Adaptive Multiuser Decision Feedback Detection using Erasure Algorithm based Partial Parallel Interference Cancellation

In this paper, adaptive decision feedback detector (ADFD) based on parallel interference cancellation (PIC) approach is proposed for code division multiple access (CDMA) wireless systems, which not only suppresses the intra-cell interference but also cancels the inter-cell interference. We incorporate the erasure algorithm based soft-slicer (E-slicer) to control the error propagation effect in the proposed decision feedback technique, which supersedes the hard decisions based approach. The computer simulation results are presented to show the substantial improvement in the bit error rate (BER) performance of the presented minimum mean square error (MMSE) ADFD-PIC technique over the conventional techniques, under the frequency-selective smoothly time-varying fading channels. Index Terms – Decision feedback detection, multiuser detection and interference cancellation (IC).