Harald Haas

Oct 24, 2024 | onlinelibrary.wiley.com | Kou Yoshida |Cheng Chen |Harald Haas |Graham Turnbull

1 Introduction Visible light communication (VLC) is of growing importance to address the significant increase in global demands for wireless communication bandwidth, as a complement to conventional radio frequency (RF) technologies used in Wi-Fi and mobile phones. Because light consists of electromagnetic waves with much higher frequencies than those used in RF technologies, optical communication can potentially provide several hundreds of terahertz bandwidth, that is freely available.

Jan 5, 2024 | opg.optica.org | Xin Zhong |CHEN CHEN |Harald Haas |Min Liu

In this Letter, we propose and demonstrate a dual-mode spatial index modulation (DM-SIM) scheme for spectral efficiency enhancement of band-limited multiple-input multiple-output optical wireless communication (MIMO-OWC) systems. By performing dual-mode index modulation in the spatial domain, DM-SIM can transmit both spatial and constellation symbols.

Aug 16, 2023 | researchgate.net | Harald Haas

Huangetal.in[22].ThetheoreticalsystemworksbyderivingthelocationofthereceiverbasedontheLi-FisignalidentifierandthenobtainingthedistancebetweenaWi-FiaccesspointandtheidentifiedLi-FilampusingcoefficientcalibrationwiththeRSSIvaluesofWi-Fiaccesspoints.However,thismodelhasnotyetbeenappliedtoobtainreal-worldresults,althoughitshowspromiseasasolutionforthecomplexityofthefingerprintingapproach.