【摘要】 提出了一种引入光硬件限幅器的光 PPM- CDMA(脉冲位置调制 -码分多址 )通信系统方案 ,即在接收机相关器之前引入一个光硬件限幅器 ,以便更好地减少多用户干扰。在系统中存在多用户干扰及接收机散粒噪声的情况下 ,推导出该系统误码率上限 ,并对该系统特性与无光硬件限幅器的光 PPM- CDMA通信系统特性作了比较。分析结果表明 ,引入光硬件限幅器系统的误码特性得到明显的改善。更多还原

【Abstract】 An optical PPM CDMA communication system with optical hard limiter placed before correlator of receiver is proposed in order to reduce multi user interference. The performance of the system is evaluated when considering the effects of both multi user interference and photo detector shot noise.An upper bound on the bit error rate is derived. The comparison of the performance of the above receiver with that of optical PPM CDMA system without optical hard limiter is given. Simulation results show that the performance of the system with optical hard limiter is superior to the conventional one.更多还原