Can not connect to Ad-Hoc network on ubuntu 10.10

I've created an ad-hoc network on my pc with broadcom43xx pci wireless
card.
But i can not connect this network because of RT2870STA driver.
How to solve this problem?
Also i tried wpa_supplicant, wep(i've got cipher error.) and no
password.
There is RT2800 driver that's working good in ubuntu 11.10. May this
driver solve my problem?