A code grouping interference cancellation receiver in OVSF DS-CDMA downlink

This paper presents the interference cancellation receiver for direct sequence code division multiple access (DS-CDMA) downlink channel with orthogonal variable spreading factor (OVSF) channelization code. The proposed receiver uses code grouping by the correlation property between OVSF mother and child codes. The proposed CGIC receiver does not requires the code information and activity of other user. The CGIC receiver has a lower computational complexity than other multiuser interference cancellation receivers. In the computer simulation results, the proposed receiver demonstrated huge performance improvement over the conventional matched filter receiver, RAKE receiver and serial interference cancellation (SIC) receiver in a multipath channel.