Alternate bit reversal search for acquisition of ultra wide-band transmissions

Rapid acquisition of ultra wide-band (UWB) signals constitutes a major challenge because of the impulse-like short pulse at the sub-nanosecond scale, which results in a very wide uncertainty region of search. Recent studies have concluded that the process of acquiring the UWB signals can be expedited by the presence of multi-path. Acquisition analysis is made here by a generalized signal flow graph approach which allows for an arbitrary search pattern and a multiple detection scenario generated by the multi-path. It was shown in E.A. Homier et al. (2003) that the bit reversal search becomes to a near optimal search technique. The alternate bit reversal search proposed in this paper per-forms very closely to the bit reversal search, which can be substituted for the parallel search method of two correlator and reduce the cost of complexity.