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The increase in the demand for voice and data wireless services creates a need for a more efficient use of the available bandwidth. Current and future generations cellular systems based on DS-CDMA are known to be interference-limited. Several approaches exist to mitigate the multiple access interference including MultiUser Detection (MUD). Group-based techniques have been proposed to reduce the complexity of the MUD and have been shown to provide a performance-complexity tradeoff between match filtering and full MUD. In this paper, the authors propose to reduce the Inter-Group Interference (IGI), a limiting factor in group-based systems, using linear Parallel Interference Cancellation (PIC). The complete equivalent matrix filter is derived and conditions for its convergence are discussed.
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