| This Note | Artemis |
| Strong spot | pCell |
| Station | Radio Head |
Let me define a transfer element as the signal strength when one antenna element on the phone is transmitting and one ‘radio head’ is listening. I think that phones have typically one transmitter. The one point that I did pick up is that Artemis tracks the first derivative of the transfer elements. I think that they compute a transfer element several times per second. This is the complex heterodyne number that includes amplitude and phase. I think that most smart phones have just one element. Reciprocity indicates that conjugates of the same numbers serve for transmission in the opposite direction. We can now ask how the radio head transmitters maximize the signal strength at the pCell but with minimum transmitter power. The problem is getting simple enough that some coordinate free arguments might find the answer! I think I will try out this problem with two or three transfer elements.