Information theory, communication theory, bandwidth efficient combined coding modulation techniques, spread spectrum systems and mutual user interference cancellation for CDMA, turbo codes, binary and non-binary LDPC codes, iterative decoding

• 2008, Best Joint Paper Award of the IEEE Information Theory and IEEE Communication Theory Societies
• 2000, Best Paper Award for .A simple tight bound on error probability of block codes with application to turbo codes,. Jet Propulsion Laboratory, California Institute of Technology
• 1998, Hugh Fosque Best Paper Award for .Code Performance as a function of block size.. Jet Propulsion Laboratory, California Institute of Technology
• 1988, Best Paper Award of the IEEE Transactions on Vehicular Technology