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Peter C. Massey and Daniel J. Costello, Jr. Dept. of Ele . Engr. University of Notre Dame Notre Dame, IN 46556 Phone: 219-631-5483, Fax: 219-631-4393 E-mail: pmassey nd.edu ostello.2 nd.edu Abstra t: Several new lasses of asymmetri turbo odes are introdu ed whi h o er improved performan e ompared to the original turbo ode over the entire range of signal-to-noise ratios. The new turbo odes make use of soalled Big Numerator-A ummulator onstituent odes. A new on ept of rate-asymmetry is introdu ed and used to reate a lass of doublyasymmetri turbo odes.