Multi-user Detection / Interference Cancellation

• MLSE is too complex for practical DS-CDMA systems

• Most of the proposed detectors can be classified in one of the two categories: Linear Interference Cancellation (IC) or Subtractive IC

• Most promising scheme is Groupwise SIC (GSIC)

• Users grouped according to their SF; PIC or decorrelator is applied within the group. Their MAI is subtracted from the MF outputs of other users. This is done successively with higher SF groups.

• Users with lowest SF is subtracted from the MF outputs of the other users. This is done successive till the highest SF group

OptimalMLSE

Sub-optimal

Linear

Interferencecancellation

Multi-userreceivers

DecorrelatorMMSEMAI Whitening

PIC (WB, NB)SICDecision Feedback

MLSE - Maximum LikelihoodSequence EstimateMMSE - Minimum MeanSquare EstimateMAI - Multiple AccessInterferencePIC - Parallel Interference CancellationSIC - Successive Interference Cancellation

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