一種改進型PN碼定時跟蹤環(huán)
A Novel PN Code Timing Tracking Loop for DS/CDMA Systems
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摘要: 該文提出和研究了一種用于直接序列擴頻系統(tǒng)的全數(shù)字非相干PN碼定時跟蹤環(huán)，除利用超前/滯后支路相關(guān)值的差別外，它還利用了準時支路的相關(guān)值信息。理論分析和仿真結(jié)果表明，在典型AWGN信道條件下，新方案改善了環(huán)路性能，并且算法復(fù)雜度明顯降低。
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關(guān)鍵詞:
- 擴頻通信;碼分多址;定時同步;延遲鎖相環(huán)
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. 李世鶴等譯. CDMA 擴頻通信原理. 北京: 人民郵電出版社, 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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