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

被引:48
|
作者
Chen, Shuaifei [1 ,2 ]
Zhang, Jiayi [1 ,2 ]
Zhang, Jing [1 ,2 ]
Bjornson, Emil [3 ,4 ]
Ai, Bo [2 ,5 ]
机构
[1] Beijing Jiaotong Univ, Sch Elect & Informat Engn, Beijing 100044, Peoples R China
[2] Beijing Jiaotong Univ, Frontiers Sci Ctr Smart High Speed Railway Syst, Beijing 100044, Peoples R China
[3] KTH Royal Inst Technol, Dept Comp Sci, SE-16440 Kista, Sweden
[4] Linkoping Univ, Dept Elect Engn ISY, SE-58183 Linkoping, Sweden
[5] Beijing Jiaotong Univ, State Key Lab Rail Traff Control & Safety, Beijing 100044, Peoples R China
基金
瑞典研究理事会; 国家重点研发计划; 北京市自然科学基金;
关键词
6G network; User-centric cell-free network; Massive multiple-input multiple-output; OPTIMAL POWER-CONTROL; ULTRA-DENSE NETWORKS; DISTRIBUTED STRATEGIES; ENERGY EFFICIENCY; PILOT ASSIGNMENT; UPLINK; WIRELESS; ACCESS; OPTIMIZATION; ALLOCATION;
D O I
10.1016/j.dcan.2021.12.005
中图分类号
TN [电子技术、通信技术];
学科分类号
0809 ;
摘要
The mobile data traffic has been exponentially growing during the last several decades. This 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 variations. Cell-Free (CF) mMIMO, which combines the best aspects of UDN and mMIMO, is viewed as a key solution to this issue. In such systems, each User Equipment (UE) is served by a preferred set of surrounding APs cooperatively. In this paper, we provide a survey of the state-of-the-art literature on CF mMIMO. As a starting point, the significance and the basic properties of CF mMIMO are highlighted. We 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 algorithms. After that, we discuss the practical issues in implementing CF mMIMO and point out the potential future directions. Finally, we conclude this paper with a summary of the key lessons learned in this field.
引用
收藏
页码:695 / 719
页数:25
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