Effect of imperfect slot synchronization between the transmitter and the receiver on optical synchronous code-division multiple-access using pulse position modulation as data modulation (PPM/CDMA) is investigated. Optical orthogonal codes (OOC's) are employed as signature sequences, and parallel optic-fiber delay line encoders and correlators are adopted in transmitters and receivers, respectively. We derive the upper bound on the bit error probability of PPM/CDMA on condition that the receiver slot timing shifts from the transmitter timing clock. We show the bit error probability performance for some values of parameters. It is found that as the number of slots per frame increases, the timing offset should be restricted to be smaller. Further, the bit error probability performance under photocounts per second constraint is also found to be more improved than under the fixed photocounts per symbol as the number of slots in one frame increases in the small range of the timing offset.
|ジャーナル||National Conference Publication - Institution of Engineers, Australia|
|出版ステータス||Published - 1994 12月 1|
|イベント||Proceedings of the International Symposium on Information Theory & Its Applications 1994. Part 1 (of 2) - Sydney, Aust|
継続期間: 1994 11月 20 → 1994 11月 24
ASJC Scopus subject areas