Pilot-channel aided SIC scheme for multirate WCDMA systems in multipath fading channels

Abstract

A generalized pilot-channel aided successive interference cancellation (SIC) scheme is presented to apply to multirate communications in uplink WCDMA systems over multipath Rayleigh fading channels. The scheme performs data detection in a group manner for each user, and the cancellation order is decided based on the average RAKE output strength over the grouping interval at the first stage of SIC. The grouping detection method help the users with relatively large spreading gain to perform much better at the expense of slight performance loss of the user with the lowest spreading gain. In addition to showing that the optimal grouping interval for high rate users depends on the Doppler shift of Rayleigh fading channel, the BERs of individual spreading gain are compared with those in the single rate system.