802.11n: wireless APs configuration limited to 54Mbps

Hi,
I have been deploying a new wireless network using 5508 WLC (running 7.0.98) and 3502 APs.
I followed the configuration guide found on:
http://www.cisco.com/en/US/customer/products/ps6366/products_tech_note09186a0080a3443f.shtml
When I try to chek my access-points, maximum speed supported seems to be 54Mbps.
Testing the same client on a standalone AP configured for 802.11n shows 144 Mbps.
Any hint?
TIA
Ivan

Solved.
WMM was not enabled.
Thanks to:
https://supportforums.cisco.com/thread/2007749
Ivan

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