Title :
Optimal design of a noncoherent second-order delay-locked loop using the exit-time criterion
Author :
Bernhard, U.P. ; Welti, A.L.
Author_Institution :
Swiss Federal Inst. of Technol., Zurich, Switzerland
Abstract :
An approximation based on the singular perturbation method for the mean time to lose lock (MTLL) of a noncoherent second-order delay-locked loop (DLL) is derived. Such a loop is essential in direct-sequence spread-spectrum systems. The influence of loop offset due to a constant acceleration (Doppler rate) between the transmitter and receiver, as well as the optimal choice of the loop parameters due to the synchronization error, is studied
Keywords :
Doppler effect; Doppler shift; delay circuits; pseudonoise codes; singularly perturbed systems; spread spectrum communication; synchronisation; Doppler rate; direct-sequence spread-spectrum systems; exit-time criterion; loop offset; mean time to lose lock; noncoherent second-order delay-locked loop; optimal design; singular perturbation method; synchronization error; AWGN; Acceleration; Additive white noise; Communications technology; Delay effects; Delay estimation; Gaussian noise; Perturbation methods; Spread spectrum communication; Transmitters;
Conference_Titel :
Communications, 1993. ICC '93 Geneva. Technical Program, Conference Record, IEEE International Conference on
Conference_Location :
Geneva
Print_ISBN :
0-7803-0950-2
DOI :
10.1109/ICC.1993.397383
