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The proposed a new method for signal recovery in multiuser multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system with knownpartial channel state information.The dispersive channelin multiuser MIMO_OFDM systemcan be seen as set ofinstantaneous mixtures for the perspective of frequency bin (FB),Whena new user arrives,the new interferences are introduced making an expanding mixture.Thechannel state information (CSI) is estimated with pilot symbols,recovering the transmittedsignals.However,if the new users CSI is known,it can be used to recover the transmittedsignals,instead of the bandwidth waste pilot symbols.In the proposed method,from thesecond order statistics of the received signals,the parameters of the mixture caused by newuser are extracted.Then the signals belong to different users are separated at each FB,wherethe new joint users signals still retain a phase distortion.This distortion can be removed bythe existing non-coherent detection method.The proposed method has proved effective incomputer simulations.