Multistage multiuser detection for FHMA

A multistage multiuser detector (MMD) is presented for frequency hopping/code division multiple access (FH/CDMA.) The MMD reduces the bit error rate over the conventional detector by exploiting prior knowledge of the addresses and energies of the users. This detector is a conservative multiuser detector which is robust to unknown users and is only linear in complexity in the number of users. The performance analysis of the synchronous MMD (SMMD) includes both theoretical and simulation bit error rates for the noiseless case and simulation results in the presence of noise. The MMD is then extended to the asynchronous case. This asynchronous multistage multiuser detector (AMMD) is compared via simulation to the conventional detector.