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Enhanced inter-lighting interference cancellation using power control to improve the performance of indoor visible light communication systems
摘要： In this study, the authors propose an enhanced inter-lighting interference cancellation (E-ILIC) in order to distinguish the received signals, combating the equal powers at the receiver side and hence improve the average bit error rate (BER) performance of a multiple-input-single-output visible light communication (VLC) system. VLC is a promising technology for indoor environments, it makes use of the light emitting diode (LED) lamps already installed to transmit information through the visible light. When several LEDs transmit simultaneously different data to increase the transmission capacity, it leads to co-channel interference that degrades the BER performance. For this reason, they investigate E-ILIC that is a combination of ILIC with closed loop power control to receive the signals with different power level. It employs power allocation at the transmitter when the received power ratio does not comply with a specific threshold. Furthermore, it reduces significantly the interference between adjacent LED lamps, obtaining useful information at the receiver side. Through computer simulations, E-ILIC achieves the best average BER performance in any user position when the assignment of the power weights is correctly performed on the LEDs.
关键词： MISO,bit error rate,co-channel interference,CCI,BER,visible light communication,inter-lighting interference cancellation,multiple-input-single-output,ILIC,VLC,power control
更新于2025-09-10 09:29:36
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[IEEE 2018 IEEE 5G World Forum (5GWF) - Silicon Valley, CA (2018.7.9-2018.7.11)] 2018 IEEE 5G World Forum (5GWF) - Energy-Efficient Downlink Power Control in mmWave Cell-Free and User-Centric Massive MIMO
摘要： This paper considers cell-free and user-centric approaches for coverage improvement in wireless cellular systems operating at millimeter wave frequencies, and proposes downlink power control algorithms aimed at maximizing the global energy efficiency. To tackle the non-convexity of the problems, an interaction between sequential and alternating optimization is considered. The use of hybrid analog/digital beamformers is also taken into account. The numerical results show the benefits obtained from the power control algorithm, as well as that the user-centric approach generally outperforms the cell-free one.
关键词： downlink power control,massive MIMO,user-centric,energy efficiency,mmWave,cell-free
更新于2025-09-04 15:30:14