摘要
以OCFHC(一次重合跳频码)作为时间扩频序列,OCS(单重合序列)作为波长跳频序列,构造了一种新的二维光正交码OCFHC/OCS。分析OCFHC/OCS的码字性能,得到了码字的互相关均值表达式,并对该码字的误码率进行了仿真比较。仿真结果表明,当码重和任意两个相邻"切普"波长的最小间隔一定时,增加OCFHC/OCS码的跳波长数,不仅可以降低MWOCDMA(多波长光码分多址)系统的误码率,还可以增加码字容量;与OOC(光正交码)/OCS码相比,OCFHC/OCS码的码字性能更优。
This paper constructs a novel two-dimensional（2-D）Optical Orthogonal Code（OOC）named OCFHC/OCS by using the One-Coincidence Frequency Hopping Code （OCFHC）for time spreading sequence and the One-Coincidence Sequence （OCS）for wavelength hopping sequence.Then it analyzes the codeword performances of OCFHC/OCS,obtains its average cross-correlation expression and simulates and compares its BER.Simulation results indicate that when the code weight and the minimum gap between the two adjacent chip wavelengths are fixed,increasing the number of hopping wavelength does not only reduce the BER of OCFHC/OCS system,but also increase the cardinality and compared with OOC/OCS code,the codeword performance of OCFHC/OCS is even better.
出处
《光通信研究》
北大核心
2015年第1期56-59,共4页
Study on Optical Communications
基金
浙江省科技厅创新团队项目(2010R5007)
