False alarm reduction with search windowing and peak suppression

摘要

The present embodiments are directed to systems and methods for detecting random access channel requests, while excluding false random access signals using search windowing and distance-based peak suppression techniques. The present embodiments additionally include further techniques for suppression of fake random access signals, including amplitude thresholds and preamble-based signal exclusion. Beneficially, the present embodiments significantly reduce the false alarm rate, while maintaining a low hardware complexity requirements. In some embodiments, worst-case false alarm rates can be reduced from as much as 20% down to nearly 0.1%.

主权项

1. A method for detecting physical random access channel signals with high accuracy and low false alarm rate comprising:
applying a windowing filter to identify peaks that fall outside of a predetermined window of timing offset, the timing offset being referenced to a zero-offset point of a random access signature slot; identifying a primary peak for each signature slot in which peaks appear within the predetermined window; determining whether a first primary peak has a common source with a second primary peak; and suppressing at least one of the first primary peak and the second primary peak in response to a determination that the first primary peak and the second primary peak have a common source.