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No. The transmitters calculate signals such that constructive/destructive interference will combine to form a strong, clean signal in the precise location where
by cantfindmypass 13y ago
No. The transmitters calculate signals such that constructive/destructive interference will combine to form a strong, clean signal in the precise location where the device is.
- bdcs 13y agoCorrect me if I'm wrong, but is this not beamforming?
- gallamine 13y agoPerhaps the "trick" is a large number of antennas to produce an ultafine beam pattern?
- lutusp 13y agoNo, it's not the number of antennas (although there is always more than one), the method relies on the phase (or "time delay") of the signal at each antenna.
- Dylan16807 13y agoWhy do you say no? The more antennas you have, the cleaner you can keep the beam and minimize constructive interference happening in the wrong places.
- lutusp 13y agoI say no because the system relies on multiple antennas, but beyond a few, the advantage evaporates while the workload increases. I wouldn't be surprised if the system limits itself to three well-placed antennas surrounding the target device, just to simplify the calculations. > The more antennas you have, the cleaner you can keep the beam and minimize constructive interference happening in the wrong places. Beyond three antennas surrounding a given device, this just isn't true -- more antennas don't produce a proportional increase in performance to compensate for the increased computation workload.
- foobarian 13y agoNot for one client device, but it definitely helps when handling lots of clients. The more antennas the fewer spots with unwanted constructive interference.
- lutusp 13y ago> The more antennas the fewer spots with unwanted constructive interference. Yes, true, but the entire system becomes more complex for a small improvement in performance. Also, most of the theoretical work in a scheme like this would focus on the least common denominator, which is three antennas. Interestingly, for a roughly circular array of antennas, you end up with concentric rings of high signal strength as you approach the midpoint of the array. So even the thesis that you've eliminated unused hot spots breaks down in some cases. Here's my diagram for three phase-controlled antennas (the blue dots): http://i.imgur.com/tyyVh0j.png http://i.imgur.com/tyyVh0j.png The wavelengths in this diagram are longer than for a cell system, it's just to show how this idea works. Buy adjusting the phase at each antenna, you can move the high-strength lobes around to match up with the location of a given device.
- foobarian 13y agoThe trick is getting that many antennas deployed in an urban area. They also have to be wired, and have reliable low latency connections to the datacenter.
- lutusp 13y agoThe problem is not the idea, but the word. Most people don't think of constructive phase adjustments as beamforming. It's not wrong, it's just an unfamiliar term.
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