摘要
变重光正交码是基于不同用户带有不同的QoS(Quality of Service)需求而提出的,由于它的码重不是固定值,使得其码字的容量较之常重光正交码有所增加.给出了变重光正交码的定义及其码字容量界,介绍了构造变重光正交码的一种方法,给出一些码字的构造结果,并对码重数不同的码字进行多址干扰误码率的仿真比较和理论分析.结果表明:在相同的码重数下,码重越大的误码率越小;而当码重数不同时,在相同的码重下,码重数大的误码率小.
Variable-weight optical orthogonal codes（ VW-OOC） are put forward to provide differentiated quality of service（ QoS） for different users. Due to its non-fixed code weight,the VW-OOC is larger in capacity than constant OOC. In this paper,the definition and the bound on capacity of VW-OOC are given. The method of designing VW-OOC is presented,and the structure results of the proposed codes are given. In the end,the bit error rate（ BER） of multi-user interference for different number of code weight is compared through emulation and theoretical analysis. Results show that the BER of larger code weight is smaller while the number of code weight is the same,and the BER of larger number of code weight is smaller while the code weight is the same.
出处
《南京信息工程大学学报（自然科学版）》
CAS
2010年第6期533-537,共5页
Journal of Nanjing University of Information Science & Technology（Natural Science Edition）
基金
江苏省高校自然科学基金面上项目(BK2008437)
南京信息工程大学科研基金(20080287)
关键词
光码分多址
变重光正交码
误码率
OCDMA
variable-weight optical orthogonal codes
bit error rate
