MWML-OOC multimedia optical CDMA using SOC
MWML-OOC multimedia optical CDMA using SOC
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发表时间：
2008-01
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通讯作者：
T. Tsukahara;I. Sasase
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作者：
T. Tsukahara;I. Sasase
在MWML（multiweight-multilength）- OOC（optical orthogonal code）光码分多址（CDMA）中，通过根据用户需求改变码长和权数，可以实现传输速率和服务质量的差异化。然而，在传统的MWML-OOC光CDMA中没有进行MAI（多址干扰）的减轻。因此，由于多址干扰的影响，要求高QoS的用户不能获得小于或等于10-12的误比特率（BER）性能。此外，一般的纠错码需要增加冗余比特或增加权重的数量，其中冗余比特导致传输速率的降低，而权重数量的增加导致码数量的减少。在本文中，我们采用SOC（超正交码），可以纠正错误，而不增加冗余比特，以及重量的数量增加的MWML-OOC光CDMA，以减轻多址干扰。由于我们的方案可以减少光脉冲的数量，所提出的方案可以减轻多址干扰的影响相比，传统的方案。我们表明，所提出的方案可以提高BER性能相比，传统的计划。
In the MWML (multiweight-multilength) - OOC (optical orthogonal code) optical code division multiple access (CDMA), the differentiation of the transmission rate and QoS (quality of service) can be realized by changing the code-length and number of weights according to user requirement. However, mitigation of MAI (multi access interference) is not done in the conventional MWML-OOC optical CDMA. Therefore users who demand high QoS cannot achieve bit error rate (BER) performance less than or equal to 10-12 due to the effect of the MAI. Moreover, general error correcting codes require the addition of the redundancy bits or an increase in number of weights, where the redundancy bits cause the decrease at the transmission rate, and the increase in the number of weights causes a decrease in the number of codes. In this paper, we apply SOC (super-orthogonal code) which can correct errors without adding redundant bits as well as increasing in number of weight for MWML-OOC optical CDMA to mitigate MAI. Since our scheme can reduce the number of optical pulses, the proposed scheme can mitigate the effect of MAI compared with the conventional scheme. We show that the proposed scheme can improve the BER performance in comparison with the conventional scheme.