TY - JOUR
T1 - Spectral and Energy Efficiency of IRS-Assisted MISO Communication with Hardware Impairments
AU - Zhou, Shaoqing
AU - Xu, Wei
AU - Wang, Kezhi
AU - Di Renzo, Marco
AU - Alouini, Mohamed-Slim
PY - 2020/9/1
Y1 - 2020/9/1
N2 - In this letter, we analyze the spectral and energy efficiency of an intelligent reflecting surface (IRS)-assisted multiple-input single-output (MISO) downlink system with hardware impairments. An extended error vector magnitude (EEVM) model is utilized to characterize the impact of radio-frequency (RF) impairments at the access point (AP) and phase noise is considered at the IRS. We show that the spectral efficiency is limited due to the hardware impairments even when the numbers of AP antennas and IRS elements grow infinitely large, which is in contrast with the conventional case with ideal hardware. Moreover, the performance degradation at high SNR is shown to be mainly affected by the AP hardware impairments rather than by the phase noise at the IRS. We further obtain in closed form the optimal transmit power for energy efficiency maximization. Simulation results are provided to verify the obtained results.
AB - In this letter, we analyze the spectral and energy efficiency of an intelligent reflecting surface (IRS)-assisted multiple-input single-output (MISO) downlink system with hardware impairments. An extended error vector magnitude (EEVM) model is utilized to characterize the impact of radio-frequency (RF) impairments at the access point (AP) and phase noise is considered at the IRS. We show that the spectral efficiency is limited due to the hardware impairments even when the numbers of AP antennas and IRS elements grow infinitely large, which is in contrast with the conventional case with ideal hardware. Moreover, the performance degradation at high SNR is shown to be mainly affected by the AP hardware impairments rather than by the phase noise at the IRS. We further obtain in closed form the optimal transmit power for energy efficiency maximization. Simulation results are provided to verify the obtained results.
KW - Intelligent reflecting surface
KW - energy efficiency
KW - hardware impairments
KW - spectral efficiency
UR - http://www.scopus.com/inward/record.url?scp=85091131839&partnerID=8YFLogxK
U2 - 10.1109/lwc.2020.2990431
DO - 10.1109/lwc.2020.2990431
M3 - Letter
SN - 2162-2337
VL - 9
SP - 1366
EP - 1369
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 9
M1 - 9079457
ER -