A Gradual Method for Channel Non-reciprocity Calibration in Cell-free Massive MIMO
- Kim, N.; Yu, C.; Hong, S.; Na, J.; Chung, B.C.
- Issue Date
- Institute of Electrical and Electronics Engineers Inc.
- Cell-free massive MIMO; Channel reciprocity; Precoding; Time division duplexing (TDD); Ultra dense network
- IEEE Communications Letters, v.26, no.11, pp.1 - 1
- Journal Title
- IEEE Communications Letters
- Start Page
- End Page
- This paper proposes a method for gradually calibrating channel non-reciprocity in an ultra-dense cell-free massive multiple-input multiple-output (MIMO) system. Many studies assume perfect channel reciprocity in time division duplex (TDD) systems. However, reciprocity is not valid in actual channels. Therefore, determining the reciprocity-calibrated precoding matrix is important for the performance of the network. In a cell-free massive MIMO system, user equipment (UE) is served by many access nodes (ANs). Since there are many nodes, it is difficult to calibrate the matrix simultaneously. Using the proposed method, the network sequentially calibrates the precoding matrix in order of influence. Thus, the proposed method can obtain a large gain compared to a system without calibration by performing only minimal channel calibration. To show the capacity gain of the proposed method, a simulation was performed considering the overhead required for channel calibration. IEEE
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- 해양과학대학 > 지능형통신공학과 > Journal Articles
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