Spectral efficiency analysis for massive MIMO systems in Ricean fading channels. Issue 19 (1st December 2019)

• Record Type: Journal Article
• Authors: Xin, Yuanxue; Zhang, Rongqing; Shi, Pengfei; Su, Xin; Zhang, Xuewu
• Is Part Of: IET communications. Volume 13:Issue 19(2019)
• Page Start: 3193
• Page End: 3200
• Publication Date: 2019-12-01
• Subjects: channel estimation -- MIMO communication -- Rician channels -- antenna arrays -- least mean squares methods -- radio receivers; downlink transmissions -- uplink pilot sequence -- minimum mean square error estimator -- equivalent channel model -- joint MMSE receiver -- uplilnk achievable sum‐rate -- asymptotic spectral efficiency -- system parameters design -- block fading channels -- satisfying system performance -- spectral efficiency analysis -- massive MIMO systems -- Ricean fading channels -- massive multiple‐input–multiple‐output systems -- channel reciprocity; Telecommunication systems -- Periodicals; Speech processing systems -- Periodicals; 621.38205
• DOI: 10.1049/iet-com.2019.0668
• Languages: English
• ISSNs: 1751-8628

Abstract

Abstract : This study focuses on the spectral efficiency of massive multiple‐input–multiple‐output (MIMO) systems over Ricean fading channels. Assuming the channel reciprocity of uplink and downlink transmissions, the channels are estimated through uplink pilot sequence with least minimum mean square error (MMSE) estimator, which facilitates the investigation of equivalent channel model. With the equivalent channel model, adopting joint MMSE receiver, the uplilnk achievable sum‐rate is studied, and finally, the asymptotic expression of spectral efficiency is obtained. Based on the proposed asymptotic spectral efficiency, numerical results give some guidelines about system parameters design: the authors should choose a proper length of the block fading channels to reduce the effect of pilot overhead, and an optimal length of pilot sequence always exists to guarantee a satisfying system performance in terms of spectral efficiency. Furthermore, the simulation results show that when fixing the number of users, shrinking the cell serving area and increasing the number of antennas can improve the system performance.