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 multipath. It was shown in [1] that the bit reversal search becomes to a near optimal search technique. The alternate bit reversal search proposed in this paper performs 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.