. Then, numerical results confirm the positive effect of the proposed power control scheme. Also, our results further illustrate that NOMA-based cell-free mMIMO for IoT provides significant performance gain compared with its counterpart deploying conventional orthogonal multiple-access schemes.
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