A Hybrid Interference Cancellation Scheme for Multiuser Systems in Multipath Fading Channels
Ann‐Louise Johansson, Arne Svensson · European Transactions on Telecommunications · 2000
Abstract A new hybrid interference cancellation (IC) scheme is proposed for the uplink of multirate direct‐sequence code division multiple access (DS‐CDMA) systems communicating over mobile radio channels. The hybrid IC scheme includes both non‐decision directed and decision directed IC, together with a modified RAKE combiner to utilize the diversity in a frequency‐selective channel. The performance is evaluated via computer simulations for the two multiple data rate schemes, mixed modulation and multicode, in a multipath environment. Both known channel parameters and channel estimation using pilot symbols are considered. The results show that rnulticode or a combination of multicode and mixed modulation are preferable when handling multirate system and the loss in performance compared to the single‐user bound is small.