A new universal coding/decoding scheme for random access with collision detection is given in case of two senders. The result is used to give achievable joint source-channel coding error exponents for multiple access channel and independent sources. In a modified model admitting zero rate communication between the senders, an improved exponent is derived, of form similar to Csiszár's joint source-channel exponent for the one-sender case.
Ebrahim MolavianJaziJ. Nicholas Laneman
Sadaf SalehkalaibarMohammad Reza Aref
Óscar FresnedoJosé P. González-ComaLuis CastedoJavier Garcia‐Frias