2 ms·

I have no idea about what information the (5G?) beamforming protocols use; perhaps they have figured out a way for some "angle discovery" as part of the protoco

I have no idea about what information the (5G?) beamforming protocols use; perhaps they have figured out a way for some "angle discovery" as part of the protocol handshake or perhaps they just require the device send GPS data for that adjustment (and in the absence of that data would just skip beamforming, getting worse rates); but the distance information for the 4G/LTE timing system would be an inherent part of the protocol even if the device does not have GPS enabled and is based on literally measuring the round-trip timing.

eurasiantiger 5y ago
From Wikipedia/MIMO: ”To correctly form a beam, the transmitter needs to understand the characteristics of the channel. This process is called channel sounding or channel estimation. A known signal is sent to the mobile device that enables it to build a picture of the channel environment. The mobile device sends back the channel characteristics to the transmitter. The transmitter can then apply the correct phase and amplitude adjustments to form a beam directed at the mobile device. This is called a closed-loop MIMO system.”