You can go a bit beyond on this one since I have a rough idea of how cell phones work.
What I’m interested in is how carrier aggregation works. The way I understand it is, your phone can connect to, say a 10 MHz channel from band 3, a 15 MHz channel from band 1, a 5 MHz channel from band 20, let’s say, for a combined 30 MHz.
Okay, but how does it do that with a single 4G radio? That’s 3 different frequency bands. On Wi-Fi, you can only connect to a contiguous channel with 1 radio, you can’t split channels up, let alone bands.
So how does 4G do it? And how can a single 4G radio’s tiny antennas connect to such a wide frequency range spanning 700 – 3500 MHz?
I know MIMO is also a thing, but my understanding is that for MIMO to work, the antennas have to be all the same.