The bad smell in your compost pile comes from anaerobic breakdown. All you have to do is turn your pile and add air. You may have to do this a number of times to improve the problem. This time of year it is impossible(difficult at best) to raise the temp. of the pile and so it just sits there and does nothing much. If you have a year or two to wait for compost, this is actually a method of composting. Always remember that if your compost has an off smell all that you need to do is add aeration(turn the pile) for aerobic breakdown!