论文部分内容阅读
利用不同的序列作为波长跳频序列和时间扩频序列可以构造出不同的二维光正交码在众多文献中已有所报道.在经过正交拉丁方(OLS)与跳频序列的相关性研究之后.做了以下主要工作:首先,将正交拉丁方(OLS)序列作为波长跳频序列,结合一维时间扩频序列(OOC),构造了一种OLS/OOC二维光正交码.然后,本文对构造的OLS/OOC进行了多种性能仿真和分析.相对于PC/OOC、OCFHC/OOC等二维光正交码而言,OLS/OOC的波长数并不局限于素数,更能充分利用MWOCDMA系统中的有效波长数.仿真和分析表明:码字具有很好的相关性能,码字容量直逼理论极限,为一种渐近最优二维光正交码.
Different two-dimensional optical orthogonal codes can be constructed by using different sequences as the wavelength hopping sequence and the time spreading sequence. It has been reported in many literatures. After the orthogonal lasing square (OLS) correlation with the frequency hopping sequence After the research, the main work is as follows: Firstly, an orthogonal OLS (orthogonal OLS) sequence is used as the wavelength hopping sequence and a one-dimensional time-spreading sequence (OOC) .Then, we do a lot of performance simulation and analysis on OLS / OOC.Compared with PCA, OCFHC / OOC and other 2D Orthogonal Codes, OLS / OOC wavelength is not limited to prime numbers, And can make full use of the effective wavelength in MWOCDMA system.The simulation and analysis show that the codeword has good correlation performance and the codeword capacity is almost equal to the theoretical limit and is an asymptotically optimal two-dimensional optical orthogonal code.