Open AccessPower Optimization in Cell‐Free Massive MIMO with Non‐ideal Hardware Transceiver
Author(s) -
Zhang Yao,
Cao Haotong,
Zhou Meng,
Li Long,
Yang Longxiang
Publication year - 2020
Publication title -
chinese journal of electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.267
H-Index - 25
eISSN - 2075-5597
pISSN - 1022-4653
DOI - 10.1049/cje.2019.12.005
Subject(s) - telecommunications link , computer science , transceiver , beamforming , quality of service , mimo , precoding , power control , transmitter power output , computer hardware , spectral efficiency , power (physics) , real time computing , algorithm , computer network , transmitter , telecommunications , channel (broadcasting) , wireless , physics , quantum mechanics
A downlink cell‐free massive Multipleinput multiple‐output (mMIMO) system is explored. To investigate the impact of hardware distortion on downlink cell‐free mMIMO, this paper recalls a well‐established model of hardware impairment and derives a new closedform downlink per‐user Spectral efficiency (SE) expression for distributed conjugate beamforming precoding. Based on this trackable expression, two power control algorithms, namely max‐total‐SE and mixed Quality‐of‐service (QoS) algorithms, are proposed. Numerical results indicate that the downlink per‐user SE is primarily limited by the hardware quality of the receiver, especially when the user corresponds to the receiver. In addition, the proposed max‐total‐SE algorithm has a fast convergence rate and can significantly improve the total SE compared to the Equal power control (EPC) scheme. What's more, our mixed QoS algorithm also performs well in many respects.