一種新的OVSF碼動態(tài)有序分配算法
A Novel Dynamic Sequential Allocation Algorithm of OVSF Codes
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摘要: 該文通過研究W-CDMA系統(tǒng)下行鏈路OVSF碼的特性,針對傳統(tǒng)的隨機(jī)動態(tài)分配算法存 在碼阻塞的問題,提出了一種動態(tài)有序分配算法,采用先分配低速用戶,相同層從低序號碼字向高序號碼字 順序分配的原則。并對該算法的流程和系統(tǒng)實現(xiàn)給予了詳細(xì)的描述。最后通過系統(tǒng)性能的理論分析和數(shù)值仿 真,證明該算法大大降低了碼字阻塞概率,減少了系統(tǒng)開銷,對于工程應(yīng)用具有重要價值。
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關(guān)鍵詞:
- 正交可變長擴(kuò)頻; 碼阻塞; 動態(tài)有序分配
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 implemen-tation 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. -
3rd Generation Partnership Project, Technical Specification Group Radio Access Network,Spreading and Modulation (FDD) (3G TS 25.213 V.3.3.0 (2000-06)).[2]3rd Generation Partnership Project, Technical Specification Group Radio Access Network, Radio Resource Management Strategies (3G TS 25.922 V.3.2.0 (2000-06)).[3]Thit Minn, Kai-Yeung Siu. Dynamic assignment of orthogonal variable-spreading-factor codes in W-CDMA[J].IEEE J. on Selected Areas in Communications.2000, 18(8):1429-1440[4]Dahlma1n E, Gudmundson B, Nilsson M, Skold A. UMTS/IMT-2000 based on wideband CDMA.IEEE Communications Magazine, 1998, 36(9): 70-80. -
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