Multistage interference cancellation in multirate DS/CDMA on a mobile radio channel
Ann‐Louise Johansson, A. Svensson · 2002
A novel hybrid interference cancellation (IC) scheme is proposed for the uplink of multirate directsequence 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, joined together with a modified RAKE combiner for utilization of the diversity. The performance is evaluated via computer simulations for two multiple data rate schemes, mixed modulation and parallel channels, in a multipath environment. Both the case of known channel parameters and channel estimation using pilot symbols are considered. An analytical performance assessment is also given using a Gaussian approximation. I. INTRODUCTION It is anticipated that an important feature of future mobile communication systems will be the ability to handle other services besides speech, e.g., facsimile, Hi-Fi audio and transmission of images; services that are not readily available today. To achieve this, a multiple-acc...