Rate-splitting multiple access for discrete memoryless channels

It is shown that the encoding/decoding problem for any asynchronous -user discrete memoryless multiple-access channel can be reduced to corresponding problems for at most 2 1 single-user discrete memoryless channels. This result, which extends a similar result for Gaussian channels, reduces the seemingly hard task of finding good multiple-access codes to the much better understood task of finding good codes for single-user channels. As a by-product, some interesting properties of the capacity region of -user asynchronous discrete memoryless channels are derived.