Digital Pulse Interval Modulation for Optical Wireless Communications

This paper presents a study of digital pulse interval modulation (DPIM) for optical wireless communications using intensity modulation with direct detection. Expressions are presented for the code characteristics, error probabilit y and power spectral density. Practical results are given for an experimental system. We have shown that DPIM has higher transmission capacity compared with digital pulse position modulation (DPPM) and is less complex to implement.