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A survey on user-centric cell-free massive MIMO systems

Digital Communications and Networks 2022年第5期8卷 695-719页

作者： Shuaifei Chen Jiayi Zhang Jing Zhang emil björnson Bo Ai School of Electronic and Information Engineering Beijing Jiaotong UniversityBeijing100044China Frontiers Science Center for Smart High-speed Railway System Beijing Jiaotong UniversityBeijing100044China Department of Computer Science KTH Royal Institute of TechnologySE-16440KistaSweden Department of Electrical Engineering(ISY) Linköping UniversitySE-58183LinköpingSweden State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing100044China

The mobile data traffic has been exponentially growing during the last several *** was enabled by the densification of the network infrastructure in terms of increased cell density(i.e.,Ultra-Dense Network(UDN))and/or the increased number of active antennas per Access Point(AP)(i.e.,massive Multiple-Input Multiple-Output(mMIMO)).However,neither UDN nor mMIMO will meet the increasing demand for the data rate of the Sixth Generation(6G)wireless communications due to the inter-cell interference and large quality-of-service ***-Free(CF)mMIMO,which combines the best aspects of UDN and mMIMO,is viewed as a key solution to this *** such systems,each User Equipment(UE)is served by a preferred set of surrounding APs *** this paper,we provide a survey of the state-of-the-art literature on CF *** a starting point,the significance and the basic properties of CF mMIMO are *** then present the canonical framework to discuss the essential details(i.e.,transmission procedure and mathematical system model).Next,we provide a deep look at the resource allocation and signal processing problems related to CF mMIMO and survey the up-to-date schemes and *** that,we discuss the practical issues in implementing CF mMIMO and point out the potential future ***,we conclude this paper with a summary of the key lessons learned in this field.

关键词： 6G network User-centric cell-free network Massive multiple-input multiple-output

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Performance Analysis and Power Control of Cell-Free Massive MIMO Systems with Hardware Impairments

Performance Analysis and Power Control of Cell-Free Massive ...

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2018中国信息通信大会(CICC2018)

作者： Jiayi Zhang Yinghua Wei emil bj?rnson Yu Han Shi Jin

As an interesting network architecture for future wireless communication systems,cell-free（CF）massive multiple-input multiple-output（MIMO）distributes an excess number of access points（APs）with single or multiple antennas to coop-eratively communicate with several user equipments（UEs）.To realize CF massive MIMO in production,hardware impairments become a crucial problem since cheaper and low-quality antennas are needed to ensure economic and energy *** this paper,we propose a framework for performance analysis in CF massive MIMO with classical hardware distortion *** downlink,closed-form spectral efficiency expressions are *** on these results,we provide significant insights into the practical impact of hardware impairments on CF massive *** example,the impact of hardware distortion at the APs asymptotically ***,in order to ensure uniformly good service to the users,we propose a max-min power control algorithm to maximize the minimum UE *** analytical and numerical results,we prove that CF massive MIMO can tolerate hardware impairments without performance reduction.

关键词： CF massive MIMO spectral efficiency energy efficiency power control hardware impairments

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