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Indoor diffuse wireless optical intensity channels are bandwidth constrained channels in which all transmitted signals must be non-negative. In order to control the impact of inter-symbol interference (ISI) on this channel, pulse shaping is required. This paper derives the minimum bandwidth, ISIfree Nyquist pulse which satisfies the amplitude non-negativity constraint. The minimum bandwidth required is twice that of conventional electrical channels. Further, it is shown that there are nodoi:10.1109/glocom.2005.1577875 dblp:conf/globecom/Hranilovic05 fatcat:hondy5mxqfcaxjcdkrgxevbnfy