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Volume 26 Issue 1
Jan.  2004
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Li Ke-xiang, Song Guo-wen. Performance Analysis of Coherent Delay-Locked Loop Based on Interpolation and Integrate/Dump Filter[J]. Journal of Electronics & Information Technology, 2004, 26(1): 27-34.
Citation: Li Ke-xiang, Song Guo-wen. Performance Analysis of Coherent Delay-Locked Loop Based on Interpolation and Integrate/Dump Filter[J]. Journal of Electronics & Information Technology, 2004, 26(1): 27-34.

Performance Analysis of Coherent Delay-Locked Loop Based on Interpolation and Integrate/Dump Filter

  • Received Date: 2002-08-09
  • Rev Recd Date: 2003-04-02
  • Publish Date: 2004-01-19
  • A Coherent Delay-Locked Loop(CDLL) is proposed based on interpolation and integrate/dump filter for PN code tracking in DS-CDMA systems. The performance of the CDLL is investigated under AWGN and multi-user environments, and closed-form expres-sions for the timing adjustment error probability, steady-state timing squared root error, probability and Mean Time to Lose Lock (MTLL) are derived by employing appropriate Markov chain models. Finally, some numerical results are presented and analysis shows that those results also perform well in single path fading environment. The delay-locked loop is applied to the development of WCDMA BTS and WCDMA MT.
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  • Goldberg S H, Iltis R A. PN code synchronization effects on narrow-band interference rejection in a direct-sequence spread-spectrum receiver. IEEE Trans. on Communications, 1988, COM-36(4):420-428.[2]Hart B W, Van Nee R D J, Prasad R. Performance degradation due to code tracking errors in spread-spectrum code-division multiple-access systems. IEEE J. on SAC, 1996, 14(8): 1669-1779.[3]Gardner F M. Interpolation in digital modems-Part I: Fundamentals. IEEE Trans. on Communications, 1993, COM-41(3): 501-507.[4]Erup L, Gardner F M, Harris R A. Interpolation in digital modems - Part Ⅱ: Implementation and performance. IEEE Trans. on Communications, 1993, COM-41(6): 998-1008.[5]Bucket K, Moeneclaey M. The effect of interpolation on BER performance of narrowband BPSK and (O)QPSK on Rician-fading channels. IEEE Trans. on Communications, 1994, COM-42(11):2929-2033.[6]Caffery J Jr., Stuber G L. Effects of multiple-access interference on the noncoherent delay lock loop. IEEE Trans. on Communications, 2000, 48(12): 2109-2119.[7]Wern-Ho Sheen, Stuber G L. Effects of multipath fading on delay-locked loops of spread spectrum systems[J].IEEE Trans. on Communications.1994, 42(2/3/4):1947-1956[8]Gaudenzi R D, Luise M, Viola R. A digital chip timing recovery loop for band-limited directsequence spread-spectrum signals. IEEE Trans. on Communications, 1993, COM-41(11): 1760-1769.[9]A.J.维特比著,李世鹤等译.CDMA扩频通信原理.北京:人民邮电出版社,1997:21-36.
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