On the Multiple-Access Channel with Common Rate-Limited Feedback

This work studies the multiple access channel (MAC) with rate-limited feedback. The channel output is encoded into one stream of bits, which is provided causally to the two users at the channel input. An achievable rate region for this setup is derived, based on superposition of information, block Markov coding, and coding with various degrees of side information, for the feedback link. The suggested region coincides with the Cover-Leung inner bound for large feedback rates.