一种改进型PN码定时跟踪环
A Novel PN Code Timing Tracking Loop for DS/CDMA Systems
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摘要: 该文提出和研究了一种用于直接序列扩频系统的全数字非相干PN码定时跟踪环，除利用超前/滞后支路相关值的差别外，它还利用了准时支路的相关值信息。理论分析和仿真结果表明，在典型AWGN信道条件下，新方案改善了环路性能，并且算法复杂度明显降低。
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关键词:
- 扩频通信;码分多址;定时同步;延迟锁相环
Abstract: In this paper a novel non-coherent all-digital timing tracking scheme is described and analyzed for chip timing synchronization in direct sequence spread spectrum systems. Results of the theoretical analysis and computer simulations show that the scheme improves tracking performance as compared with the traditional delay-locked loop (DLL) in an AWGN environment. Also, the new scheme enhances the hardware simplification with respect to other traditional non-coherent schemes. -
Gaudenzi R D, Luise M. Decision-directed coherent delay-locktracking loop for DS-spread-spectrum signals. IEEE Trans. onCommunications, 1991,30(5): 758-765.[2]Gaudenzi R D, Luise M. A digital chip timing recovery loop forband-limited direct sequence spread spectrum signals. IEEETrans. on Communications, 1993,41(11): 1760-1 769.[3]Viterbi A J著. 李世鹤等译. CDMA 扩频通信原理. 北京: 人民邮电出版社, 1997: 58-66.[4]Yost R A, Boyd R W. A modified PN code tracking loop: Itsperformance analysis and comparative evaluation. IEEE Trans. onCommunica~ions1, 982, COM-30(5): 1027- 1036.[5]Su Szu-Lin, Yen Nan-Yang. Performance of digital code trackingloops for direct sequence spread spectrum signals in mobile radiochannels[J].IEEE Trans. on Communications.1997, 45(5):596-604[6]Scheim J, Bobrovsky B 2. Computationally efficientdiscriminators for code-tracking loops. IEEE Trans. on VehicularTechnology, 2003,52(3): 727-732. -
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