Intel Centrino Wireless N 2230 conectivity issue!

Hello,

I have a brand new notebook Lenovo ThinkPad Edge E330 with Centrino wireless N 2230 card.

The issue is that my laptop doesen't connect to my wi-fi router at more than 54 Mbps.The router is from my ISP ,  Huawei HG 655b.

I use WPA2-PSK ,WMM activated, 20/40 Mhz  band,also i have another 2 laptops from Toshiba, they both connect to the router at minimum 150 Mbps or 270 Mbps.

So far i've updated to the latest drivers, QOS enable/disable  nothing seems to work.

Any ideea what should i try? it's really frustating to have a brand new laptop and not being able to fully enjoy it.

Thank you.