killadark wrote:they are in the same room and my router broadcasts in 802.11n but the connection speed on laptop shows 54mbps is that right?
Looks like the laptop is connecting at 802.11g speed. Is the laptop supposed to be capable of 802.11n?
killadark wrote:the transfer speed is same for any device trying to copy files from my laptop to another laptop or a phone
my phone claims to be connected at 72mbps
which is weird cuz laptop is 54mbps
Not weird at all. When you're using an access point, your connection is to the access point, not to the other system you're talking to. Each device connects to the AP at the highest speed it can negotiate (based on the capabilities of the device, the speed of the AP, and current signal conditions). The AP handles the buffering and speed translation.
WiFi has a lot of overhead. a "54 mbps" 802.11g connection is probably going to give you only around 35 mbps (that's mega
bits per second not megabytes) under ideal conditions,
if it is the only WiFi device on the network. But in your case, you've got two devices, and the data gets transmitted twice -- once from the laptop to the AP, and again from the AP to the phone. The laptop and phone have to share the available airtime; since the phone is connecting at a slightly faster rate than the laptop it will use a smaller share, leaving about 60% of it for the laptop. So now you're down to an *effective* rate of around 21 mbps for the laptop. Dividing by 8 (since you're talking about megabytes instead of megabits), that's 2.6 MB/sec.
Bottom line: Given the connection speeds your devices are reporting, you aren't going to get more than around 2.6 MB/sec even under ideal conditions. 2 MB/sec is not at all surprising, especially if there are other devices besides the laptop and phone using the WiFi, or other nearby access points (do your neighbors have WiFi?) that could be causing interference.
Unless the laptop is 802.11n capable and can be convinced to run in that mode (or you move it to a wired connection), I don't think it is reasonable to expect any significant improvements.
Edit: If the phone supports 5 GHz WiFi you might be able to get some improvement by swapping out that D-Link for a dual-band router. This might allow the laptop and phone to operate at different frequencies so that they wouldn't need to share any more.