南方科技大学知识苑(SUSTech KC): Cell-Free Massive MIMO-OFDM: Asynchronous Reception and Uplink Performance Analysis

题名	Cell-Free Massive MIMO-OFDM: Asynchronous Reception and Uplink Performance Analysis
作者	Guoyu Li 1; Changsheng You2 ; Shaochuan Wu 1; Wenbin Zhang 1; Guanyu Shang 3; Xiaokang Zhou 1
DOI	10.1109/WCNC57260.2024.10570603
发表日期	2024-04-24
ISSN	1525-3511
ISBN	979-8-3503-0359-9
会议录名称	2024 IEEE Wireless Communications and Networking Conference (WCNC)
会议日期	21-24 April 2024
会议地点	Dubai, United Arab Emirates
摘要	Cell-free (CF) massive multiple-input multiple-output (mMIMO) is a promising technology for enhancing the spectrum efficiency in future wireless systems. It leverages distributed access points (APs) to jointly serve multiple users over the same time-frequency resource. In this paper, we study the uplink performance of CF mMIMO orthogonal frequency division multiplexing (OFDM) wireless systems under asynchronous signal reception. First, we provide a complete and detailed frequency-domain uplink asynchronous signal reception model for CF mMIMO-OFDM systems, which shows that asynchronous reception introduces phase shift, inter-carrier interference (ICI), and inter-symbol interference (ISI) at the receivers. Then, we design the minimum mean square error channel estimation under asynchronous reception. The results indicate that the phase shift, ICI, and ISI destroy the orthogonality of pilot sequences at APs, leading to significant channel estimation error. Furthermore, the FDM pilot sequences prove to be more effective in mitigating the impact of asynchronous reception on channel estimation compared to the CDM pilot sequences. Given the imperfect channel state information caused by pilot contamination and asynchronous reception, we characterize the uplink achievable spectral efficiency under asynchronous reception. The results indicate that severe uplink rate loss mainly arises from phase shift caused by asynchronous reception. Numerical simulation results corroborate our analyses.
学校署名	其他
相关链接	[IEEE记录]
收录类别	EI
引用统计
成果类型	会议论文
条目标识符	http://sustech.caswiz.com/handle/2SGJ60CL/789219
专题	工学院_电子与电气工程系
作者单位	1.School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin, China 2.Department of Electronic and Electrical Engineering, Southern University of Science and Technology, Shenzhen, China 3.Advanced Microscopy and Instrumentation Research Center, Harbin Institute of Technology, Harbin, China
推荐引用方式 GB/T 7714	Guoyu Li,Changsheng You,Shaochuan Wu,et al. Cell-Free Massive MIMO-OFDM: Asynchronous Reception and Uplink Performance Analysis[C],2024.