The Capacity Region of Fading Multiple-Access Relay Channels With Common Information
In this paper, the authors derive a capacity region for Gaussian fading multiple access degraded relay channel with partial Channel State Information (CSI) at the Transmitters (CSIT) and perfect CSI at the Receiver (CSIR). The achievable rate region obtained by Kramer-Wijngaarden is a special case of their region. Relaying has been proposed as a means to increase coverage area of wireless networks. Relay nodes in cooperation with the users, act as a distributed multi antenna system. Now-a-days, there has been much research on a multiuser extension of the relay channel, e.g., Multiple-Access Relay Channel (MARC).