期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 72, 期 4, 页码 5468-5472出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2022.3227408
关键词
Massive access; interference-aware; cell-free massive MIMO; pilot assignment; user scheduling
This paper proposes an interference-aware massive access (IAMA) scheme for cell-free massive MIMO systems. It focuses on joint AP-UE association and pilot assignment to optimize user fairness and average spectral efficiency. The proposed scheme outperforms benchmark schemes in terms of these metrics.
Cell-free massive multiple-input multiple-output (CF mMIMO) provides good interference management by coordinating many more access points (APs) than user equipments (UEs). It becomes challenging to determine which APs should serve which UEs with which pilots when the number of UEs approximates the number of APs and far exceeds the number of pilots. Compared to the previous work, a better compromise between spectral efficiency (SE) and implementation simplicity is needed in such massive access scenarios. This paper proposes an interference-aware massive access (IAMA) scheme realizing joint AP-UE association and pilot assignment for CF mMIMO by exploiting the large-scale interference features. We propose an interference-aware reward as a novel performance metric and use it to develop two iterative algorithms to optimize the association and pilot assignment. The numerical results show a prominent advantage of our IAMA scheme over the benchmark schemes in terms of the user fairness and the average SE.
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