ocdma

• Their system constructures and bit error rates are analysised we can point out that 2 - d and 3 - d ocdma system will become an important developing direction
  指出多维ocdma系统是今后的一个重要发展方向。第三章首先对双极性序列的性质进行讨论和研究。
• The paper contains nine chapters , the main contents can be outlined as follows . 1 summary of the development and recent success in the optical communication and optical cdma
  全文共分九章，主要内容如下： 1 、对光通信及ocdma的发展历史及现状进行了综述。
• The simulation results show that the capacity of the two dimensions ocdma system of 2d - ooc wavelength and time is better than that of the one dimension system
  Ocdma系统是一个容量受限的系统,当系统的同时用户数较多时,系统的性能主要由用户间的多址干扰决定。
• Aiming at this issue , on the base of an in - depth study on existing mac protocols , this thesis exploringly researched on mac protocols in w - ocdma access network
  本论文针对上述问题,在深入分析了现有的mac协议的基础上,对w - ocdma接入网的mac协议作了探索性研究。
• The structure and property of optical encoder and decoder impact the performance of ocdma system directly and judging whether the system could work practically
  光编解码器的结构和特性直接影响着ocdma系统的总体性能,决定着ocdma系统能否实际应用于全光通信网络中。
• But ocdma system uses optical signal processing and fiber transmission , the design method of spread spectrum codes and the technique to implement will be distinct from radio cdma
  但ocdma系统采用了光信号处理和光纤传输，因而在扩频码的设计和实现方法等方面都具有特殊性。
• Compared with other encoders / decoders for ocdma system , the fbgs based encoder / decoder is addressable and low cost , as well as it can be designed and integrated conveniently
  相对于其它ocdma系统编解码器而言， fbg编解码器具有可编址、设计方便、可集成化和价格低廉等优点。
• On the basis of recent researches on the ladder encoder / decoder based on fbgs , the possibility of this equipment used to ds , fe , fh and ds / fh versions of ocdma system is discussed
  在有关串联结构fbg编解码器研究的基础上，分析了它在ds 、 fe 、 fh以及ds fh等ocdma系统中运用的可能性。
• Further more , the double optical hard - limiters and balance receiver with fbgs based encoder / decoder is introduced into ocdmia system to reduce the ber of system
  此外，为了进一步降低各类ocdma系统的ber ，我们还探讨了在系统中引入双光硬限幅器和平衡补偿接收fbg编解码器的可能性和可行性。
• Considering the bit - rate up to 622mbps , it is perfect to implement the w - ocdma in high speed communication system . it lays the foundation to study ocdma communication system further
  成功实现了622mbps无线光cdma通信的系统实验,在国内还未见相关报道,实验结果表明该系统具有良好的性能。