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These newfangled beamforming systems can alter the direction of transmission to optimize signal quality for your phone. How can they do that if the system canno
by eurasiantiger 5y ago
These newfangled beamforming systems can alter the direction of transmission to optimize signal quality for your phone. How can they do that if the system cannot locate a handset with great accuracy?
- iamstupidsimple 5y agoBeams don't have to be that accurate to boost signal quality. This is also speculation on my part but I'd suspect they're targeting specific clusters of devices in an area and using multiplexing than having dozens of radios on one tower.
- PeterisP 5y agoI 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 agoFrom 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.”