As a rule IEEE requires to submit the source file of the article. If the article is written using LaTEX, the source file should be converted to .DVI format and the graphics should be in vector format, e.g. .eps format.
To convert pdf graphics to eps format:
use pdftops
for p in $PDF; do
pdftops -f 1 -l 1 -eps "$p"
done
To convert tex file to DVI, use latex
$(basename).dvi: $(TEXT) $(FIGURES) *.bib
latex $(basename).tex #first dvi
bibtex $(basename).aux #add biblo files
latex $(basename).tex # generate teh dvi
latex $(basename).tex #not sure if necessary
dvipdfm $(basename).dvi # generate pdf
The put every files in one directory and zip it and upload ;)