  This paper investigates the joint source-channel coding problem of sending
two correlated memoryless sources with common part over a memoryless multiple
access channel (MAC). An inner bound and two outer bounds on the achievable
distortion region are derived. In particular, they respectively recover the
existing bounds for several special cases, such as communication without common
part, lossless communication, and noiseless communication. When specialized to
quadratic Gaussian communication case, transmitting Gaussian sources with
Gaussian common part over Gaussian MAC, the inner bound and outer bound are
used to generate two new bounds. Numerical result shows that common part
improves the distortion of such distributed source-channel coding problem.
