Hello, your AD IS your LDAP : the directory to populate Profiles database.
If going through sync_all_dns.bat doesn't work, you can try process_ad_changes.bat. Read the doc at
http://www-10.lotus.com/ldd/lcwiki.nsf/dx/Synchronizing_IBM_Tivoli_Directory_Server_and_Microsoft_Active_Directory_LDAP_changes_ic301.