?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Undersampled+Pulse+Width+Modulation+for+Optical+Camera+Communications&rft.creator=Luo%2C+P&rft.creator=Jiang%2C+T&rft.creator=Haigh%2C+PA&rft.creator=Ghassemlooya%2C+Z&rft.creator=Zvanovec%2C+S&rft.description=An+undersampled+pulse+width+modulation+(UPWM)+scheme+is+proposed+to+enable+users+to+establish+a+non-+flickering+optical+camera+communications+(OCC)+link.+With+UPWM%2C+only+a+digital+light+emitting+diode+(LED)+driver+is+needed+to+send+signals+using+a+higher+order+modulation.+Similar+to+other+undersample-based+modulation+schemes+for+OCC%2C+a+dedicated+preamble+is+required+to+assist+the+receiver+to+indicate+the+phase+error+introduced+during+the+undersampling+process%2C+and+to+compensate+for+nonlinear+distortion+caused+by+the+in-built+gamma+correction+function+of+the+camera.+To+test+the+performance+of+the+UPWM-+based+OCC+system%2C+an+experimental+test-bed+is+developed.+The+experimental+results+show+that+the+proposed+system+is+able+to+achieve+a+data+rate+of+150+bps+(spectrum+efficiency+of+5+bits%2Fsymbol)+at+a+bit+error+rate+of+6.76%C3%9710%5E-4%2C+which+is+well+below+the+forward+error+correction+limit+of+3.8%C3%9710%5E-3%2C+over+a+link+span+of+1+m+using+a+Huawei+Nexus+6P+smartphone+with+a+frame+rate+of+30+fps.&rft.subject=Optical+camera+communications%2C+undersampled+pulse+width+modulation%2C+visible+light+communications&rft.publisher=IEEE&rft.date=2018-01-01&rft.type=Proceedings+paper&rft.publisher=IEEE+International+Conference+on+Communications+(ICC)&rft.language=eng&rft.source=+++++In%3A++Proceedings+of+the+2018+IEEE+International+Conference+on+Communications+Workshops+(ICC+Workshops).++++IEEE%3A+Kansas+City%2C+MO%2C+USA.+(2018)+++++&rft.format=text&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10059302%2F1%2F1570420278.pdf&rft.identifier=https%3A%2F%2Fdiscovery.ucl.ac.uk%2Fid%2Feprint%2F10059302%2F&rft.rights=open