After every layer of food, waste, or what have you, add a nice, equal layer of fresh sawdust. Fine wood chips will also work, but sawdust is best. The decomposition of the waste mixed in with the cut wood neutralizes the smell quite well. this technique is also used in many permanent outhouses.
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By making sure that you're following proper procedure is the way to avoid smelling if you're working with homemade compost. Specifically, neither the composting pile nor the endproduct of compost is supposed to have offensive smells. A compost pile smells for two reasons. One is the use of materials that aren't compostable. The other is incorrectness of air, moisture and temperature levels.