| 一种新的OVSF码动态有序分配算法 |
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| 引用本文： | 朱春梅,吴伟陵.一种新的OVSF码动态有序分配算法[J].电子与信息学报,2004,26(1):20-26. |
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| 作者姓名： | 朱春梅 吴伟陵 |
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| 作者单位： | 北京邮电大学信息工程学院181信箱,北京,100876;北京邮电大学信息工程学院181信箱,北京,100876 |
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| 基金项目： | 国家863重大项目(No.2001AAl23016)，国家自然科学基金重大项目(No.69896243)，国家自然科学基金(No.60172051)资助课题 |
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| 摘 要： | 该文通过研究W-CDMA系统下行链路OVSF码的特性,针对传统的随机动态分配算法存 在码阻塞的问题,提出了一种动态有序分配算法,采用先分配低速用户,相同层从低序号码字向高序号码字 顺序分配的原则。并对该算法的流程和系统实现给予了详细的描述。最后通过系统性能的理论分析和数值仿 真,证明该算法大大降低了码字阻塞概率,减少了系统开销,对于工程应用具有重要价值。
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| 关 键 词： | 正交可变长扩频 码阻塞 动态有序分配 |
| 文章编号： | 1009-5896(2004)01-0020-07 |
| 收稿时间： | 2002-7-4 |
| 修稿时间： | 2002年7月4日 |
A Novel Dynamic Sequential Allocation Algorithm of OVSF Codes |
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| Zhu Chun-mei,Wu Wei-ling.A Novel Dynamic Sequential Allocation Algorithm of OVSF Codes[J].Journal of Electronics & Information Technology,2004,26(1):20-26. |
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| Authors: | Zhu Chun-mei Wu Wei-ling |
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| Institution: | Info. Eng. School; Beijing Univ. of Posts and Telecomm. 181 Box; Beijing 100876; China |
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| Abstract: | This paper analyzes the feature of W-CDMA downlink OVSF code. A novel dynamic sequential allocation algorithm is presented according to code blocking ratio in the stochastic allocation. Low level codes are allocated firstly, and codes in the same level are allocated sequentially by order from low to high. The algorithm flow and system implementation is specified. Finally, theoretical analysis and system simulation are presented. It is proved that it greatly reduces the code blocking probability and system overhead , which is valuable for engineering applications. |
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| Keywords: | Orthogonal variable spreading factor Code blocking Dynamic sequential allocation |
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