So we could really break up what we've talked about here into three different segments. The first one is multiple access which looks at different ways that you can allow multiple people to share at the same network medium without causing interference to one another, or ways in which we can share the air. And we've seen how sharing is very hard because these were not easy to come up with, especially at the time. First one's FDMA, Frequency Division Multiple Access, where we have division onto different frequency bands. And that was used between 0G and 1G. The second one was TDMA, which adds onto FDMA and also divides users In different times, and it adds capacity improvements over FDMA. That came about with the emergence of digital cellular and was a popular 2G standard. Then we have CDMA, Code Division Multiple Access, where every link gets a different code. And that's how they communicate and know what's meant for them. >> And we didn't talk about this, but OFDMA or Orthogonal Frequency Division Multiple Access is the standard that's being rolled out for 4G LTE. And in a future course, maybe we'll come back and talk about the new and exciting ingredients there. >> And then we talked about interference management, especially under a CDMA system. When users are all talking at the same times and on the same frequency bands, how do we manage the interference that's caused there. So we talked about one first which is the transit power control. That simple one step algorithm where we're adjusting for signal power rather than signal quality. Distributive power control was the meat of this lecture and what we looked at. And we saw how distributive power control overcomes the near far problem and that's caused with interference. And then some major themes. The first one is the idea of negative feedback especially in distributive power control. We'll see negative feedback come up many times but the idea is that you want to keep something in a constant level like the SAR here, so you will adjust and decrease and increase your transit power accordingly, to make that happen. We also look at negative externality, which what negative feedback helps transmitters to internalize the negative effect of the impose on the rest of the network. And we look at distributed computation, which is another huge steam here, how DVC is completely distributed In the sense of each device can make its own decisions without having to know what the other devices are doing. And each device also performs it's own computation rather than having to do that computation at some centralize server. All right, so I hope you enjoyed the lecture. I'll see you in the next one, which will be on WiFi.