One question that I haven't seen answered yet is what happens if the receiving antenna is not stationary. It seems to me that if it is moving at the time that the test signal was sent out there is no guarantee that the signals will sum together properly for the receiver now that is in a different location. Most devices that are wireless are wireless because they spend most of the time moving around.
But perhaps this system of analyzing the test signals and figuring out how to create the waveforms that will sum up for the receiver happens so fast that it is not a problem to recalibrate constantly to take in account cell phones in moving cars, etc.
But perhaps this system of analyzing the test signals and figuring out how to create the waveforms that will sum up for the receiver happens so fast that it is not a problem to recalibrate constantly to take in account cell phones in moving cars, etc.