Home-wireless network quite slow at night ?!

After many times of changing configuration, I still coundn't understand why my Wireless becomes quite slow after the sun set,though it is just in the range of an apartment (80m2). In the day time it gets the full-speed (I have cable internet :1024/256), but at night I have to wait 1 minute to see the homepage of Google.
The most suspect reason could be : there is another guy using also a wireless network in his apartment ,cause I saw the network name in the "available network",but this network always appears in my list all day, not just only at night. So I think, maybe after work this guy comes back home and turn on his computer making interfere with my network, is that true ?
So how can i work this problem out ?
Thx in advance.

 

If his network were interfering with yours, it would most likely happen all day if you can see his SSID. There are many sources of possible interference. The most common are, 2.4ghz cordless phones, microwaves, and baby monitors. Since you live in an appartment complex, and people get home from work when the sun goes down, I would suspect one of these sources of interference is getting used.
Unfortunetly if you are not the source of the interference, there is nothing you can do to stop it. The only thing I can suggest is moving to an 802.11a network, which uses a different frequency, and would not be affected by the same sources of interference.

Good Luck,
Cwolly

 

Would it work if I change the broadcasting channel of my Wireless Access Point (also integrated Router) ?

 

You can try... I would use either 1, 6, or 11, which are the non-overlapping channels in the 2.4ghz spectrum and will cause the least amount of interference.
-Cwolly

 

Yeah, I've changed the channel to 11 and now (10 PM) the network is still in its original condition . Or maybe the guy has gone out cause today is Friday
Anyway, nothing can be concluded now, have to wait some more time