期刊
IEEE OPEN JOURNAL OF THE COMMUNICATIONS SOCIETY
卷 3, 期 -, 页码 1244-1251出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/OJCOMS.2022.3195756
关键词
Optimization; Downlink; Channel estimation; Transforms; OFDM; Central Processing Unit; Antenna arrays; Cell-free massive MIMO; fronthaul link capacity constraint; quadratic transform; user rate optimization
资金
- National Natural Science Foundation of China [62071485, 61901519, 62001513]
- Natural Science Foundation of Jiangsu Province [BK20201334, BK20200579]
- Basic Research Project of Jiangsu Province [BK20192002]
Cell-free massive MIMO networks provide high spectral efficiency and uniform signal coverage for smart city applications, but the limited capacity of the fronthaul link constrains the optimization of user rate. This paper proposes QT-MM and QT-SM optimization algorithms for CF mMIMO OFDM systems, which effectively prevent very low user rates when the fronthaul capacity is limited.
As a promising candidate for the future generations of mobile communication networks, the cell-free (CF) massive multiple-input multiple-output (mMIMO) networks have been shown to provide high spectral efficiency (SE) and more uniform signal coverage than cellular mMIMO networks, enabling smart cities more diverse application services. The fronthaul link in such networks, defined as the transmission link between the central processing unit and the access point, requires a high capacity, but is often constrained. Hence, the optimization of the user rate under the limited capacity of fronthaul is the key problem to be solved in a CF networks. In this paper, we consider the downlink transmission of CF mMIMO orthogonal frequency division multiplexing (OFDM) systems with constrained transmit power and fronthaul capacity. Based on the min-max and sum-max principles, quadratic transform-min max (QT-MM) and quadratic transform-sum max (QT-SM) optimization algorithms are proposed, respectively. Simulation results show that compared with the weighted minimum mean square error (WMMSE) algorithm, both of the proposed algorithms can effectively prevent very low user rates when the fronthaul capacity is limited. When the fronthaul link capacity constraint is high, the QT-SM algorithm has better rate performance than the distributed WMMSE-d algorithm and the centralized WMMSE-c algorithm.
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