Spectral efficiency analysis of OCDMA systems  

作　　者：闫辉 邱昆 凌云 

机构地区：[1]Key Lab of Broadband Optical Fiber Communication and Communication Networks Technology,University of Electronic Science and Technology of China

出　　处：《Chinese Optics Letters》2009年第3期183-185,共3页中国光学快报（英文版）

基　　金：supported in part by the National Natural Science Foundation of China (No. 60572008);the National "863" Program of China (No. 2006AA01Z241)

摘　　要：We discuss several kinds of code schemes and analyze their spectral efficiency, code utilizing efficiency, and the maximal spectral efficiency. Error correction coding is used to increase the spectral efficiency, and it can avoid the spectral decrease with the increase of the length. The extended primer code （EPC） has the highest spectral efficiency in the unipolar code system. The bipolar code system has larger spectral efficiency than unipolar code system, but has lower code utilizing efficiency and the maximal spectral efficiency. From the numerical results, we can see that the spectral efficiency increases by 0.025 （b/s）/Hz when the bit error rate （BER） increases from 10^-9 to 10^-7.We discuss several kinds of code schemes and analyze their spectral efficiency, code utilizing efficiency, and the maximal spectral efficiency. Error correction coding is used to increase the spectral efficiency, and it can avoid the spectral decrease with the increase of the length. The extended primer code （EPC） has the highest spectral efficiency in the unipolar code system. The bipolar code system has larger spectral efficiency than unipolar code system, but has lower code utilizing efficiency and the maximal spectral efficiency. From the numerical results, we can see that the spectral efficiency increases by 0.025 （b/s）/Hz when the bit error rate （BER） increases from 10^-9 to 10^-7.

关 键 词：Bit error rate Error correction 

分 类 号：TN929.533[电子电信—通信与信息系统]