Two-dimensional code acquisition in fixed multipath channels

Analytical performance results of a two-dimensional code acquisition process are obtained for a multipath fixed channel where L equal-amplitude delay- or angle-contiguous components are present. The performance measure used here is the worst-case mean acquisition time. Two basic search strategies are used in the acquisition process, namely an angle-delay and delay-angle search approaches. Optimal threshold setting is employed while interference is modeled as temporarily and spatially white. It is shown that in general the search strategy could have a significant impact on the performance. In order to reduce the average time to acquisition the serial search should proceed in a fashion that consecutive synchro cells appear as uniformly spread as possible within the uncertainty region