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.
A wireless router takes your Internet connection from your modem and splits it with other computers on your network. The stronger the wireless router the better the signal you will receive. The stronger the signal the further you can be from the router and receive an Internet connection. As good as a strong signal sounds you should consider that your signal can be picked up your neighbors and passers by who may try to access your network.
Actually there is no difference between wi-fi and wireless, they're practically the same.
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.
Move closer to your wireless router so the signal will be stronger.
Wireless routers are required to have a wireless network connection. The stronger the wireless signal the further the signal will reach. Although the network can be seen by others within it's signal range, for security reasons your network cannot be accessed without a network key. Specifically a N rated wireless router has a powerful signal. G routers are much less powerful. For any router to work you need to connect a wireless receiver to the computer you want on the network.
Wired provides a stronger signal and wireless allows more freedom to change location or provides an easier connection without having to run an ethernet cable
Amplification.
you might want to move your wireless router up stiars to give better reception also moving the computer closer to the router would also help and if you have to money a N router would have a stronger signal that will carry further
No, you shouldn't. You should be able to connect to it directly.
Some routers & internet services (the best is FiOS) produces much higher wireless signals than others. However, if you're planning on staying with your current router/service, you'll need to move your PS3 closer too your router.
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.