一种基于SQPC/OCS的二维光正交码设计及性能研究

以同步二次素数码(SQPC)作为时间扩频序列，单重合序列(OCS)作为波长跳频序列，构造了一种新的二维光正交码SQPC/OCS，并对其误码性能及码字容量进行了理论分析和仿真比较。理论分析表明：在同码长、同波长数条件下，SQPC/OCS与 2D-QPC误码率相等，但SQPC/OCS波长数可以是任何数，不局限于素数，从而增加波长码片可以降低误码率；与EPC/OCS相比，SQPC/OCS误码率更低。SQPC/OCS码字容量远远高于2D-QPC和EPC/OCS码字容量。仿真结果表明：当p=7、q=13时，SQPC/OCS误码率比2D-QPC降低接近2个数量级；当p=11、q=15时，SQPC/OCS与EPC/OCS相比，当用户数为20时，误码率相差达4个数量级。

A novel two-dimensional optical orthogonal code design and performance analysis based on SQPC/OCS

A new two-dimensional optical orthogonal code named SQPC/OCS is constructed with SQPC (Synchronous Quadratic Prime Code) as time spreading sequence and OCS (One-coincidence Sequence) as wavelength hopping sequence. The performances of BER (bit error ratio) and word capacity are compared by analyzed and simulated. Theoretical analysis show that SQPC/OCS has the same BER as 2D-QPC(Quadratic Prime Code) when given the same code length and same number of wavelength, but SQPC/OCS can reduce its BER by increased the number of wavelength which is not limited to a prime number. Compared with EPC(Extend Prime Code)/OCS, SQPC/OCS gets lower BER. Moreover, the code capacity of SQPC/OCS is much more than that of 2D-QPC and EPC/OCS. The simulation show that the BER of SQPC/OCS is nearly two orders of magnitude lower and four orders of magnitude lower than that of 2D-QPC(p=7and q=13)and EPC/OCS(p=11 and q=15) while the number of synchronous users equals 20,respectively.