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In this paper, we develop a new class of medium access control protocol, which allows each user to transmit at different data rates chosen randomly from an appropriately determined set of rates. By using successive interference cancellation, multiple packets can be received simultaneously. In slotted Aloha type Gaussian networks, we show that the achievable total throughput of the proposed protocol is at least a constant fraction of the mac sum rate when the number of transmission rates at eachdoi:10.1109/isit.2009.5205457 dblp:conf/isit/CuiH09 fatcat:etmvgi4qb5g67ah6rtadcozsnu