added support for 1.5/10/20 MHz. 1.5MHz primary synch is still broken (128-bit alignment issue with 128-point DFTs). 1/2 UEs connection seems to work ok for 10/20 MHz.

git-svn-id: http://svn.eurecom.fr/openair4G/trunk@4023 818b1a75-f10b-46b9-bf7c-635c3b92a50f