Direct-detection optical synchronous CDMA systems with channel interference canceller using time division reference signal

Tomoko K. MATSUSHIMA, Shoichiro Yamasaki, Ayari Kamikata +4 more

Yoshinobu Gamachi, Tomoaki Otsuki Ohtsuki, Hideyuki Uehara +1 more

Jianhua Ji, Zhengfeng Xiao, Zhao Luo +2 more

Maw-Yang Liu, Hen‐Wai Tsao

Interference cancellation using a reference correlator for synchronous optical CDMA systems is investigated. We employ a padded modified prime sequence to achieve a “unique” cross-correlation value of “1” among all signature sequences. This scheme requires only one reference correlator to effectively suppress the interfering signals. © 2000 John Wiley & Sons, Inc. Microwave Opt Technol Lett 25: 390–392, 2000.

Hossam M. H. Shalaby

The performance of optical code-division multiple-access (CDMA) communication systems utilizing number-state light field is evaluated. Lossy direct detection optical channels are assumed. Both on-off keying (OOK) and pulse-position modulation (PPM) schemes are investigated. For OOK, the exact bit error rate is evaluated taking into account the effect of both multiple-user interference and transmission loss. Upper and lower bounds on the bit error probability for PPM-CDMA systems are derived under the above considerations. The effect of both background and thermal noise is neglected in the analysis. A comparison between the performance of the number- and coherent-state OOK/PPM-CDMA networks is also presented. The results demonstrate that the number-state system requires less than half the energy consumed by the coherent-state one in order to attain the same performance.>

Lei Xu, Camille-Sophie Brès, Varghese Baby +3 more