US 2022/0070622 A1 · PEAK TO SIGMA RATIO MEASUREMENT WITH ACTIVE GEO-LOCATION FOR WIRELESS LOCAL AREA NETWORK DEVICES

Abstract

A method and wireless devices (WDs) for geo-location of wireless devices are disclosed. According to one aspect, a method in a first WD includes: transmitting a sequence of ranging signals and receiving a plurality of ranging response signals from a second WD, the ranging response signals being responsive to the ranging signals. For each of the plurality of ranging response signals, a received sequence of bits is determined. A correlation between the received sequence of bits and an expected sequence of bits is determined. The method also includes determining a subset of the plurality of received sequences of bits deemed not to arise from noise, and determining the subset being based at least in part on the correlations. The method also includes determining a distance between the first WD and the second WD based at least in part on a plurality of received sequences in the subset.

Claims20

Dependent claims

A method in a first wireless device (WD), the method comprising:

transmitting a sequence of ranging signals in a burst of N transmissions;
and
receiving a plurality of ranging response signals from a second WD, the ranging response signals being responsive to the ranging signals;
and
for each of the plurality of ranging response signals:
determining a received sequence of bits;
and
determining a correlation between the received sequence of bits and an expected sequence of bits;
and
for each of a plurality of transmitted ranging signal sequences, determining a first ratio of a peak value of a sum of the correlations to a standard deviation of the sum of correlations to obtain a peak to standard deviation ratio (PSR);
and
determining a second ratio of a sum of PSRs having standard deviations in a first range of standard deviations to a sum of PSRs having standard deviations in a second range of standard deviations;
and
determining a distance between the first WD and the second WD based at least in part on the second ratio.

11 more elements

A first wireless device (WD), comprising:

a radio interface configured to:
transmit a plurality of ranging signals and recording a time of transmission of each ranging signal of the plurality of ranging signals;
and
receive a plurality of ranging response signals from a second WD;
and
processing circuitry in communication with the radio interface, the processing circuitry configured to:
extract a sequence of bits from each ranging response signal of the plurality of ranging signals to obtain a plurality of received bit sequences;
correlate each received bit sequence of the plurality of received bit sequences with an expected sequence to produce a plurality of correlations;
for each of a plurality of transmitted ranging signal sequences, determining a first ratio of a peak value of a sum of the correlations to a standard deviation of the sum of correlations to obtain a peak to standard deviation ratio (PSR);
determine a second ratio of a sum of PSRs having standard deviations in a first range of standard deviations to a sum of PSRs having standard deviations in a second range of standard deviations;
and
determine a distance between the first WD and the second WD based at least in part on the second ratio.

9 more elements

Dependencies are inferred from the claim text.

Peak to sigma ratio measurement with active geo-location for wireless local area network devices

Life of this patent

Peak to sigma ratio measurement with active geo-location for wireless local area network devices

Life of this patent

Abstract

Claims20