Inter-symbol interference (ISI):  
        MLSE (optimal but complex, e.g. equalization in GSM ).
          Equalization (e.g. DFE, LE).
         
        Multiple access interference (MAI): 
        Multiuser detection
        Power control
        Antenna arrays
         
        Co-channel interference (CCI): 
        Dynamic channel allocation.
        Notch filters.