False alarm reduction with search windowing and peak suppression
AssigneeHong Kong Applied Science and Technology Research Institute Company Limited
InventorsHonglei Zhang, Yuxian Zhang, Jun Xu, Wing Chau Chan
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Abstract
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%.
Claims24
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.
An apparatus for detecting physical random access channel signals with high accuracy and low false alarm rate comprising:
- a windowing module to apply 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;
- a signature detection module to identify a primary peak for each signature slot in which peaks appear within the predetermined window;
- and
- a peak suppression module coupled to the signature detection module and to:
- determine whether a first primary peak has a common source with a second primary peak;
- and
- suppress 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.
A tangible non-transitory medium comprising instructions that, when executed by a processing device, cause the processing device to perform operations 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.
Dependencies are inferred from the claim text.