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A CDMA unslotted ALOHA system using MMSE multi-user detection is proposed. In CDMA unslotted ALOHA system, a user station can transmit a packet asynchronously, and so the number of simultaneously transmitted packets fluctuates moment by moment. This fluctuation affects the performance of the MMSE multi-user detection. At first, we employ the Wiener filter detector assuming perfect information as an upper bound of the performance of the proposed system. Then, we apply an adaptive filter to CDMAdoi:10.1109/pimrc.2000.881480 dblp:conf/pimrc/OkadaGBO00 fatcat:evzwcesxx5czdba7tbpfam2dte