hi aabid sir n burhan sir…as i mentioned earlier that i hv not locked the file…it was security error first…i hope u all arenw able to open and access the file dat i have uploaded… plz if possible try to rectify the mistakes i might hv done..and i hv already taken suggestions frm fayiqa mam..i ll try using spectrum for result analysis rather using BER analyzer…thanx all 4 ur suggestions….