Title :
Mean time to lose lock for a coherent second-order PN-code tracking loop-the singular perturbation approach
Author :
Welti, Arnold L. ; Bobrovsky, Ben-Zion
Author_Institution :
Swiss Federal Inst. of Technol., Zurich, Switzerland
fDate :
6/1/1990 12:00:00 AM
Abstract :
The singular perturbation method is used to approximate the mean time to lose lock (MTLL) for a second-order coherent pseudonoise code tracking delay-lock loop (DLL). Approximate expressions for the MTLL are given. The influence of loop offset due to the Doppler rate is studied, and optimal loop parameters (natural frequency and damping factor) which maximize the MTLL are presented. Upper bounds to the maximum allowable Doppler rates for various operating conditions are given
Keywords :
Doppler effect; perturbation techniques; spread spectrum communication; tracking; Doppler rate; damping factor; loop offset; mean time to lose lock; natural frequency; second-order coherent pseudonoise code; singular perturbation method; spread spectrum systems; tracking delay-lock loop; Additive noise; Damping; Delay effects; Delay estimation; Equations; Gaussian noise; Perturbation methods; Systems engineering and theory; Tracking loops; Upper bound;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
