Title :
Performance of digital delay-lock loops for direct-sequence spread-spectrum signals over Rician fading channels
Author :
Wu, Tsan-Ming ; Chuang, Chung-Hua
Author_Institution :
Dept. of Electr. Eng., Chung Yuan Christian Univ., Chung-li, Taiwan
Abstract :
The performance of a non-coherent digital delay-lock loop (DDLL) for direct-sequence spread-spectrum (DS-SS) signals over Rician fading channels is analyzed. Closed-form expressions for the timing error transition probability density function (PDF) of the Chapman-Kolmogorov (C-K) equation are proposed. The transition PDF is employed to drive the analytical expressions for the steady-state timing error PDF and the mean time to lose lock (MTLL) under the Rician fading circumstances, while the numerical results are confirmed via time-domain computer simulations.
Keywords :
Rician channels; code division multiple access; delay lock loops; probability; spread spectrum communication; statistical analysis; timing; Chapman-Kolmogorov equation; DS-CDMA; DS-SS signals; Rician fading channels; digital delay-lock loops; direct-sequence spread-spectrum signals; mean time to lose lock; noncoherent digital delay-lock loop; probability density function; statistical analyses; steady-state timing error PDF; timing error transition PDF; Closed-form solution; Computer errors; Delay; Equations; Performance analysis; Probability density function; Rician channels; Signal analysis; Spread spectrum communication; Timing;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400321
