US 10,948,568 B1 · Radar detection in a wireless LAN

Abstract

Disclosed are methods and systems for a WLAN device operating on DFS channels to calibrate the PRI as well as delays between partial pulses of received radar pulses that are impaired due to channel and filtering effects. The calibrated PRI may approximate the PRI of the transmitted pulses. The calibrated delay between the partial pulses estimates the interval between two partial pulses that originally belong to the same transmitted pulse. Using the calibrated PRI and the calibrated delay between partial pulses, the WLAN device may reconstruct the original pulses from received impaired pulses even when the impaired pulses are delayed and partial pulses of the original pulses. The WLAN device may use the calibrated results to correct the shortened PW and varying PRI of the impaired pulses to restore the partial pulses to their full PW with a relatively uniform PRI, increasing the probability of detecting the radar signals.

Claims20

Dependent claims

A method of performing dynamic frequency selection (DFS) by a wireless local area network (WLAN) device, comprising:

receiving, by the WLAN device, a burst of signal pulses on a DFS channel, the burst of received signal pulses having a non-uniform pulse width (PW) and a non-uniform pulse repetition interval (PRI);
processing the burst of received signal pulses to generate calibrated PRI values;
correcting the burst of received signal pulses based on the calibrated PRI values to generate a burst of reconstructed signal pulses by lengthening the non-uniform PW of at least one of the received signal pulses;
and
detecting a radar signal based on the burst of reconstructed signal pulses.

2 more elements

A wireless local area network (WLAN) device, comprising:

a WLAN interface configured to operate the WLAN device on a dynamic frequency selection (DFS) channel;
and
a processing device configured to:
receive a burst of signal pulses on the DFS channel, the burst of received signal pulses having a non-uniform pulse width (PW) and a non-uniform pulse repetition interval (PRI);
process the burst of received signal pulses to generate calibrated PRI values;
correct the burst of received signal pulses based on the calibrated PRI values to generate a burst of reconstructed signal pulses by lengthening the non-uniform PW of at least one of the received signal pulses;
and
detect a radar signal based on the burst of reconstructed signal pulses.

5 more elements

Dependencies are inferred from the claim text.

Radar detection in a wireless LAN

Life of this patent

Radar detection in a wireless LAN

Life of this patent

Abstract

Claims20