  An adaptive joint source-channel coding (JSCC) scheme is presented for
transmitting correlated sources over discrete-memoryless two-way channels
subject to distortion constraints. The proposed JSCC scheme makes use of the
previously transmitted and received channel signals as well as the sources'
correlation to facilitate coordination between terminals. It is shown that the
adaptive scheme strictly subsumes prior lossy coding methods for two-way
simultaneous transmission and yields a new adaptive separate source-channel
coding result. Two examples are given to show the scheme's advantages.
