Search Results

So I don't know how he can say that the characteristics repeat or maybe I'am missing something. You're missing that he is talking about the 'characteristics' of the standing wave, and not the instan …

They don't so much use a multiplexer, as the entire radio access system is designed to be a multiplexer. The ability to serve multiple users at the same time is baked-in to the specification of the ai …

The Doppler effect and the rate at which the channel changes are related phenomena, but come from different effects. Doppler If the receiver is moving towards or away from the transmitter at a speed …

How does a Hardware Engineer understands this? Please help. You don't, it's all software* from there. The whole point of this layering is to hide information about what's in the other layers. The …

A receiver only needs to receive more energy than the background noise around it to be confident about whether a 1 or 0 was transmitted. A typical signal threshold for mobiles is around -100 dBm, abou …

It depends what you mean by interference. If you mean data passing through router A 'appears' on router B's clients, then no, this doesn't happen. Each router <-> client link is encoded to label it s …

The transmission medium is the transmission medium, whether it's coaxial cable, free space, or whatever. You'll choose a carrier signal and a modulation method to suit the medium, and the requirements …

It all depends on your frequency standard. 3Hz in 1.2GHz is not possible for cheap 10MHz standards, TCXOs even, but with a decent DOCXO or rubidium standard, it will be straightforward. The trick is n …

"The transmitter adapts its power to maintain constant SIR at the receiver." When only one transmitter is involved, that might seem like a pointless thing to do. When multiple different transmit …

It's not hard to do what you suggest, it is to all intents and purposes impossible. To make a device that sat between a base-station of one standard and a mobile of another, you would have to build a …

The resistance between two points on the earth can be very low, sufficiently low to make a telegraph work. Consider the signal wire, it may have a cross section of only 1 mm2. Consider the ground betw …

In the limit of no multipath, your CP only needs to deal with the 'end effects' (bandwidth) of your channel. In practice, having a CP longer than that eases the synchronisation accuracy that you need …

LEDs can certainly be run at any light output level, and that level controlled very quickly to modulate it. However, the problem, like with any analogue system, is gain, noise and linearity. Optical s …