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As the white paper puts it: "DIDO communication begins with the DIDO access points exchanging brief test signals with the DIDO user devices. By analysing what happened to these test signals as they propagate through the wireless links, the DIDO data centre determines precisely what will happen when it transmits data signals from the APs to users, and how the simultaneously transmitted signals will sum together when received by each user device. Then, the DIDO data centre uses this analysis, along with the data each user is requesting (eg video from a website), to create precise waveforms for all of the APs that, when transmitted at once will sum together at each user device to create a clean, independent waveform carrying the data requested by that user.
"So, if there are 10 APs and 10 users all within range of each other, then 10 radio signals will sum together at each antenna of each user's device to produce an independent waveform for each device with only that device's data."
The practicalities of this seem significantly daunting - especially if the receivers are mobile. The white paper does not discuss in detail what limitations might be possible given current and future projections in processing power, but says: "We do not know of a theoretical limitation to how many users we can add to a DIDO system without a degradation in data rate per user.
"There certainly will be practical limitations with each era of technology evolution, but we have not yet come close to them. So far, as we've increased the number of simultaneous users in the same area to 10 (limited just by the number of hand-built radios we have) we have not seen any degradation in performance'¦Until we start to see some degradation in performance as we add more users, we will not be able to predict how far it can go."
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