An offset Z search strategy for spread spectrum systems

A novel Z search method is proposed in which the search is started at a position in the code phase uncertainty region which is offset from center. Using the unified time-domain approach developed by A. Polydoros and C. L. Weber (1984) the distribution and mean of the acquisition time have been obtained for the offset Z search strategy. Based on the mean acquisition time, the optimum offset of the Z search has been studied. The proposed method can improve mean acquisition by as much as 30% when compared with the best previous Z search strategy. The search pattern is optimized by a simple adjustment of the offset parameter