A new modulation scheme using asymmetric erorr-correcting codes embedded in optical orthogonal codes for optical CDMA
A new modulation scheme using asymmetric erorr-correcting codes embedded in optical orthogonal codes for optical CDMA
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一种使用嵌入光正交码的非对称纠错码的新调制方案用于光CDMA
DOI：
10.1109/50.971675
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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
提出了一种用于光码分多址（CDMA）的嵌入式调制方案。在该方案中，非对称纠错（AEC）码中的码字被嵌入到用于识别的光正交码（OOC）中的签名序列中。我们根据每个码字中“1“的个数对AEC码的码字进行分类，然后推导出嵌入调制方案的误比特率。数值结果表明，虽然性能有错误地板，为实现地板值，嵌入调制方案需要更少的光能量每比特比传统的调制方案与相关和芯片级接收机。错误平层主要是由于多址干扰（MAI），我们进一步应用里德所罗门（RS）编码的嵌入调制方案。因此，RS编码将底值减小到可忽略的小。
An embedded-modulation scheme is proposed for optical code division multiple access (CDMA). In this scheme, codewords in an asymmetric error-correcting (AEC) code is embedded in a signature sequence in an optical orthogonal code (OOC) used for identification. We classify the codewords of the AEC code according to the number of "1"s in each codeword, and then derive the bit error rate (BER) of the embedded-modulation scheme. Numerical results show that although the performance has the error floor, for achieving the floor value, the embedded-modulation scheme requires less optical energy per bit than the traditional modulation scheme with the correlation and chip-level receivers. The error floor is primarily due to multiaccess interference (MAI), we furthermore apply Reed-Solomon (RS) coding to the embedded-modulation scheme. Consequently, RS coding reduces the floor value to be negligibly small.