An embedded transmission method of PPM signaling constructed of parallel error correcting codes for optical CDMA
An embedded transmission method of PPM signaling constructed of parallel error correcting codes for optical CDMA
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光CDMA并行纠错码构造的PPM信令嵌入式传输方法
DOI：
10.1109/glocom.2001.965079
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
I. Sasase
中科院分区：
文献类型：
--
作者：
K. Kamakura;I. Sasase
提出了一种基于对称纠错码的脉冲位置调制（PPM）信号的光码分多址（CDMA）嵌入式传输方法。在该方法中，2/sup J/-元PPM信令的2/sup J/时隙被嵌入到具有2/sup J/加权位置的用户签名序列中。因此，所提出的方法增加了每个签名序列的比特数。这种传输比特数的增加使我们能够采用J纠错码，而不降低信息速率和扩展系统带宽。因此，在纠错能力内消除了多址干扰（MAI）的影响。考虑多址干扰的影响，分析了泊松光子计数过程下的误码率。数值结果表明，与传统PPM方法相比，该方法在应用纠错码时具有更好的能量效率。
We propose an embedded transmission method using pulse position modulation (PPM) signaling with symmetric error correcting codes for optical code division multiple access (CDMA). In the method, 2/sup J/ slots of 2/sup J/-ary PPM signaling are embedded in a user's signature sequence with 2/sup J/ weighted positions. Therefore, the proposed method increases the number of bits per signature sequence. This increase in the number of transmission bits allows us to adopt J error correcting codes without decreasing the information rate and expanding the system bandwidth. Consequently, the effect of multiaccess interference (MAI) is removed within the error correction capability. Considering the effect of MAI, we analyze the BER under Poisson photon counting process. Numerical results show that the proposed method has an advantage of good energy efficiency over the conventional PPM method in applying error correcting codes.