Chip-level detection in optical code division multiple access
Chip-level detection in optical code division multiple access
复制标题
光码分多址芯片级检测
DOI：
10.1109/50.681466
复制
发表时间：
1998
影响因子：
4.7
通讯作者：
H. Shalaby
中科院分区：
文献类型：
--
作者：
H. Shalaby
提出了一种用于光码分多址（CDMA）通信系统的新型检测器。这种检测器称为芯片级接收器。开关键控（OOK）和脉冲位置调制（PPM）方案，利用该接收机，本文进行了研究。对于OOK，考虑到多用户干扰和接收机散粒噪声的影响，一个确切的误码率进行评估。在此基础上，导出了脉冲位置调制（PPM）-CDMA系统的误比特概率上界。在我们的分析中忽略了暗电流和热噪声的影响。芯片级，相关性和最佳接收机之间的性能比较。两个相关接收器和没有一个光学硬限幅器被认为是。我们的研究结果表明，显着改善的性能时，获得使用的芯片级接收机的相关性。此外，码片级接收机的性能是渐近接近最佳的。然而，该接收机的复杂度与用户数量无关，因此比最佳接收机更实用。
A new detector for optical code-division multiple-access (CDMA) communication systems is proposed. This detector is called the chip-level receiver. Both ON-OFF keying (OOK) and pulse-position modulation (PPM) schemes, that utilize this receiver, are investigated in this paper. For OOK, an exact bit error rate is evaluated taking into account the effect of both multiple-user interference and receiver shot noise. An upper bound on the bit error probability for pulse-position modulation (PPM)-CDMA system is derived under the above considerations. The effect of both dark current and thermal noises is neglected in our analysis. Performance comparisons between chip-level, correlation, and optimum receivers are also presented. Both correlation receivers with and without an optical hardlimiter are considered. Our results demonstrate that significant improvement in the performance is gained when using the chip-level receiver in place of the correlation one. Moreover the performance of the chip-level receiver is asymptotically close to the optimum one. Nevertheless, the complexity of this receiver is independent of the number of users, and therefore, much more practical than the optimum receiver.