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Performance of digital delay-lock loops for direct-sequence spread-spectrum signals over Nakagami-m fading channels

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2 Author(s)
Tsan-Ming Wu ; Dept. of Electr. Eng., Chung Yuan Christian Univ., Chung-li, Taiwan ; Chung-Hua Chuang

In this paper, the performance of a noncoherent all-digital delay-lock loop (all-DDLL) for direct-sequence spread-spectrum signals over Nakagami-m. fading channels is analyzed. A closed-form expression for the timing error transition probability density function (PDF) of the Chapman-Kolmogorov (C-K) equation is evaluated. The transition PDF is employed to derive the analytical expression for the steady-state timing error PDF and the mean time to lose lock (MTLL) under the Nakagami-m fading environments, while the numerical results are confirmed by time-domain computer simulations.

Published in:

Communications, 2005. ICC 2005. 2005 IEEE International Conference on  (Volume:1 )

Date of Conference:

16-20 May 2005