diffraction
When a wireless signal encounters an obstruction, such as a wall, it can split into secondary waves that scatter in different directions. This phenomenon, known as diffraction, allows the signal to diffract around obstacles and reach areas that would otherwise be blocked. However, this can also lead to signal degradation and interference, impacting the overall signal quality.
It you can pick up Internet signal without hooking an ethernet cord into your computer. You can get the wireless signal in the wireless routers range.
You could attach an external directional antenna. Google for 'wireless antenna'.
No, With most wireless cameras; they rely on a wireless routers signal to work.
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A wireless repeater is simply a device that receives wireless signals and repeats the signal to extend the distance the wireless signal can travel. The end result is that devices can be used further away from the wireless router.
According to Life123.com, "If you're experiencing wireless signal issues, you can always add a wireless signal amplifier. An amplifier connects to your wireless router and boosts the signal output, typically by connecting to where your antenna connects. Wireless signal amplifiers also boost the receiving capabilities of your wireless router, ultimately increasing your network speed and ensuring that you never lose signal." You can buy them here (see related links).
If you do not see signal from your router, it means that the signal is not strong enough an you need to get a wireless extender or a better router.
This might help. http://www.askaboutmoney.com/showthread.php?t=112187
This a location that "broadcasts" wireless signal. Some fast food restaurants for example offer free "wifi", which is wireless signal for customers to use while they dine at the restaurant.
It has an access point which transmit signal to the client and receive.
Line-of-sight (LOS) is a condition where a signal travels over the air directly from a wireless transmitter to a wireless receiver without passing an obstruction. LOS is an ideal condition for a wireless transmission because the propagation challenge only comes from weather or atmospheric parameters and the characteristic of its operating frequency. In LOS environment, signal can reach longer distance with better signal strength and higher throughput. Conversely, non-line-of-sight (NLOS) is a condition where a signal from a wireless transmitter passes several obstructions before arriving at a wireless receiver. The signal may be reflected, refracted, diffracted, absorbed or scattered. These create multiple signals that will arrive at a receiver at different times, from different paths, and with different strength. Consequently, wireless systems developed for NLOS environment have to incorporate a number of techniques to overcome this problem and that make the systems more complex than those for LOS. But NLOS capable systems simplify network planning and site acquisition.