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IEEE/ICACT20220102 Slide.05        [Big Slide]	Oral Presentation
	This slide shows Proposed PPM system. The difference between the conventional and proposed systems is the way to change the pulse position. In the conventional system, a spreading sequence with the same length as the slot length is used, and is assigned to a pulse position according to bit data. On the other hand, in the proposed system, a spreading sequence with the same length as the symbol length is used, and the pulse position is changed by cyclic shifting This means that the symbol does not have slots which are unassigned to a spreading sequence. In the proposed PPM system, the unlit state becomes shorter and the illumination degradation is improved. Moreover, it is expected that the proposed system improves the bit-error rate (BER) performance by increasing sequence length.

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