مهرداد تيموري كرويق

Abstract—In collocated massive MIMO networks, due to the weak signals of cell-edge users, severe intercellular interference and high power consumption, several problems have been created in the implementation of these networks. Also, charging and replacing batteries with limited power and permanent support for them in IoT networks is not an easy task. Therefore, in this paper, cell-free massive MIMO systems (CF-mMIMO) and simultaneous wireless information and power transfer technology (SWIPT) have been studied. The method of user-centric AP selection and optimization of the trade-off performance between spectral efficiency and energy efficiency in the SWIPT power splitting receiver with a CF-mMIMO system is proposed. In the following, a trade-off between spectral efficiency and energy efficiency is analyzed and an eva‎luation index for this trade-off is proposed, which is the product of two efficiencies. By optimizing the proposed eva‎luation index due to the number of access points and power splitting ratio of the SWIPT receiver, the trade-off performance of spectral efficiency and energy efficiency has been optimized. This optimization leads to a non-convex problem which, with the help of the proposed approximation and iterative algorithm, turns to a convex geometric programming (GP) problem and then it solves. The simulation results show that with the help of the proposed AP selection scheme and the appropriate power splitting of the DL and UL, the use of maximal ratio transmission (MRT) encoding on the APs improves the performance of the SWIPT system and the use of the zero forcing (ZF) scheme on the CPU improves the trade-off between spectral efficiency and energy efficiency.

انتقال همزمان اطلاعات و توان بي‌سيم , سيستم انبوه آنتني بدون سلول , انتخاب نقطه دسترسي منعطف , پروتكل مقسم توان

Cell-free Massive MIMO , simultaneous wireless information and power transmission , flexible AP selection , power splitting protocol

Mehrdad Teimoury Karvigh

S. Mohammad Razavizadeh