Non-line-of-sight detection
AssigneeApple Inc.
InventorsIoannis Pefkianakis, Weiping Dou, David B. Cheung, Ye Sun, Faraz Faheem
Life of this patent
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Abstract
A wireless device can perform non-line-of-sight detection. The wireless device may establish a wireless link with another wireless device using a wireless channel. The wireless device may perform one or more channel measurements for the wireless channel. The wireless device may determine whether a line-of-sight path is available for the wireless channel based at least in part on the one or more channel measurements. The wireless device may determine whether to trigger beamforming selection, antenna selection, and/or any other link maintenance operations based at least in part on the determined line-of-sight availability.
Claims20
An apparatus, comprising a processor configured to cause a wireless device to:
- perform channel measurements for a wireless channel;
- determine whether a line-of-sight path is available for the wireless channel based at least in part on the channel measurements for the wireless channel;
- and
- determine whether to trigger one or more of beamforming selection or antenna selection, based at least in part on whether a line-of-sight path is available for the wireless channel.
A first wireless device, comprising:
- an antenna;
- a radio communicatively coupled to the antenna;
- and
- a processing element communicatively coupled to the radio;
- wherein the first wireless device is configured to:
- establish a wireless link with a second wireless device using a wireless channel;
- perform channel measurements for the wireless channel during a first time window;
- and
- determine whether a line-of-sight path is available for the wireless channel during the first time window based at least in part on the channel measurements for the wireless channel during the first time window.
A method, comprising:
- by a wireless device:
- performing channel measurements for a wireless channel used for a wireless link, wherein the channel measurements comprise estimating a signal to noise ratio (SNR) for the wireless channel and estimating a channel impulse response (CIR) for the wireless channel;
- calculating standard deviation of the estimated SNR for the wireless channel;
- estimating a channel delay spread for the wireless channel based at least in part on the channel measurements;
- and
- determining whether a line-of-sight path is available for the wireless channel based at least in part on the standard deviation of the estimated SNR and the estimated delay spread.
Dependencies are inferred from the claim text.